High pressure was located off the east coast and southerly flow increased dew points into the 70s for areas east of the Blue Ridge. A frontal boundary sagged southward and thunderstorms developed near it.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LWX wrote it up.
High pressure was located off the east coast and southerly flow increased dew points into the 70s for areas east of the Blue Ridge. A frontal boundary sagged southward and thunderstorms developed near it.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before the first event at Aug 10, 8:53 AM EST, 1 hour 56 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 953 AM EDT SAT AUG 10 2013 .SYNOPSIS... A COLD FRONT WILL STALL OVER THE REGION TODAY...AND REMAIN IN THE AREA THROUGH EARLY NEXT WEEK. A STRONGER COLD FRONT WILL SWEEP THROUGH THE MID-ATLANTIC ON TUESDAY. HIGH PRESSURE WILL BUILD IN FOR THE END OF THE WEEK. && .NEAR TERM /THROUGH TONIGHT/... COLD FRONT HAS JUST ABOUT STALLED IN THE VICINITY OF LOWER SOUTHERN MD WEST ACROSS CENTRAL VA. NORTH OF THIS BOUNDARY A MORE STABLE ENVIRONMENT WITH OVERCAST CONDITIONS REMAINS IN PLACE WITH DRIER AIR NOTED UPSTREAM INTO PA. SOUTH OF THE BOUNDARY...LOWER ATMOSPHERE IS MORE UNSTABLE. THINK FOCUS FOR CONVECTIVE ACTIVITY WILL BE SOUTH THIS AFTERNOON WITH MORE LIGHT RAIN EXPECTED NORTH. HAVE REMOVED THUNDER MENTION THROUGH EARLY AFTERNOON BUT REINTRODUCED THREAT FOR THUNDER IN THE 18-00Z TIMEFRAME GIVEN POTENTIAL FOR BREAKS IN THE OVERCAST. TEMPS A BIT TRICKY TODAY GIVEN OVERCAST NORTH AND BREAKS SOUTH. KEPT THINGS FAIRLY COOL UPPER 70S TO LOW 80S NORTH MID-UPPER 80S SOUTH. FOG WILL BE POSSIBLE OVERNIGHT WITH BREAKS IN THE CLOUD COVER EXPECTED. WILL CONTINUE PATCHY WORDING AND EVALUATE FURTHER FOR THE AFTERNOON PACKAGE. && .SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/... THE STALLED FRONTAL BOUNDARY OVER CENTRAL VA WILL BE MOVING NORTHWARD SUNDAY AFTERNOON AND EVENING AS A WARM FRONT. A PLUME OF MOISTURE WILL ENTER THE MID ATLANTIC WITH PWATS CLOSE TO 2 INCHES AND DEWPTS IN THE LOW 70S BY SUN AFTERNOON. SHOWERS AND SCATTERED THUNDERSTORMS WILL BE POSSIBLE THROUGHOUT THE DAY ESPECIALLY ALONG THE FROPA. LACK OF INSTABILITY AND SHEAR WILL LEAD TO WEAK THUNDERSTORMS BUT THEY WILL BE CAPABLE OF HEAVY RAIN. THIS ACTIVITY WILL MOVE EASTWARD INTO SUNDAY NIGHT. MID LEVEL DRY AIR WILL ENTER THE MID ATLANTIC BEHIND FROPA AS IT MOVES OFF THE ATLANTIC COAST. RADIATION FOG WILL BE POSSIBLE INTO MONDAY MORNING ESPECIALLY IF CLEARING OCCURS OVER AREAS THAT HAVE SEEN RAINFALL. ZONAL FLOW WILL PERSIST OVER THE MID ATLANTIC ON MONDAY. THE FROPA SHOULD BE OFF THE COAST LEADING TO A LESS HUMID DAY WITH PWAT VALUES NEAR 1.35IN AND LIGHT NW FLOW AT THE SFC. FLOW WILL QUICKLY TURN TO THE SOUTH TOWARDS MONDAY EVENING AND MOISTURE WILL START TO INCREASE ACROSS THE REGION. SHOWERS WILL BE POSSIBLE MAINLY ACROSS THE PIEDMONT AND MARINE ZONES AS OVERRUNNING TAKES PLACE AHEAD OF ANOTHER COLD FRONT THAT WILL APPROACH FROM THE GREAT LAKES REGION. && .LONG TERM /TUESDAY THROUGH FRIDAY/... A UPPER LEVEL TROUGH WILL APPROACH FROM THE NORTHWEST ON TUESDAY. A COLD FRONT WILL MOVE ACROSS THE OHIO VALLEY MONDAY NIGHT AND ENTER THE MTNS BY TUESDAY MORNING. THE MID ATLANTIC WILL BE IN THE WARM SECTOR AHEAD OF THE FRONT TUESDAY AND PWATS WILL INCREASE TO AROUND 2 INCHES...2+ INCHES NEAR THE PIEDMONT AND SOUTHERN MD. MULTIPLE SHORTWAVE TROUGHS WILL CROSS THE REGION AHEAD AND WITH THE FROPA. MARGINAL INSTABILITY AND SHEAR IS EXPECTED BUT ABUNDANT MOISTURE AND ADDED LIFT FROM FROPA AND UPPER LEVEL DYNAMICS WILL AID IN ISO-SCT THUNDERSTORM DEVELOPMENT. COLD FRONT CROSSES SOUTHERN MD BY WEDNESDAY MORNING AND NORTHWEST FLOW WILL TRANSPORT UPPER 50 DEWPTS TO THE MID ATLANTIC WEDNESDAY. HIGH PRESSURE WILL BUILD INTO THE MID ATLANTIC FOR THE END OF THE WORK WEEK. TEMPERATURES WILL