An unstable atmosphere lead to the development of scattered showers and thunderstorms across Maryland. Some thunderstorms did become severe, producing damaging winds and large hail.
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 unstable atmosphere lead to the development of scattered showers and thunderstorms across Maryland. Some thunderstorms did become severe, producing damaging winds and large 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 Jun 20, 10:28 AM EST, 3 hours 50 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1128 AM EDT SAT JUN 20 2009 .SYNOPSIS... A COLD FRONT WILL MOVE ACROSS THE MID ATLANTIC THIS AFTERNOON AND EVENING...WITH A RISK OF THUNDERSTORMS. DRIER AIR WILL FILTER INTO THE AREA SUNDAY INTO EARLY NEXT WEEK. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... VERY BUSY MORNING WITH NUMEROUS SHOWERS AND TSTMS ACROSS THE AREA WHILE OUR RADAR IS DOWN. SCATTERED TSTMS CONTINUE TO DEVELOP UPSTREAM ACROSS THE APPALACHIANS AND RACE EWD ACROSS THE CWA. ACTIVITY THIS MORNING HAS LED TO OVC SKIES ACROSS THE AREA...WHICH WILL LIMIT OUR DAYTIME HEATING AND DESTABILIZATION. HOWEVER...VIS SAT IMAGERY DOES SHOW SOME BREAKS ACROSS WV AND OH. LATEST THINKING IS MORE CONVECTIVE ACTIVITY SHOULD DEVELOP THIS AFTERNOON. MODIFIED IAD RAOB SHOW 35 KT OF DEEP LAYER SHEAR...WHICH IS FCSTD TO INCREASE A BIT AS THE LLJ MOVES OVER THE REGION...AND MLCAPE VALUES OF GREATER THAN 2000 J/KG BY THIS AFTERNOON WILL SUPPORT SEVERE TSTMS WITH STRAIGHT LINE WIND DAMAGE BEING THE MAIN THREAT. HOWEVER ISOLATED LARGE HAIL AND EVEN A TORNADO IS POSSIBLE. EXPECT ACTIVITY THIS AFTERNOON TO ORGANIZE INTO A LINE SEGMENT AHEAD OF THE APPROACHING SHORTWAVE TROUGH/COLD FRONT. MORNING IAD RAOB SHOW PWAT VALUES OF 2.1 INCHES WHICH IS +2 SD ABOVE NORMAL FOR MID JUNE. THEREFORE VERY HEAVY RAINFALL IS POSSIBLE WITH STORMS TODAY...BUT THE FLASH FLOODING THREAT SHOULD BE LOCALIZED/ISOLATED DUE TO VERY FAST STORM MOTION. LOWERED MAX TEMPS A FEW DEGREES FROM PREV FCST WITH CLD COVER IN PLACE. WINDS SHOULD ALSO PICK UP THIS AFTERNOON WITH SYNOPTIC GUSTS TO 25 KT POSSIBLE AS THE LLJ MOVES OVERHEAD. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 AM SUNDAY/... COLD FRONT WILL MOVE ACROSS THE CWA THIS EVENING...FOLLOWED BY AN UPPER TROUGH PASSAGE. CONVECTION WILL SHUT OFF DURING THE EARLY EVENING HOURS...ALTHOUGH PLENTY OF CLOUDS WILL LIKELY LINGER INTO THE OVERNIGHT HOURS. && .LONG TERM /SUNDAY THROUGH FRIDAY/... DRIER CONDITIONS IN THE WAKE OF COLD FRONT TO FINISH THE WEEKEND. STACKED LOW STALLS SEVERAL HUNDRED MILES OFF THE MID ATLANTIC COAST ON SUNDAY...WHERE IT WILL REMAIN THROUGH WEDNESDAY. THIS PUTS THE AREA IN UNSEASONABLY STRONG NORTHERN FLOW FOR SEVERAL DAYS. AS THE LOW STRENGTHENS SUNDAY...PRESSURE GRADIENT AND AMPLE MIXING DOWN OF STRONGER WINDS ALOFT SHOULD MAKE FOR A BREEZY DAY...15 TO 25 KTS WITH HIGHER GUSTS. LOW LEVELS WILL BE SCOURED OF MOISTURE...BUT MID LEVEL MOISTURE/VORTICITY ROTATING AROUND THE LOW MAY KEEP SIGNIFICANT CLOUD COVER OVER THE AREA...PARTICULARLY EASTERN ZONES. PRESSURE GRADIENT BROADENS BY MONDAY...BUT NORTHERLY FLOW SHOULD CONTINUE THROUGH WEDNESDAY...KEEP