Alert archive / Maryland / Areal Flood Warnings in 2008
Areal Flood Warning 21, NWS Baltimore/Washington
NWS Baltimore/Washington issued this areal flood warning at May 11, 2008, 9:02 PM EDT for Charles County, Maryland. It was in force for 6 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
- May 11, 2008, 9:02 PM EDT (01:02 UTC)
- Expired
- May 12, 2008, 3:00 AM EDT
- In force
- 6 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Flood severity
- None
County Charles County, MD
The radar
The Sterling radar (KLWX), 69 km from the middle of the area, began a volume at 01:03 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 1.0 hours before the alert went out and 63 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
- 10 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 559 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 423 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal 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 areal flood warning went out at May 11, 3:01 PM EDT, 6 hours 1 minute earlier.
Area forecast discussion, May 11, 3:01 PM EDT, 6 hours 1 minute before
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</html>Hazardous weather outlook, May 11, 3:30 PM EDT, 5 hours 32 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 330 PM EDT SUN MAY 11 2008 ANZ530>537-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 121000- CHESAPEAKE BAY NORTH OF POOLES ISLAND MD- CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD- CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD- CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD- CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA- TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD- TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD- TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA- DISTRICT OF COLUMBIA-NORTHERN BALTIMORE-HARFORD- SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS- CALVERT-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX- ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA- KING GEORGE- 330 PM EDT SUN MAY 11 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MARYLAND PORTION OF THE CHESAPEAKE BAY...TIDAL POTOMAC RIVER...AND ADJACENT COUNTIES IN CENTRAL MARYLAND AND NORTHERN VIRGINIA AS WELL AS THE DISTRICT OF COLUMBIA. .DAY ONE...TONIGHT A GALE WARNING IS IN EFFECT FOR THE TIDAL POTOMAC RIVER AND MARYLAND CHESAPEAKE BAY THIS EVENING...AND THE BAY OVERNIGHT. A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE REST OF THE NIGHT FOR THE UPPER TIDAL POTOMAC RIVER. A FLOOD WATCH IS IN EFFECT THIS EVENING AND OVERNIGHT. RAINFALL TOTALS OF TWO TO THREE INCHES ON TOP OF ALREADY SATURATED SOILS ARE LIKELY. THE HEAVY RAIN MAY CAUSE STREAMS AND CREEKS TO OVERFLOW THEIR BANKS. ALSO...URBAN AREAS PRONE TO POOR DRAINAGE WILL BE SUSCEPTIBLE TO FLOODING. MINOR COASTAL FLOODING IS POSSIBLE NEAR TIMES OF HIGH TIDE ALONG THE WESTERN SHORE OF THE CHESAPEAKE BAY. A COASTAL FLOOD ADVISORY HAS BEEN POSTED THROUGH MUCH OF MONDAY MORNING. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE FLOOD WATCH WILL CONTINUE INTO MONDAY. RUN OFF FROM THE HEAVY RAINS WILL BEGIN TO MAKE ITS WAY INTO INTO THE RIVERS ON MONDAY...CREATING THE POTENTIAL FOR RIVER FLOODING. A GALE WARNING CONTINUES FOR THE LOWER POTOMAC RIVER AND MARYLAND CHESAPEAKE BAY THROUGH TUESDAY...WHILE SMALL CRAFT CONDITIONS ARE EXPECTED ON THE UPPER TIDAL POTOMAC RIVER. MINOR COASTAL FLOODING IS POSSIBLE NEAR TIMES OF HIGH TIDE ALONG THE WESTERN SHORE OF THE CHESAPEAKE BAY MONDAY MORNING. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY...HOWEVER RAINFALL REPORTS WOULD BE GREATLY APPRECIATED OVERNIGHT AND MONDAY. MDZ003>005-009-010-501-502-VAZ021-025>031-036>042-050-051- WVZ050>055-501>504-121000- WASHINGTON-FREDERICK MD-CARROLL-MONTGOMERY-HOWARD- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-HIGHLAND- AUGUSTA-ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE- NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-FAUQUIER-LOUDOUN- ORANGE-CULPEPER-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-PENDLETON- HARDY-WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL- 330 PM EDT SUN MAY 11 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN WEST VIRGINIA... NORTHERN AND CENTRAL VIRGINIA...AND CENTRAL AND WESTERN MARYLAND WITH THE EXCEPTION OF GARRETT COUNTY. .DAY ONE...THIS AFTERNOON AND TONIGHT A FLOOD WATCH IS IN EFFECT THIS AFTERNOON AND TONIGHT. RAINFALL TOTALS OF ONE TO THREE INCHES ON TOP OF ALREADY SATURATED SOILS ARE LIKELY. THE HEAVY RAIN MAY CAUSE STREAMS AND CREEKS TO OVERFLOW THEIR BANKS. ALSO...URBAN AREAS PRONE TO POOR DRAINAGE WILL BE SUSCEPTIBLE TO FLOODING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH FRIDAY. THE FLOOD WATCH WILL CONTINUE INTO MONDAY. RUN OFF FROM THE HEAVY RAINS WILL BEGIN TO MAKE ITS WAY INTO INTO THE RIVERS ON MONDAY...CREATING THE POTENTIAL FOR RIVER FLOODING. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY...HOWEVER RAINFALL REPORTS WOULD BE GREATLY APPRECIATED OVERNIGHT AND MONDAY. ROGOWSKI/HTS