BE NEAR OR SLIGHTLY BELOW NORMAL FOR THE LONG TERM. && .AVIATION /14Z SATURDAY THROUGH WEDNESDAY/... AREAS OF LIGHT RAIN AND OVERCAST CONDITIONS EXPECTED TODAY WITH THUNDER POTENTIAL POSSIBLE AT CHO. FOG POSSIBLE OVERNIGHT IF CLEARING COMMENCES. A WARM FRONT WILL MOVE NORTHWARD SUNDAY AND SHOWERS AND ISO-SCT THUNDERSTORMS ARE POSSIBLE. MVFR/IFR CONDITIONS ARE POSSIBLE WITHIN ACTIVITY. FOG WILL BE POSSIBLE SUNDAY NIGHT INTO MONDAY. ANOTHER COLD FRONT CROSSES THE REGION TUESDAY AND SHOWERS AND SCT THUNDERSTORMS ARE EXPECTED. && .MARINE... WITH A FRONT...ALBEIT A WEAK ONE...IN THE VICINITY...WINDS SHOULD BE LIGHT THROUGH TONIGHT. A WARM FRONT WILL MOVE NORTHWARD ACROSS THE WATERS SUNDAY. SHOWERS AND ISO THUNDERSTORMS ARE POSSIBLE. ANOTHER COLD FRONT WILL CROSS THE REGION TUESDAY. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && SYNOPSIS...KRW NEAR TERM...KRW SHORT TERM...HAS LONG TERM...HAS AVIATION...HAS/KRW MARINE...HAS/KRW
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 958 AM EDT SAT AUG 10 2013 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 111200- CHESAPEAKE BAY NORTH OF POOLES ISLAND MD- CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD- CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD- CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD- CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA- TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD- TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD- TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA- PATAPSCO RIVER INCLUDING BALTIMORE HARBOR- CHESTER RIVER TO QUEENSTOWN MD-EASTERN BAY- CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER- PATUXENT RIVER TO BROOMES ISLAND MD- TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-DISTRICT OF COLUMBIA-NORTHERN BALTIMORE-HARFORD- SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS- CALVERT-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX- ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA- KING GEORGE- 958 AM EDT SAT AUG 10 2013 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 ISOLATED THUNDERSTORMS WILL BE POSSIBLE INTO TONIGHT. SOME OF THE STORMS COULD PRODUCE HEAVY DOWNPOURS AND LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504- WVZ050>053-055-501>506-111200- WASHINGTON-FREDERICK MD-CARROLL-MONTGOMERY-HOWARD- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-AUGUSTA- ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-NELSON- ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-LOUDOUN-ORANGE-CULPEPER- NORTHERN FAUQUIER-SOUTHERN FAUQUIER-WESTERN HIGHLAND- EASTERN HIGHLAND-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-HARDY- WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL- WESTERN PENDLETON-EASTERN PENDLETON- 958 AM EDT SAT AUG 10 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN WEST VIRGINIA... NORTHERN AND CENTRAL VIRGINIA...AND CENTRAL AND WESTERN MARYLAND WITH THE EXCEPTION OF GARRETT COUNTY. .DAY ONE...TODAY AND TONIGHT SHOWERS AND ISOLATED THUNDERSTORMS TODAY WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL...WHICH COULD RESULT IN LOCALIZED FLASH FLOODING...MAINLY IN THE SOUTHERN SHENANDOAH VALLEY AND CENTRAL VIRGINIA FOOTHILLS. GUSTY WINDS ARE ALSO POSSIBLE IN THUNDERSTORMS IN THE SAME AREAS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The Sterling radar (KLWX), 139 km away, was scanning. The volume nearest the first event began at 15:49 UTC.
2 thunderstorm wind. Local standard time, as filed.
There was a tree down onto power lines along Route 20 south of Charlottesville.
There was a tree down blocking Rolling Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Virginia in 2013Every state in 2013This day in weather historyWarnings in Virginia, August 2013
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 473637, 473639.