A cold front approached from the Ohio Valley. Showers and isolated thunderstorms moved across the unstable Mid-Atlantic.
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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.
A cold front approached from the Ohio Valley. Showers and isolated thunderstorms moved across the unstable Mid-Atlantic.
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 6, 8:51 AM EST, 5 hours 4 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 951 AM EDT WED AUG 6 2014 .SYNOPSIS... A COLD FRONT WILL PASS THROUGH THE AREA THIS AFTERNOON AND EVENING. HIGH PRESSURE WILL RETURN FOR THURSDAY BEFORE SHIFTING INTO NEW ENGLAND FRIDAY THROUGH THE WEEKEND. WAVES OF LOW PRESSURE WILL RIDE ALONG A BOUNDARY TO OUR SOUTH DURING THIS TIME...BRINGING UNSETTLED CONDITIONS. && .NEAR TERM /THROUGH THURSDAY/... SATELLITE AT 13Z SHOWS COPIOUS CLOUD COVER SPREADING ACROSS NRN MD...AND KLWX 88D DETECTS SHRA BENEATH THESE CLOUDS FROM MARTINSBURG WESTWARD...WITH SPOTTY SHOWERS FURTHER SW AS WELL. HI-RES MODELS HAVE A DECENT IDEA OF THE ACTIVITY BUT THE TIMING IS OFF BY A COUPLE HOURS. THIS RAISES QUESTIONS ABOUT THE WX EVOLUTION FOR THE REST OF THE DAY. NEAR THE MASON-DIXON LINE...CLOUD COVER IS PROBABLY GOING TO HANG TOUGH ALL DAY LONG...AND THIS WILL SIGNIFICANTLY LIMIT INSTABILITY. MAX TEMPS MAY BE LOWERED SHARPLY IN THAT AREA IF TRENDS CONTINUE. FURTHER SOUTH...THERE ARE BREAKS IN THE CLOUDS...AND A PRETTY PREVALENT BREAK NEAR CLARKSBURG WV THAT WILL PROGRADE INTO OUR AREA. EVEN FURTHER SOUTH...THERE ARE HARDLY ANY CLOUDS AT ALL...AND THIS IS THE AREA TO WATCH FOR CONVECTIVE DEVELOPMENT THIS AFTERNOON. SFC ANALYSIS SHOWS ONE BOUNDARY ALREADY TO THE SOUTH /HENCE THE ONGOING LIGHT NORTH WINDS/ WITH A REINFORCING FRONT TO THE N/W. THE MAIN VORT MAX/SHORTWAVE ACTUALLY DOES NOT PASS THROUGH UNTIL THIS EVENING. THE WRF-ARW SHOWS 1-2KJ/KG OF CAPE EARLY THIS EVENING...BUT OTHER MODELS HAVE ONLY 500-1000 J/KG. SHEAR DOES INCREASE THROUGH THE DAY SO IF THE HIGHER CAPE VALUES ARE REALIZED WITH MORE SUNSHINE...STRONG/SEVERE STORMS ARE POSSIBLE... WITH DAMAGING WIND THE THREAT. WILL LINGER POPS INTO THE LATE EVENING ACROSS THE SOUTHERN PORTION OF THE CWA ALONG THE COLD FRONT...BUT MID LEVEL DRYING FROM THE NORTH SHOULD PUSH FAR ENOUGH SOUTH WHERE CWA DRIES OUT BY MIDNIGHT. DRYING AND NORTHWEST WINDS SHOULD ALSO AMELIORATE FOG CONCERNS FOR MOST AREAS LATE TONIGHT. FRONT PUSHES DOWN INTO THE CAROLINAS ON THURSDAY...AS HIGH PRESSURE BUILDS IN FROM THE NORTH. IT WILL FEEL LESS HUMID AS DEWPOINTS ARE FORECAST TO DROP INTO THE LOWER TO MIDDLE 50S. EXPECT SOME AFTERNOON CUMULUS DEVELOPMENT...BUT CWA SHOULD BE DRY. && .SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY/... CANADIAN HIGH PRESSURE WILL REMAIN OVER THE REGION THURSDAY NIGHT...BRINGING DRY AND COMFORTABLY COOL CONDITIONS ALONG WITH LOW HUMIDITY. MIN TEMPS WILL RANGE FROM THE LOWER AND MIDDLE 50S ACROSS THE POTOMAC HIGHLANDS AND SHENANDOAH VALLEY TO THE MID AND UPPER 60S IN DOWNTOWN WASHINGTON AND BALTIMORE. A BOUNDARY WILL REMAIN STALLED TO OUR SOUTH ACROSS THE CAROLINAS FRIDAY WHILE LOW PRESSURE DEVELOPS OVER THE TENNESSEE VALLEY. HIGH PRESSURE WILL SHIFT INTO NEW ENGLAND...BUT THE SURFACE RIDGE AXIS WILL REMAIN OVERHEAD. WARM AND MOIST AIR WILL BEGIN TO OVERRUN THE RELATIVELY COOLER AIR IN PLACE FOR FRIDAY RESULTING IN MORE CLOUDS...MAINLY ACROSS THE SOUTHWESTERN PORTION OF THE CWA. A FEW SHOWERS CANNOT BE RULED OUT ACROSS CENTRAL VIRGINIA INTO THE POTOMAC HIGHLANDS...BUT EVEN ACROSS THESE AREAS ANY RAINFALL THAT DOES OCCUR WILL BE LIGHT. ELSEWHERE...DRY CONDITIONS ARE EXPECTED AND THERE SHOULD BE SUNSHINE AS WELL. MAX TEMPS WILL RANGE FROM THE UPPER 70S TO NEAR 80 ACROSS THE CENTRAL SHENANDOAH VALLEY WHERE MORE CLOUD COVER IS EXPECTED TO THE MIDDLE 80S IN WASHINGTON AND BALTIMORE. