A disturbance moved off the Mid-Atlantic coast while clouds dissipated behind it. Clearing led to radiational cooling and dense fog formed in valley locations in Northern Virginia.
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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 disturbance moved off the Mid-Atlantic coast while clouds dissipated behind it. Clearing led to radiational cooling and dense fog formed in valley locations in Northern Virginia.
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 5, 7:36 PM EST, 3 hours 39 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 836 PM EDT TUE AUG 5 2014 .SYNOPSIS... A COLD FRONT OVER NORTHERN PENNSYLAVNIA WILL PASS THROUGH THE AREA WEDNESDAY. HIGH PRESSURE WILL BUILD OVER THE NORTHEASTERN STATES FOR THE END OF THE WEEK THROUGH THE UPCOMING WEEKEND. SHOWERS OR THUNDERSTORMS WILL STILL BE POSSIBLE OVER THE WEEKEND...AS WEAK DISTURBANCES MAY CAUSE AN UNSETTLED WEATHER PATTERN. && .NEAR TERM /THROUGH WEDNESDAY/... KEEPING AN EYE ON THE LN OF STORMS JUST N OF THE MASON-DIXON LN. AT THIS TIME THESE DO NOT APPEAR SVR. POPS CONFINED TO RIGHT ALONG THE MASON-DIXON LINE AND IN THE HIGHLANDS. MOST LIKELY THE URBAN CORRIDOR WILL BE DRY. LOWS IN THE 60S...XCPT L70S IN THE CITIES. && .SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/... WITH A LACK OF FORCING...AN APPROACHING COLD FRONT WILL LIKELY STALL NORTH OF THE AREA TONIGHT...AND AWAIT A STRONGER SHORTWAVE ASSOCIATED WITH THE LONGWAVE TROUGH AXIS...WHICH WILL PASS THROUGH THE REGION ON WEDNESDAY. FRONTAL FORCING AND THE UPPER SHORTWAVE WILL SPARK SOME CONVECTION...BUT I THINK COVERAGE IS IN QUESTION...AND I DO NOT EXPECT ANYTHING TOO ROBUST. WILL KEEP CHANCE /30 TO 40/ POPS...HIGHEST CLOSER TO THE TROUGH ALONG THE MASON-DIXON LINE. BUT IT WOULD NOT SURPRISE ME TO SEE A LOT OF AREAS STAY COMPLETELY DRY. HIGH TEMPS WILL DEPEND ON HOW QUICKLY THE FRONT MOVES THROUGH. I TEND TO LEAN TOWARD SLOWER PROGRESSION...ESPECIALLY GIVEN THIS SETUP...SO I WENT ON THE WARMER SIDE OF GUIDANCE. COLD FRONT SHOULD BE THROUGH THE AREA BY THE EVENING ON WEDNESDAY... WITH COOLER AND LESS HUMID AIR SLOWLY FILTERING IN WEDNESDAY NIGHT AND THURSDAY. THURSDAY WILL BE A DRY DAY WITH A NORTHERLY BREEZE AND THURSDAY NIGHT WILL BE COMFORTABLY COOL. THE FORECAST STARTS TO BECOME MURKY ON FRIDAY. THE FRONT WILL BE STALLED WELL TO OUR SOUTH WITH THE SFC HIGH IN NEW ENGLAND. WEAK SHORTWAVES WILL BE PROGRESSING THROUGH LARGELY ZONAL FLOW...WITH MOISTURE RETURNING ALOFT...ESPECIALLY IN SOUTHERN PORTIONS OF THE FORECAST AREA. THIS COMBINATION MAY SPARK SOME SHRA/TSRA AS EARLY AS MIDDAY FRIDAY IN OUR SWRN COUNTIES...AND LOW POPS WERE RETAINED DURING THIS TIME. HIGHS BELOW NORMAL WITH LOW HUMIDITY EXCEPT POTENTIALLY IN THAT SWRN PORTION OF THE AREA. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... WEDGE OF HIGH PRESSURE WILL BUILD SOUTHWARD FRIDAY AND REMAIN IN PLACE THROUGH THE PERIOD. A QUASI-STATIONARY BOUNDARY ACROSS SOUTHWEST VIRGINIA/CENTRAL NORTH CAROLINA ALONG WITH OROGRAPHIC LIFTING...OVERRUNNING AND WEAK PVA WILL INCREASE THE CHANCE OF SHOWERS IN THE CWA STARTING FRIDAY NIGHT. A SERIES OF WAVES ALONG THE STALLED BOUNDARY WILL ADD THUNDERSTORMS TO THE MIX DURING THE AFTERNOON/EVENING SATURDAY THROUGH TUESDAY. WORTH NOTING...THE 12Z ECMWF KEEPS MOST OF THE PRECIP SOUTH OF THE AREA...SO THIS WILL CONTINUE TO BE MONITORED. && .AVIATION /00Z WEDNESDAY THROUGH SUNDAY/... VFR EXPECTED THROUGH THE VALID TAF PERIOD. CHANCE OF SHRA/TSRA CONTINUES ON WEDNESDAY BUT CONFIDENCE IN OCCURRENCE IS LOW GIVEN MEAGER INSTABILITY AND MOISTURE. IF A SHRA/TSRA MOVES OVER A TERMINAL...BRIEF VSBY RESTRICTIONS ARE POSSIBLE. COLD FRONT MOVES THROUGH ALL TERMINALS BY WEDNESDAY EVENING...WITH A DECENT NORTH BREEZE EXPECTED BEHIND THE FRONT ON THURSDAY. SHRA/TSRA CANNOT BE RULED OUT INVOF KCHO ON FRIDAY...AND THERE IS A CHANCE OF SHRA/TSRA AREAWIDE OVER THE WEEKEND DURING A POTENTIALLY UNSETTLED PATTERN. && .MARINE... NO MARINE CONCERNS IN THE SHORT TERM. SHRA/TSRA CHANCES INCREASING AFTER NOON WEDNESDAY. COLD FRONT MOVES THROUGH THE WATERS BY WEDNESDAY EVENING. SOME NORTHERLY GUSTS NEAR 20 KTS ARE POSSIBLE THURSDAY IN THE WAKE OF THE FRONT...AND A SCA MAY BE NEEDED FOR PORTIONS OF THE BAY. WINDS THEN SLACKEN AGAIN AS HIGH PRESSURE BUILDS IN FOR THE END OF THE WEEK AND WEEKEND. SOME SHRA/TSRA ARE POSSIBLE OVER THE WEEKEND BUT CHANCES ARE LOW AT THIS TIME. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && UPDATE...WOODY! PRVS...JCE/CEM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1025 PM EDT TUE AUG 5 2014 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 061530- 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- 1025 PM EDT TUE AUG 5 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...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS MAY DEVELOP WEDNESDAY AFTERNOON WHICH COULD PRODUCE STRONG GUSTY WINDS. A SMALL CRAFT ADVISORY MAY BE NEEDED FOR A PORTION OF THE MARYLAND CHESAPEAKE BAY ON THURSDAY. .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>506-061530- 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- 1025 PM EDT TUE AUG 5 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...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The national radar mosaic for the moment the first event began.
1 dense fog. Local standard time, as filed.
Visibilities of a quarter mile or less were measured at Warrenton Airport.
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: 540173.