Alert archive / Virginia / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 41, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at May 29, 2009, 3:34 PM EDT for Greene County, Madison County, Orange County, Virginia. It was in force for 41 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
- May 29, 2009, 3:34 PM EDT (19:34 UTC)
- Expired
- May 29, 2009, 4:15 PM EDT
- In force
- 41 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Greene County, VA, Madison County, VA, Orange County, VA
The radar
The Sterling radar (KLWX), 99 km from the middle of the area, began a volume at 19:36 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 |
|---|---|---|---|
| May 29, 1:26 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Roanoke, VA (KRNK), launched 12:00Z, 7.6 hours before the alert went out and 166 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
- 131 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 860 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
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 May 29, 3:24 PM EDT, 10 minutes earlier.
Area forecast discussion, May 29, 3:24 PM EDT, 10 minutes before
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</html>Hazardous weather outlook, May 29, 1:39 PM EDT, 1 hour 55 minutes before
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Special weather statement, May 29, 12:34 PM EDT, 3 hours before
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</html>Special weather statement, May 29, 1:34 PM EDT, 2 hours before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 134 PM EDT FRI MAY 29 2009 MDZ009-291800- MONTGOMERY MD- 134 PM EDT FRI MAY 29 2009 ...STRONG THUNDERSTORM TO AFFECT MONTGOMERY COUNTY... AT 135 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER BEALLSVILLE...MOVING EAST AT 20 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE BOYDS... GERMANTOWN...GAITHERSBURG...NORTH POTOMAC AND MONTGOMERY VILLAGE. WIND GUSTS OF 40 TO 50 MPH CAN BE EXPECTED WITH THIS STORM. KRAMAR
Special weather statement, May 29, 1:58 PM EDT, 1 hour 36 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 158 PM EDT FRI MAY 29 2009 MDZ009-010-013-291830- HOWARD MD-MONTGOMERY MD-PRINCE GEORGES MD- 158 PM EDT FRI MAY 29 2009 ...STRONG THUNDERSTORMS TO AFFECT HOWARD...MONTGOMERY AND PRINCE GEORGES COUNTIES... AT 158 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER GAITHERSBURG...MOVING EAST AT 25 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE ROCKVILLE...OLNEY...ASPEN HILL...COLESVILLE...WHITE OAK...FAIRLAND... BELTSVILLE AND COLUMBIA. WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. KRAMAR
Special weather statement, May 29, 2:11 PM EDT, 1 hour 23 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 211 PM EDT FRI MAY 29 2009 VAZ041-052-291900- FAUQUIER VA-PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA- 211 PM EDT FRI MAY 29 2009 ...STRONG THUNDERSTORMS TO AFFECT FAUQUIER AND PRINCE WILLIAM/MANASSAS/MANASSAS PARK COUNTIES... AT 212 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER MEADOWVILLE...MOVING EAST AT 15 MPH. LOCATIONS THAT WILL LIKELY BE AFFECTED BY THIS STORM INCLUDE THE PLAINS AND HAYMARKET. WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. KRAMAR
Special weather statement, May 29, 3:19 PM EDT, 15 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 |
|---|---|---|---|---|
| May 29, 12:14 AM EDT | Flash Flood Watch | LWX | Arlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more | 4 hr |
| May 29, 4:22 AM EDT | Flash Flood Watch | LWX | Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church | 15 hr |
| May 29, 1:06 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 24 min |
| May 29, 2:21 PM EDT | Special Marine Warning | LWX | 114 min | |
| May 29, 2:40 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Fauquier, Prince William, City of Manassas, City of Manassas Park | 24 min |
| May 29, 3:54 PM EDT | Special Marine Warning | LWX | 96 min | |
| May 29, 4:08 PM EDT | Special Marine Warning | LWX | 67 min | |
| May 29, 4:33 PM EDT | Special Marine Warning | LWX | 44 min | |
| May 29, 4:44 PM EDT | Special Marine Warning | LWX | 77 min | |
| May 29, 5:48 PM EDT | Special Marine Warning | LWX | 87 min | |
| May 29, 5:56 PM EDT | Special Marine Warning | LWX | 2 hr | |
| May 29, 12:40 AM EDT | Flash Flood Warning | LWX | Montgomery | 69 min |
| May 29, 2:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, Montgomery, Prince George's, City of Baltimore | 51 min |
| May 29, 3:15 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 27 min |
| May 29, 5:39 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 40 min |
| May 29, 5:52 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 31 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 2009Every severe thunderstorm warning in 2009
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.