Archive for May, 2011

RECORD HEAT … UPDATE
May 31, 2011

The heat and humidity are turned up early this week and one record temperature in Baltimore has already been tied with another broken. The Monday high at BWI-Marshall reached 98° and on Tuesday it hit 97°.

The hottest temperatures will be early this week and the list below shows the records.

The Wednesday morning National Weather Service surface map for the eastern portion of the U.S. outlines a large area of high pressure over the east coast.

Unusually warm, humid air is bottled up under this ridge and the threat of more record temperatures will continue. A cold front to the west will eventually break the heat wave and the approaching front could trigger strong to severe storms.

The Northeast and Mid Atlantic regions have a slight risk for severe storms on Wednesday. The Storm Prediction Center has indicated that an enhanced risk for Severe Storms is likely over Central Maryland and Eastern Virginia Wednesday afternoon and evening.

The 1:30pm satellite image shows storm cells blossoming over Pennsylvania and that development should extend southward into Maryland, Virginia and West Virginia through the afternoon. There is a fairly high chance that some storm cells could produce damaging wind and hail.

Most of the southern and eastern U.S. will continue to experience the heat wave Wednesday. The map above shows the predicted high temperatures across the country. Note the the northwest will be rather cool. This has been the case much of this spring. That persistent pool of chilly air has been a major player in the severe weather that has plagued the central U.S. this spring.

Courtesy: National Weather Service

Again Wednesday a Heat Advisory is in effect over the central portion of Maryland as indicated by the orange shaded areas in the map above. The grey shaded areas indicate counties under an Air Quality alert. The Air Quality alert is also in effect for the Baltimore region and much of the area under the Heat Advisory.

Keep up with the latest on this heat wave and the potential for severe storms on wbaltv.com and check in with Tony and Tom for the latest forecasts on WBAL-TV 11.

(The Tuesday morning blog entry has been updated to include the latest information through Wednesday midday.)

John Collins

Advertisements

U.S. Tornado Statistics
May 26, 2011

The National Weather Service has released preliminary statistics for the deadly 2011 tornado season so far:  Tornado Stats.  The Joplin, MO tornado was upgraded to an EF-5 storm (highest on the scale), with winds estimated in excess of 200 mph.  The Joplin tornado now ranks as the single deadliest tornado in U.S. history since official National Weather Service statistics began in 1950; an estimated 123 people lost their lives in that tornado.  Sadly, two of the tornadoes from the April 27th outbreak in Alabama also rank in the top 7 deadliest tornadoes on record.

Tom Tasselmyer

Stormy Tuesday
May 24, 2011

It appears that Tuesday will be a very active weather day, especially across the southern Plains.

Locally, the summer-like conditions of heat and humidity and a weak trigger in the upper atmosphere will probably set of some scattered thunderstorm activity, some of which could be strong to severe.

The storm Prediction Center has tagged the Mid Atlantic region as having a slight risk for severe storms with about a 40% chance for scattered storm development.

The early morning visible satellite image above shows cloudiness along a boundary (front) to the northwest of the Mid Atlantic area and a decaying convective complex in eastern Kentucky. The air mass south of the front is warm and humid and primed for storm development if the right atmospheric triggers develop.

The biggest weather problems today will be in the southern Plains, specifically Oklahoma and Kansas where there is a high risk (70%) of severe storms.

The predawn National Weather Service surface map shows a low pressure center over the Texas panhandle with a cold front dropping south into west Texas. Ahead of that cold front is an orange line with semicircles on it. This is referred to a a “dryline” and is a boundary between dry air to the west and and very moist air to the east. Later in the day this “dryline” should provide a strong lifting mechanism to push the moist air into the upper atmosphere, resulting in severe thunderstorms.

The early morning visible satellite image shows the low clouds in the moist air ahead of the “dryline”.

Another indicator of a potential severe weather outbreak is the upper atmosphere winds.

The high altitude wind flow is outlined in the forecast map above for later this afternoon. The blue shaded areas indicate winds in the 70-10 knot range pushing into Texas and Oklahoma, the area where the “dryline” will be forcing moist air upward.

