1 flash flood, as filed by the National Weather Service.
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 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 30, 9:05 PM EST, 1 hour 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1005 PM EDT THU SEP 30 2004 .DISCUSSION...IR IMAGERY SHOWS UPPER LOW TO THE NORTH PROGRESSING EASTWARD INTO NEW ENGLAND THIS EVENING. AREA OF SCATTERED CLOUDS TO THE SOUTH OF THE UPPER LOW HAS MOVED OFF THE NJ COAST AT 02Z...LEAVING THE NORTHERN CWA MOSTLY CLEAR. SHORTWAVE RIDGE MOVING NORTHEASTWARD FROM THE TN VALLEY HAS TRAPPED RESIDUAL LOW-LAYER MOISTURE ACROSS SOUTHERN PORTIONS OF THE CWA AND A SC DECK FORMED EARLIER THIS EVENING. P/C SKIES IN THE SOUTHERN CWA LOOKS ON TRACK...AS DO LOW TEMPERATURES ACROSS THE ENTIRE CWA. NO UPDATES TO CURRENT ZONE PACKAGE PLANNED. && .PREVIOUS DISCUSSION...230 PM... SHORT TERM... HIPRES/DRIER AIR INFILTRATING AREA. CLDS APPR TO BE DIURNAL IN NATURE...AND WUD XPCT A GOOD DEAL OF DISSIPATION THIS EVNG. SFC RDG WL BE MVG OFFSHR TMRW...BUT UPR RDG WL BE OHD. MSTR PROFILES SUGGEST SCT CU. MOS TEMPS CLOSE AND ACCEPTED. AVIATION...CLRG SKIES AND LGT WND WUD BE CONDUSIVE FOR PATCHY FOG FORMATION. HWVR...LWRG DEWPTS BODE AGAINST IT. HV INCL MVFR VSBY TWD DAWN CHO...AND AT MTN WHERE MSTR SUPPLY MORE PLENTIFUL. WHEN WNDS DO RESUME AFTR SUNRISE...FLW WL BE SELY...TOSSING MORE MSTR BACK ACRS TAF SITES. MARINE...LGT FLOW NXT 24 HRS. HYDROLOGY...CREST NOW IN MAINSTEM PTMC...FLOWING TWD DC. FLW CONTS FOR POTM2. DWNRIVER SITES WL BE CLOSE. WATERS RECEDING UPSTREAM IN HEADWATERS. LONG TERM (FRIDAY NIGHT THROUGH THURSDAY)... HIGH PRESSURE WILL MOVE OFF THE NORTHEAST COAST BY FRIDAY NIGHT. MOISTURE WILL BE ON THE INCREASE AS SURFACE WINDS TURN TO THE SOUTHEAST AND THE LOW LEVEL SOUTHERLY JET STRENGTHENS TO 25 KT. SHORTWAVE TROUGH AND ATTENDANT COLD FRONT STILL SLATED TO MOVE ACROSS THE AREA SATURDAY NIGHT. MODELS IN GOOD AGREEMENT WITH THE TIMING OF THE FRONT. BEST UPPER DIVERGENCE/WEAK TO MODERATE INSTABILITY AND MOISTURE IN PHASE AT 18Z. MAIN COLD POOL STAYS WELL TO OUR NORTH...BUT DAYTIME HEATING AND AFOREMENTIONED CONDITIONS COULD LEAD TO THE DEVELOPMENT OF A FEW STRONG STORMS. THE FRONT MOVES OFF TO THE EAST LATE SATURDAY NIGHT...AND DRIER AND COOLER AIR STARTS TO MOVES IN. GFS ENDS PRECIP BY 12Z SUNDAY AND THE ETA KEEPS LIGHT PRECIP IN THE SOUTHEAST CORNER AT 12Z SUNDAY. AT THIS TIME WILL LEAVE AN INVISIBLE 15 POP IN THE SOUTHEAST CORNER IN CASE THE FRONT SLOWS DOWN. HIGH PRESSURE MOVES ACROSS THE REGION SUNDAY AHEAD OF THE SECONDARY COLD FRONT. EXPECT A MAINLY DRY FROPA...BUT WILL CARRY A SLIGHT CHANCE POP IN THE NORTHWEST AS MOST OF THE ENERGY GOES NORTH. WEAK MIDLEVEL RIDGE WITH SURFACE HIGH OVER THE AREA ON TUESDAY. ANOTHER CLOSED LOW IS THEN SLATED TO MOVE ACROSS THE OHIO VALLEY ON WEDNESDAY. NOT OVERLY IMPRESSED WITH MOISTURE RETURN WITH THIS SYSTEM...BUT A SLIGHT CHANCE WARRANTED IN THE NORTHERN ZONES. WILL GO WITH A DRY FORECAST THURSDAY. AS FOR TEMPS AND POPS WILL GO WITH 30 TO 40 POPS SATURDAY AND SATURDAY NIGHT AHEAD OF THE FRONT. THE COOLER AIR ON SUNDAY WILL BE SHALLOW...WITH H8 TEMPS DROPPING 3 TO 5 DEGREES. SO WILL KEEP THIS IN MIND WITH HIGHS FOR SUNDAY THROUGH TUESDAY. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && SHORT TERM/AVIATION...HTS LONG TERM...CPW UPDATED DISCUSSION...SMITH
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1120 AM EDT THU SEP 30 2004 DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-010900- 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- 1120 AM EDT THU SEP 30 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... MINOR FLOODING WILL CONTINUE ON THE MAINSTEM SHENANDOAH AND POTOMAC. THE TIDAL POTOMAC WILL ALSO BE HIGH IN GEORGETOWN AND ALEXANDRIA NEAR THE TIME OF HIGH TIDE. PLEASE REFER TO THE LATEST FLOOD STATEMENTS /WGUS81 KLWX/ FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN... A STRONG COLD FRONT WILL SWEEP THROUGH THE REGION ON SATURDAY...AND WILL BRING THE POTENTIAL FOR STRONG THUNDERSTORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED. HTS
The Sterling radar (KLWX), 141 km away, was scanning. The volume nearest the first event began at 03:14 UTC.
1 flash flood. Local standard time, as filed.
Water covering the roadway at the intersection of Route 602 and Route 626.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Virginia in 2004Every state in 2004This day in weather historyWarnings in Virginia, 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: 5425284.