5 inches of rain on Howard County during the morning of the 11th. Woodbine Road on the Carroll County line was closed by flooding.
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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.
Heavy downpours dropped over 1.5 inches of rain on Howard County during the morning of the 11th. Woodbine Road on the Carroll County line was closed by flooding.
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 Aug 10, 9:00 AM EST, 1 hour 50 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1000 AM EDT SUN AUG 10 2003 NO MAJOR CHANGES PLANNED WITH MORNING UPDATE. WILL BASICALLY REFRESH WORDING IN A COUPLE OF GROUPS. CURRENTLY CARRYING SCATTERED TO LIKELY POPS AND THIS LOOKS GOOD. AIRMASS STILL QUITE MOIST WITH PWATS AROUND 1.8 AGAIN THIS AM. AREAS OUT WEST RECEIVED SIGNIFICANT RAINS OVER THE PAST 24 HOURS BASED ON REPORTS AND RADAR ESTIMATES. RADAR IS FAIRLY QUIET ACROSS THE CWA AT THIS TIME...BUT ONCE STORMS DEVELOP THEY WILL BE SLOW MOVERS AND CAPABLE OF DROPPING SOME VERY HEAVY RAINFALL. WILL LEAVE WATCH IN PLACE. .LWX... DC...NONE. MD...FLOOD WATCH THRU THIS EVE MDZ002>003. VA...FLOOD WATCH THRU THIS EVE VAZ021...VAZ025>031...VAZ036>037. WV...FLOOD WATCH THRU THIS EVE WVZ048>055. MARINE...NONE.
DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-110900- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1045 AM EDT SUN AUG 10 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MARYLAND WEST OF THE CHESAPEAKE BAY AND EAST OF GARRETT COUNTY...THE DISTRICT OF COLUMBIA...NORTHERN VIRGINIA...THE NORTHERN AND CENTRAL SHENANDOAH VALLEY...AND THE EASTERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...THIS AFTERNOON A FLOOD WATCH IS IN EFFECT THIS AFTERNOON AND EVENING FOR THE SHENANDOAH VALLEY AND FOOTHILLS. SIGNIFICANT RAINFALLS OVER THE PAST TWO DAYS HAVE LEFT SOIL CONDITIONS NEARLY SATURATED OVER THE SHENANDOAH VALLEY AND ADJACENT FOOTHILLS. MORE SHOWERS AND THUNDERSTORMS ARE EXPECTED. THE THUNDERSTORMS THIS AFTERNOON AND THIS EVENING WILL BE CAPABLE OF PRODUCING VERY HEAVY RAINFALL AND POSSIBLE FLOODING. SOME OF THE STRONGER THUNDERSTORMS COULD PRODUCE 2 TO 3 INCHES OF RAINFALL IN A SHORT PERIOD OF TIME WHICH WOULD BE SUFFICIENT TO CAUSE FLASH FLOODING. .DAYS TWO THROUGH SEVEN... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED...BUT SPOTTERS ARE ENCOURAGED TO FORWARD HEAVY RAINFALL OR FLOODING REPORTS TO THE NATIONAL WEATHER SERVICE IN STERLING. CPW/MANNING
DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-101315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 713 AM EDT SUN AUG 10 2003 ...PATCHY FOG TO AFFECT THE AREA THROUGH MID MORNING... AMPLE LOW LEVEL MOISTURE AND LIGHT WINDS HAVE COMBINED THIS MORNING TO PRODUCE SOME FOG ACROSS THE REGION. ALTHOUGH THE FOG IS NOT WIDESPREAD...VISIBILITY IN SOME AREAS WILL QUICKLY FALL TO LESS THAN 1 STATUE MILE. THE FOG SHOULD START TO LIFT OUT BY 9:30 AM. MOTORISTS ARE URGED TO SLOW DOWN AND STAY A SAFE DRIVING DISTANCE BEHIND THE CAR IN FRONT OF YOU. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER DETAILS OR UPDATES. CPW
DCZ001-MDZ004>007-009>011-013-014-016>018-VAZ038>042-050>057-102200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1130 AM EDT SUN AUG 10 2003 ...THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINFALL THIS AFTERNOON AND EVENING... ABUNDANT MOISTURE IS AVAILABLE IN THE ATMOSPHERE OVER THE MID ATLANTIC REGION THIS AFTERNOON. AN UPPER LEVEL DISTURBANCE TO THE WEST IS EXPECTED TO CAUSE SHOWERS AND THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS THE AREA. THE STRONGER SHOWERS AND THUNDERSTORMS WILL PRODUCE VERY HEAVY RAINFALL. EAST OF THE BLUE RIDGE...WIDESPREAD FLOODING IS NOT ANTICIPATED AT THIS TIME...BUT ISOLATED POOR DRAINAGE FLOODING IS POSSIBLE WITH THE STRONGEST ACTIVITY. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER DETAILS OR UPDATES. CPW/MANNING
The Sterling radar (KLWX), 57 km away, was scanning. The volume nearest the first event began at 15:50 UTC.
1 flash flood. Local standard time, as filed.
Woodbine Road on the Carroll County line was closed by flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2003Every state in 2003This day in weather historyWarnings in Maryland, August 2003
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: 5371429.