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Posted at 10:47 AM ET, 07/20/2012

Storms produce heavy rain, mainly in District to points north

Rainfall over the last 48 hours estimated by doppler radar. The heaviest rain fell mainly from the District to points north with downtown Baltimore receiving the highest totals. (National Weather Service)
A strong line of summer storms swept throught the metro region Thursday night, dumping 0.5-2” of rain from the south side of the beltway through Howard county. Lesser amounts fell south of the beltway while some areas around Baltimore received 3-4” (thanks to an additional storm earlier in the evening).

Severe thunderstorm warnings were issued, but no reports of wind damage or large hail were logged by NOAA’s Storm Prediction Center.

Comparison of wind velocities from derecho squall line of June 29 (left) with last night, July 19 (right). The bright pinks indicate much stronger winds during the derecho event. (RadarScope, adapted by Ian Livingston)
The hallmark of these storms were frequent lightning and the torrential rain rather than wind (maximum gusts were in the 40-50 mph range - below severe limits, 58 mph or more).

Officially, Reagan National Airport received 0.42”, Dulles 1.02” and BWI airport 0.86” Thursday.

The highest totals were observed in Baltimore city and Baltimore county. The Inner Harbor recorded 3.3” of rain, downtown Baltimore 3.27” and Parkville, in Baltimore county, 4.3”.

Watch this dramatic video of flooding near Fells Point. Note: it’s a VERY bad idea to drive through flood waters like this:

Here are some other impressive totals, all from Maryland:

Westminster: 2.78”
New Market: 3.15”
Glen Dale: 2.16”
Elkridge: 1.68”

Link: list of rainfall totals from National Weather Service

See below for some interesting radar images and photos from the storms of the last two nights. Allow a few seconds to load...

By  |  10:47 AM ET, 07/20/2012

Categories:  Latest, Local Climate, Thunderstorms

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