Thunderstorms with high wind, large hail, and dangerous lightning moved across Maryland between 4 PM EDT on the 10th through 2 AM EDT on the 11th. In Allegany County, dime sized hail fell in Frostburg where winds gusted to 40 MPH.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
Thunderstorms with high wind, large hail, and dangerous lightning moved across Maryland between 4 PM EDT on the 10th through 2 AM EDT on the 11th. In Allegany County, dime sized hail fell in Frostburg where winds gusted to 40 MPH. In Frederick County, a 69 MPH wind gust was recorded in Emmitsburg where 2 inches of rain fell. Southeast of Emmitsburg, a 100x300 foot barn under construction on Dry Bridge Road collapsed. Three workers inside the structure were injured. Trees were downed near Rocky Ridge south of Thurmont. A spotter just across the Washington County border near Smithsburg reported a 45 MPH wind gust and viewed a possible tornado in Frederick County 10 miles northeast of their location. In Carroll County, several trees were felled. A portion of a tin roof was torn off in Detour. Three trees were downed in a campground near Double Pipe Creek. A wind gust of 42 MPH was recorded in Westminster. In Baltimore County, a wind gust of 48 MPH was recorded at the University of Maryland campus in Baltimore. Four trees were downed across the western part of Baltimore. Large trees were downed in Reisterstown and Randallstown and tree limbs were downed in Owings Mills. A total of 13,000 customers across the county lost power because of the storms. In Harford County, lightning struck a home in Jarrettsville. The bolt blew off the chimney and started the attic on fire resulting in $30,000 damage. In Montgomery County, golfball sized hail was reported in Germantown. Damage was reported to a car and to shingles and siding on a townhouse. In Prince George's County, several trees were downed onto roads and cars in the Fox Run Estates neighborhood of Clinton. In Calvert County, several trees were downed in the Olivet area.
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 10, 2:10 PM EST, 56 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON 310 PM EDT TUE JUL 10 2001 SCOPE GETTING A LTL COLORFUL TO THE N. CDFNT SRN PA PROGGED TO INCH THRU AREA LT THIS AFTN M-D LINE...ELY EVE WASH DC-W99... NR MIDNGT SRN MD-CHO. JET DYNAMICS DRIVING SVR THREAT. WBZ 11-12K FT REDUCING HAIL THREAT. STORMS ARE MVG W/ PWAT 1-1.5 IN SO NOT A HUGE FLOOD THREAT. WL USE ENHANCED WRDG IN EVE PD...SCT POPS. THRAFTR...CAA/LWR DEWPT ADVCTN FOR TMRW. FLW HAS SLGT DWNSLP COMPONENT...SO TEMPS NOT TOO MUCH LWR...BUT MUCH DRIER/MORE COMFY. CAA CONTS INTO TMRW NGT...MARKING BGNG OF BLO NRML TEMPS THRU END OF WK. AFTN PKG WIBIS ON SKED AT 1930 UTC/330 PM EDT. G'NGT! FCSTID = 50...HTS DCA 72 87 64 85 / 30 10 0 0 BWI 68 88 58 85 / 30 10 0 0 MRB 66 85 56 84 / 30 0 0 0 IAD 66 88 56 84 / 30 10 0 0 CHO 68 89 60 85 / 30 0 0 0 HGR 64 84 54 82 / 30 0 0 0 NHK 73 89 66 83 / 30 10 0 0 W99 62 82 52 80 / 30 0 0 0 .LWX... DC...NONE. MD...NONE. VA...NONE. WV...NONE.
DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-110000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 115 PM EDT TUE JUL 10 2001 ...SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING... THE STORM PREDICTION CENTER IN NORMAN OKLAHOMA HAS INDICATED THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON ACROSS EASTERN WEST VIRGINIA...MUCH OF MARYLAND...THE DISTRICT OF COLUMBIA...AND NORTHERN VIRGINIA. THE PRIMARY THREAT FROM THESE STORMS WILL BE DAMAGING WIND GUSTS. A COLD FRONT PUSHING SOUTH TOWARDS THE AREA WILL SPARK SHOWERS AND THUNDERSTORMS THIS AFTERNOON AND TONIGHT. THE COLD FRONT WILL ENTER NORTHERN MARYLAND LATE THIS AFTERNOON...AND CLEAR CENTRAL VIRGINIA AND SOUTHERN MARYLAND TOWARDS DAWN. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR ANY POSSIBLE SEVERE WEATHER WATCHES OR WARNINGS. FOR ADDITIONAL bWEATHER INFORMATION, CHECK OUR WEB SITE AT HTTP://WWW.NWS.NOAA.GOV/ER/LWX. HTS
MDZ002>007-009>011-VAZ028-031-042-WVZ049>053-102000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 405 PM EDT TUE JUL 10 2001 ...STRONG TO SEVERE THUNDERSTORMS MOVING SOUTH OF THE PENNSYLVANIA BORDER... DOPPLER RADAR SHOWS TWO AREAS OF STRONG TO SEVERE THUNDERSTORMS MOVING FROM SOUTHERN PENNSYLVANIA INTO NORTHERN MARYLAND. THE FIRST AREA OF STORMS IS MOVING SOUTHEAST TOWARD THE WESTERN PANDHANDLE OF MARYLAND AND THE FAR EASTERN PANHANDLE OF WEST VIRGINIA. THE SECOND AREA OF STORMS IN MOVING INTO NORTHCENTRAL AND NORTHEAST MARYLAND TOWARD THE BALTIMORE METROPOLITAN AREA. BOTH AREAS OF STORMS HAVE A HISTORY OF PRODUCING DAMAGING WIND GUSTS...FREQUENT LIGHTNING AND HEAVY DOWNPOURS. WINDS UP TO 70 MPH HAVE BEEN REPORTED IN EMMITSBURG IN FREDERICK COUNTY MARYLAND. ANYONE PARTICIPATING IN OUTDOOR ACTIVITIES AS THESE STORMS APPROACH SHOULD SEEK SHELTER IMMEDIATELY. TAKE LOOSE OBJECTS INDOORS SUCH AS LAWN FURNITURE AND TRASH CANS BEFORE THE STORMS APPROACH. A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE ENTIRE AREA THROUGH 9PM. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER INFORMATION AND POSSIBLE WARNINGS THAT MAY BE ISSUED FOR THESE STORMS. MMARGRAF
The national radar mosaic for the moment the first event began.
6 thunderstorm wind, 2 hail, 1 lightning. Local standard time, as filed.
A 69 MPH wind gust was reported. Three workers were injured when a barn under construction collapsed.
Trees were downed and a roof was damaged.
Dime sized hail fell.
Lightning blew off a chimney and started an attic fire.
Trees were downed in Reisterstown and Randallstown.
Golfball sized hail damaged a car, shingles, and siding. The time of the event was estimated.
Four trees were downed.
Several trees were downed onto roads and cars in the Fox Run Estates neighborhood.
Several trees were downed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2001Every state in 2001This day in weather historyWarnings in Maryland, July 2001
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: 5259324, 5259325, 5259326, 5259327, 5259328, 5259332, 5259329, 5259330, 5259331.