WEATHER RELATIVELY QUIET AND THE RELATIVE HUMIDITY LOW. HAVENT COMPLETELY REMOVED POPS...AS THERE ARE INDICATIONS OF SEVERAL MINOR DISTURBANCES ROTATING AROUND THE LOW...BUT ONLY LOW CHANCES ARE WARRANTED ATTM. WEDNESDAY...LOW FINALLY BEGINS TO BE PUSHED FURTHER OFFSHORE BY APPROACHING SHORTWAVE...WHICH SHOULD MOVE ACROSS THE AREA THURSDAY NIGHT AND FRIDAY. RETURN FLOW MAY NOT BE SUFFICIENT TO PRODUCE MUCH IN THE WAY OF PRECIPITATION WITH THIS DISTURBANCE...SO ONLY CHANCE POPS FOR THE END OF THE EXTENDED. TEMPERATURES REMAIN SEASONAL THROUGHOUT...WITH LOW 80S MAXIMA AND 50S TO LOW 60S MINIMA ON SUNDAY...SLOWLY INCHING TOWARD UPPER 80S BY MID WEEK. && .AVIATION /15Z SATURDAY THROUGH WEDNESDAY/... TSTMS WILL CONT TO MOVE ACROSS IAD/DCA/MTN/BWI DURING THE LATE MORNING. ANOTHER ROUND OF CONVECTION IS EXPECTED TO DEVELOP THIS AFTERNOON. ULTIMATELY...A FRONT WILL MOVE THROUGH THE AREA LATE TODAY...ENDING CONVECTION CHANCES AND INSTIGATING A WIND SHIFT FROM SOUTH/SOUTHWEST TO WEST. ONLY SLIGHT CHANCES OF PRECIPITATION THROUGH EARLY NEXT WEEK...ALTHOUGH SIGNIFICANT CLOUD COVER MAY PASS OVER AIRPORTS FORM TIME TO TIME. THIS SHOULD BE HIGH ENOUGH TO KEEP CONDITIONS VFR THROUGHOUT. GUSTY NORTHERLY WINDS BEHIND A COLD FRONT ON SUNDAY INTO SUNDAY NIGHT MAY GUST OVER 30 KT. && .MARINE... SCA IN EFFECT FROM 2 PM UNTIL SUN EVENING. DEBATED WHETHER TO ISSUE A GALE WARNING FOR TONIGHT AND POSSIBLY INTO SUN...BUT WILL HOLD OFF UNTIL THE 12Z GUIDANCE COMES IN. 06Z NAM GUIDANCE SUPPORTS 40 KT WIND GUSTS OVER THE CHES BAY AFTER 22Z TODAY WHILE OTHER MODELS ARE MORE CONSERVATIVE. PREVIOUS DISCUSSION.... SMALL CRAFT ADVISORY WILL BE IN EFFECT LATE THIS AFTERNOON AND TONIGHT JUST AHEAD AND THEN BEHIND A COLD FRONT. IN ADDITION...CONVECTION TODAY MAY PRODUCE GUSTY WINDS ACROSS THE WATERS BUT CONVECTION WILL BE SHUT OFF EARLY THIS EVENING WITH THE FRONTAL PASSAGE. LOW PRESSURE STALLS OFF THE MID ATLANTIC SEABOARD...WHICH WILL BRING DRIER BUT GUSTY NORTH WINDS TO THE WATERS SUNDAY. SCA POSTED WITH GUSTS NEAR 30 KT POSSIBLE. NORTH WINDS CONTINUE THROUGH EARLY NEXT WEEK...AND DEPENDING ON THE STRENGTH AND POSITION OF THE ATLANTIC LOW...SMALL CRAFT CONDITIONS ARE POSSIBLE. && .EQUIPMENT... WSR-88D IS STILL DOWN DUE TO A FAULTY PART. SHOULD RECIEVE PART SOMETIME THIS AFTERNOON AND HOPEFULLY BE BACK UP LATER THIS AFTERNOON OR EARLY EVENING. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 7 PM EDT SUNDAY FOR ANZ530>537. && UPDATE...KLEIN PREV DISC...BPP/SBK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1145 AM EDT SAT JUN 20 2009 ANZ530>537-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 211000- 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- 1145 AM EDT SAT JUN 20 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...THIS AFTERNOON AND TONIGHT NUMEROUS THUNDERSTORMS WILL MOVE ACROSS THE OUTLOOK AREA THROUGH THIS AFTERNOON. SOME THUNDERSTORMS MAY BE SEVERE...PRODUCING DAMAGING WIND GUSTS AND LARGE HAIL. HEAVY RAINFALL IS ALSO POSSIBLE...WHICH COULD PRODUCE LOCALIZED FLASH FLOODING. THE MOST LIKELY TIME FOR SEVERE WEATHER IS THROUGH 4 PM. A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE TIDAL POTOMAC RIVER AND MARYLAND CHESAPEAKE BAY 2 PM THIS AFTERNOON INTO TONIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A SMALL CRAFT ADVISORY CONTINUES ACROSS THE WATERS SUNDAY AND SUNDAY EVENING. THE SMALL CRAFT ADVISORY MAY NEED TO BE EXTENDED INTO SUNDAY NIGHT AND MONDAY. .