Alert archive / Maryland / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 221, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 11, 2004, 4:35 PM EDT for Prince George's County, Maryland. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 11, 2004, 4:35 PM EDT (20:35 UTC)
- Expired
- Aug 11, 2004, 5:15 PM EDT
- In force
- 40 min
- Issued by
- NWS Baltimore/Washington
- Area
- Counties, with a storm outline in the text
County Prince George's County, MD
The radar
The Sterling radar (KLWX), 58 km from the middle of the area, began a volume at 20:37 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 11, 2:35 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.6 hours before the alert went out and 50 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.
- Mixed-layer CAPE
- 253 J/kg
- Mixed-layer CIN
- -107 J/kg
- Mixed-layer LCL
- 1194 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Aug 11, 4:26 PM EDT, 9 minutes earlier.
Area forecast discussion, Aug 11, 4:26 PM EDT, 9 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 441 AM EDT WED AUG 11 2004 DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048>055-121000- 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- 441 AM EDT WED AUG 11 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 COLD FRONT APPROACHING THE APPALACHIAN MOUNTAINS FROM THE OHIO VALLEY WILL TRIGGER SCATTERED SHOWERS AND THUNDERSTORMS EARLY THIS AFTERNOON ACROSS THE MOUNTAINS...WHICH WILL TRAVEL EAST AND AFFECT LOCATIONS FROM THE BLUE RIDGE EAST TO THE CHESAPEAKE BAY DURING THE LATE AFTERNOON AND EVENING HOURS. SOME OF THESE THUNDERSTORMS MAY BECOME SEVERE WITH HEAVY DOWNPOURS...GUSTY TO DAMAGING WINDS...AND LARGE HAIL. .DAYS TWO THROUGH SEVEN... THE RISK FOR SEVERE THUNDERSTORMS WILL CONTINUE THURSDAY...ESPECIALLY EAST OF THE BLUE RIDGE AS THE COLD FRONT STALLS ACROSS THE REGION. TROPICAL SYSTEMS BONNIE AND CHARLEY ARE FORECAST TO AFFECT THE REGION FRIDAY AND AGAIN LATE DURING THE WEEKEND. THERE IS STILL QUITE A BIT OF UNCERTAINTY WITH THE TRACK AND TIMING OF THESE SYSTEMS. HEAVY RAINFALL AND POSSIBLE FLOODING WILL BECOME AN INCREASING CONCERN DURING THE WEEKEND WITH THE POSSIBLE CUMULATIVE AFFECTS OF THESE TWO SYSTEMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON. ROGOWSKI/ND
In the hours before
Local storm report, Aug 11, 4:07 PM EDT, 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
407 PM EDT WED AUG 11 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0355 PM HAIL FAIRFAX 38.85N 77.30W
08/11/2004 0.75 INCH CITY OF FAIRFAX VA OTHER FEDERAL
&&
BPLocal storm report, Aug 11, 4:15 PM EDT, 20 minutes before
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</html>Local storm report, Aug 11, 4:19 PM EDT, 16 minutes before
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</html>Local storm report, Aug 11, 4:26 PM EDT, 9 minutes before
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</html>Local storm report, Aug 11, 4:31 PM EDT, 4 minutes before
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</html>Local storm report, Aug 11, 4:35 PM EDT, 0 minutes before
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</html>The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 2:09 PM EDT | Severe Thunderstorm Warning | LWX | Clarke, Warren | 51 min |
| Aug 11, 2:24 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 51 min |
| Aug 11, 2:46 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier, Prince William | 29 min |
| Aug 11, 3:16 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, City of Fairfax | 44 min |
| Aug 11, 3:35 PM EDT | Special Marine Warning | LWX | 40 min | |
| Aug 11, 3:44 PM EDT | Severe Thunderstorm Warning | LWX | Arlington, City of Alexandria, City of Falls Church | 61 min |
| Aug 11, 3:49 PM EDT | Special Marine Warning | LWX | 71 min | |
| Aug 11, 3:58 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, City of Fairfax | 47 min |
| Aug 11, 4:14 PM EDT | Special Marine Warning | LWX | 61 min | |
| Aug 11, 4:56 PM EDT | Special Marine Warning | LWX | 94 min | |
| Aug 11, 4:56 PM EDT | Special Marine Warning | LWX | 94 min | |
| Aug 11, 6:32 PM EDT | Special Marine Warning | LWX | 88 min | |
| Aug 11, 3:42 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 48 min |
| Aug 11, 4:30 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 45 min |
| Aug 11, 5:16 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 59 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2004Every severe thunderstorm 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; radar from the NEXRAD Level II archive.