Thunderstorm Wind, Allegany
- When
- May 21, 6:35 AM EST
- Where
- Allegany County, Frostburg
- Measured
- 55 kt (63 mph) estimated gust
- Reported by
- FIRE DEPT/RESCUE SQUAD
- Coordinates
- 39.650, -78.933
Downed trees.
Damaging Wind in Maryland, May 21, 2004
1 thunderstorm wind, as filed by the National Weather Service.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 1
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.
What forecasters said that day
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 21, 2:00 AM EST, 4 hours 35 minutes earlier.
Area forecast discussion, May 21, 2:00 AM EST, 4 hours 35 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 300 AM EDT FRI MAY 21 2004 .SHORT TERM...TODAY AND TONIGHT MAIN FORECAST CHALLENGE TODAY CENTERS AROUND CONVECTION...WHEN AND WHERE IT WILL INITIATE. SEVERAL THINGS WILL FACTOR INTO THE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS TODAY...ONE BEING A LARGE MCS CURRENTLY OVER THE GREAT LAKES REGION...THE SECOND WILL BE A FRONTAL BOUNDARY SLOWLY SLIDING SOUTHWARD OVER PA...AND THE THIRD BEING ANY MESOCALE FEATURES SUCH AS OUTFLOW BOUNDARIES. SOME DIFFERENCES BETWEEN THE MODELS TODAY. MAIN DIFFERENCE IS THE SOUTHWARD PROGRESSION OF THE FRONTAL BOUNDARY TO THE NORTH. THE ETA DOES NOT BRING THE FRONT AS FAR SOUTH AS THE AVN. IN ADDITION...YESTERDAYS AVN RUN DID NOT BRING THE BOUNDARY AS FAR SOUTH AS THIS MORNINGS RUN. THE UKMET DOES DIP THE BOUNDARY SOUTHWARD OVER THE CWFA DURING THE DAY TODAY. WILL LEAN TOWARD THE UKMET AND AVN SOLUTIONS. THE SHORTWAVE ASSOCIATED WITH THE MCS OVER THE GREAT LAKES REGION WILL MOVE SOUTHEAST ALONG THE WAVY FRONTAL BOUNDARY...AND SHOULD APPROACH THE CWFA DURING MAX DAYTIME HEATING. HOWEVER...ONE CAVEAT COULD BE THAT IF THE NORTHERN CWFA RECEIVES MUCH BLOW OFF...OR THE LOW CLOUDS AND FOG LINGER THROUGH LATE MORNING/EARLY AFTERNOON...CONVECTION WILL BE SLOW TO INITIATE. AT THIS TIME...WILL HAVE THE HIGHEST POPS IN THE VICINITY OF THE APPROACHING BOUNDARY/MCS (HIGH IN CHANCE/SCATTERED). TEMPERATURES COULD ALSO BE SOMEWHAT TRICKY TODAY...ESPECIALLY IF THE LOW CLOUDS AND FOG HANG IN...THEY WILL INHIBIT HEATING. DID NOT MAKE MANY CHANGES TO THE CURRENT FORECAST...EXCEPT TO LOWER MAX TEMPS IN THE NORTH A FEW DEGREES. THUNDERSTORMS SHOULD BE MOSTLY DIURNAL IN NATURE AND SHOULD BEGIN TO DIMINISH WITH THE LOSS OF HEATING. WILL TAPER OFF THE POPS INTO THE LATE EVENING HOURS. LISTEMAA .MID TERM (SAT-SUN NGT)... ONLY REAL CHG WAS TO MAKE SUMMER-LIKE TEMPS EVEN MORE SUMMERY... BNDRY STAYS N OF THE AREA...KEEPING MID ATLC IN WARM SECTOR. RAISED TEMPS TO 90 FOR SUN. ALSO MAINTAINED DIURNALLY DRIVEN CNVTCN EACH AFTN. HELICITY IS NIL...BUT CAPES SHOULD EXCEED 1500 IN THE AFTN. EXPECTING THE USUAL SUSPECTS...TSTMS TO DVLP OVR THE MTNS DRIVEN E BY EVE ON WRLY FLOW. 13 && XTNDD...NO SIG CHGS MADE. OVRALL PTTN FAIRLY STAGNANT...W/ STALLED FRNTL BNDRY IN THE NEIGHBORHOOD. SOME HINTS AT A PTTN CHG TWD DAYS 7-8. WL TAKE A WAIT-N-SEE ATTITUDE. WL TAPER POPS OFF TWD CLIMO BY DAY 7. TEMPS LWR THAN THE WKND...WHICH SEEMS RSNBL DUE TO POTL FOR XTNSV CLDCVR. SOLN WL ULTIMATELY DEPEND UPON THE EXACT POSITIONING OF FRNT-- AND WHETHER CWFA ENDS UP ON WARM OR COLD SIDE. DONT FEEL SKILL PRSNT TO DISCERN THIS ATTM. .LWX... DC...NONE. MD...NONE. VA...NONE. WV...NONE.