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... HIGH PRESSURE OVER NEW ENGLAND WILL CONTINUE TO WEDGE INTO THE MID-ATLANTIC THROUGH SATURDAY. LOW PRESSURE OVER THE TENNESSEE VALLEY FRIDAY NIGHT WILL PASS BY TO OUR SOUTH SATURDAY. THE EXACT DETAILS ARE UNCERTAIN AT THIS TIME...BUT IT DOES APPEAR THAT CLOUDS WILL INCREASE ACROSS MOST AREAS DUE TO WARM AND MOIST AIR OVERRUNNING THE RELATIVELY COOLER AIR IN PLACE. THE BEST LIFT WILL BE CLOSER TO THE LOW...ACROSS CENTRAL VIRGINIA SO THIS IS WHERE THE BEST CHANCE FOR PRECIPITATION WILL BE. HOWEVER...THE GRADIENT BETWEEN WIDESPREAD SHOWERS AND LITTLE TO NO PRECIPITATION WILL LIKELY BE OVER OUR CWA. ANY SHIFT IN THE GRADIENT WILL HAVE A SIGNIFICANT IMPACT ON THE FORECAST. MAX TEMPS WILL BE COOLER SATURDAY DUE TO MORE CLOUD COVER. MAX TEMPS WILL RANGE FROM THE 60S AND 70S ACROSS CENTRAL VIRGINIA TO THE LOWER 80S IN WASHINGTON AND BALTIMORE. THE BOUNDARY MAY RETURN NORTH AS A WARM FRONT SUNDAY INTO EARLY NEXT WEEK...BRINGING MORE UNSETTLED CONDITIONS. && .AVIATION /14Z WEDNESDAY THROUGH SUNDAY/... SCTD SHRA AT KMRB THIS MORNING...WITH SHRA/TSRA POSSIBLE EVERYWHERE LATER IN THE DAY. WILL SPEED UP THE TIMING A BIT TO THE LATE AFTERNOON HOURS. DRIER AIR COULD BE FILTERING IN BEFORE SUNSET. REINFORCING WIND SHIFT OCCURS WITH A COLD FRONT PASSAGE BY THIS EVENING...DRIER AIR MOVING IN LIKELY PREVENTS FOG FORMATION FOR LATE TONIGHT. VFR THURSDAY WITH SCT CU WITH BASES AROUND 5K FT. VFR CONDITIONS ARE EXPECTED THURSDAY NIGHT THROUGH FRIDAY ALONG WITH LIGHT WINDS. LOW PRESSURE WILL PASS BY TO THE SOUTH ALONG A STALLED BOUNDARY FRIDAY NIGHT THROUGH SATURDAY...BRINGING MORE CLOUDS TO THE AREA. VFR CONDITIONS WILL LIKELY PERSIST ACROSS MOST OF THE TERMINALS AND ANY RAINFALL WILL BE LIGHT. HOWEVER...THERE IS A CHANCE FOR SUBVFR CONDITIONS...ESPECIALLY ACROSS KCHO. A BOUNDARY WILL REMAIN STALLED TO OUR SOUTH SUNDAY AND MONDAY. ANOTHER WAVE OF LOW PRESSURE MAY BRING UNSETTLED CONDITIONS. && .MARINE... WEAK PRESSURE FIELD/GRADIENT CONTINUES THROUGH MUCH OF THE DAY...WITH MAINLY W/NW WINDS 10 KT OR LESS. AFTERNOON/EVENING THUNDERSTORMS MAY PRODUCE STRONG WIND GUSTS...THEN NW WINDS WILL BE REINFORCED BEHIND A COLD FRONT FOR THE OVERNIGHT. IT/S POSSIBLE THAT A SCA MAY EVENTUALLY BE NEEDED FOR A NW SURGE LATE TONIGHT/THURSDAY MORNING HOWEVER CONFIDENCE IN OCCURRENCE IS LOW ATTM. A BOUNDARY WILL REMAIN STALLED TO OUR SOUTH THROUGH THE WEEKEND. HIGH PRESSURE WILL SHIFT INTO NEW ENGLAND...BUT THE RIDGE AXIS WILL CONTINUE TO EXTEND SOUTH INTO THE WATERS. WAVES OF LOW PRESSURE WILL PASS BY TO OUR SOUTH...BUT THE GRADIENT SHOULD BE WEAK ENOUGH FOR WINDS TO REMAIN BELOW SCA CRITERIA. THE BOUNDARY MAY APPROACH THE WATERS AS A WARM FRONT EARLY NEXT WEEK. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && SYNOPSIS...BJL NEAR TERM...JE/BPP SHORT TERM...BJL LONG TERM...BJL AVIATION...JE/BPP/BJL MARINE...BPP/BJL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 130 PM EDT WED AUG 6 2014 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 071000- 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- 130 PM EDT WED AUG 6 2014 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 SCATTERED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EVENING. A FEW THUNDERSTORMS WILL BE CAPABLE OF PRODUCING LOCALLY DAMAGING WIND GUSTS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING. MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504- WVZ050>053-055-501>506-071000- 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- 130 PM EDT WED AUG 6 2014 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 SCATTERED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EVENING. A FEW THUNDERSTORMS WILL BE CAPABLE OF PRODUCING LOCALLY DAMAGING WIND GUSTS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.
The Sterling radar (KLWX), 75 km away, was scanning. The volume nearest the first event began at 18:56 UTC.
1 thunderstorm wind. Local standard time, as filed.
There were several large trees down and one was on a house.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Virginia in 2014Every state in 2014This day in weather historyWarnings in Virginia, August 2014
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: 540085.