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>504-211000- 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- 1145 AM EDT SAT JUN 20 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...THIS AFTERNOON AND TONIGHT NUMEROUS THUNDERSTORMS WILL MOVE ACROSS THE OUTLOOK AREA THROUGH THIS AFTERNOON. SOME THUNDERSTORMS MAY BE SEVERE...PRODUCING DAMAGING WIND GUSTS AND LARGE HAIL. HEAVY RAINFALL IS ALSO POSSIBLE...WHICH COULD PRODUCE LOCALIZED FLASH FLOODING. THE MOST LIKELY TIME FOR SEVERE WEATHER IS THROUGH 3 PM. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1023 AM EDT SAT JUN 20 2009 VAZ041-042-052-053-201500- FAUQUIER VA-LOUDOUN VA-PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- FAIRFAX VA- 1023 AM EDT SAT JUN 20 2009 ...STRONG THUNDERSTORM TO AFFECT FAUQUIER...LOUDOUN...PRINCE WILLIAM/MANASSAS/MANASSAS PARK AND FAIRFAX COUNTIES... AT 1021 AM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM AROUND MARSHALL IN NORTHERN FAUQUIER COUNTY...MOVING EAST AT 40 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE MIDDLEBURG... HAYMARKET...ARCOLA...DULLES AIRPORT... CENTREVILLE... CHANTILLY... HERNDON... OAKTON...RESTON...WOLF TRAP AND VIENNA. WIND GUSTS OF 40 TO 50 MPH...SMALL HAIL...AND BRIEF TORRENTIAL RAIN IS EXPECTED WITH THIS STORM. STRONG
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1104 AM EDT SAT JUN 20 2009 DCZ001-MDZ009-VAZ042-053-054-201545- DISTRICT OF COLUMBIA DC-MONTGOMERY MD-LOUDOUN VA- ARLINGTON/FALLS CHURCH/ALEXANDRIA VA-FAIRFAX VA- 1104 AM EDT SAT JUN 20 2009 ...STRONG THUNDERSTORMS TO AFFECT THE DISTRICT OF COLUMBIA AND THE NORTHWEST SUBURBS... AT 11 AM EDT...A STRONG THUNDERSTORM WAS OVER WOLF TRAP AND GREAT FALLS...MOVING RAPIDLY EAST AT 50 MPH. AT THE SAME TIME ANOTHER STRONG STORM WAS OVER WESTERN MONTGOMERY COUNTY MOVING EAST. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THESE STRONG STORMS INCLUDE BETHESDA...CHEVY CHASE...AMERICAN UNIVERSITY... GEORGETOWN... WASHINGTON... ROCKVILLE...OLNEY...AND NORTH ARLINGTON. WIND GUSTS OF 40 MPH...SMALL HAIL...AND TORRENTIAL RAIN IS EXPECTED WITH THESE STORMS. STRONG
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1201 PM EDT SAT JUN 20 2009 MDZ016-017-VAZ057-201630- KING GEORGE VA-CHARLES MD-ST. MARYS MD- 1201 PM EDT SAT JUN 20 2009 ...STRONG THUNDERSTORM TO AFFECT KING GEORGE...CHARLES AND ST. MARYS COUNTIES... AT NOON...A STRONG THUNDERSTORM WAS NEAR BEL ALTON AND PORT TOBACCO... MOVING EAST AT 40 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE LEONARDTOWN... NEWBURG... FAULKNER... DAHLGREN... AND CHAPTICO. BRIEF TORRENTIAL RAIN... FREQUENT LIGHTNING...WIND GUSTS UP TO 45 MPH... AND SMALL HAIL ARE EXPECTED WITH THIS STORM. STRONG