Yet another forecast map for late afternoon shows upper wind flow (wind barbs) and areas of maximum spin and upward motion (yellow) in the atmosphere. This lift and upward motion is referred to as vorticity. The vorticity maximum moving into the southern Plains adds an extra kick to all of the other things going on.

All of the factors above are forecast to converge on north Texas, Oklahoma and Kansas this afternoon and evening and it is quite possible that another serious outbreak of severe storms and tornados will occur.

Check out wbaltv.com for the latest developments locally and in the southern Plains. Tom Tasselmyer will keep you up to date this afternoon and evening on WBAL-TV 11.

John Collins

A Soggy Week
May 20, 2011

The Baltimore/Washington Forecast Office of The National Weather Service has tallied up the rainfall totals and the results show the week ending at 8:00am on Friday was quite soggy.  Most areas received 2-5″ of rain.  A partial list of reporting stations around the Baltimore/Washington area is posted below.  For additional precipitation reports check out this website:  http://www.cocorahs.org/ViewData/TotalPrecipSummary.aspx

Tom Tasselmyer

IN MARYLAND...
MD-BL-13 JACKSONVILLE1.5NE BALTIMORE    4.68
MD-HR-14 NORRISVILLE 0.2W  HARFORD      4.04
HREM2    ECHODALE AVE      BALT CITY    3.03
CLBM2    COLUMBIA          HOWARD       2.85
DAMM2    DAMASCUS 2        MONTGOMERY   2.75
THUM2    CATOCTIN MOUNTAIN FREDERICK MD 2.50
RVRM2    CHURCHTON         ANNE ARUNDEL 2.48
CVLM2    CEDARVILLE        PRNC GEORGES 2.40
ATHM2    SIMPSONVILLE      HOWARD       2.34
COOM2    COOKSVILLE        HOWARD       2.30
MOOM2    MORAVIA IND PARK  BALT CITY    2.21
BSLM2    BRISTOL           ANNE ARUNDEL 2.12
PIKM2    PIKESVILLE        BALTIMORE    2.08

16 Tornadoes!
May 5, 2011

Tornadoes Confirmed April 27-28, 2011

The National Weather Service has confirmed 5 more tornadoes from last week’s severe weather outbreak.  The total for April 27th and 28th in Maryland and Virginia now stands at 16; eight in Maryland and another eight in Virginia.  Most of the tornadoes were the weakest variety (EF-0) with winds of 65-85 mph, in fact 7 of the 8 that touched down in Maryland were EF-0 with the lone exception an EF-1 storm in St. Mary’s County.  The strongest tornado around here last week was the EF-2 storm that tracked over 30 miles through western Virginia from Fulk’s Run in Rockingham County to St. Luke in Shenandoah County.  The complete report on each tornado is posted below.

Tom Tasselmyer

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
900 PM EDT WED MAY 4 2011

...UPDATE TO ADD TORNADOES IN ALLEGANY...CALVERT AND MONTGOMERY
COUNTIES MD AND PRINCE WILLIAM COUNTY VA...

...SIXTEEN TORNADOES CONFIRMED DURING 27-28 APRIL THUNDERSTORMS...
...ADDITIONAL INVESTIGATIONS CONTINUE...

.........................MARYLAND..............................

...EF-0 TORNADO CONFIRMED NEAR TOWN CREEK MARYLAND...

LOCATION...2 MI NORTH OF TOWN CREEK IN ALLEGANY COUNTY MARYLAND
DATE...APRIL 28 2011
ESTIMATED TIME...1:27 AM TO 1:28 AM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...80 MPH
MAXIMUM PATH WIDTH...75 YARDS
LENGTH...0.5 MILES
BEGINNING LAT/LON...39.555N / 78.540W
ENDING LAT/LON...39.562N / 78.535W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

