A Bermuda High continued to usher tropical moisture into the Mid Atlantic. A shortwave trough ahead of the main trough produced showers and thunderstorms in the unsettled region.
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 Bermuda High continued to usher tropical moisture into the Mid Atlantic. A shortwave trough ahead of the main trough produced showers and thunderstorms in the unsettled region.
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 Jul 11, 1:41 PM EST, 6 hours 48 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 241 PM EDT THU JUL 11 2013 .SYNOPSIS... A COLD FRONT WILL CROSS THE AREA TODAY BEFORE STALLING TO THE SOUTHEAST. UPPER LEVEL LOW PRESSURE OVER NEW ENGLAND WILL SLOWLY WORK ITS WAY SOUTHWARD SATURDAY. HIGH PRESSURE OVER LONG ISLAND WILL MOVE SOUTH ALONG THE COAST EARLY NEXT WEEK. && .NEAR TERM /THROUGH FRIDAY/... UPPER LEVEL TROUGH WILL SWING EASTWARD ACROSS THE GREAT LAKES TODAY. BERMUDA HIGH STAYS STATIONARY IN THE ATLANTIC BRINGING TROPICAL MOISTURE TO AREAS ALONG MID ATLANTIC COAST. A SHORTWAVE TROUGH WILL INTENSIFY OVER THE CAROLINAS AND MOVE NORTHEAST AHEAD OF THE UPPER LEVEL TROUGH THROUGH THIS EVENING. AT THE SFC...A COLD FRONT EXTENDS ACROSS DELMARVA TO THE PIEDMONT AREA. THE SFC COLD FRONT HAS MOVED SOUTHEAST ACROSS MOST OF THE AREA THIS MORNING. IT HAS BROUGHT IN DRIER AIR CREATING POCKETS OF CLEAR SKIES ACROSS THE MID ATLANTIC. DEWPTS HAVE DROPPED 10 DEGREES SINCE THIS MORNING AND ARE NOW IN THE MID 60S BEHIND FRONT. THE FROPA IS EXPECTED TO SLOW DOWN AND BECOME STATIONARY ACROSS SOUTHERN MARYLAND AND THE PIEDMONT OF VIRGINIA THIS AFTERNOON AND EVENING. THIS BOUNDARY AND THE SHORTWAVE TROUGH OVER THE CAROLINAS WILL ACT AS LIFTING MECHANISMS FOR SHOWERS AND THUNDERSTORMS INTO THE EVENING. AS OF 18Z...SHOWERS HAVE FORMED JUST EAST OF THE BLUE RIDGE IN CENTRAL VIRGINIA AND ALONG THE ALLEGHENY FRONT. ANY SHOWER ACTIVITY NEAR THE BOUNDARY WILL HAVE THE POTENTAIL TO INTENSIFY INTO THUNDERSTORMS. PWAT VALUES IN THE WARM SECTOR AND NEAR THE FRONT ARE AROUND 2 INCHES. SHEAR IS CLOSE TO 30 KNOTS...A LITTLE HIGHER THAN PREVIOUS DAYS AND WILL INCREASE THE DMG WIND THREAT NEAR THE FRONT BUT THE HIGHER SHEAR WILL HELP MOVE STORMS ALONG AND SURPRESS THE THREAT FOR FLASH FLOODING. EITHER WAY DMG AND FLASH FLOODING ARE STILL POSSIBLE IN THIS SATURATED AREA ALONG THE FRONT. WILL HAVE TO WATCH FOR TRAINING STORMS ESPECIALLY IN ALBEMARLE...NELSON AND AUGUSTA COUNTIES WHICH SAW OVER AN INCH OF RAIN IN SPOTS YESTERDAY. ELSEWHERE OR FURTHER NORTH AND WEST...CU FIELD HAS DEVELOPED AND SHOWERS AND ISOLATED THUNDERSTORMS ARE POSSIBLE. UPPER LEVEL TROUGH NEARS OVERNIGHT AND CATCHES UP WITH SHORTWAVE TROUGH AND SFC FRONT. BERMUDA HIGH STRENGTHS AND MOVES WESTWARD DURING THIS TIME. TROUGH BECOMES A CUT OFF LOW THAT BEGINS TO RETROGRADE WESTWARD BY FRIDAY MORNING. THIS WILL PRODUCE UNSETTLED CONDITIONS FOR THE REGION FRIDAY WITH WRAP AROUND SHOWERS. PWATS IN POST FRONTAL AREAS TODAY WILL INCREASE AND SHOWERS WILL MOVE EAST TO WEST THROUGHOUT THE DAY. TEMPS WILL BE WELL BELOW NORMAL FRIDAY AS CLOUDS...NORTHERLY WINDS AND SHOWERS WILL INHIBIT HEATING. && .SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY/... HIGH PRESSURE CONTINUES TO MOVE WESTWARD AND PUSH MOISTURE INTO THE REGION. ROUNDS OF SHOWERS WILL MOVE ACROSS THE MID ATLANTIC INTO SATURDAY. AS THE HIGH MOVES WESTWARD MOISTURE WILL MOVE TO THE MOUNTAINS AND SUBSIDENCE WILL KICK IN OVER AREAS EAST OF THE BLUE RIDGE. EASTERLY FLOW WILL CONTINUE THE BELOW NORMAL TEMP PERIOD. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... IN JULY THE MAJOR WX PROBLEMS WHICH COME TO MIND ARE HIGH HEAT.. SVR STORMS..AND FLSH FLDG. IT APPEARS THAT ALL OF THESE WL BE HELD AT BAY DURG THE XTND PD. IF THE GFS IS TO BE BLVD...THE COMING UPR LVL PATTERN IS SOMEWHAT OF AN ANACHRONISM FOR MID JUL. NRMLY ONE WOULD XPCT TO SEE A SUBTROPICAL HIGH PARKED OFF THE CST BRINGING A STREAM OF WARM MOIST AIR INTO THE MID ALTC WHICH WOULD BRING ABT THE PSBLTY OF AFTN/EVE TSTMS...W/ THE PTNL FOR HEAT INDICES REACHING ADSRY LVL. LAST NGT THE MDLS LOCKED ON TO AN OUT-OF-THE-ORDINARY SOLN OF A CLOSED LOW FORMING OVR THE NE AND RETROGRADING INTO THE MID ALTC. THIS RMNS THE MDL IMPLICATIONS TNGT....W/ THE LOW OVR THE RGN FRI AND SAT. QUSTN THEN BECOMES HOW MUCH PCPN WL BE THE RESULT. NMRCL GDNC HAS DONE QUITE A CHG IN 24 HRS FOR FRI...GOING FM "0 AND 10%" LAS NGT TO "70 AND 80%" TNGT. THIS IN ITSELF IS PRBLY OUT-OF-THE- ORDINARY...AND LEADS ONE TO QUSTN IF THE MDLS REALLY HV A HANDLE ON WHAT MAY TRANSPIRE. FM A SFC STANDPOINT IT LOOKS LK THE BNDRY CRLY SEEN ON W.V. IMGRY WL NOT BE ABLE TO MAKE IT OFF THE CST...AND HV INCRSD CLD CVR FRI...ESPECIALLY IN THE ERN HALF OF THE FCST AREA. HV ADDED CHC POPS E OF THE MTNS AS WELL. LATER SHIFTS CAN EVALUATE NEED TO INCRS FURTHER. ANOTHER EYE OPENER IS THAT NMRCL GNDC HAS ALL STATIONS IN THE 70S FOR HIGH TEMPS FRI. ATTM HV CUT HIGH TEMPS FM PRVS FCST...BUT STILL KEEPING HIGHS ARND 80 E OF THE MTNS. OVR THE WKND THAT LOW IS SUPPOSED TO TRACK SLOWLY TO THE W AS HIGH PRES CENTERED NEAR LONG ISLAND BUILDS INTO THE MID ALTC. THIS WL KEEP THE NRML MID-JUL TROPICAL CHARACTERISTICS AT BAY - XPCT TO SEE HIGHS IN THE 80S W/ LOWS IN THE L70S E OF I-95...60S W. AS NEXT WK PROGRESSES THAT HIGH LOOKS TO TRACK FURTHER S...MOST LKLY CAUSING THAT AIR MASS IN THE MID ATLC TO MODIFY AND BECOME MORE "TYPICAL" W/ INCRSG HEAT AND HUMIDITY. PCPN LOOKS TO BE HELD AT BAY THRU MID WK. && .AVIATION /19Z THURSDAY THROUGH TUESDAY/... COLD FRONT HAS PASSED THROUGH ALL TERMINALS AND NORTHERLY WINDS WILL CONTINUE INTO TONIGHT. SHOWERS AND ISOLATED THUNDERSTORMS WILL BE POSSIBLE. NEAR THE FRONT...CHO MAY SEE STRONGER THUNDERSTORMS WITH HEAVIER RAIN. MVFR/IFR AND GUSTY WINDS ARE POSSIBLE AT CHO THIS AFTERNOON AND EVENING. IFR CIGS ARE POSSIBLE AT CHO FRIDAY MORNING. AN ACTIVE PERIOD CONTINUES THROUGH THE END OF THE WEEK AS SHOWERS MOVE BACK INTO THE AREA. EASTERLY FLOW FORMS SATURDAY AND SHOWERS WILL CONTINUE INTO SAT MORNING. THUNDERSTORMS ARE NTO EXPECTED. && .MARINE... LIGHT NORTHERLY CONDITIONS REPORTED ON THE BAY THIS AFTERNOON. CONDITIONS WILL STAY UNDER SCA CRITERIA. SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS THE LOWER TIDAL POTOMAC AND LOWER BAY THIS AFTERNOON AND EVENING. SMW'S MAY BE WARRENTED IN STRONGER STORMS. SHOWERS MOVE BACK INTO THE REGION FRIDAY NIGHT AS FRONT MOVES NORTHWARD AND MOISTURE MOVES BACK INTO THE AREA. HIGH PRES IS XPCTD TO BUILD INTO THE WATERS OVR THE WKND/INTO NEXT WK. NO PROBS XPCTD. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && SYNOPSIS...HAS NEAR TERM...HAS SHORT TERM...HAS LONG TERM...HAS/ABW AVIATION...HAS/ABW MARINE...HAS/ABW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 345 PM EDT THU JUL 11 2013 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 121000- 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- 345 PM EDT THU JUL 11 2013 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...THIS AFTERNOON AND TONIGHT THUNDERSTORMS ARE LIKELY THIS AFTERNOON AND EVENING FOR THE I-95 CORRIDOR SOUTH OF WASHINGTON DC...SOUTHERN MARYLAND AND SURROUNDING WATERS. A FEW STORMS MAY PRODUCE LOCALLY DAMAGING WIND GUSTS ALONG WITH HEAVY DOWNPOURS THAT COULD LEAD TO LOCALIZED FLASH FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504- WVZ050>053-055-501>506-121000- 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- 345 PM EDT THU JUL 11 2013 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...THIS AFTERNOON AND TONIGHT THUNDERSTORMS ARE LIKELY THIS AFTERNOON AND EVENING EAST OF THE BLUE RIDGE AND SOUTH OF I-66. A FEW STORMS MAY PRODUCE LOCALLY DAMAGING WIND GUSTS ALONG WITH HEAVY DOWNPOURS THAT COULD LEAD TO LOCALIZED FLASH FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.
The Sterling radar (KLWX), 93 km away, was scanning. The volume nearest the first event began at 01:29 UTC.
1 thunderstorm wind. Local standard time, as filed.
There were trees down along Capon Springs Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in West Virginia in 2013Every state in 2013This day in weather historyWarnings in West Virginia, July 2013
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: 471215.