The unusual blocking pattern continues to bring extremes across the US. This time it’s in the form of rainfall with weekend flooding across parts of the Carolinas.

Thanks to the passing of an unusually strong summer low through the Great Lakes, extreme rain and flash flooding struck the Detroit, MI area yesterday. How significant? An all-time record rainfall for August and second biggest 24 hour rain on record.

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From NWS Detroit

A historic rainfall event unfolded over Southeast Michigan on Monday, August 11, leading to significant flooding and major road closures.  This event was caused by a low pressure system moving over the area and with the atmosphere being very moist created the heavy, continuous rains that were seen.  The hardest hit areas included Metro Detroit and surrounding communities, along with Flint and the Saginaw Valley areas.  Wayne, Southern Oakland and Macomb counties saw the worst of the flooding as 4 to 6 inches of rain fell over a 4 hour period.

DC-Baltimore’s turn today!

It happened again today, this time around the DC-Baltimore area and some may argue an even BIGGER event…

10 Inches Locally

From Capitol Weather Gang (Washington Post)

Record-breaking rainfall

As of 5 p.m., 6.27 inches of rain had fallen at Baltimore-Washington International. The location blew past its record for the day (which was 4.91 inches in 1955), and has now moved into second place for wettest day on record. The wettest day on record at BWI was August 23, 1933, when 7.62 inches of rain fell.

Radar rainfall estimates show that upwards of eight inches of rain fell in northern Anne Arundel County this afternoon, and some local personal weather stations confirm that estimate. Reagan National has logged 1.6 inches of rain so far today, and Dulles has picked up just over an inch. The second hardest hit area is a swath through southern Prince George’s and Anne Arundel counties, where radar estimates are totaling four to six inches.

Extreme Pattern

Here’s the upper pattern supporting the extreme rains in the Carolinas, Detroit and Baltimore-Washington.

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Tags: baltimore flooding, dc flooding, detroit flooding, detroit record rain, record rainfall