THE TORNADO BEGAN ON A WOODED HILLSIDE JUST SOUTH OF THE 23200 BLOCK
OF PACK HORSE ROAD. DAMAGE ALONG THE PATH LENGTH WAS LARGELY TO
TREES. NUMEROUS TREES WERE UPROOTED ALONG THE HILLSIDE. A LARGE
TREE THREE FEET IN DIAMETER PARTIALLY FELL ON A RESIDENCE ON PACK
HORSE RD...CAUSING DAMAGE TO ONE WALL AND A PORTION OF THE ROOF. THE
TORNADO DAMAGE EXTENDED NORTH FROM PACK HORSE ROAD INTO A WOODED
AREA EVIDENT BY MORE UPROOTED TREES. FARTHER ALONG THE PATH...DAMAGE
TO TREES OCCURRED BEHIND A RESIDENCE ON MANIFORD RD SE ADJACENT TO
THE BOUNDARY OF GREEN RIDGE STATE FOREST. AT THIS POINT THE DAMAGE
PATH ENDED. THE DAMAGE PATH EXTENDED INTO A HEAVILY FORESTED
INACCESSIBLE AREA THAT WAS NOT SURVEYED. THIS TORNADO HAS BEEN RATED
EF-0 WITH MAXIMUM WINDS ESTIMATED AT 80 MPH.

&&

...EF-0 TORNADO CONFIRMED IN GREEN RIDGE MARYLAND...

LOCATION...3 MI NORTHWEST OF GREEN RIDGE IN ALLEGANY COUNTY MARYLAND
DATE...APRIL 28 2011
ESTIMATED TIME...1:35 AM TO 1:35AM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...80 MPH
MAXIMUM PATH WIDTH...75 YARDS
LENGTH...0.1 MILES
BEGINNING LAT/LON...39.601N / 78.479W
ENDING LAT/LON...39.602N / 78.477W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A BRIEF TORNADO OCCURRED IN GREEN RIDGE STATE FOREST. DAMAGE WAS
FOUND ALONG A SWITCHBACK ON MERTENS RD BETWEEN STAFFORD AND EAST
VALLEY ROADS. NUMEROUS TREES WERE UPROOTED AND/OR TOPPED IN A SMALL
AREA OF MERTENS ROAD. TREE CANOPIES SHOWED EVIDENCE OF CONVERGENT
FLOW NEAR THE DAMAGE TRACK. THIS TORNADO HAS BEEN RATED EF-0 WITH
MAX WINDS ESTIMATED AT 80 MPH AND A WIDTH OF 75 YARDS. THE TOUCHDOWN
TIME IS BASED UPON RADAR. DUE TO THE REMOTE AND RUGGED NATURE OF THE
TERRAIN...THE DAMAGE TRACK COULD POSSIBLY EXTEND FARTHER ALONG
EITHER END OF THE PATH.

&&

...EF-0 TORNADO CONFIRMED NEAR HAMPSTEAD MARYLAND...

LOCATION...WESTERN BALTIMORE COUNTY...2 MILES EAST OF HAMPSTEAD
DATE...APRIL 28 2011
ESTIMATED TIME...8:09 AM TO 8:11 AM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...65 MPH
MAXIMUM PATH WIDTH...50 YARDS
LENGTH...1.1 MILES
BEGINNING LAT/LON...39.609N / 76.830W
ENDING LAT/LON...39.614N / 76.810W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY THE NATIONAL WEATHER SERVICE...TOGETHER
WITH RADAR AND EYEWITNESS REPORTS DETERMINED THAT AN EF-0 TORNADO
TRACKED FROM NEAR THE CARROLL COUNTY LINE IN BALTIMORE COUNTY ALONG
MT CARMEL ROAD FOR 1.1 MILES. THE TORNADO SNAPPED AND UPROOTED
SEVERAL TREES AND DOWNED LARGE BRANCHES. THE STORM TRACKED ACROSS
MARSHALL MILL ROAD.

&&

...EF-0 TORNADO CONFIRMED IN LUSBY MD...

