Widely scattered showers and thunderstorms developed in a hot and humid air mass on the afternoon of August 3rd. A storm in Baltimore County became severe, downing trees and producing small hail.
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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.
Widely scattered showers and thunderstorms developed in a hot and humid air mass on the afternoon of August 3rd. A storm in Baltimore County became severe, downing trees and producing small hail.
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, 1:32 PM EST, 1 hour 2 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 232 PM EDT FRI AUG 3 2007 .SYNOPSIS... SCATTERED THUNDERSTORMS AREAWIDE THIS AFTERNOON AND EVENING AS A MID LEVEL DISTURBANCE PASSES OVERHEAD. CONTINUED WARM TEMPS SATURDAY AS A WEAK FRONT PUSHES SOUTH OF THE AREA. SHOWERS AND THUNDERSTORMS RIDING THE FRONT FROM THE GREAT LAKES MAY AFFECT THE REGION SUNDAY. THIS FRONT WILL LIFT NORTHEAST AS A WARM FRONT BY MONDAY WITH HEAT AND HUMIDITY RETURNING FOR NEXT WEEK. && .NEAR TERM /THROUGH TONIGHT/... WATER VAPOR LOOP SHOWS AN UPPER TROUGH MOVING THROUGH THE OHIO VALLEY. ACARS 400-250MB OBSERVATIONS ALSO SHOW THE UPPER LEVEL TROUGH...WITH A 50-70KT SOUTHWESTERLY JET FROM THE EASTERN GULF STATES THROUGH THE CAROLINAS. 11Z SURFACE ANALYSIS PLACED THE NEXT COLD FRONT SOUTHWEST ACROSS THE GREAT LAKES AND CHICAGOLAND...TO A 1016MB CYCLONE NEAR ST LOUIS. A PRE-FRONTAL TROUGH WAS EVIDENT...COINCIDING WITH THE UPPER TROUGH OVER THE OHIO VALLEY. EARLY MORNING CONVECTION IN THE APPALACHIANS INDICATES AMOUNT OF MID LEVEL INSTABILITY AVAILABLE TODAY. ADJUSTED 12Z KIAD RAOB INDICATES ABOUT 1200 J/KG MIXED LAYER CAPE. WHEN COMBINED WITH WEAK BOUNDARY LAYER FLOW...THIS IS MORE THAN ENOUGH ENERGY FOR SOLENOIDAL CIRCULATION TERRAIN STORM DEVELOPMENT. IN ADDITION...WILL HAVE TO MONITOR THE PASSAGE OF THE MID LEVEL TROUGH LATE THIS AFTERNOON AS THIS MAY TRIGGER ADDITIONAL DEVELOPMENT AND AID IN STORM ORGANIZATION. WITH WARM TEMPERATURES ALOFT...THE DRY SOUNDING SUGGESTS GREATEST STORM RISK IS LOCALLY DAMAGING WINDS. GIVEN SLOW STORM MOVEMENT...A FEW LOCATIONS COULD SEE LOCALLY HEAVY RAINFALL. OTHER CONSIDERATION IS THE AFTERNOON HEAT. HIGHS ARE BASED ON YESTERDAY (GIVEN NEARLY ZERO ADVECTION). DEWPOINTS SHOULD LEVEL OFF OR SLOWLY DECLINE THIS AFTERNOON. THIS COMBINES TO PRODUCE HEAT INDEX VALUES NEARING 100F. WILL AGAIN HIGHLIGHT IN HWO AS IS LOOKS JUST SHY OF ADVISORY CRITERIA IN THE CITIES. BEST CONVECTIVE COVERAGE EXPECTED THIS EVENING COINCIDENT WITH PASSAGE OF MID LEVEL TROUGH. DID ADJUST POPS TO INDICATE BEST COVERAGE EAST OF THE BLUE RIDGE BASED ON THE TIMING OF THIS FEATURE. WILL HAVE TO MONITOR FOR A FEW STRONG TO SEVERE STORMS. EXPECT TO CLEAR OUT BEHIND THE TROUGH. WITH DEWPOINTS EXPECTED TO SLOWLY CLIMB THERE COULD BE SOME AREAS OF LIGHT FOG...MORE CONCENTRATED IN SHELTERED VALLEYS WHICH RECEIVE RAINFALL. LOWS ARE BASED ON MET GUIDANCE WHICH HAS BEEN PREFORMING WELL RECENTLY...ADJUSTED FOR LOCAL BIAS. WIND FORECAST IS BASED ON THE 12Z 4KM WRF-ARW. && .SHORT TERM /SATURDAY/... MID LEVEL TROUGH PASSES TO THE EAST TOMORROW...WITH SUBSIDENCE SUPPORTING EARLY SUNSHINE. A FEW STORMS WILL BE POSSIBLE...ESPECIALLY IN THE PIEDMONT AS THE COLD FRONT MOVES SOUTH INTO MARYLAND LATE DURING THE AFTERNOON. WITH SLIGHTLY LESS MOISTURE AND ADDED SUBSIDENCE...FORECAST MAX TEMPERATURES ARE SEVERAL DEGREES WARMER THAN TODAY. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... EC/GFS MODELS/ENSEMBLES CONTINUE TO BE IN GOOD AGREEMENT WITH OVERALL PATTERN. MAIN WEATHER FEATURES AFFECTING THE U.S. OVER THE NEXT WEEK WILL BE A BROAD TROF ACROSS THE WEST COAST WHILE A FLAT UPPER RIDGE WILL PREVAIL ACROSS THE EASTERN THIRD OF THE COUNTRY. WESTERLIES WILL MIGRATE NORTH ACROSS THE CANADIAN BORDER BUT PERIODICALLY DIP INTO THE GREAT LAKES AREA FOR THE UPCOMING WEEK. AS A RESULT...THIS WILL ALLOW WEAK FRONTS TO MIGRATE INTO OR JUST NORTH OF THE AREA THROUGH FRIDAY. STATIONARY FRONTAL BOUNDARY ACROSS AREA WILL BE THE FOCUS MECHANISM FOR A WEAKENING MCS SLIDING EASTWARD INTO AREA FOR SUNDAY AFTERNOON/NIGHT. GFS HAS BEEN ADVERTISING THIS FOR SEVERAL DAYS SO HIGH CHANCE POPS SHOULD SUFFICE. A SECOND...BACKDOOR FRONT...FORECAST TO SLIDE SOUTH ACROSS CWA LATE MONDAY AND STALL ACROSS SOUTHEAST ZONES. ANOTHER WAVE SLIDING BY TO OUR NORTH SHOULD GIVE THE STALLED FRONT A KICK SOUTH OF THE REGION BY FRIDAY. GIVEN THE ABOVE...WILL NEED TO HAVE A MENTION OF DIURNAL CHANCE/SLIGHT POPS IN EXTENDED FORECAST EACH DAY. ABOVE NORMAL TEMPERATURES WILL CONTINUE THROUGH THE PERIOD. && .AVIATION /18Z FRIDAY THROUGH WEDNESDAY/... ISOLATED LATE AFTERNOON CONVECTION SHOULD STRENGTHEN AND INCREASE IN COVERAGE EARLY THIS EVENING WITH ARRIVAL OF MID LEVEL TROUGH. PATCHY LIGHT FOG EXPECTED ACROSS RURAL SITES...WHICH MAY BECOME LOCALLY DENSE IF RAINFALL OCCURS. MORE ISOLATED CONVECTION SATURDAY. SCATTERED STORMS EXPECTED SUNDAY AFTERNOON/EVENING...MORE ISOLATED AFTERNOON AND EVENING STORMS FORECAST FOR THE REST OF THE WEEK. WINDS WILL BE HIGHER NEAR STORMS. LOCALLY REDUCED VISIBILITIES AND CLOUD TO GROUND LIGHTNING WILL BE POSSIBLE. && .MARINE... SOUTHERLY WINDS EXPECTED TO CHANNEL TO NEAR SMALL CRAFT CRITERIA THIS EVENING ACROSS THE BAY AND LOWER POTOMAC (BASED ON 12Z GFS/ETA MOS AND 12Z WRF-LWX). SCATTERED STORMS THIS EVENING...MORE ISOLATED SATURDAY. SCATTERED STORMS EXPECTED SUNDAY AFTERNOON/EVENING...ISOLATED AFTERNOON/EVENING STORMS FORECAST FOR THE REST OF THE WEEK. WINDS AND WAVES WILL BE HIGHER NEAR STORMS. LOCALLY REDUCED VISIBILITIES AND CLOUD TO GROUND LIGHTNING WILL BE POSSIBLE. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && SYNOPSIS...ROGOWSKI NEAR TERM...ROGOWSKI SHORT TERM...ROGOWSKI LONG TERM...RW AVIATION...ROGOWSKI/RW MARINE...ROGOWSKI/RW
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 200 PM EDT FRI AUG 3 2007 ANZ530>537-DCZ001-MDZ003>007-009>011-013-014-016>018-501-502- VAZ021-025>031-036>042-050>057-WVZ050>055-501>504-041000- 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- DISTRICT OF COLUMBIA-WASHINGTON-FREDERICK MD-CARROLL- NORTHERN BALTIMORE-HARFORD-MONTGOMERY-HOWARD-SOUTHERN BALTIMORE- PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS-CALVERT- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-HIGHLAND- AUGUSTA-ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE- NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-FAUQUIER-LOUDOUN- ORANGE-CULPEPER-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX- ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA- KING GEORGE-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-PENDLETON-HARDY- WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL- 200 PM EDT FRI AUG 3 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MARYLAND WEST OF THE EASTERN SHORE INCLUDING THE CHESAPEAKE BAY AND EAST OF GARRETT COUNTY...EASTERN WEST VIRGINIA...NORTHERN AND CENTRAL VIRGINIA... WASHINGTON DC AND THE TIDAL POTOMAC RIVER. .DAY ONE...THIS AFTERNOON AND TONIGHT WIDELY SCATTERED THUNDERSTORMS ARE ANTICIPATED THIS AFTERNOON AND EVENING. A FEW OF THESE MAY BECOME SEVERE WITH DAMAGING WINDS AND LARGE HAIL. HOT AND HUMID WEATHER WILL CONTINUE THIS AFTERNOON WITH HEAT INDICES TOPPING OUT IN THE UPPER 90S TO NEAR 100F. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY HEAT INDICES ON SATURDAY ARE EXPECTED TO TOP OUT AROUND 100 DEGREES. A TEMPORARY RELIEF TO THE HEAT AND HUMIDITY IS EXPECTED SUNDAY AS COOLER AND LESS HUMID AIR WORKS INTO THE AREA BEHIND A WEAK FRONT. HOT AND HUMID CONDITIONS WILL RETURN NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS AFTERNOON. ROGOWSKI
