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NWS Warns Of Severe Storms, Flooding Tonight And Thursday

by Aaron Kraut — June 12, 2013 at 12:20 pm 562 0

UPDATED 4:20 p.m. The National Weather Service has issued a Hazardous Weather Outlook for Wednesday and Thursday because of showers and thunderstorms that could produce high winds, flash flooding and other severe effects.

NWS also says already saturated ground from storms on Monday could lead to flooding in low-lying areas with just an inch of rain. It has issued a Flash Flood Warning, which you can read after the jump.

Some are sounding the derecho alarm to describe what’s possible for this batch of storms, though many forecasters say the risk of that is low in the D.C. area. What could strengthen the storm system is a cold front rare for mid-June.

Forecasts show storms rolling into the area this evening and last into early Thursday morning. Here’s the announcement from NWS:

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MARYLAND PORTION OF THE CHESAPEAKE BAY…TIDAL POTOMAC RIVER…AND ADJACENT COUNTIES IN CENTRAL MARYLAND AND NORTHERN VIRGINIA AS WELL AS THE DISTRICT OF COLUMBIA.

.DAY ONE…TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE AFTERNOON AND TONIGHT. SOME OF THESE STORMS WILL BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND LARGE HAIL. LOCALIZED FLASH FLOODING IS ALSO POSSIBLE.

.DAYS TWO THROUGH SEVEN…THURSDAY THROUGH TUESDAY

THUNDERSTORMS ARE EXPECTED THURSDAY. THERE IS THE POTENTIAL FOR A SIGNIFICANT SEVERE WEATHER EVENT…WITH THUNDERSTORMS PRODUCING DAMAGING WINDS…LARGE HAIL AND TORNADOES.

IN ADDITION…HEAVY RAINFALL MAY LEAD TO FLASH FLOODING IN SOME AREAS ON THURSDAY.

STRONG WIND GUSTS OF 40 TO 50 MPH MAY BE POSSIBLE BEHIND A COLD FRONT THURSDAY NIGHT.

A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE TIDAL POTOMAC RIVER AND MARYLAND CHESAPEAKE BAY THURSDAY AFTERNOON. A GALE WARNING MAY BE NECESSARY THURSDAY NIGHT…WITH SMALL CRAFT ADVISORY CONDITIONS LIKELY CONTINUING INTO FRIDAY.

SPOTTER INFORMATION STATEMENT…

SPOTTER ACTIVATION COULD BE NECESSARY THIS AFTERNOON AND TONIGHT…AND WILL ALSO LIKELY BE NEEDED ON THURSDAY.

Both Montgomery County and Pepco have provided tips for preparing for a severe storm that could lead to power outages. Pepco also has a video (above) describing the power restoration process.

The Flash Flood Warning is in effect for the entire D.C. area. About one to two inches is expected with this batch of storms:

… FLASH FLOOD WATCH IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH THURSDAY EVENING…

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WATCH FOR PORTIONS OF MARYLAND… THE DISTRICT OF COLUMBIA AND VIRGINIA… INCLUDING THE FOLLOWING AREAS… IN MARYLAND… ANNE ARUNDEL… CALVERT… CARROLL… CHARLES… FREDERICK MD… HARFORD… HOWARD… MONTGOMERY… NORTHERN BALTIMORE… PRINCE GEORGES… SOUTHERN BALTIMORE AND ST. MARYS. THE DISTRICT OF COLUMBIA. IN VIRGINIA… ARLINGTON/FALLS CHURCH/ALEXANDRIA… CULPEPER… FAIRFAX… GREENE… KING GEORGE… LOUDOUN… MADISON… NORTHERN FAUQUIER… ORANGE… PRINCE WILLIAM/MANASSAS/MANASSAS PARK… RAPPAHANNOCK… SOUTHERN FAUQUIER… SPOTSYLVANIA AND STAFFORD.

* FROM MIDNIGHT EDT TONIGHT THROUGH THURSDAY EVENING

* SHOWERS AND THUNDERSTORMS WILL LIKELY MOVE ACROSS THE REGION TONIGHT AND PRODUCE HEAVY DOWNPOURS. RAINFALL AMOUNTS IN EXCESS OF 1 INCH ARE POSSIBLE LATE TONIGHT. ANOTHER ROUND OF STORMS MAY BRING HEAVY RAIN ON THURSDAY WITH AN ADDITIONAL 1 TO 2 INCHES POSSIBLE.

* WITH THE GROUND ALREADY SATURATED FROM HEAVY RAINFALL DURING THE PAST WEEK… ONLY AN INCH OF RAINFALL IN AN HOUR COULD PRODUCE FLASH FLOODING OF STREAMS AND LOW LYING AREAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION.

YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED.

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