LOCATION...LUSBY IN CALVERT COUNTY MD
DATE...APRIL 28 2011
ESTIMATED TIME...11:41 AM TO 11:43 PM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...70 MPH
MAXIMUM PATH WIDTH...50 YARDS
LENGTH...1.8 MILES
BEGINNING LAT/LON...38.366N / 76.465W
ENDING LAT/LON...38.380N / 76.439W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY THE NATIONAL WEATHER SERVICE...TOGETHER
WITH RADAR AND EYEWITNESS REPORTS DETERMINED THAT AN EF-0 TORNADO
TRACKED BRIEFLY FROM NEAR THE INTERSECTION OF HILLTOP ROAD AND
COSTER ROAD TO THE INTERSECTION OF SOLOMONS ISLAND ROAD AND
SWEETWATER ROAD. SIX INSTANCES OF DAMAGE WERE NOTED ALONG THE
PATH...INCLUDING APPROXIMATELY A DOZEN TREES THAT WERE UPROOTED...
ALONG WITH LARGE BRANCHES DOWNED.

&&

...EF-0 TORNADO CONFIRMED IN WESTMINSTER MARYLAND...

LOCATION...WESTMINSTER IN CARROLL COUNTY MD
DATE...APRIL 28 2011
ESTIMATED TIME...7:46 AM TO 7:47 AM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...65 MPH
MAXIMUM PATH WIDTH...50 YARDS
LENGTH...0.6 MILES
BEGINNING LAT/LON...39.568N / 76.988W
ENDING LAT/LON...39.577N / 76.984W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY THE NATIONAL WEATHER SERVICE...TOGETHER
WITH RADAR AND EYEWITNESS REPORTS DETERMINED THAT AN EF-0 TORNADO
TRACKED ACROSS EASTERN PORTIONS OF WESTMINSTER. THE TORNADO UPROOTED
AND SNAPPED SEVERAL TREES AND DOWNED LARGE BRANCHES. THE STORM
TRACKED FROM NEAR OLD WESTMINSTER PIKE ACROSS RALPH AND CENTER
STREETS BEFORE LIFTING AS IT CROSSED ROUTE 97.

&&

...EF-0 TORNADO CONFIRMED NEAR POOLESVILLE MARYLAND...

LOCATION...NORTH OF POOLESVILLE IN MONTGOMERY COUNTY MD
DATE...APRIL 28 2011
ESTIMATED TIME...6:45 AM TO 6:47 AM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...65 MPH
MAXIMUM PATH WIDTH...50 YARDS
LENGTH...0.8 MILES
BEGINNING LAT/LON...39.152N / 77.420W
ENDING LAT/LON...39.158N / 77.408W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...
A SHORT DAMAGE PATH NORTH OF POOLESVILLE MARYLAND WAS DETERMINED BY
NATIONAL WEATHER SERVICE GROUND SURVEY. SPOTTY TREE DAMAGE WAS
OBSERVED ALONG THE TRACK ON BEALLSVILLE ROAD...ELGIN ROAD AND
JERUSALEM ROAD. A TRAMPOLINE WAS LOFTED AND DEPOSITED ATOP A POWER
POLE...WITH ADJACENT DAMAGE TO A FENCE AND SMALL TREE.

&&

...EF-0 TORNADO CONFIRMED NEAR CAMP SPRINGS MD...

LOCATION...ANDREWS AFB AND CAMP SPRINGS IN PRINCE GEORGES COUNTY MD
DATE...APRIL 27 2011
ESTIMATED TIME...7:16 PM TO 7:17 PM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...70 MPH
MAXIMUM PATH WIDTH...100 YARDS
LENGTH...0.8 MILES
BEGINNING LAT/LON...38.810N / 76.902W
ENDING LAT/LON...38.813N / 76.889W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY THE NATIONAL WEATHER SERVICE...TOGETHER
WITH RADAR AND EYEWITNESS REPORTS DETERMINED THAT AN EF-0 TORNADO
TRACKED BRIEFLY FROM A WOODED AREA JUST SOUTHWEST OF THE
INTERSECTION OF AUTH ROAD AND ALLENTOWN ROAD ONTO ANDREWS AIR FORCE
BASE. NUMEROUS TREES WERE UPROOTED AND SNAPPED. THE TORNADO ALSO
PRODUCED SOME ROOFING AND SIDING DAMAGE.

&&

...EF-1 TORNADO CONFIRMED IN BRETON BAY MARYLAND...