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 243 PM EDT FRI AUG 3 2007 VAZ051-031915- CULPEPER VA- 243 PM EDT FRI AUG 3 2007 ...STRONG THUNDERSTORMS TO AFFECT CULPEPER COUNTY... AT 242 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER MITCHELLS...MOVING LITTLE. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 40 MPH. THE COMMUNITIES OF MITCHELLS AND WINSTON WILL BE AFFECTED BY THIS STORM. SMZ
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 252 PM EDT FRI AUG 3 2007 VAZ052-031915- PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- 252 PM EDT FRI AUG 3 2007 ...STRONG THUNDERSTORMS TO AFFECT PRINCE WILLIAM/MANASSAS/MANASSAS PARK COUNTY... AT 252 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER NOKESVILLE...MOVING SLOWLY NORTHEAST AT 5 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 40 MPH. THE COMMUNITIES OF NOKESVILLE AND MANASSAS WILL BE AFFECTED BY THIS STORM. SMZ
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 307 PM EDT FRI AUG 3 2007 MDZ006-007-011-031930- NORTHERN BALTIMORE MD-HARFORD MD-SOUTHERN BALTIMORE MD- 307 PM EDT FRI AUG 3 2007 ...STRONG THUNDERSTORMS TO AFFECT NORTHERN BALTIMORE...HARFORD AND SOUTHERN BALTIMORE COUNTIES... AT 307 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER GLEN ARM...MOVING EAST AT 5 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 50 MPH. THE COMMUNITIES OF KINGSVILLE...UPPER FALLS...AND PLEASANT HILLS WILL BE AFFECTED BY THIS STORM. SAR
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 322 PM EDT FRI AUG 3 2007 VAZ051-031945- CULPEPER VA- 322 PM EDT FRI AUG 3 2007 ...STRONG THUNDERSTORMS TO AFFECT CULPEPER COUNTY... AT 322 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER CATALPA...MOVING EAST AT 10 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 50 MPH. THE COMMUNITIES OF ALANTHUS...BRANDY STATION AND ELKWOOD WILL BE AFFECTED BY THIS STORM. SAR
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 325 PM EDT FRI AUG 3 2007 VAZ041-032000- FAUQUIER VA- 325 PM EDT FRI AUG 3 2007 ...STRONG THUNDERSTORMS TO AFFECT FAUQUIER COUNTY... AT 325 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 2 MILES NORTHWEST OF AUBURN...MOVING EAST AT 10 MPH. ANOTHER STRONG STORM WAS LOCATED 2 MILES NORTH OF OPAL ALSO MOVING EAST AT 10 MPH. BOTH THESE STORMS WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 40 MPH. THE COMMUNITIES OF WARRENTON...OPAL...AUBURN...CALVERTON AND CATLETT WILL BE AFFECTED BY THIS STORM. SMZ
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 330 PM EDT FRI AUG 3 2007 VAZ052-032000- PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- 330 PM EDT FRI AUG 3 2007 ...STRONG THUNDERSTORMS TO AFFECT PRINCE WILLIAM/MANASSAS/MANASSAS PARK COUNTY... AT 330 PM EDT...DOPPLER RADAR INDICATED ANOTHER STRONG THUNDERSTORM HAD DEVELOPED 5 MILES NORTHWEST OF NOKESVILLE...AND MOVING SLOWLY EAST AT 5 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 40 MPH...ALONG WITH HEAVY RAINFALL. THE COMMUNITIES OF NOKESVILLE AND ADEN WILL BE AFFECTED BY THIS STORM. SMZ
The Sterling radar (KLWX), 102 km away, was scanning. The volume nearest the first event began at 19:34 UTC.
2 thunderstorm wind. Local standard time, as filed.
Baltimore County officials reported a tree down in White Marsh.
A Trained Spotter measured a wind gust of 58 mph, as well as half inch hail, in Rosedale. A Baltimore County official reported a tree down on Crafton Road in Essex.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2007Every state in 2007This day in weather historyWarnings in Maryland, August 2007
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: 51776, 51778.