Big Time Rain & Tropical Storm Gert

Big rainmaking weather systems in August tend to come from the remnants of tropical weather systems, if not the storms themselves. The heavy rainfall this weekend came from a “regular” storm moving in from the west.

Storm cells associated with the system were slow moving and the atmosphere was loaded with moisture. The results were impressive, at least for some locations.

Over Saturday and Sunday BWI-Marshall Airport received a total of  1.47 inches of rain.  2.74 inches was measured at the Maryland Science Center. These are generous numbers for August but not necessarily spectacular.

The National Weather Service radar image above displays the estimated rainfall for Saturday and Sunday for the area. It’s a little busy but once you find Maryland and Baltimore(white state lines and city identifiers and black county lines), the red and yellow areas in northeast Maryland jump out of the picture. Up to around 10 inches of rain was measured in this area. The green shaded areas reaching westward from Baltimore received around 2 inches of rain.

Some of our viewers checked in with some impressive numbers:

11.75″    Earleville (Cecil County)

5.74″      Elkton

4.60″      Galena

2.25″       Windsor Mill

The following are reports from the National Weather Service.

PUBLIC INFORMATION STATEMENT
SPOTTER REPORTS
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
328 PM EDT SUN AUG 14 2011

THE FOLLOWING ARE UNOFFICIAL OBSERVATIONS TAKEN DURING THE PAST
31 HOURS FOR THE STORM THAT HAS BEEN AFFECTING OUR REGION.
APPRECIATION IS EXTENDED TO HIGHWAY DEPARTMENTS...COOPERATIVE
OBSERVERS...SKYWARN SPOTTERS AND MEDIA FOR THESE REPORTS.  THIS
SUMMARY IS ALSO AVAILABLE ON OUR HOME PAGE AT WEATHER.GOV/BALTIMORE

********************STORM TOTAL RAINFALL********************

LOCATION          STORM TOTAL     TIME/DATE   COMMENTS
                     RAINFALL           OF
                     /INCHES/   MEASUREMENT

MARYLAND

...ANNE ARUNDEL COUNTY...
   1 NNW PAROLE          3.00   300 AM  8/14  TRAINED SPOTTER
   1 N BALT-WASH INTL A  0.87   700 AM  8/14  ASOS

...BALTIMORE COUNTY...
   PARKVILLE             3.75  1220 PM  8/14  TRAINED SPOTTER
   1 NNE ROSEDALE        2.38   730 AM  8/14  TRAINED SPOTTER
   1 ENE CATONSVILLE     1.57  1224 PM  8/14  SINCE 8AM SUN MORNING
   1 E OELLA             1.00   900 AM  8/14  TRAINED SPOTTER

...BALTIMORE CITY...
   PIMLICO               2.47  1039 AM  8/14  SINCE 850AM SUN MORNING

...CALVERT COUNTY...
   2 N HUNTINGTOWN       2.00   130 PM  8/14  NWS EMPLOYEE

...HARFORD COUNTY...
   PLEASANT HILLS        3.06  1144 AM  8/14  TRAINED SPOTTER
   2 ENE DARLINGTON      1.05   800 AM  8/14  CO-OP OBSERVER

...PRINCE GEORGES COUNTY...
   3 SE MARLTON          2.19   800 AM  8/14  TRAINED SPOTTER
   1 SSE FOREST HEIGHTS  0.87   730 AM  8/14  CO-OP OBSERVER

PUBLIC INFORMATION STATEMENT
SPOTTER REPORTS
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
924 PM EDT SUN AUG 14 2011

THE FOLLOWING ARE UNOFFICIAL OBSERVATIONS TAKEN DURING THE PAST 12 HOURS
FOR THE STORM THAT HAS BEEN AFFECTING OUR REGION.  APPRECIATION IS EXTENDED
TO HIGHWAY DEPARTMENTS...COOPERATIVE OBSERVERS...SKYWARN SPOTTERS
AND MEDIA FOR THESE REPORTS.  THIS SUMMARY IS ALSO AVAILABLE ON OUR
HOME PAGE AT WEATHER.GOV/PHI

********************STORM TOTAL RAINFALL********************

LOCATION          STORM TOTAL     TIME/DATE   COMMENTS
                     RAINFALL           OF
                     /INCHES/   MEASUREMENT

DELAWARE

...NEW CASTLE COUNTY...
   BEAR                  6.32   700 PM  8/14
   MIDDLETOWN            6.00  1250 PM  8/14
   NEWARK                5.46   153 PM  8/14
   WILMINGTON AIRPORT    3.17   530 PM  8/14

...SUSSEX COUNTY...
   DELMAR                1.71   555 PM  8/14
   GEORGETOWN AIRPORT    1.14   530 PM  8/14

MARYLAND

...KENT COUNTY...
   MILLINGTON            7.30   900 AM  8/14

On Monday morning the storm system was along the coast and is forecast to move toward Cape Cod.

Courtesy: NOAA/National Weather Service

The early morning satellite image below shows the scope of the storm. The Mid Atlantic region will be in the backwash of the storm as it pulls to the northeast and shower and thunderstorm chances will linger into early Tuesday. Because of the saturated ground, flash flooding could be a problem in some areas.

The satellite image above also includes a shot of Tropical Storm Gert along the right edge. A closer image is below.

Gert was roughly 100 miles east of Bermuda this morning with winds clocked at 60 mph. Gert was expected to track well east of the island and tropical storm warnings have been dropped.

John Collins

 

 


 

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