LOCATION...BRETON BAY IN SAINT MARYS COUNTY MD
DATE...APRIL 28 2011
ESTIMATED TIME...11:25 AM TO 11:29 AM EDT
MAXIMUM EF-SCALE RATING...EF-1
MAXIMUM WIND SPEED...90 MPH
MAXIMUM PATH WIDTH...50 YARDS
LENGTH...3.3 MILES
BEGINNING LAT/LON...38.263N / 76.666W
ENDING LAT/LON...38.294N / 76.618W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY SAINT MARYS COUNTY EMERGENCY MANAGEMENT
AND THE NATIONAL WEATHER SERVICE...TOGETHER WITH RADAR AND
EYEWITNESS REPORTS DETERMINED THAT AN EF-1 TORNADO TRACKED ACROSS
BRETON BAY IN SAINT MARYS COUNTY MARYLAND. THE TORNADO SNAPPED AND
UPROOTED NUMEROUS LARGE TREES AND CAUSED SOME HOME ROOFING AND
SIDING DAMAGE. IT ALSO BLEW A CINDER BLOCK WALL OUT FROM A STORAGE
SHED AND DAMAGED ITS ROOF. THE TORNADO PASSED OVER CAMP CALVERT.

&&

.............................VIRGINIA..............................

...EF-1 TORNADO CONFIRMED NEAR STAUNTON VIRGINIA...

LOCATION...CHURCHVILLE IN AUGUSTA COUNTY VA
DATE...APRIL 28 2011
ESTIMATED TIME...2:31 AM TO 2:36 AM EDT
MAXIMUM EF-SCALE RATING...EF-1
MAXIMUM WIND SPEED...100 MPH
MAXIMUM PATH WIDTH...150 YARDS
LENGTH...4.0 MILES
BEGINNING LAT/LON...38.179N / 79.215W
ENDING LAT/LON...38.225N / 79.170W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY AUGUSTA COUNTY EMERGENCY MANAGEMENT AND
THE NATIONAL WEATHER SERVICE...TOGETHER WITH RADAR AND EYEWITNESS
REPORTS DETERMINED THAT AN EF-1 TORNADO TRACKED FROM CHRISTIAN TO
CHURCHVILLE VIRGINIA...5 MILES NORTHWEST OF STAUNTON. THE TORNADO
SNAPPED AND UPROOTED NUMEROUS LARGE TREES...DAMAGED SEVERAL HOMES...
REMOVED ROOFING ON MULTIPLE RESIDENCES AND DESTROYED SEVERAL
OUTBUILDINGS.

&&

...EF-0 TORNADO CONFIRMED IN RESTON VIRGINIA...

LOCATION...RESTON IN FAIRFAX COUNTY VIRGINIA
DATE...APRIL 27 2011
ESTIMATED TIME...11:25 PM TO 11:28 PM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...80 MPH
MAXIMUM PATH WIDTH...75 YARDS
LENGTH...1.1 MILES
BEGINNING LAT/LON...38.952N / 77.345W
ENDING LAT/LON...38.963N / 77.331W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

DAMAGE ALONG THE LENGTH OF THE PATH WAS PRIMARILY TO TREES. THE
TORNADO BEGAN IN A PARKING LOT ALONG SUNSET HILLS ROAD...WHERE SMALL
LIMBS WERE SNAPPED FROM A HARDWOOD TREE...AND A LARGE LIMB WAS
SNAPPED FROM A SOFTWOOD TREE. IT CROSSED SUNSET HILLS ROAD AND
ENTERED THE HIDDEN CREEK COUNTRY CLUB GOLF COURSE...WHERE IT
INTENSIFIED AND UPROOTED OR SNAPPED SEVERAL HARDWOOD AND SOFTWOOD
TREES. THE TORNADO WEAKENED SLIGHTLY AS IT CROSSED NORTH SHORE DRIVE
AND WEDGE ROAD...WHERE A FEW TREES WERE SNAPPED OR UPROOTED. A FEW
HOMES APPEARED TO SUFFER MINOR DAMAGE FROM FALLEN TREES. AS IT
CROSSED WIEHLE AVENUE...THE TORNADO INTENSIFIED AGAIN...SNAPPING OR
UPROOTING NUMEROUS TREES ADJACENT TO TALL OAKS VILLAGE CENTER BEFORE
WEAKENING RAPIDLY. THIS TORNADO HAS BEEN RATED EF-0. ADDITIONAL
REPORTED DAMAGE NORTHEAST OF THE LISTED END POINT WILL BE
EXAMINED...AND THIS REPORT MAY BE UPDATED.

