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; 3 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 3, 9:02 PM EST, 3 hours 58 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1002 PM EDT SUN AUG 3 2014 .SYNOPSIS... A SURFACE TROUGH WILL REMAIN OVER THE 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 /THROUGH MONDAY/... A CLOSED UPPER LOW UNDERGOING A GRADUAL DISSIPATION UP TO OUR NORTH...AS IT WRAPS UP AND PIVOTS OVER N CNTRL PA. THE TROUGH AXIS DANGLING OUT OF THE SRN PERIPHERY HAS BEEN KICKING-OFF A LINE OF MAINLY DISCRETE CONVECTION OVER THE NRN HALF OF THE CWA FOR THE PAST FEW HRS. THIS SLOWLY MOVING TROUGH AXIS HAS BEEN TRUDGING ACROSS THE AREA AND IS APPROACHING THE BALT/DC METRO AREAS. STORM INTENSITY IS ON THE DOWN-TURN W/ THE LOSS OF DAYTIME HEATING BUT THE HIGH LOW-LEVEL MOISTURE CONTENT HAS BEEN MAKING UP FOR SOME OF THE LACK OF INSTABILITY. FAVORABLE LAPSE RATES IN THE LOW LEVELS APPEAR ON THE 00Z KIAD SOUNDING...A FUNCTION OF THE COOLER NEARBY UPPER TROUGH. THIS ASPECT OF OUR CURRENT AIRMASS WILL CONTINUE THE TSTM DEVELOPMENT ACROSS ALONG THE INCOMING TROUGH AXIS UNTIL THE BOUNDARY REACHES THE COAST...UNLESS THE INVERSION CAN SET-UP OUT AHEAD OF THE BOUNDARY. FROM PREV DISC... THE 500MB LOW WILL MOVE AWAY FROM THE AREA LATER TONIGHT AND DRY CONDITIONS ARE EXPECTED BEHIND IT. LOW-LEVEL MOISTURE TRAPPED UNDERNEATH THE NOCTURNAL INVERSION WILL CAUSE SOME FOG...ESPECIALLY IN THE SHELTERED VALLEYS AND RURAL AREAS. HEIGHTS WILL RISE MONDAY BEHIND THE DEPARTING DISTURBANCE...BUT THE SURFACE TROUGH WILL REMAIN OVERHEAD. MORE SUNSHINE AND HIGHER HEIGHTS WILL ALLOW FOR SEASONABLY HOTTER CONDITIONS. MAX TEMPS WILL RANGE FROM THE 70S IN THE MOUNTAINS TO THE MID AND UPPER 80S ACROSS MOST OTHER LOCATIONS. A SHOWER OR THUNDERSTORM CANNOT BE RULED OUT...MAINLY EAST OF THE SURFACE TROUGH OVER SOUTHERN MARYLAND. HOWEVER...MUCH OF THE TIME WILL BE DRY AND MOST AREAS WILL ALSO TURN OUT DRY FOR THE ENTIRE DAY. && .SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/... AN UPPER-LEVEL TROUGH WILL BUILD OVERHEAD MONDAY NIGHT THROUGH WEDNESDAY WHILE BERTH PASSES BY TO OUR EAST. A SURFACE TROUGH WILL ALSO REMAIN OVER THE REGION DURING THIS TIME. SEASONABLY WARM AND HUMID CONDITIONS ARE EXPECTED DURING THIS TIME ALONG WITH THE CHANCE FOR SHOWERS AND THUNDERSTORMS. THE BEST CHANCE FOR SHOWERS AND THUNDERSTORMS WILL BE DURING THE AFTERNOON AND EVENING HOURS TUESDAY AND WEDNESDAY. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... HIGH PRESSURE CENTERED OVER QUEBEC WILL NOSE ITS WAY IN ON WED NIGHT AND SETTLE ACROSS THE REGION THROUGH SUN. POTL FOR TERRAIN BASED SHRA/TSTMS WILL BEGIN ON THU AFT WITH WEAK WIND PROFILE. GULF MOISTURE WILL RIDE UP INTO SE U.S. DURING THIS TIME...AND EXPECT THE BOUNDARY BETWEEN THIS WARM MOIST AIR AND THE QUEBEC HIGH WILL BE SOUTH OF CWA PER THE 00Z ECMWF. 