Hazardous weather outlook, May 21, 3:48 AM EST, 2 hours 47 minutes before
DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-010000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 448 AM EDT FRI MAY 21 2004 DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-211629- ALBEMARLE VA-ALLEGANY MD-ANNE ARUNDEL MD- ARLINGTON/FALLS CHURCH/ALEXANDRIA VA-AUGUSTA VA-BERKELEY WV- CALVERT MD-CARROLL MD-CHARLES MD-CLARKE VA-CULPEPER VA- DISTRICT OF COLUMBIA DC-FAIRFAX VA-FAUQUIER VA-FREDERICK VA- FREDERICK MD-GRANT WV-GREENE VA-HAMPSHIRE WV-HARDY WV-HARFORD MD- HIGHLAND VA-HOWARD MD-JEFFERSON WV-KING GEORGE VA-LOUDOUN VA- MADISON VA-MINERAL WV-MONTGOMERY MD-MORGAN WV-NELSON VA- NORTHERN BALTIMORE MD-ORANGE VA-PAGE VA-PENDLETON WV- PRINCE GEORGES MD-PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- RAPPAHANNOCK VA-ROCKINGHAM VA-SHENANDOAH VA-SOUTHERN BALTIMORE MD- SPOTSYLVANIA VA-ST. MARYS MD-STAFFORD VA-WARREN VA-WASHINGTON MD- 448 AM EDT FRI MAY 21 2004 .DAY ONE... SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY AND TONIGHT OVER THE EXTREME EASTERN HANDLE OF WEST VIRGINIA...WESTERN MARYLAND AND NORTHERN VIRGINIA. SOME STORMS MAY BE SEVERE...PRODUCING WIND GUSTS TO 60 TO 70 MPH AND NICKEL TO QUARTER SIZE HAIL. A FRONTAL BOUNDARY WILL APPROACH THE NORTHERN MARYLAND STATE LINE TODAY. A STRONG UPPER LEVEL DISTURBANCE...PRODUCING A LARGE AREA OF THUNDERSTORMS...IS MOVING SOUTHEAST ALONG THE FRONT. THIS LARGE AREA OF STORMS IS EXPECTED TO MOVE SOUTHEAST OVER PORTIONS OF EXTREME EASTERN WEST VIRGINIA...WESTERN MARYLAND AND NORTHERN VIRGINIA THIS MORNING AND AFTERNOON. .DAYS TWO THROUGH SEVEN... HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED.
In the hours before
Special weather statement, May 21, 3:54 AM EST, 2 hours 41 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 454 AM EDT FRI MAY 21 2004 DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-211630- ALBEMARLE VA-ALLEGANY MD-ANNE ARUNDEL MD- ARLINGTON/FALLS CHURCH/ALEXANDRIA VA-AUGUSTA VA-BERKELEY WV- CALVERT MD-CARROLL MD-CHARLES MD-CLARKE VA-CULPEPER VA- DISTRICT OF COLUMBIA DC-FAIRFAX VA-FAUQUIER VA-FREDERICK VA- FREDERICK MD-GRANT WV-GREENE VA-HAMPSHIRE WV-HARDY WV-HARFORD MD- HIGHLAND VA-HOWARD MD-JEFFERSON WV-KING GEORGE VA-LOUDOUN VA- MADISON VA-MINERAL WV-MONTGOMERY MD-MORGAN WV-NELSON VA- NORTHERN BALTIMORE MD-ORANGE VA-PAGE VA-PENDLETON WV- PRINCE GEORGES MD-PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- RAPPAHANNOCK VA-ROCKINGHAM VA-SHENANDOAH VA-SOUTHERN BALTIMORE MD- SPOTSYLVANIA VA-ST. MARYS MD-STAFFORD VA-WARREN VA-WASHINGTON MD- 454 AM EDT FRI MAY 21 2004 SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY AND TONIGHT OVER THE EXTREME EASTERN HANDLE OF WEST VIRGINIA...WESTERN MARYLAND AND NORTHERN VIRGINIA. SOME STORMS MAY BE SEVERE...PRODUCING WIND GUSTS TO 60 TO 70 MPH AND NICKEL TO QUARTER SIZE HAIL. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER DETAILS OR UPDATES.
