Alert archive / Maryland / Flash Flood Warnings in 2004

Flash Flood Warning 25, NWS Baltimore/Washington

June 17, 2004Saint Mary's County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jun 17, 2004, 10:19 PM EDT for Saint Mary's County, Maryland. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 17, 2004, 10:19 PM EDT (02:19 UTC)
Expired: Jun 18, 2004, 2:15 AM EDT
In force: 4 hr
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

County Saint Mary's County, MD

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 2.3 hours before the alert went out and 104 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3142 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Jun 17, 9:30 PM EDT, 49 minutes earlier.

Area forecast discussion, Jun 17, 9:30 PM EDT, 49 minutes before

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Hazardous weather outlook, Jun 17, 11:29 AM EDT, 10 hours 50 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1129 AM EDT THU JUN 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 THU JUN 17 2004

.DAY ONE...
SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY THE EXTREME
EASTERN PANHANDLE OF WEST VIRGINIA...WESTERN AND CENTRAL MARYLAND
AND NORTHERN VIRGINIA. STORMS MAY BECOME SEVERE PRODUCING WIND
GUSTS IN EXCESS OF 60 MPH...PENNY SIZE HAIL AND VERY HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

In the hours before

Special weather statement, Jun 17, 7:01 PM EDT, 3 hours 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
701 PM EDT THU JUN 17 2004

MDZ018-180100-
CALVERT MD-
701 PM EDT THU JUN 17 2004

...LINE OF STRONG THUNDERSTORMS WILL CROSS CALVERT COUNTY THROUGH 9
PM...

A LINE OF THUNDERSTORMS EXTENDING FROM DUNKIRK TO CHESAPEAKE BEACH
WILL MOVE SOUTHWARD ACROSS CALVERT COUNTY THROUGH 9 PM. THESE STORMS
HAVE A HISTORY OF PRODUCING VERY HEAVY RAIN...WITH RAINFALL RATES OF
1 TO 2 INCHES PER HOUR REPORTED...AND MANY CLOUD TO GROUND LIGHTNING
STRIKES. MOTORISTS ARE ADVISED TO USE CAUTION SINCE HEAVY RAIN CAN
GREATLY REDUCE VISIBILITY AND CAUSE PONDING ON ROAD SURFACES.

SMITH

Local storm report, Jun 17, 8:53 PM EDT, 1 hour 26 minutes before

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Local storm report, Jun 17, 8:53 PM EDT, 1 hour 26 minutes before

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Local storm report, Jun 17, 9:25 PM EDT, 54 minutes before

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Local storm report, Jun 17, 9:29 PM EDT, 50 minutes before

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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 4:17 PM EDT	Special Marine Warning	LWX		88 min
Jun 18, 7:10 PM EDT	Special Marine Warning	LWX		65 min
Jun 17, 8:06 PM EDT	Flash Flood Warning	LWX	Saint Mary's	114 min
Jun 17, 8:13 PM EDT	Flash Flood Warning	LWX	Anne Arundel	2 hr
Jun 17, 10:06 PM EDT	Flash Flood Warning	LWX	Charles	4 hr
Jun 17, 10:31 PM EDT	Flash Flood Warning	LWX	Prince George's	4 hr

Nearby

Flash Flood Warnings in Maryland, 2004 Every flash flood warning in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.