In the hours before
Special weather statement, May 11, 3:18 PM EDT, 5 hours 44 minutes before
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</html>Local storm report, May 11, 7:25 PM EDT, 1 hour 37 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
725 PM EDT SUN MAY 11 2008
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0723 PM FLOOD ALDIE 38.98N 77.64W
05/11/2008 LOUDOUN VA TRAINED SPOTTER
FLOODING ON ROUTE 50 IN ALDIE
&&
SARLocal storm report, May 11, 9:00 PM EDT, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
900 PM EDT SUN MAY 11 2008
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0840 PM FLOOD POOLESVILLE 39.14N 77.41W
05/11/2008 MONTGOMERY MD EMERGENCY MNGR
WATER RESUCE AT WESTERLY ROAD AND EDWARDS FERRY ROAD
0855 PM FLOOD CHANTILLY 38.88N 77.41W
05/11/2008 FAIRFAX VA EMERGENCY MNGR
WATER RESCUE REPORTED IN CHANTILLY
&&
SARThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 9:00 PM EDT | Areal Flood Warning | LWX | King George, Spotsylvania, City of Fredericksburg | 6 hr |
| May 11, 11:20 PM EDT | River Flood Warning | LWX | Loudoun | 36 hr |
| May 11, 11:20 PM EDT | River Flood Warning | LWX | Culpeper, Fauquier | 34 hr |
| May 11, 11:24 PM EDT | Areal Flood Warning | LWX | Loudoun | 18 hr |
| May 11, 11:27 PM EDT | Areal Flood Warning | LWX | Fauquier, Prince William, City of Manassas | 18 hr |
| May 11, 11:31 PM EDT | Areal Flood Warning | LWX | Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church | 18 hr |
| May 11, 11:34 PM EDT | Areal Flood Warning | LWX | Stafford | 12 hr |
| May 12, 12:02 AM EDT | Coastal Flood Warning | LWX | Arlington, Fairfax, Stafford, City of Alexandria, City of Fairfax, City of Falls Church | 6 hr |
| May 12, 12:14 AM EDT | Areal Flood Warning | LWX | Clarke | 12 hr |
| May 12, 12:22 AM EDT | Areal Flood Warning | LWX | Culpeper, Rappahannock | 12 hr |
| May 12, 2:58 AM EDT | Areal Flood Warning | LWX | Spotsylvania | 4 hr |
| May 12, 11:47 AM EDT | Areal Flood Warning | LWX | Stafford | 6 hr |
| May 12, 3:30 PM EDT | River Flood Warning | LWX | Loudoun | 37 hr |
| May 12, 3:30 PM EDT | River Flood Warning | LWX | Fairfax | 37 hr |
| May 11, 8:12 PM EDT | Areal Flood Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 6 hr |
| May 11, 8:50 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick | 6 hr |
| May 11, 9:04 PM EDT | Areal Flood Warning | LWX | Baltimore, Harford, City of Baltimore | 8 hr |
| May 11, 9:21 PM EDT | Wind Advisory | LWX | Anne Arundel, Baltimore, Calvert, Saint Mary's, City of Baltimore | 7 hr |
| May 11, 10:13 PM EDT | Areal Flood Warning | LWX | Calvert, Saint Mary's | 16 hr |
| May 11, 11:20 PM EDT | River Flood Warning | LWX | Frederick | 43 hr |
| May 11, 11:20 PM EDT | River Flood Warning | LWX | Montgomery | 16 hr |
| May 11, 11:20 PM EDT | River Flood Warning | LWX | Washington | 43 hr |
| May 12, 12:54 AM EDT | Areal Flood Warning | LWX | Washington | 5 hr |
| May 12, 2:18 AM EDT | Areal Flood Warning | LWX | Anne Arundel, Montgomery, Prince George's | 16 hr |
| May 12, 2:41 AM EDT | Areal Flood Warning | LWX | Frederick | 18 hr |
| May 12, 4:44 AM EDT | Areal Flood Warning | LWX | Carroll, Howard | 12 hr |
| May 12, 4:59 AM EDT | Areal Flood Warning | LWX | Charles | 12 hr |
| May 12, 2:34 PM EDT | Areal Flood Warning | LWX | Calvert, Saint Mary's | 6 hr |
| May 11, 11:20 PM EDT | River Flood Warning | LWX | Berkeley | 46 hr |
| May 11, 11:45 PM EDT | Areal Flood Warning | LWX | Jefferson | 12 hr |
| May 12, 1:12 AM EDT | Areal Flood Warning | LWX | Berkeley | 10 hr |
| May 12, 11:52 AM EDT | Areal Flood Warning | LWX | Jefferson | 6 hr |
Nearby
Areal Flood Warnings in Maryland, 2008Every areal flood warning in 2008
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.