&&

...EF-0 TORNADO CONFIRMED NEAR MIDDLETOWN VIRGINIA...

LOCATION...JUST NORTHEAST OF STRASBURG VA IN SHENANDOAH COUNTY TO
JUST NORTH OF MIDDLETOWN VA IN FREDERICK COUNTY
DATE...APRIL 28 2011
ESTIMATED TIME...3:45 AM TO 3:49 AM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...70 MPH
MAXIMUM PATH WIDTH...175 YARDS
LENGTH...4.3 MILES
BEGINNING LAT/LON...39.001N / 78.336W
ENDING LAT/LON...39.046N / 78.281W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY THE NATIONAL WEATHER SERVICE...TOGETHER
WITH RADAR AND EYEWITNESS REPORTS DETERMINED THAT AN EF-0 TORNADO
TRACKED FROM NORTHEAST OF STRASBURG TO THE WEST SIDE OF MIDDLETOWN.
THE TORNADO UPROOTED AND SNAPPED SEVERAL TREES..UNROOFED A POLE
BARN...AND REMOVED SEVERAL SHINGLES FROM A HOUSE. THE TORNADO
CROSSED INTERSTATE 81 AND ROUTE 11.

&&

...EF-0 TORNADO CONFIRMED SOUTHEAST OF TRIANGLE VA...

LOCATION...SOUTHEAST OF TRIANGLE VA NEAR THE STAFFORD COUNTY LINE
DATE...APRIL 27 2011
ESTIMATED TIME...6:16 PM TO 6:22 PM EDT
MAXIMUM EF-SCALE RATING...EF-0
MAXIMUM WIND SPEED...UNKNOWN
MAXIMUM PATH WIDTH...UNKNOWN
LENGTH...2.5 MILES
BEGINNING LAT/LON...38.519N / 77.335W
ENDING LAT/LON...38.539N / 78.296W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A TORNADO WAS OBSERVED BY A WEATHER OBSERVER AT QUANTICO AND WAS
SEEN BY SEVERAL OTHER OBSERVERS AT A DISTANCE. ALTHOUGH A FUNNEL
CLOUD WAS NOT IN CONTACT WITH THE GROUND DURING THE ENTIRE
TORNADO...DEBRIS WAS LOFTED AND CIRCULATED BENEATH A PENDANT FUNNEL
UNTIL IT DISSIPATED. THE PATH WAS DETERMINED BY TRIANGULATION FROM
MULTIPLE VANTAGE POINTS AND RADAR DATA. THE TORNADO WAS LOCATED IN
REMOTE WOODED PORTIONS OF QUANTICO AIR FORCE BASE...SO ANY POTENTIAL
DAMAGE INDICATORS WERE INACCESSIBLE. THE TORNADO IS ASSIGNED A
RATING OF EF-0 LACKING ANY DAMAGE REPORTS...BUT A MAXIMUM PATH WIDTH
AND WIND SPEED ARE INDETERMINATE PENDING ADDITIONAL INFORMATION.

&&

...EF-1 TORNADO CONFIRMED JUST WEST OF MANASSAS VIRGINIA...

