Tornado Confirmed…hook echo on radar


Watch Video About Tornado's 'Hook'

PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 601 PM EST THU NOV 18 2010 ...NATIONAL WEATHER SERVICE CONFIRMS EF-1 TORNADO IN BALTIMORE CITY AND BALTIMORE COUNTY ON WEDNESDAY MORNING NOVEMBER 17 2010... LOCATION...HAMILTON IN BALTIMORE CITY AND PARKVILLE IN BALTIMORE COUNTY MARYLAND DATE...NOVEMBER 17 2010 ESTIMATED TIME...1:35 AM EST MAXIMUM EF-SCALE RATING...EF1 ESTIMATED MAXIMUM WIND SPEED...100 MPH MAXIMUM PATH WIDTH...250 YARDS PATH LENGTH...0.4 MILES BEGINNING LAT/LON...39.3665N / 76.5705W ENDING LAT/LON...39.3772N / 76.5601W * FATALITIES...NONE * INJURIES...3 MINOR * 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... AFTER AN EXTENSIVE REVIEW OF NATIONAL WEATHER SERVICE AND FEDERAL AVIATION ADMINISTRATION WEATHER RADARS... GROUND OBSERVATIONS... AN AERIAL SURVEY...AND EYEWITNESS ACCOUNTS...THE BALTIMORE/WASHINGTON WEATHER FORECAST OFFICE OF THE NATIONAL WEATHER SERVICE HAS DETERMINED THAT A TORNADO ESTIMATED AT A CATEGORY 1 ON THE ENHANCED FUJITA SCALE STRUCK NORTHEAST BALTIMORE DURING THE EARLY MORNING HOURS OF WEDNESDAY NOVEMBER 17TH...WITH ESTIMATED WIND SPEEDS FROM 85 TO 100 MPH. THE TORNADO WAS FORMED WITHIN A LINE OF THUNDERSTORMS WHICH SPANNED FROM PENNSYLVANIA TO NORTH CAROLINA ON WEDNESDAY MORNING NOVEMBER 17TH. THIS LINE OF THUNDERSTORMS WAS RACING TOWARDS THE NORTHEAST AT 70 MPH AS IT CROSSED THE BALTIMORE/WASHINGTON REGION. IT IS HYPOTHESIZED THAT A STRONG DOWNBURST OF WIND... ALSO KNOWN AS A REAR-INFLOW JET...DESCENDED FROM APPROXIMATELY ONE MILE HIGH IN THE ATMOSPHERE DOWN TO THE GROUND...AND BECAME COINCIDENT WITH THE LINE OF THUNDERSTORMS AS IT MOVED ACROSS THE CITY OF BALTIMORE. THIS STRONG DOWNBURST OF WIND CAUSED A BREAK IN THE LONG LINE OF THUNDERSTORMS AND CREATED TWO SEPARATE THUNDERSTORM LINE SEGMENTS. THE STRONG DOWNBURST OF WIND CONTINUED TO MODIFY THE THUNDERSTORMS... CREATING A SWIRLING WIND AT THE SOUTH END OF THE NEWLY FORMED NORTHERN SEGMENT. THE SWIRLING WIND IN THIS TYPE OF THUNDERSTORM SYSTEM IS OFTEN REFERRED TO AS A BOOKEND VORTEX...AND IT RESULTED IN THE GENERATION OF A BRIEF EF-1TORNADO. THE PATH OF WIND DAMAGE FROM THE THUNDERSTORMS THAT ALSO PRODUCED THE BRIEF TORNADO STARTED ON THE WESTERN EDGE OF MORGAN STATE UNIVERSITY IN NORTHEAST BALTIMORE CITY AND THEN CONTINUED FOR APPROXIMATELY 5 MILES TO THE NORTHEAST TO GUNPOWDER STATE PARK IN BALTIMORE COUNTY. IT SHOULD BE NOTED THAT THE VAST MAJORITY OF WIND DAMAGE ALONG THE 5 MILE LONG PATH WAS DUE TO STRAIGHT LINE WINDS FROM THE DESCENDING REAR-INFLOW JET AS IT HIT THE GROUND... REFERRED TO AS A MACROBURST. EMBEDDED WITHIN THE DAMAGE PATH OF THIS MACROBURST WERE TWO AREAS OF DAMAGE THAT ARE ASSOCIATED WITH THE EF-1 TORNADO. THE DAMAGE FROM THE EF-1 TORNADO WAS IN TWO SEPARATE AREAS A HALF MILE APART. THE FIRST AREA WAS ONE-TENTH OF A MILE LONG AND 175 YARDS WIDE THAT INCLUDED THE DUTCH VILLAGE APARTMENT COMPLEX. THREE OF THE UNITS HAD THEIR ROOFS BLOWN OFF. THE ROOFS WERE NOT CLIPPED TO THE STRUCTURES. THERE WAS EXTENSIVE TREE DAMAGE. SEVERAL CARS WERE SHIFTED BY THE