A cold front stalled over the Mid Atlantic kept moisture and unsettled conditions across the region. Scattered showers and thunderstorms developed across central Maryland, including near the Baltimore and Washington DC suburbs.
Every event with a place to put it. 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 cold front stalled over the Mid Atlantic kept moisture and unsettled conditions across the region. Scattered showers and thunderstorms developed across central Maryland, including near the Baltimore and Washington DC suburbs. A storm in Prince Georges County became severe, downing several trees and power lines near Largo.
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, 2:12 PM EST, 3 hours 18 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 312 PM EDT SUN AUG 5 2007 .SYNOPSIS... A FRONTAL BOUNDARY WILL REMAIN NEARLY STATIONARY OVER THE AREA THROUGH TONIGHT...LIFTING NORTHEAST AS A WARM FRONT TOMORROW. HIGH PRESSURE WILL BE THE RULE FOR TUESDAY AND WEDNESDAY. A BACKDOOR FRONT WILL SAG SOUTH INTO THE MID ATLANTIC LATE DURING THE WEEK. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... WATER VAPOR LOOP SHOWS A PAIR OF MCVS EMBEDDED IN NORTHWEST FLOW...THE FIRST OVER THE OHIO VALLEY...FOLLOWED BY A MCV OVER CHICAGOLAND. ACARS 400-250MB WIND OBSERVATIONS REVEAL A 90-130KT JET WHICH RIDGES ACROSS THE ROCKIES...AND TROUGHS ACROSS THE CANADIAN MARITIMES. 11Z SURFACE ANALYSIS PLACED A DISSIPATING FRONT FROM THE MIDWEST SOUTHEAST THROUGH THE CAROLINAS. THE MAIN BAROCLINIC ZONE EXTENDS FROM THE MIDWEST SOUTHEAST THROUGH CHICAGO AND NEAR WASHINGTON DC. A 1020MB ANTICYCLONE WAS BUILDING ACROSS NEW ENGLAND. SURFACE BOUNDARY HAS BECOME QUASI STATIONARY AS IT BISECTS THE FORECAST AREA FROM W TO E. INCREASE IN ISENTROPIC LIFT AHEAD OF MCV SHOULD LEAD TO SCATTERED SHOWER AND THUNDERSTORM DEVELOPMENT AHEAD OF THE CONVECTIVE COMPLEX. BEST INSTABILITY IS IMPINGING FROM THE SOUTHEAST ACROSS LOWER SOUTHERN MARYLAND WITH DEW POINTS IN THE MID 70S. ADJUSTED 18Z KIAD RAOB INDICATES LI NEAR -9C...WHICH MATCHES GOES SATELLITE AND RUC ESTIMATES. GIVEN DEGREE OF INSTABILITY...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE SOUTHEAST FORECAST AREA. DYNAMICAL LIFT WILL BE INCREASING THIS EVENING FROM THE WEST (APPROACHING MCV) WHICH WILL ALLOW FOR ADDITIONAL STORM DEVELOPMENT. CONDITIONS MAY SUPPORT SUPERCELLS. DAMAGING WIND GUSTS ARE THE PRIMARY THREAT. IN ADDITION...PRECIPITABLE WATER VALUES ARE FORECAST TO RISE TO NEAR 2 INCHES...SUPPORTED BY GPS SENSORS IN THE OHIO VALLEY. THIS COULD LEAD TO LOCALLY HEAVY RAINFALL. MOST OF THE ACTIVITY IS EXPECTED TO MOVE TO THE NORTHEAST AFTER MIDNIGHT...WITH PERHAPS SECONDARY DEVELOPMENT ENTERING THE REGION FROM THE OHIO VALLEY LATE TONIGHT. AREAS OF FOG COULD DEVELOP BEHIND CONVECTION. LOWS ARE BASED ON THE 12Z MET GUIDANCE...AND WINDS OFF THE 12Z LWX WRF-ARW. && .SHORT TERM /6 AM MONDAY MORNING THROUGH 6 PM MONDAY/... FRONTAL BOUNDARY FORECAST TO LIFT TO THE NORTHEAST DURING THE MID MORNING...WITH SKIES BECOMING PARTLY SUNNY WITHIN THE WARM SECTOR. CONVECTIVE CHANCES REVOLVES AROUND STATE AT THE BEGINNING OF THE MORNING...WHETHER OHIO VALLEY STORMS MATERIALIZE AND APPROACH FROM THE NORTHWEST. THIS COULD TRIGGER ADDITIONAL DEVELOPMENT ON THE LEADING EDGE DURING THE MIDDAY AS ACTIVITY MOVES SOUTHEAST. OTHERWISE RIDGING ALOFT WILL BE OCCURRING AND ACTIVITY WILL BE MORE ISOLATED CLOSER TO THE MOUNTAINS. RETURN TO THE HEAT AND HUMIDITY MONDAY. WITH MID LEVEL WARMING...LOWER 90S A GOOD BET...EVEN AFTER MIXING OUT MORNING CLOUDINESS. WITH DEW POINTS NEAR 70F...HEAT INDEX MAY EXCEED 100F. && .LONG TERM /MONDAY NIGHT THROUGH SATURDAY/... NW FLO H5 PATTERN AT BEGINNING OF PD...THEN FLATTENS A BIT MID WEEK BEFORE H5 HIGH PRES GETS ESTABLISHED OVER LOWER TN VALLEY AND NW FLOW PATTERN RETURNS. SFC PATTERN IS A BIT MORE COMPLEX...WITH SFC TROF EXTENDING FROM NE US TO SE US THROUGH MUCH OF THE PERIOD. KEY INTEREST DURING THIS LONG TERM CYCLE IS THE THERMAL RIDGE BOTH THE NAM AND GFS PROGS INTO AREA ON TUE AFT...WITH H85 TEMPS AROUND +23C. THIS EQUATES TO UPPER90S/LOWER 100S WITH FULL SUN. 12Z MAV GIVES IAD AND DCA 100...BWI 99...AND RIC 103. WL BE ENHANCING HWO FOR POTL HEAT ADVSRY/EXCESSIVE HEAT FOR TUE. OTHERWISE...BERMUDA HIGH PRESSURE IS SHUNTED WELL OFFSHORE OF HATTERAS THIS WEEK...REPLACED BY SFC TROFS/LOW PRES. MORE STABLE AIR WILL BE IN PLACE STARTING FRIDAY NIGHT...AND LASTING THROUGH NEXT WEEKEND AS SFC HIGH PRES MAKES WAY TO MID ATLC FROM ONTARIO. && .AVIATION /19Z SUNDAY THROUGH FRIDAY/... FIRST MCS DISSIPATED WITH -SHRA AND VCTS EXPECTED ALONG AND AHEAD OF IT. BULK OF ACTIVITY IS ASSOCIATED WITH EASTERN OHIO MCV...TIMED TO ARRIVE DURING THE MID TO LATE EVENING. THIS COULD DROP CEILINGS INTO MVFR IF NOT IFR. LATER TONIGHT...GRADUAL SATURATED ISENTROPIC UPGLIDE UP FRONTAL SLOPE SHOULD PROVIDE AT LEAST POCKETS OF LOW MVFR OR IFR CEILINGS. CEILINGS LIFT THROUGH MVRF-VFR DURING THE MID MORNING WITH LIGHT HAZE. WARM AIRMASS SETTLES INTO THE REGION THIS WORK WEEK. ISOLATED TO SCATTERED DIURNAL CONVECTION EXPECTED TO LOCALLY REDUCE CEILINGS/VISIBILITIES AND PROVIDE LOCALLY HIGHER WIND GUSTS. && .MARINE... VEERING WINDS AS WARM ADVECTION INCREASES TONIGHT. IN ADDITION TO WIDESPREAD SHOWER AND THUNDERSTORMS (SOME MAY BE STRONG ENOUGH TO WARRANT SPECIAL MARINE WARNINGS)...WINDS MAY NEAR SMALL CRAFT CRITERIA IN THE MID BAY OVERNIGHT. GUIDANCE IS CLOSE TO 15 KTS WHICH IS REFLECTED IN THE FORECAST...BUT IF THE APPROACHING STORMS ARE STRONG ENOUGH...SOUTHERN CHANNELING MAY PUSH WINDS INTO SMALL CRAFT CRITERIA. WARM AIRMASS SETTLES INTO THE REGION THIS WORK WEEK. ISOLATED TO SCATTERED DIURNAL CONVECTION EXPECTED TO LOCALLY REDUCE VISIBILITIES AND PROVIDE LOCALLY HIGHER WIND GUSTS AND WAVES. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && SYNOPSIS...ROGOWSKI NEAR TERM...ROGOWSKI SHORT TERM...ROGOWSKI LONG TERM...LEE AVIATION...ROGOWSKI MARINE...ROGOWSKI
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 255 PM EDT SUN AUG 5 2007 ANZ530>537-DCZ001-MDZ003>007-009>011-013-014-016>018-501-502- VAZ021-025>031-036>042-050>057-WVZ050>055-501>504-061000- 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- 255 PM EDT SUN AUG 5 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...LATE THIS AFTERNOON AND TONIGHT SCATTERED TO NUMEROUS THUNDERSTORMS WILL DEVELOP LATE THIS AFTERNOON AND EVENING ACROSS THE OUTLOOK AREA. SOME OF THE STORMS WILL PRODUCE HEAVY RAINFALL. IN ADDITION...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN AN AREA EAST OF FREDERICKSBURG AND SOUTH OF ANNAPOLIS...INCLUDING LOWER SOUTHERN MARYLAND THE THE ADJACENT WATERS OF THE TIDAL POTOMAC RIVER AND CHESAPEAKE BAY. THE MOST LIKELY RISK IS LOCALLY DAMAGING WINDS BETWEEN 4 PM AND 9 PM. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SUNDAY FROM MONDAY THROUGH WEDNESDAY...HEAT INDEX VALUES ARE EXPECTED TO BE NEAR 100 DEGREES EACH DAY. TUESDAY IN PARTICULAR LOOKS TO BE THE HOTTEST OF THOSE THREE DAYS...WITH HEAT INDICES RANGING FROM 100 TO 105 DEGREES ACROSS THE REGION. SCATTERED THUNDERSTORMS ARE EXPECTED MONDAY. ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE DURING THE AFTERNOON AND EVENING...PRIMARILY IN AREAS INCLUDING AND NORTHEAST OF BALTIMORE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS EVENING. ROGOWSKI/LEE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 157 PM EDT SUN AUG 5 2007 DCZ001-MDZ013-014-016>018-VAZ054>057-060000- DISTRICT OF COLUMBIA-PRINCE GEORGES-ANNE ARUNDEL-CHARLES- ST. MARYS-CALVERT-ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD- SPOTSYLVANIA-KING GEORGE- INCLUDING THE CITIES OF...WASHINGTON...ANNAPOLIS...WALDORF... ST MARYS CITY...ALEXANDRIA...FALLS CHURCH...FREDERICKSBURG 157 PM EDT SUN AUG 5 2007 ...SEVERE THUNDERSTORMS POSSIBLE LATE THIS AFTERNOON AND EVENING... SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP LATE THIS AFTERNOON AND EVENING IN AN AREA INCLUDING AND SOUTHEAST OF A LINE FROM FREDERICKSBURG VIRGINIA...TO WASHINGTON DC...TO THE CHESAPEAKE BAY BRIDGE. THIS AREA INCLUDES THE SOUTHEAST GREATER WASHINGTON METROPOLITAN AREA...SOUTHERN MARYLAND...THE LOWER TIDAL POTOMAC RIVER SOUTH OF THE ROUTE 301 BRIDGE...AND THE CHESAPEAKE BAY FROM SANDY POINT MARYLAND TO SMITH POINT VIRGINIA. THERE IS SUFFICIENT MOISTURE AND SPIN IN THE ATMOSPHERE TO ALLOW THESE THUNDERSTORMS TO BECOME STRONG TO SEVERE...WITH THE PRIMARY RISK OF LOCALLY DAMAGING WIND GUSTS. THOSE PEOPLE WITH OUTDOOR ACTIVITIES SHOULD KEEP AN EYE TO THE SKY AND MOVE INDOORS SHOULD THREATENING WEATHER APPROACH. BOATERS SHOULD BE PARTICULARLY ALERT TO SEEK SAFE HARBOR BEFORE THREATENING WEATHER OCCURS. ROGOWSKI/LEE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 552 PM EDT SUN AUG 5 2007 MDZ013-052215- PRINCE GEORGES MD- 552 PM EDT SUN AUG 5 2007 ...STRONG THUNDERSTORMS TO AFFECT PRINCE GEORGES COUNTY... AT 552 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER BRANDYWINE...MOVING EAST AT 10 TO 15 MPH. AREAS OF THE COUNTY SOUTH AND EAST OF BRANDYWINE ARE IN THE PATH OF THIS STORM. EXPECT WIND GUSTS TO 45 MPH AND VERY HEAVY DOWNPOURS THROUGH 700 PM. RDH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 617 PM EDT SUN AUG 5 2007 MDZ014-052245- ANNE ARUNDEL MD- 617 PM EDT SUN AUG 5 2007 ...STRONG THUNDERSTORMS TO AFFECT SOUTHERN ANNE ARUNDEL COUNTY... AT 617 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 2 MILES WEST OF TRACYS LANDING...MOVING EAST AT 10 TO 15 MPH. THE COMMUNITIES OF SHADY SIDE...TRACYS LANDING AND DEALE WILL BE AFFECTED BY THIS STORM. EXPECT VERY HEAVY DOWNPOURS AND WIND GUSTS TO 45 MPH AS IT MOVES THROUGH. RDH
The Sterling radar (KLWX), 57 km away, was scanning. The volume nearest the first event began at 22:30 UTC.
1 thunderstorm wind. Local standard time, as filed.
Prince Georges Emergency Management had multiple reports of downed trees and power lines in central Prince Georges County near Largo, MD.
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: 51796.