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 235 PM EDT SAT JUN 20 2009 VAZ041-050-051-055-056-201915- ORANGE VA-STAFFORD VA-CULPEPER VA-FAUQUIER VA-SPOTSYLVANIA VA- 235 PM EDT SAT JUN 20 2009 ...STRONG THUNDERSTORMS TO AFFECT ORANGE...STAFFORD...CULPEPER... FAUQUIER AND SPOTSYLVANIA COUNTIES... AT 235 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES SOUTHWEST OF GOLDVEIN...MOVING SOUTHEAST AT 20 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE MASSAPONAX. 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 302 PM EDT SAT JUN 20 2009 MDZ006-007-011-201945- NORTHERN BALTIMORE MD-HARFORD MD-SOUTHERN BALTIMORE MD- 302 PM EDT SAT JUN 20 2009 ...STRONG THUNDERSTORMS TO AFFECT NORTHERN BALTIMORE...HARFORD AND SOUTHERN BALTIMORE COUNTIES... AT 302 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 2 MILES WEST OF COCKEYSVILLE...MOVING SOUTHEAST AT 25 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE TIMONIUM...LUTHERVILLE...EUDOWOOD...LOCH RAVEN...HAMPTON...LOCH RAVEN VILLAGE...CARNEY...GLEN ARM...PARKVILLE AND PERRY HALL. WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. BAJ
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 306 PM EDT SAT JUN 20 2009 MDZ016-017-VAZ055>057-201945- KING GEORGE VA-STAFFORD VA-CHARLES MD-ST. MARYS MD-SPOTSYLVANIA VA- 306 PM EDT SAT JUN 20 2009 ...STRONG THUNDERSTORMS TO AFFECT KING GEORGE...STAFFORD...CHARLES... ST. MARYS AND SPOTSYLVANIA COUNTIES... AT 306 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 2 MILES WEST OF CHAPTICO TO WHITE OAK...MOVING SOUTHEAST AT 30 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THESE STORMS INCLUDE LEONARDTOWN...HOLLYWOOD...LEXINGTON PARK...CALIFORNIA...PATUXENT RIVER NAS...SAINT MARYS RIVER AND SAINT INIGOES CREEK. WIND GUSTS OF 40 MPH AND SMALL HAIL CAN BE EXPECTED WITH THESE STORMS. BAJ
The national radar mosaic for the moment the first event began.
3 thunderstorm wind, 2 tornado, 1 hail. Local standard time, as filed.
Several trees were snapped. A tree also fell onto a house near Swan Point.
A tree two diameter in feet fell across Highway 257.
Trees were down near Cobb Island.
National Weather Service survey indicated an EF-0 tornado touched down near Pleasant Hills before dissipating near the Atkisson Resorvoir. Peak wind speeds were estimated around 75 mph.
Several trees were down in Pleasant Hills and also near the intersection of Hollingsworth Drive and Ring Factory Road.
Half dollar size hail was reported near Middle River.
National Weather Service survey indicated that a tornado touched down near Essex as an EF-0. Peak winds were estimated around 70 mph. Several trees were down and there was minor shingle and siding damage reported throughout the community of Essex.
The tornado intensified as it approached Browns Creek and Balliston Point. The tornado uprooted or snapped down a significant portion of large trees in the community along Island View Road. The tornado across this area was classified as an EF-1 with peak winds of 90 mph. The tornado finally weakened as it moved over the Bay.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2009Every state in 2009This day in weather historyThe tornado archive for Maryland, 2009Warnings 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: 180991, 180984, 180987, 181438, 180992, 181441.