FORCE OF THE WIND. THE TORNADO LIFTED BRIEFLY. THEN THE SECOND AREA...APPROXIMATELY A HALF MILE NORTH OF THE FIRST AREA...WAS ONE-THIRD OF A MILE LONG AND 250 YARDS WIDE...CENTERED ON THE PERRING PARKWAY SHOPPING CENTER IN PARKVILLE. EVIDENCE OF THE TORNADO INCLUDED RETAIL PROPERTY SURVEILLANCE CAMERAS WHICH SHOWED DEBRIS BLOWING IN DIFFERENT DIRECTIONS...TREES AND LIGHT POLES FALLING IN A CONVERGENT PATTERN...EYEWITNESS REPORTS...AND LEAF SPATTER ON ALL FOUR SIDES OF AUTOMOBILES AND STRUCTURES. WITH THE SPEED OF THE STORMS MEASURED AT 70 MPH... ALONG WITH A DAMAGE PATH OF 5 MILES FROM THE THUNDERSTORM...IT IS DETERMINED THAT IT TOOK ONLY 4 MINUTES FOR THE MACROBURST TO ACCOMPLISH ITS 5 MILE PATH OF DAMAGE. WITHIN THIS 4 MINUTE TIMEFRAME... THE EF-1 TORNADO WAS ON THE GROUND FOR LESS THAN 1 MINUTE. THE STORM PREDICTION CENTER IN NORMAN OKLAHOMA... IN CONJUNCTION WITH THE BALTIMORE/WASHINGTON WEATHER FORECAST OFFICE...ISSUED A SEVERE THUNDERSTORM WATCH FOR THE REGION AT 12:06 AM EST WEDNESDAY. A SEVERE THUNDERSTORM WATCH IS ISSUED WHEN CONDITIONS ARE FAVORABLE FOR DAMAGING THUNDERSTORMS. THIS ADVANCE NOTIFICATION WAS APPROXIMATELY 90 MINUTES PRIOR TO WHEN DAMAGE OCCURRED IN BALTIMORE CITY AND BALTIMORE COUNTY. THE BALTIMORE/WASHINGTON WEATHER FORECAST OFFICE ISSUED A SEVERE THUNDERSTORM WARNING FOR BALTIMORE CITY AND COUNTY AT 1:04 AM EST WEDNESDAY MORNING. A SEVERE THUNDERSTORM WARNING IS ISSUED WHEN WINDS OF GREATER THAN 58 MPH ARE EXPECTED. THIS WARNING PROVIDED APPROXIMATELY 32 MINUTES OF LEAD TIME PRIOR TO WHEN THE DAMAGE OCCURRED IN BALTIMORE CITY AND BALTIMORE COUNTY. RECEIVING LIFE SAVING WARNINGS AT NIGHT CAN BE ACHIEVED WITH A NOAA WEATHER RADIO...WHICH CAN BE SET TO ALARM ONLY FOR LIFE THREATENING WATCHES AND WARNINGS FOR YOUR PARTICULAR COUNTY. FOR MORE INFORMATION...VISIT WWW.WEATHER.GOV/NWR THE NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON WEATHER FORECAST OFFICE WOULD LIKE TO THANK THE BALTIMORE COUNTY OFFICE OF HOMELAND SECURITY AND EMERGENCY MANAGEMENT...THE BALTIMORE CITY MAYORS OFFICE OF EMERGENCY MANAGEMENT...THE BALTIMORE COUNTY POLICE DEPARTMENT... THE BALTIMORE CITY POLICE DEPARTMENT...AND THE MARYLAND EMERGENCY MANAGEMENT AGENCY FOR THEIR ASSISTANCE IN THE SURVEY. LEE/STRONG The EF Scale, which became operational on February 1, 2007, is used to assign a tornado a 'rating' based on estimated wind speeds and related damage. When tornado-related damage is surveyed, it is compared to a list of Damage Indicators (DIs) and Degrees of Damage (DoD) which help estimate better the range of wind speeds the tornado likely produced. From that, a rating (from EF0 to EF5) is assigned. The EF Scale was revised from the original Fujita Scale to reflect better examinations of tornado damage surveys so as to align wind speeds more closely with associated storm damage. The new scale has to do with how most structures are designed.

EF SCALE
EF Rating 3 Second Gust (mph)
0 65-85
1 86-110
2 111-135
3 136-165
4 166-200
5 Over 200

					
Advertisements

There are no comments on this post.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: