An upper-level disturbance combined with plenty of moisture and an unstable atmosphere to trigger showers and thunderstorms during on the 9th. With locally heavy rain in a short period of time, this lead to isolated areas of flash flooding.
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.
An upper-level disturbance combined with plenty of moisture and an unstable atmosphere to trigger showers and thunderstorms during on the 9th. With locally heavy rain in a short period of time, this lead to isolated areas of flash flooding.
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 Jun 9, 3:56 AM EST, 1 hour 34 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 456 AM EDT TUE JUN 9 2009 .SYNOPSIS... A FRONTAL BOUNDARY WILL MOVE INTO THE MID-ATLANTIC REGION TODAY. SEVERAL DISTURBANCES WILL MOVE ALONG THIS FRONTAL BOUNDARY...KEEPING UNSETTLED CONDITIONS CAN BE EXPECTED PERIODICALLY THROUGH THE REST OF THE WORK WEEK. HIGH PRESSURE WILL BUILD OVER THE AREA LATER FRIDAY AND INTO SATURDAY. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... QUICK UPDATE TO THE FORECAST FOR CURRENT CONDITIONS. REMNANTS OF WEST VIRGINIA CONVECTION HAS COALESCED INTO A WEAK LINE THIS MORNING...STRETCHING FROM EASTERN PA BACK THROUGH SW VIRGINIA. STORMS HAVE CONTINUED TO INCREASE IN COVERAGE...ESPECIALLY OVER THE METRO AREAS THIS MORNING. WILL BE INCREASING THE POPS. STILL THINK THERE WILL BE A BREAK DURING THE LATE MORNING AND EARLY AFTERNOON BETWEEN CONVECTIVE ROUNDS. WOULD NOT BE SURPRISED TO SEE SOME SMALL HAIL OUT OF THIS MORNINGS ACTIVITY. PREVIOUS DISCUSSION FOLLOWS. REMNANTS OF EARLIER CONVECTION OVER WEST VIRGINIA IS NOW APPROACHING THE POTOMAC HIGHLANDS. ADDITIONAL ISOLATED SHOWERS CONTINUE TO DEVELOP ACROSS THE CWFA IN THE MOIST AIRMASS. FURTHER NORTH...STRONGER STORMS HAVE DEVELOPED ACROSS CENTRAL PA AND INTO NEW JERSEY. CLOUD DEBRIS FROM ALL THE CONVECTION HAS SPREAD ACROSS THE CWFA...WITH A LAYER OF CIGS AROUND 10KFT. ALSO NOTED ON THE FOG CHANNEL IS SOME STRATUS OVER THE NORTHERN DELMARVA PUSHING ITS WAY WESTWARD BEHIND A WEAK FRONT. A LEE TROUGH CONTINUES OVER THE CENTRAL CWFA...WITH A FRONTAL BOUNDARY ACROSS SOUTHERN NJ/NORTHERN DELMARVA. A STRONGER COLD FRONT STRETCHES FROM THE CENTRAL GREAT LAKES BACK THROUGH THE MID MISSISSIPPI RIVER VALLEY. CONVECTION IS EXPECTED TO DEVELOP AGAIN TODAY...WITH MORE COVERAGE THAN YESTERDAY...ESPECIALLY EAST OF THE BLUE RIDGE MOUNTAINS. THE ATMOSPHERE REMAINS MOIST...WITH DEWPOINTS IN THE MIDDLE 60S TO NEAR 70. THE GFS SEEMS TO BE MORE UNSTABLE THAN THE NAM...BUT REGARDLESS...ATMOSPHERIC CONDITIONS WILL BE UNSTABLE WHERE PEAK HEATING OCCURS. BOTH THE NAM/GFS HAS THE HIGHEST INSTABILITY EAST OF THE BLUE RIDGE TODAY WITH SURFACE BASED CAPES AROUND 2000 TO 2500 J/KG. IN ADDITION...BOTH MODELS ARE PROGGING STEEP MID LEVEL LAPSE RATES BETWEEN 6.5 AND 7 C/KM. THERE ARE SOME SUBTLE HINTS THAT THE GFS MAY BE SUFFERING FROM SOME CONVECTIVE FEEDBACK. LINGERING ISO/SCT SHOWERS WILL LIKELY CONTINUE EARLY THIS MORNING IN THE POTOMAC HIGHLANDS AND ALONG THE MASON DIXON LINE. THERE MAY BE A BRIEF BREAK IN ANY PRECIP BY MID MORNING...BUT AS TEMPS RISE INTO THE MIDDLE 80S TO NEAR 90...THUNDERSTORMS ARE EXPECTED TO ERUPT. CONVECTION WILL LIKELY FOCUS ALONG THE LEE TROUGH AND PROPAGATE EASTWARD LATER DURING AFTERNOON AND INTO THE EVENING. THIS AGREES FAIRLY WELL WITH THE LOCAL RUN OF THE WRF ARW. THE HIGH RES RUN OF THE HRRR ALSO KEEPS CONVECTION PRETTY MUCH UNDER WRAPS UNTIL AFTER 16Z. THE POTENTIAL FOR SEVERE WEATHER IS MAINLY EXPECTED ALONG AND EAST OF THE BLUE RIDGE MOUNTAINS THIS AFTERNOON/EVENING. ANY SEVERE THUNDERSTORMS THAT DEVELOP WILL BE CAPABLE OF PRODUCING LARGE HAIL...DUE TO THE STEEP LAPSE RATES. BUFKIT SOUNDINGS ALSO SHOW SOME DEEP INVERTED V SOUNDINGS...SO WIND DAMAGE WILL ALSO BE POSSIBLE. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 AM WEDNESDAY/... THE FRONTAL BOUNDARY TO THE WEST WILL CONTINUE TO DROP SOUTHWARD OVERNIGHT. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE WELL INTO THE EVENING HOURS...WITH A FEW LINGERING SHOWERS ESPECIALLY ACROSS LOWER SOUTHERN MARYLAND INTO THE EARLY MORNING HOURS. THE POTENTIAL FOR SEVERE WEATHER WILL CONTINUE INTO THE EARLY EVENING HOURS. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... ACTIVE PATTERN REST OF THE WORK WEEK AS A FRONTAL SYSTEM /UNDER MAINLY ZONAL UPPER FLOW/ UNDULATES ACROSS THE AREA. ANY LINGERING SHOWERS/THUNDERSTORMS WEDNESDAY MORNING SHOULD PUSH EAST OF THE AREA WITH THE COLD FRONT BY LATER MORNING HOURS AS THE NEXT S/W APPROACHES FROM THE WEST. TWO SUCCESSIVE WAVES THURSDAY AND FRIDAY /WITH A FRONT CROSSING THE MID-ATLANTIC ON FRIDAY/ DEPICTED BY BOTH THE 00Z GFS AND 00Z EURO. BROUGHT LIKELY POPS THURSDAY AFTERNOON THROUGH THURSDAY NIGHT TO ACCOUNT FOR THIS MOST ACTIVE SECTION OF THE EXTENDED PERIODS. PWATS THURSDAY/NIGHT AROUND 1.75 INCHES CLIMATOLOGICALLY HIGH...THOUGH GREATER CONCERN FOR FLASH FLOODING WOULD BE PRESENT WITH VALUES AROUND 2 INCHES...WILL HAVE TO MONITOR THE PROGGED DURATION OF HEAVIEST PRECIP ON THURSDAY AS THE WEEK PROGRESSES. TEMPERATURES REMAIN AROUND FIVE DEGREES ABOVE NORMAL /AND HUMIDITY REMAINS RATHER HIGH - UPPER 60S/ UNTIL THE FRONT COMES THROUGH /CURRENTLY PROGGED AROUND MIDDAY FRIDAY/. UNCERTAINTY OF HOW LONG COOLER CONTINENTAL AIR LASTS INTO THE WEEKEND...THE 00Z GFS BRINGS ANOTHER WAVE INTO THE AREA BY LATE SATURDAY WHILE THE 00Z EURO MAINTAINS HIGH PRESSURE INTO EARLY NEXT WEEK. && .AVIATION /09Z TUESDAY THROUGH SATURDAY/... THICK CIRRUS CONTINUES TO OVERSPREAD THE CWFA THIS MORNING DUE TO CONVECTIVE DEBRIS. SOME PATCHY MVFR VSBYS ARE POSSIBLE THROUGH SUNRISE IN PATCHY FOG. SUB VFR CIGS/VSBYS ARE EXPECTED THIS AFTERNOON AS SHOWERS AND THUNDERSTORMS OVERSPREAD THE AREA LATER THIS AFTERNOON AND INTO THE EVENING HOURS AHEAD OF A COLD FRONT. GUSTY WINDS AND HAIL WILL BE POSSIBLE WITH THUNDERSTORMS THIS AFTERNOON/EVE. ACTIVE PATTERN WITH A SUCCESSION OF SHORTWAVES...EXPECT PERIODIC SUBVFR CONDITIONS IN PRECIPITATION THROUGH FRIDAY WITH LATER THURSDAY THROUGH THURSDAY NIGHT AS THE MOST ACTIVE PERIOD. ADDITIONALLY...AMPLE LOW LEVEL MOISTURE MAY ALLOW FOR MORNING SUBVFR VSBYS /PARTICULARLY WHEN CLOUDS CLEAR AT NIGHT AFTER PRECIP/. HIGH PRESSURE BUILDS IN LATER FRIDAY FOR AT LEAST THE EARLY PART OF THE WEEKEND AFTER A FRIDAY FROPA. && .MARINE... LIGHT WINDS EXPECTED ON THE WATERS THROUGH TONIGHT. SPECIAL MARINE WARNINGS ARE POSSIBLE FOR HAIL AND/OR GUSTY WINDS LATER THIS AFTERNOON AND INTO THE EVENING HOURS. THUNDERSTORMS ARE POSSIBLE WEDNESDAY THRU FRIDAY /PARTICULARLY IN THE AFTERNOONS AND EVENINGS/ AS A FRONTAL BOUNDARY UNDULATES THRU THE AREA. THE POTENTIAL FOR A SMALL CRAFT ADVISORY THURSDAY AFTERNOON/EVENING HAS DIMINISHED WITH THE LATEST GUIDANCE...HOWEVER THE POTENTIAL FOR AN SCA DEPENDS ON HOW STRONG THE WAVES OF LOW PRESSURE RIDING ALONG THE FRONTAL ZONE BECOME. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && LISTEMAA/BAJ
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 510 AM EDT TUE JUN 9 2009 ANZ530>537-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 101000- 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-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- 510 AM EDT TUE JUN 9 2009 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...TODAY AND TONIGHT A COLD FRONT WILL MOVE SOUTH OVER THE MID ATLANTIC TODAY. THIS FRONT WILL BRING SHOWERS AND THUNDERSTORMS TO THE REGION...WITH THE POTENTIAL FOR SEVERE WEATHER. SOME THUNDERSTORMS MAY BECOME SEVERE...PRODUCING LARGE HAIL AND DAMAGING WIND GUSTS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY ADDITIONAL THUNDERSTORMS CAN BE EXPECTED WEDNESDAY AND THURSDAY. THERE MAY BE A RISK OF SEVERE WEATHER EACH DAY MAINLY DURING THE AFTERNOON AND EVENING HOURS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON. MDZ003>005-009-010-501-502-VAZ021-025>031-036>042-050-051- WVZ050>055-501>504-101000- WASHINGTON-FREDERICK MD-CARROLL-MONTGOMERY-HOWARD- 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-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-PENDLETON- HARDY-WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL- 510 AM EDT TUE JUN 9 2009 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...TODAY AND TONIGHT A COLD FRONT WILL DROP SOUTH OVER THE MID ATLANTIC TODAY. THIS FRONT WILL BRING SHOWERS AND THUNDERSTORMS TO THE REGION...WITH THE POTENTIAL FOR SEVERE WEATHER. SOME THUNDERSTORMS MAY BECOME SEVERE...PRODUCING LARGE HAIL AND DAMAGING WIND GUSTS ESPECIALLY EAST OF THE BLUE RIDGE MOUNTAINS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY ADDITIONAL THUNDERSTORMS CAN BE EXPECTED WEDNESDAY AND THURSDAY. THERE MAY BE A RISK OF SEVERE WEATHER EACH DAY MAINLY DURING THE AFTERNOON AND EVENING HOURS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 459 AM EDT TUE JUN 9 2009 VAZ028-031-WVZ052-053-090945- CLARKE VA-JEFFERSON WV-BERKELEY WV-FREDERICK VA- 459 AM EDT TUE JUN 9 2009 ...STRONG THUNDERSTORMS TO AFFECT CLARKE...JEFFERSON...BERKELEY AND FREDERICK COUNTIES... AT 459 AM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 4 MILES WEST OF BERRYVILLE...MOVING NORTHEAST AT 10 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE BERRYVILLE...CHARLES TOWN AND RANSON. WIND GUSTS OF 30 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. HEAVY DOWNPOURS MAY REDUCE VISIBILITY BELOW A MILE AND CAUSE PONDING OF WATER ON ROADWAYS. BAJ
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 523 AM EDT TUE JUN 9 2009 VAZ041-050>052-091000- ORANGE VA-CULPEPER VA-FAUQUIER VA- PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- 523 AM EDT TUE JUN 9 2009 ...STRONG THUNDERSTORMS TO AFFECT ORANGE...CULPEPER...FAUQUIER AND PRINCE WILLIAM/MANASSAS/MANASSAS PARK COUNTIES... AT 520 AM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS STRETCHING FROM CULPEPER TO WARRENTON VIRGINIA. ADDITIONAL STORMS WERE DEVELOPING ACROSS ORANGE COUNTY NEAR BURR HILL. STORMS WILL MOVE NORTHEAST AROUND 15 MPH. THE STORMS ACROSS FAUQUIER COUNTY ARE EXPECTED TO MOVE INTO WESTERN PRINCE WILLIAM COUNTY WITHIN THE NEXT THIRTY MINUTES. THESE STORMS WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 40 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE CULPEPER...BEALETON AND WARRENTON. LISTEMAA
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 533 AM EDT TUE JUN 9 2009 VAZ053-091015- FAIRFAX VA- 533 AM EDT TUE JUN 9 2009 ...STRONG THUNDERSTORMS TO AFFECT FAIRFAX COUNTY... AT 533 AM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER RESTON...MOVING EAST AT 25 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE WOLF TRAP...GREAT FALLS...VIENNA...MERRIFIELD...TYSONS CORNER...THE I66 AND I495 INTERCHANGE AND MCLEAN. WIND GUSTS OF 40 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. HEAVY DOWNPOURS MAY REDUCE VISIBILITY BELOW A MILE AND CAUSE PONDING OF WATER ON ROADWAYS. BAJ
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 546 AM EDT TUE JUN 9 2009 VAZ041-042-052-091030- FAUQUIER VA-LOUDOUN VA-PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- 546 AM EDT TUE JUN 9 2009 ...STRONG THUNDERSTORMS TO AFFECT FAUQUIER...LOUDOUN AND PRINCE WILLIAM/MANASSAS/MANASSAS PARK COUNTIES... AT 546 AM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER BROAD RUN...MOVING EAST AT 20 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE HAYMARKET...BULL RUN...ARCOLA AND DULLES INTERNATIONAL AIRPORT. WIND GUSTS OF 30 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. BAJ
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 559 AM EDT TUE JUN 9 2009 MDZ009-010-013-014-091045- HOWARD MD-MONTGOMERY MD-ANNE ARUNDEL MD-PRINCE GEORGES MD- 559 AM EDT TUE JUN 9 2009 ...STRONG THUNDERSTORMS TO AFFECT HOWARD...MONTGOMERY...ANNE ARUNDEL AND PRINCE GEORGES COUNTIES... AT 559 AM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 2 MILES EAST OF EDNOR...MOVING EAST AT 20 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE LAUREL...COLUMBIA...FORT MEADE...ODENTON AND MILLERSVILLE. WIND GUSTS OF 40 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. BAJ
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 624 AM EDT TUE JUN 9 2009 MDZ013-016-VAZ041-050>053-055>057-091115- PRINCE GEORGES MD-ORANGE VA-KING GEORGE VA-STAFFORD VA-CULPEPER VA- FAUQUIER VA-CHARLES MD-SPOTSYLVANIA VA- PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA-FAIRFAX VA- 624 AM EDT TUE JUN 9 2009 ...STRONG THUNDERSTORMS TO AFFECT PRINCE GEORGES...ORANGE...KING GEORGE...STAFFORD...CULPEPER...FAUQUIER...CHARLES...SPOTSYLVANIA... PRINCE WILLIAM/MANASSAS/MANASSAS PARK AND FAIRFAX COUNTIES... AT 624 AM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM FORT BELVOIR TO 2 MILES NORTHEAST OF AQUIA TO GOLD DALE...MOVING SOUTHEAST AT 15 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THESE STORMS INCLUDE INDIAN HEAD...STAFFORD...ST. CHARLES...WALDORF...LA PLATA...MASSAPONAX AND DAHLGREN. WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. LISTEMAA
The Sterling radar (KLWX), 36 km away, was scanning. The volume nearest the first event began at 10:28 UTC.
2 flash flood. Local standard time, as filed.
Beach Drive was closed between the Kensington Parkway and Beltway due to a water rescue from flash flooding.
Flash flooding was reported along a creek near Victory Villa Elementary School.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2009Every state in 2009This day in weather historyWarnings in Maryland, June 2009
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: 171991, 171992.