1 thunderstorm wind, as filed by the National Weather Service.
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 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 Sep 17, 3:00 AM EST, 0 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 400 AM EDT FRI SEP 17 2004 .SHORT TERM... MAIN FORECAST PROBLEM FOR THE NEXT COUPLE OF DAYS WILL BE THE REMNANTS OF IVAN. LIGHT RAIN CURRENTLY MOVING IN FROM THE SOUTHWEST THIS MORNING. AREA RADARS SHOW HEAVIER RAINFALL STILL SOUTH...AS THE REMNANTS OF IVAN MOVE UP THE WEST SIDE OF THE MOUNTAINS. EXPECT RAINFALL AMOUNTS TO INCREASE DURING THE DAY AND TONIGHT AS THE CENTER OF THE DEPRESSION MOVES INTO NORTH CAROLINA. PREVIOUS FORECAST HAD A GOOD HANDLE ON PENDING SITUATION. ONLY MADE A FEW MINOR CHANGES. THE FIRST CHANGE WAS TO THE TEMPERATURE FIELDS FOR TODAY AND TONIGHT. WITH THE BLANKET OF CLOUDS AND A TROPICAL AIRMASS IN PLACE...NOT MUCH OF A VARIATION IN HIGHS AND LOWS. RAISED OVERNIGHT LOWS A FEW DEGREES ACROSS THE BOARD. NEXT CHANGE I MADE WAS TO THE WEATHER SECTION. ADDED ISOLATED THUNDER TO ALL ZONES FOR TODAY. WITH FRONTAL BOUNDARY EXPECTED TO STALL ALONG THE MASON DIXON LINE AND THE REMNANTS OF IVAN STILL HOLDING ON TO SOME BANDING FEATURES...COULD NOT RULE OUT A THUNDERSTORM TODAY. WITH REGARD TO THE FLOOD WATCH AND QPF AMOUNTS...WILL KEEP WATCH POSTED WITH RAINFALL OF 4 TO 7 INCHES POSSIBLE. THE HEAVIEST RAINFALL WILL BE TONIGHT. && .AVIATION...MAINLY MVFR CONDITIONS TODAY AS CLOUDS AND RAIN ASSOCIATED WITH IVAN MOVES NORTH. ISOLATED THUNDERSTORMS POSSIBLE TODAY. BY TONIGHT IFR CONDITIONS EXPECTED AS HEAVIER RAINFALL MOVES IN. WINDS GENERALLY SE AND S AROUND 10 KTS. && .MARINE...NO FLAGS THROUGH TONIGHT...WINDS APPROACHING SMALL CRAFT ADVISORY SATURDAY NIGHT. && .LONG TERM... SATURDAY THROUGH THURSDAY... AT 12Z SATURDAY 00Z RUNS OF THE ETA AND GFS PLACE THE CENTER OF THE TROPICAL DEPRESSION ASSOCIATED WITH THE REMAINS OF IVAN NEAR THE BORDER BETWEEN CENTRAL VA AND CENTRAL NC. ETA MOVES THE CENTER OF THE CIRCULATION SOUTHWARD INTO NORTHERN SC BY 00Z SUNDAY...WHILE THE GFS INDICATED THAT THE CENTER WILL BE ACROSS EASTERN NC AT THAT TIME. PREFER THE SLOWER PROGRESSION OF THE SYSTEM SUGGESTED BY THE GFS GIVEN THE LONG WAVE RIDGE AMPLIFYING ACROSS THE CENTRAL AND EASTERN U.S. DURING THE DAY ON SATURDAY. IMPRESSIVE DEFORMATION ZONE TO THE NORTH ACROSS CENTRAL PA/CENTRAL NY...BUT ANOTHER DEFORMATION ZONE CLOSER TO THE CENTER OF CIRCULATION WHICH SHIFTS EASTWARD ACROSS VA ON SATURDAY. THETA-E RIDGE COINCIDES NICELY WITH DEFORMATION ZONE...AND BELIEVE LIKELY POPS FOR SHOWERS AND ISOLATED THUNDERSTORMS LOOKS PLAUSIBLE. STRONG SFC HIGH BUILDING ACROSS EASTERN CANADA MAY PUSH DRIER AIR INTO THE CWA SATURDAY NIGHT AND END SHOWER ACTIVITY...ESPECIALLY IF ONE WERE TO FOLLOW THE ETA SOLUTION...BUT WITH THE WEAK STEERING PATTERN BENEATH THE UPPER LEVEL RIDGE WILL KEEP CHC POPS IN FOR SATURDAY NIGHT FOR