Special weather statement, May 21, 5:47 AM EST, 48 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 647 AM EDT FRI MAY 21 2004 DCZ001-MDZ002>007-009>011-VAZ021-025>031-036>042-050>056-WVZ048>055- 211236- ALBEMARLE VA-ALLEGANY MD-ARLINGTON/FALLS CHURCH/ALEXANDRIA VA- AUGUSTA VA-BERKELEY WV-CARROLL MD-CLARKE VA-CULPEPER VA- DISTRICT OF COLUMBIA DC-FAIRFAX VA-FAUQUIER VA-FREDERICK VA- FREDERICK MD-GRANT WV-GREENE VA-HAMPSHIRE WV-HARDY WV-HARFORD MD- HIGHLAND VA-HOWARD MD-JEFFERSON WV-LOUDOUN VA-MADISON VA-MINERAL WV- MONTGOMERY MD-MORGAN WV-NELSON VA-NORTHERN BALTIMORE MD-ORANGE VA- PAGE VA-PENDLETON WV-PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- RAPPAHANNOCK VA-ROCKINGHAM VA-SHENANDOAH VA-SOUTHERN BALTIMORE MD- SPOTSYLVANIA VA-STAFFORD VA-WARREN VA-WASHINGTON MD- 647 AM EDT FRI MAY 21 2004 ...PATCHY DENSE FOG WILL REDUCE VISIBILITIES TO LESS THAN ONE HALF OF A MILE THROUGH 830AM... PATCHY DENSE FOG HAS DEVELOPED THIS MORNING OVER THE EXTREME EASTERN PANHANDLE OF WEST VIRGINIA...WESTERN MARYLAND...AND MUCH OF NORTHERN VIRIGINIA. VISIBILITIES WILL BE REDUCED TO ONE HALF OF A MILE OR LESS IN SOME AREAS DURING THE MORNING COMMUTE. MOTORISTS SHOULD REDUCE SPEED AND USE LOW BEAMS. A LINE OF STRONG TO SEVERE THUNDERSTORMS OVER CENTRAL PENNSYLVANIA WILL BEGIN APPROACHING THE EXTREME EASTERN PANHANDLE OF WEST VIRIGINA AND WESTERN MARYLAND BY 830 AM. STORMS WITHIN THIS LINE HAVE A HISTORY OF PRODUCING DAMAGING WIND GUSTS.
The radar
The Sterling radar (KLWX), 145 km away, was scanning. The volume nearest the first event began at 11:37 UTC.
Event by event
1 thunderstorm wind. Local standard time, as filed.
What these are
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Damaging Winds in Michigan, May 21, 2004
- Tornadoes and Flash Flooding in Iowa, May 21 to 22, 2004
- Tornado in Iowa, May 21, 2004
- Flooding in Michigan, May 21 to 23, 2004
- Flash Flooding and Hail in Ohio, May 21, 2004
- Flash Flooding and Hail in Ohio, May 21 to 22, 2004
- Tornado and Hail in Ohio, May 21, 2004
- Flash Flooding in Ohio, May 21, 2004
- Flash Flooding and Flooding in Ohio, May 21, 2004
- Flash Flood in Pennsylvania, May 21, 2004
- Flooding in Ohio, May 21 to 24, 2004
- Flood and Damaging Winds in Wisconsin, May 21, 2004
More
Every storm in Maryland in 2004Every state in 2004This day in weather historyWarnings in Maryland, May 2004
Sources
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: 5397681.