A surface trough was located across the area. Clearing occurred overnight and dense fog formed across a saturated ground.
Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
A surface trough was located across the area. Clearing occurred overnight and dense fog formed across a saturated ground.
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 4, 2:48 AM EST, 7 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 348 AM EDT MON AUG 4 2014 .SYNOPSIS... A SURFACE TROUGH WILL REMAIN OVER THE MID-ATLANTIC REGION THROUGH TUESDAY. A WEAK COLD FRONT WILL PASS THROUGH THE REGION WEDNESDAY AND HIGH PRESSURE WILL BUILD IN FOR LATE IN THE WEEK. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... SHOWERS HAVE DISSIPATED EARLY THIS MORNING ACROSS THE CWA...BUT AREAS THAT HAVE CLEARED OUT WILL BE VULNERABLE FOR FOG FORMATION. ALREADY HAVE LOW VISIBILITIES IN FOG ACROSS NORTHERN MARYLAND...AND THIS WILL LIKELY EXPAND FURTHER SOUTH INTO CENTRAL MARYLAND AND EXTREME EASTERN PANHANDLE OF WEST VIRGINIA...MAYBE EVEN NORTHERN VIRGINIA. LOCAL DENSE FOG MAY OCCUR AND SPS HAS BEEN ISSUED. FOG DIMINISHES WITHIN AN HOUR OR TWO AFTER SUNRISE. LATEST MODELS SUGGEST MUCH OF THE CWA WILL BE DRY TODAY UNDER A MIX OF SUN AND CLOUDS. COASTAL FRONT HAS MOVED A LITTLE FURTHER EAST...AND CAN/T RULE OUT A FEW SHOWERS CLIPPING SOUTHERN MARYLAND THIS AFTERNOON BUT THE REST OF THE CWA SHOULD BE FAR ENOUGH AWAY TO BE SPARED FROM SHOWERS. FOLLOWED A BLEND OF BIAS CORRECTED ADJMAV/SREFS FOR MAXIMA TODAY...WITH MAXIMA GETTING CLOSER TO NORMAL FOR EARLY AUGUST. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/... WEAK SURFACE HIGH WILL BE LOCATED OVER THE CWA TONIGHT. IF CLOUDS ARE KEPT TO A MINIMUM...THEN PATCHY FOG WILL LIKELY DEVELOP AGAIN OVERNIGHT. CLOUDS SHOULD INCREASE FOR TUESDAY AS MODELS SHOW AN APPROACHING SHORTWAVE TROUGH. THIS MAY ALSO LEAD TO SCATTERED SHOWERS AND THUNDERSTORMS FOR THE AFTERNOON /PARTICULARLY NEAR THE HIGHER ELEVATIONS/ BUT WITH WEAK INSTABILITY/SHEAR SEVERE WEATHER IS NOT EXPECTED ATTM. && .LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/... CYCLONIC FLOW ALOFT PERSISTS FOR THE REST OF THE WORK WEEK. A COASTAL FRONT WILL BE OFF THE EAST COAST WHILE TS BERTHA MOVES EASTWARD AND TOWARDS THE CENTRAL ATLANTIC BASIN. HIGH PRESSURE WILL PERSIST ACROSS THE REGION TUESDAY EVENING AND INTO WEDNESDAY. A FEW SHOWERS AND THUNDERSTORMS ARE POSSIBLE EARLY TUESDAY EVENING AS WANING CONVECTION FROM AFTERNOON HEATING ACROSS THE TERRAIN MOVES EASTWARD. A SIMILAR SETUP WILL OCCUR WEDNESDAY AS WEAK IMPULSES MOVE IN THE CYCLONIC FLOW ALOFT AND TERRAIN CIRCULATIONS PRODUCE SHOWERS AND THUNDERSTORMS. ACTIVITY WILL MOVE EASTWARD THROUGHOUT THE DAY BUT ACTIVITY SHOULD BE SUB SEVERE. DEWPTS WILL BE AROUND 60 DEG AND INSTABILITY IS WEAK. FCST TEMPS ARE EXPECTED TO BE AROUND OR SLIGHTLY ABOVE NORMAL MID WEEK. A TROUGH AXIS WILL CROSS THE REGION THURSDAY AND NRLY WINDS WILL PUSH THE COASTAL FRONT FURTHER SOUTH. DRY CONDITIONS ARE EXPECTED THURSDAY AND FRIDAY AS HIGH PRESSURE MOVES INTO THE REGION. HIGH PRESSURE MOVES OFF THE COAST SATURDAY AND HUMIDITY WILL INCREASE AS SRLY FLOW BEGINS. AT THIS TIME...SHOWERS AND THUNDERSTORMS SHOULD STAY CONFINED SW VA. FCST TEMPS ARE EXPECTED TO BE AROUND NORMAL NEXT WEEKEND. && .AVIATION /08Z MONDAY THROUGH FRIDAY/... LOW VIS EXPECTED IN FOG AT MRB THROUGH 12Z-13Z. MAY SEE A PERIOD OF MVFR VIS AT IAD/BWI...BUT CONFIDENCE LOW DUE TO LINGERING MID CLOUDS OVERHEAD. AFTER