NOW. SUNDAY LOOKS DRY AT THIS TIME...AS REMNANTS OF IVAN SLIDE OFF THE SC COAST PER THE GFS AND INTO WESTERN SC PER TPC GUIDANCE. H85 TEMPERATURES SUNDAY WILL BE IN THE 10 TO 12 C RANGE WITH NORTHERLY FLOW...SO EXPECT HIGHS TO BE 6 TO 10 F BELOW NORMAL IN THE 60S TO NEAR 70. LONG WAVE RIDGE CENTERED OVER THE CENTRAL U.S. IS PROGGED TO REMAIN NEARLY STATIONARY OR SHOW VERY SLOW PROGRESSION TO THE EAST TUESDAY THROUGH THURSDAY...SO CONTINUE WITH DRY WEATHER AND A MODERATION IN HIGH TEMPERATURES. WILL HAVE TO KEEP AN EYE ON THE TRACK OF HURRICANE JEANNE...AS TPC TRACK ISSUED 11 PM EDT THURSDAY...SEPTEMBER 16...SHOWS JEANNE MAKING LANDFALL NEAR THE GA/SC BORDER AT 8 PM TUESDAY. SMITH .LWX WATCHES/WARNINGS/ADVISORIES... DC...FLOOD WATCH UNTIL 800 PM EDT SATURDAY FOR ZONE DCZ001. MD...FLOOD WATCH UNTIL 800 PM EDT SATURDAY FOR ZONES MDZ002>007... MDZ009>011...MDZ013>014...MDZ016>018. VA...FLOOD WATCH UNTIL 800 PM EDT SATURDAY FOR ZONES VAZ021... VAZ025>031...VAZ036>042...VAZ050>057. WV...FLOOD WATCH UNTIL 800 PM EDT SATURDAY FOR ZONES WVZ048>055. MARINE...NONE. && SHORT TERM/AVIATION...CPW LONG TERM...SMITH
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1215 AM EDT FRI SEP 17 2004 DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-180800- 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- 1129 AM EDT FRI SEP 17 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MARYLAND WEST OF THE CHESAPEAKE BAY AND EAST OF GARRETT COUNTY...EASTERN WEST VIRGINIA...NORTHERN AND CENTRAL VIRGINIA AND WASHINGTON DC. .DAY ONE... A FLOOD WATCH IS IN EFFECT FOR NORTHERN VIRGINIA...MARYLAND...THE PANHANDLE OF WEST VIRGINIA...AND THE DISTRICT OF COLUMBIA. RAINFALL ASSOCIATED WITH THE REMNANTS OF IVAN WILL MOVE INTO THE AREA THROUGH SATURDAY. TOTAL RAINFALL AMOUNTS OF 3 TO 5 INCHES WILL BE POSSIBLE. THIS COULD LEAD TO THE FLOODING OF LOW LYING AREAS...SMALL STREAMS AND CREEKS. BECAUSE THERE IS SO MUCH SPIN IN THE ATMOSPHERE TO THE EAST OF THE REMNANTS OF IVAN CENTRAL AND NORTHERN VIRGINIA...PORTIONS OF CENTRAL MARYLAND..AND THE DISTRICT OF COLUMBIA HAVE A RISK FOR TORNADOES THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN... THE FLOOD WATCH WILL REMAIN IN EFFECT THROUGH SATURDAY. AS THE RAIN CONTINUES...SIGNIFICANT RISES ON THE POTOMAC RIVER WILL BE POSSIBLE...WITH SEVERAL LOCATIONS EXCEEDING FLOOD STAGE ON SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED.
The Sterling radar (KLWX), 126 km away, was scanning. The volume nearest the first event began at 07:59 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds downed trees and power lines in Harford County. The thunderstorm also produced a tornado in this area early on the morning on the 18th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2004Every state in 2004This day in weather historyWarnings in Maryland, September 2004
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: 5426006.