LOCATION...NOKESVILLE AND BRISTOW IN PRINCE WILLIAM COUNTY VIRGINIA
DATE...APRIL 27 2011
ESTIMATED TIME... 10:47 PM EDT TO 11:01 PM EDT
MAXIMUM EF-SCALE RATING...EF-1
MAXIMUM WIND SPEED...90 MPH
MAXIMUM PATH WIDTH...125 YARDS
LENGTH...5.2 MILES
BEGINNING LAT/LON...38.667N / 77.584W
ENDING LAT/LON...38.735N / 77.547W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY THE NATIONAL WEATHER SERVICE...TOGETHER
WITH RADAR INFORMATION AND EYEWITNESS ACCOUNTS CONFIRMED THAT AN
EF-1 TORNADO TRACKED FROM THE CEDAR RUN PLANTATION AREA OF
NOKESVILLE TO BRISTOW...JUST WEST OF THE CITY OF MANASSAS. THE
TORNADO TOUCHED DOWN NEAR WARRENTON ROAD AND CARRIAGE FORD ROAD AND
PROCEEDED NORTHEASTWARD...WHERE IT SNAPPED OR UPROOTED NUMEROUS
TREES ALONG CARRIAGE FORD ROAD...ADEN ROAD AND GARMAN DRIVE. SIDING
AND SHINGLES WERE REMOVED FROM SEVERAL HOMES IN THIS AREA...AND
WINDOW SEALS WERE REMOVED ALONG A WEST-FACING WALL ON ONE HOUSE.
HORSE RUN-INS AND SHEDS ALSO WERE DAMAGED...AND GARAGE DOORS WERE
BLOWN IN ON A DETACHED GARAGE. THE CIRCULATION WEAKENED AS IT
CROSSED COLVIN LANE AND CURVED NORTHWARD THROUGH THE NEW BRISTOW
VILLAGE NEIGHBORHOOD AND INTO A SHOPPING CENTER PARKING AREA.
TREE...SHINGLE AND SIDING DAMAGE WAS NOTED IN THE NEIGHBORHOOD. THE
TORNADO DAMAGED A FENCE...SOME SIGNS AND SMALL TREES IN THE PARKING
LOT OF THE SHOPPING CENTER. THE FINAL DAMAGE OCCURRED AS THE TORNADO
CROSSED LINTON HALL ROAD AND SNAPPED A FEW TREES AS IT DIMINISHED.

&&

...EF-1 TORNADO CONFIRMED JUST NORTH OF HARRISONBURG VIRGINIA...

LOCATION...LINVILLE IN ROCKINGHAM COUNTY VA
DATE...APRIL 28 2011
ESTIMATED TIME...3:01 AM TO 3:02 AM EDT
MAXIMUM EF-SCALE RATING...EF-1
MAXIMUM WIND SPEED...90 MPH
MAXIMUM PATH WIDTH...50 YARDS
LENGTH...0.9 MILES
BEGINNING LAT/LON...38.502N / 78.838W
ENDING LAT/LON...38.511N / 78.827W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY THE NATIONAL WEATHER SERVICE...TOGETHER
WITH RADAR AND EYEWITNESS REPORTS DETERMINED THAT AN EF-1 TORNADO
TRACKED OVER A RURAL AREA NEAR LINVILLE VIRGINIA. OVER A TRACK THAT
WAS NEARLY A MILE LONG...THE TORNADO UPROOTED AND SNAPPED NUMEROUS
LARGE TREES ALONG A HORSE FARM AND SURROUNDING AREA. THE TORNADO
CROSSED IRISH PATH... INDIAN RIDGE LANE... AND MELROSE ROAD.

&&

...EF-1 TORNADO CONFIRMED JUST SOUTHEAST OF HARRISONBURG VIRGINIA...

LOCATION...KEEZLETOWN IN ROCKINGHAM COUNTY VA
DATE...APRIL 28 2011
ESTIMATED TIME...3:55 AM TO 3:58 AM EDT
MAXIMUM EF-SCALE RATING...EF-1
MAXIMUM WIND SPEED...90 MPH
MAXIMUM PATH WIDTH...150 YARDS
LENGTH...2.7 MILES
BEGINNING LAT/LON...38.388N / 78.865W
ENDING LAT/LON...38.416N / 78.832W
* FATALITIES...NONE
* INJURIES...NONE

