A weak frontal boundary remained draped across the Mid Atlantic for several days at the end of May. Scattered showers and thunderstorms developed in a warm and unstable airmass on May 27th.
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 weak frontal boundary remained draped across the Mid Atlantic for several days at the end of May. Scattered showers and thunderstorms developed in a warm and unstable airmass on May 27th. Some of these storms became severe, producing damaging winds across northern and central Maryland.
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 May 27, 5:28 PM EST, 12 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 628 PM EDT SUN MAY 27 2007 .SYNOPSIS... ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP IN THE AFTERNOON AND EARLY EVENING THROUGH MONDAY IN ASSOCIATION WITH A COLD FRONT MOVING FROM NORTH TO SOUTH ON MONDAY. HIGH PRESSURE WILL REGAIN CONTROL OF THE MID ATLANTIC THROUGH THE END OF THE WORK WEEK. A COLD FRONT IS EXPECTED TO AFFECT THE REGION DURING THE WEEKEND. && .NEAR TERM /UNTIL 10 PM THIS EVENING/... MESOSCALE CLUSTER HAS MVD INTO WRN BURBS OF DC. HV BEEN GETTING A FAIR AMT OF VERIFYING REPORTS BACK...BOTH WND DAMAGE AND LARGE HAIL. SEE LSRLWX. CLUSTER HAS KICKED OUT AN OUTFLOW...BUT INDIV STORMS SHOWING SIGNS OF RDVLPMNT. HV CLRD WATCH W OF ONGOING ACTVTY. UPDTS OUT. && .SHORT TERM /10 PM THIS EVENING THROUGH 6 PM MONDAY/... THE COLD FRONT WILL ENTER THE NORTHERN FORECAST AREA EARLY MONDAY MORNING...WIND SHIFTS FROM THE WEST AND NORTHWEST BY 12Z AT MARTINSBURG...AND BE ACROSS THE SOUTHERN FORECAST AREA BY 18Z...WIND SHIFT AT CHARLOTTESVILLE AROUND 16Z. THE MODELS ARE UNFORTUNATELY IN LESS AGREEMENT WITH THE FRONT BY MORNING. THE GFS BRINGS IT THROUGH PRETTY DRY WHILE THE NAM SHOWS QPF ACROSS THE NORTHERN HALF OF THE FORECAST AREA BY 12Z. LOCALLY RUN WRF-ARW IS IN CLOSER AGREEMENT TO THE NAM. HAVE INCLUDED ISOLATED POPS OVERNIGHT AND INTO MORNING FOR THE NORTH. ONCE THE FRONT MAKES IT FURTHER SOUTH...THE FOCUS OF ANY CONVECTION WILL SHIFT ACCORDINGLY. HOWEVER...GIVEN ANY LINGERING BOUNDARIES FROM MORNING ACTIVITY AND DIFFERENCES IN TIMING AMONGST THE MODELS...HAVE A BLANKET SCATTERED POP FOR THE ENTIRE FORECAST AREA FOR THE AFTERNOON. TEMPERATURES OVERNIGHT WILL BE RELATIVELY WARM..ESPECIALLY GIVEN HIGHER DEW POINTS TODAY. TEMPERATURES WILL BE SLIGHTLY COOLER TOMORROW WITH THE COLD FRONT. MOS GUIDANCE WAS CLUSTERED...SO TOOK A BLEND FOR OVERNIGHT LOWS AND DAYTIME HIGHS. && .LONG TERM /MONDAY NIGHT THROUGH SUNDAY/... GENERALLY WEAK FLOW...RIDGING AND DIURNALLY DRIVEN CONVECTIVE DEVELOPMENT IN THE FAVORED AREAS EXPECTED TO CONTINUE INTO MID WEEK WITH ONLY VERY LOW POPS MAINTAINED. NEXT SYS OF MORE SIGNIFICANCE XPCTD LATE IN THE WEEK AS SHORTWAVE TROF ROTATES THROUGH THE MID ATLC BRINGING A COLD FRONT WITH IT LATE FRIDAY. NEXT COLD FRONT WILL BE INTERESTING TO WATCH AS PLENTY OF DEEP MOISTURE WILL MOVE NORTH IN ADVANCE OF IT. MODEL INDICATIONS IN THE MEDIUM RANGE STILL SUGGESTING MORE TROFFING OVER