FOG CONCERNS...VFR EXPECTED TO PREVAIL TODAY WITH ANY SHOWERS LIKELY REMAINING AWAY FROM THE TERMINALS. MAY HAVE SOME FOG FORMATION AGAIN LATE TONIGHT. CHANCE OF THUNDERSTORMS WITH A SHORTWAVE TUESDAY AFTERNOON. SHRA AND TSRA IS POSSIBLE WEDNESDAY AS A UPPER LEVEL TROUGH MOVES OVER THE MID-ATLANTIC. NRLY FLOW WILL MOVE INTO THE REGION FOR THE END OF THE WEEK. VFR CONDITIONS EXPECTED. && .MARINE... FRONT REMAINS OFFSHORE THROUGH TUESDAY. WEAK GRADIENT PREVAILS AND THUS EXPECT WINDS TO GENERALLY REMAIN 10 KT OR LESS THROUGH THEN. A FEW SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE WEDNESDAY AND MAY LEAD TO GUSTY WINDS ACROSS THE WATERS. NRLY WINDS EXPECTED THROUGH THE END OF THE WEEK. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && SYNOPSIS...BPP/HAS NEAR TERM...BPP SHORT TERM...HAS LONG TERM...HAS AVIATION...BPP/HAS MARINE...BPP/HAS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 107 AM EDT MON AUG 4 2014 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 041000- 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- 107 AM EDT MON AUG 4 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...MONDAY THROUGH SATURDAY 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>506-041000- 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- 107 AM EDT MON AUG 4 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...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1006 PM EDT SUN AUG 03 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0925 PM HAIL OWINGS MILLS 39.41N 76.79W
08/03/2014 E0.88 INCH BALTIMORE MD PUBLIC
NICKEL SIZE HAIL ON I-795 NEAR OWINGS MILLS... MD
&&
EVENT NUMBER LWX1400912
KLWSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 309 AM EDT MON AUG 4 2014 MDZ003>007-009>011-WVZ051>053-041200- WASHINGTON-FREDERICK MD-CARROLL-NORTHERN BALTIMORE-HARFORD- MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-MORGAN-BERKELEY-JEFFERSON- INCLUDING THE CITIES OF...HAGERSTOWN...FREDERICK...WESTMINSTER... GAITHERSBURG...COLUMBIA...BALTIMORE...MARTINSBURG...CHARLES TOWN 309 AM EDT MON AUG 4 2014 ...PATCHY DENSE FOG FOR THE MORNING COMMUTE... AREAS OF FOG WILL AFFECT NORTH CENTRAL MARYLAND AND PORTIONS OF THE EASTERN PANHANDLE OF WEST VIRGINIA THIS MORNING. VISIBILITIES WILL BE LOCALLY REDUCED TO AROUND ONE QUARTER MILE AT TIMES...MAKING FOR HAZARDOUS TRAVEL CONDITIONS. THE FOG SHOULD LIFT BETWEEN 7 AM AND 8 AM. MOTORISTS...INCLUDING THOSE TRAVELING ON INTERSTATE 70... INTERSTATE 83...AND INTERSTATE 81...SHOULD BE PREPARED FOR SUDDEN DROPS IN VISIBILITY. REDUCE YOUR SPEED...AND USE LOW BEAM HEADLIGHTS SO THAT YOU CAN BEEN SEEN.
The national radar mosaic for the moment the first event began.
8 dense fog. Local standard time, as filed.
Visibilities of a quarter mile or less were measured at Warrenton Airport.
Visibilities of a quarter mile or less were measured at Culpeper Airport.
Visibilities of a quarter mile or less were measured at surrounding locations.
Visibilities of a quarter mile or less were measured at surrounding locations.
Visibilities of a quarter mile or less were measured at surrounding locations.
Visibilities of a quarter mile or less were measured at Manassas Airport.
Visibilities of a quarter mile or less were measured at surrounding locations.
Visibilities of a quarter mile or less were measured at Luray 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: 540167, 540164, 540166, 540162, 540163, 540165, 540169, 540168.