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY THE NATIONAL WEATHER SERVICE...TOGETHER
WITH RADAR AND EYEWITNESS REPORTS DETERMINED THAT AN EF-1 TORNADO
TRACKED JUST SOUTHEAST OF THE CITY OF HARRISONBURG ALONG BOYER ROAD.
THE TORNADO TOUCHED DOWN ALONG OSCEOLA SPRINGS ROAD CAUSING TREE
DAMAGE...THEN PROCEEDED NORTHEAST TO BOYER ROAD. THE TORNADO
UPROOTED AND SNAPPED NUMEROUS LARGE TREES... UPROOTED MOST OF A
PERSONAL APPLE ORCHARD...CAUSED STRUCTURAL DAMAGE TO TWO HOMES BY
LIFTING THEIR ROOFS...DAMAGED TWO BARN ROOFS...KNOCKED DOWN
GRAVESTONES...DESTROYED A METAL SHED...AND MOVED A LIVESTOCK TRAILER
SEVERAL FEET. THE STORM CROSSED US ROUTE 33 AND LIFTED WHEN IT
REACHED THE RIDGE ADJACENT TO IT.

&&

...EF-2 TORNADO TRAVELS OVER 30 MILES IN THE SHENANDOAH VALLEY OF
VA...

LOCATION...FULKS RUN TO ST LUKE VIRGINIA IN ROCKINGHAM/SHENANDOAH
COUNTIES DATE...APRIL 28 2011
ESTIMATED TIME...2:12 AM TO 2:35 AM EDT
MAXIMUM EF-SCALE RATING...EF-2
MAXIMUM WIND SPEED...130 MPH
MAXIMUM PATH WIDTH...400 YARDS
LENGTH...33.2 MILES
BEGINNING LAT/LON...38.654N / 78.962W
ENDING LAT/LON...38.959N / 78.478W
* FATALITIES...NONE
* INJURIES...TWO

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT/S/ AND PUBLICATION IN NWS
STORM DATA.

...SUMMARY...

A GROUND SURVEY CONDUCTED BY THE NATIONAL WEATHER SERVICE...TOGETHER
WITH RADAR AND EYEWITNESS REPORTS DETERMINED THAT A TORNADO WITH
PEAK WINDS OF 130 MPH TRACKED FOR OVER 30 MILES ACROSS THE NORTHERN
SHENANDOAH VALLEY OF VIRGINIA. THE TORNADO TOUCHED DOWN NEAR FULKS
RUN VIRGINIA ALONG THE NORTH FORK OF THE SHENANDOAH RIVER AND
CREATED NEARLY CONTINUOUS DAMAGE ON ITS 33 MILE NORTHEAST PATH...NOT
LIFTING UNTIL IT GOT TO ST LUKE VIRGINIA JUST WEST OF WOODSTOCK.

ALONG ITS PATH...THE TORNADO TORE OFF ROOFS FROM BARNS AND HOMES...
SNAPPED AND UPROOTED HUNDREDS OF TREES...DECIMATED A MOBILE HOME...
PICKED UP A HALF TON PIECE OF INDUSTRIAL EQUIPMENT AND TOSSED IT 200
YARDS...AND DESTROYED NUMEROUS SHEDS.

THE WORST OF THE DAMAGE WAS JUST EAST OF ORKNEY SPRINGS...BASYE...
AND BRYCE RESORT. STARTING IN A REMOTE AREA...AND THEN MOVING ACROSS
ROUTE 263 INTO THE FORESTED SKI AND HUNT CLUB SUBDIVISION...AND THEN
INTO A FARMING COMMUNITY...THE TORNADO SNAPPED AND UPROOTED MOST OF
THE LARGE TREES IN THE FOREST WITHIN ITS PATH. IT THEN LEVELED AN
ENTIRE AGRICULTURAL CHICKEN BUILDING DOWN TO THE FOUNDATION...
DAMAGED OTHERS...FLIPPED A PICKUP TRUCK ON ITS SIDE AND THREW
SEVERAL TRAILERS.

TWO INJURIES WERE REPORTED...AN 82 YEAR OLD FEMALE FROM FLYING
DEBRIS AND A 26 YEAR OLD WOMAN WITH MINOR INJURIES FROM FALLING
WHILE ESCAPING.

&&

$$

NATIONAL WEATHER SERVICE
BALTIMORE/WASHINGTON FORECAST OFFICE