THE EASTERN CONUS DEVELOPING NEXT WEEKEND AS STRONG RIDGE BUILDS OVER THE INTERMOUNTAIN REGION OF THE WEST. && .AVIATION /00Z MONDAY THROUGH FRIDAY/... SCATTERED SHOWERS AND THUNDERSTORMS EXPECTED THROUGH AROUND 00Z. DUE TO SCATTERED COVERAGE...WILL CONTINUE MENTION OF VCTS AND CB IN CLOUD GROUP. AS STORMS BECOME BETTER ORGANIZED...WILL AMEND ACCORDINGLY WITH MORE SPECIFICS. SLIGHT CHANCE FOR SHOWERS AT KMRB OVERNIGHT AS THE COLD FRONT NEARS THE MASON DIXON LINE. NOT CONFIDENT ENOUGH TO INCLUDE A MENTION IN THE TAF AT THIS POINT. THE COLD FRONT WILL PROGRESS SOUTH TOMORROW MORNING...ARRIVING AT KCHO BETWEEN 16 AND 20Z. HAVE TIMED NORTHWEST WIND SHIFT AS 12Z AT KMRB...AND BE AT KCHO AROUND 16Z. ISOLATED TO SCATTERED THUNDERSTORMS EXPECTED TOMORROW AFTERNOON...ESPECIALLY CLOSER TO THE FRONT. THROUGH THE END OF THE WEEK...ISOLATED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE DURING THE AFTERNOON HOURS. && .MARINE... SOUTHERLY FLOW INCREASES LATER THIS EVENING. MOS GUIDANCE FOR WINDS IS LOWER THAN PREVIOUS RUNS...SO WILL CAP WINDS OVER THE SOUTHERN BAY AT 15 KNOTS. TIDES RUNNING CLOSE TO PREDICTED. WINDS WILL REMAIN BELOW SMALL CRAFT ADVISORY CRITERIA THROUGH THE END OF THE WORK WEEK. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && SYNOPSIS...SAR NEAR TERM...HTS SHORT TERM...SAR LONG TERM...DRM AVIATION...SAR MARINE...SAR
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 100 PM EDT SUN MAY 27 2007 ANZ530>537-DCZ001-MDZ003>007-009>011-013-014-016>018-501-502- VAZ021-025>031-036>042-050>057-WVZ050>055-501>504-281000- 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- 100 PM EDT SUN MAY 27 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 SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON ACROSS THE REGION. THE ATMOSPHERE IS VERY MOIST AND UNSTABLE ACROSS MUCH OF THE REGION. A FEW SEVERE THUNDERSTORMS ARE EXPECTED THIS AFTERNOON MAINLY BETWEEN 4 AND 8 PM. THE AREA MOST LIKELY TO SEE SEVERE WEATHER TODAY IS ALONG AND SOUTH OF A LINE FROM BALTIMORE MD TO HARRISONBURG VIRGINIA. THE PRIMARY RISK FROM ANY SEVERE THUNDERSTORMS THIS AFTERNOON WILL BE DAMAGING WINDS. LOCALLY HEAVY RAINFALL IS ALSO POSSIBLE FROM THE STRONGER STORMS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE POTENTIAL FOR ISOLATED SEVERE THUNDERSTORMS WILL CONTINUE OVER THE REGION IN THE AFTERNOON AND EARLY EVENING EACH DAY THROUGH THE MIDDLE OF NEXT WEEK. THE BEST CHANCE FOR SEVERE WEATHER IS EXPECTED ON MONDAY ACROSS THE SHENANDOAH VALLEY AND CENTRAL VIRGINIA AS A COLD FRONT MOVES THROUGH THE REGION...WITH LESS OF A CHANCE TUESDAY AND WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EARLY EVENING. MANNING
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
534 PM EDT SUN MAY 27 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0250 PM TSTM WND DMG CHARLOTTESVILLE 38.04N 78.49W
05/27/2007 CITY OF CHARLOTTES VA EMERGENCY MNGR
TREES DOWN ON POWER LINES AND POWER LINES DOWNED IN THE
CITY OF CHARLOTTESVILLE. POWER OUT EARLIER ON EMMITT
STREET NOW RESTORED.