12Z MEX FOR DCA HAS TEMPS IN THIS PERIOD SLIGHTLY BELOW NORMAL FOR DAYTIME HIGHS AND SLIGHTLY ABOVE NORMAL FOR NIGHT TIME LOWS. SEVERE WX CHANCES APPEAR BELOW NORMAL AS WELL. && .AVIATION /01Z MONDAY THROUGH FRIDAY/... A LINE OF CONVECTION SLOWLY/SURELY MAKING IT TO THE I-95 CORRIDOR OF NRN VA/NE MD. THE DC AND BALT AREAS NOW BEING AFFECTED - LIKELY ENDING BEFORE MIDNIGHT EVEN W/ THE SLOW MOVEMENT. THE SHEN VLY IN THE CLEAR NOW...AS WILL BE KIAD BY 03Z. AREAS OF FOG ARE EXPECTED OVERNIGHT WITH MVFR/IFR VSBYS. ANY FOG WILL BURN OFF BY MID-MORNING MONDAY AND VFR CONDITIONS ARE EXPECTED THE REST OF MONDAY ALONG WITH LIGHT WINDS. AN UPPER-LEVEL TROUGH WILL BUILD OVERHEAD TUESDAY AND WEDNESDAY. A COUPLE AFTERNOON/EVENING SHOWERS AND THUNDERSTORMS ARE POSSIBLE. OTHERWISE...MOST OF THE TIME WILL BE WITH VFR CONDITIONS. VFR CONDITIONS EXPECTED DAYS 4-7. && .MARINE... A SURFACE TROUGH WILL REMAIN OVER THE WATERS THROUGH TUESDAY...BUT THE PRESSURE GRADIENT WILL BE WEAK. WINDS WILL BE LIGHT DURING THIS TIME. A WEAK COLD FRONT WILL MOVE INTO THE AREA WEDNESDAY...BUT WIND SPEEDS SHOULD STILL REMAIN BELOW SCA CRITERIA. BEST CHANCE FOR SCA WINDS OVER THE NEXT WEEK WILL BE POST FRONTAL ON THURSDAY. OTHERWISE...VERY WEAK WIND FIELD AOB H85 THROUGH DAY 7. && .TIDES/COASTAL FLOODING... AN ONSHORE FLOW HAS CAUSED TIDAL ANOMALIES TO RISE TO BETWEEN 0.75 AND 1 FOOT ABOVE NORMAL. THE POSITIVE TIDAL ANOMALIES SHOULD CONTINUE THROUGH THE HIGH TIDE CYCLE TONIGHT. DUE FEEL THAT THE ONSHORE FLOW WILL BE LIGHT ENOUGH TO PREVENT MINOR COASTAL FLOODING...BUT IT WILL BE CLOSE FOR ANNAPOLIS IN ANNE ARUNDEL COUNTY. HIGH TIDE IS AT 11:58 PM THIS EVENING. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && UPDATE...GMS PREV DISCUSSION...BJL/LEE
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
945 PM EDT SUN AUG 03 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0927 PM HAIL 1 E MCDONOGH 39.39N 76.75W
08/03/2014 M1.00 INCH BALTIMORE MD TRAINED SPOTTER
QUARTER SIZE HAIL ALONG MT. WILSON LANE
&&
EVENT NUMBER LWX1400911
KLWPRELIMINARY 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
KLWThe national radar mosaic for the moment the first event began.
3 dense fog. Local standard time, as filed.
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.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2014Every state in 2014This day in weather historyWarnings in Maryland, 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: 540170, 540171, 540172.