&&
SARPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
607 PM EDT SUN MAY 27 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0524 PM HAIL BERRYVILLE 39.15N 77.98W
05/27/2007 M0.75 INCH CLARKE VA NWS EMPLOYEE
PENNY SIZE HAIL REPORTED IN BERRYVILLE
&&
SARSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 614 PM EDT SUN MAY 27 2007 MDZ004-272245- FREDERICK MD- 614 PM EDT SUN MAY 27 2007 ...STRONG THUNDERSTORMS TO AFFECT FREDERICK COUNTY... AT 614 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 2 MILES SOUTHEAST OF ARNOLDTOWN...MOVING EAST AT 25 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 50 MPH. THE COMMUNITIES OF BRADDOCK HEIGHTS...BALLENGER CREEK...FREDERICK... WALKERSVILLE...NEW MARKET AND GREEN VALLEY WILL BE AFFECTED BY THIS STORM. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE WARNINGS ARE ISSUED. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT. MANNING
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 616 PM EDT SUN MAY 27 2007 VAZ052-272245- PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- 616 PM EDT SUN MAY 27 2007 ...STRONG THUNDERSTORMS TO AFFECT SOUTHERN PRINCE WILLIAM COUNTY... AT 616 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 2 MILES EAST OF MONTCLAIR...MOVING NORTHEAST AT 20 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 50 MPH. THE COMMUNITIES OF LAKE RIDGE WILL BE AFFECTED BY THIS STORM. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE WARNINGS ARE ISSUED. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT. MANNING
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
626 PM EDT SUN MAY 27 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0250 PM TSTM WND DMG CHARLOTTESVILLE 38.04N 78.49W
05/27/2007 CITY OF CHARLOTTES VA EMERGENCY MNGR
TREES DOWN ON POWER LINES AND POWER LINES DOWNED IN THE
CITY OF CHARLOTTESVILLE. POWER OUT EARLIER ON EMMITT
STREET NOW RESTORED.
0315 PM TSTM WND DMG 2 NW BROADWAY 38.63N 78.82W
05/27/2007 ROCKINGHAM VA COUNTY OFFICIAL
TREE DOWN ON ROUTE 259 NORTHWEST OF BROADWAY.
0347 PM TSTM WND DMG 1 W MOUNT JACKSON 38.75N 78.66W
05/27/2007 SHENANDOAH VA COUNTY OFFICIAL
TREE DOWN ON MOUNT JACKSON ROAD BETWEEN SOUTH MIDDLE ROAD
AND TISINGER ROAD.
0426 PM TSTM WND DMG PINE GROVE 38.54N 78.48W
05/27/2007 PAGE VA EMERGENCY MNGR
SEVERAL TREES DOWN IN PINE GROVE.
0439 PM HAIL PINE GROVE 38.54N 78.48W
05/27/2007 M0.75 INCH PAGE VA COUNTY OFFICIAL
PENNY-SIZE HAIL REPORTED IN PINE GROVE
0445 PM TSTM WND DMG WOODVILLE 38.61N 78.18W
05/27/2007 RAPPAHANNOCK VA COUNTY OFFICIAL
TREE DOWN AT ROUTE 620 AND FIVE FORKS ROAD
0452 PM TSTM WND DMG FRONT ROYAL 38.92N 78.18W
05/27/2007 WARREN VA LAW ENFORCEMENT
A LARGE LIMB FELL ON A TRANSFORMER AND DOWNED POWER LINES
IN FRONT ROYAL. POWER OUT IN THE EASTERN PART OF THE
CITY.
0510 PM HAIL WARRENTON 38.72N 77.80W
05/27/2007 E0.88 INCH FAUQUIER VA AMATEUR RADIO
NICKEL SIZE HAIL REPORTED IN WARRENTON.
0524 PM HAIL BERRYVILLE 39.15N 77.98W
05/27/2007 M0.75 INCH CLARKE VA NWS EMPLOYEE
PENNY SIZE HAIL REPORTED IN BERRYVILLE
&&
SARSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 636 PM EDT SUN MAY 27 2007 MDZ013-016-272300- PRINCE GEORGES MD-CHARLES MD- 636 PM EDT SUN MAY 27 2007 ...STRONG THUNDERSTORMS TO AFFECT PRINCE GEORGES AND CHARLES COUNTIES... AT 636 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 4 MILES NORTHWEST OF INDIAN HEAD TO 6 MILES WEST OF RISON...MOVING EAST AT 20 MPH. THESE STORMS WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 50 MPH. THE COMMUNITIES OF INDIAN HEAD...FRIENDLY...WALDORF...ST. CHARLES AND LA PLATA WILL BE AFFECTED BY THESE STORMS. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE WARNINGS ARE ISSUED. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT. MANNING
The Sterling radar (KLWX), 41 km away, was scanning. The volume nearest the first event began at 22:42 UTC.
6 thunderstorm wind. Local standard time, as filed.
Emergency Management reported a tree down near Georgia Avenue and Highway 108 in Olney, MD.
Emergency Management reported power lines down on Larchmont Avenue in Capitol Heights. The National Park Service reported between 200 and 300 trees down in Bowie. Some trees fell on power lines.
Emergency management reported a tree down near Route 97 and Stone Road north of Westminster, MD.
Emergency Management reported a tree down near the intersection of Falls Road and Mt. Carmel Road north of Butler, MD.
Emergency Management reported two trees down on power lines in Linthicum, MD.
Power lines were downed in Jarrettsville, 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, May 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: 27267, 27272, 27268, 27269, 27270, 27271.