Alert archive / Virginia / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 7, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Feb 11, 2009, 9:19 PM EST for 10 counties in Virginia. It was in force for 36 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
- Feb 11, 2009, 9:19 PM EST (02:19 UTC)
- Expired
- Feb 11, 2009, 9:55 PM EST
- In force
- 36 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Albemarle County, VA, City of Charlottesville, VA, Clarke County, VA, Culpeper County, VA, Fauquier County, VA, Greene County, VA, Loudoun County, VA, Madison County, VA, Orange County, VA, Rappahannock County, VA
The radar
The Sterling radar (KLWX), 76 km from the middle of the area, began a volume at 02:22 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 |
|---|---|---|---|
| Feb 11, 5:53 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Feb 11, 8:19 PM EST | Severe Thunderstorm Watch | SPC | 3 hr |
The nearest sounding before it
Roanoke, VA (KRNK), launched 00:00Z, 2.3 hours before the alert went out and 189 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 758 m above ground
- 0-6 km bulk shear
- 95 kt
- 0-1 km storm-relative helicity
- 414 m²/s²
- 0-3 km storm-relative helicity
- 765 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Feb 11, 8:30 PM EST, 49 minutes earlier.
Area forecast discussion, Feb 11, 8:30 PM EST, 49 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Hazardous weather outlook, Feb 11, 6:57 PM EST, 2 hours 22 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 657 PM EST WED FEB 11 2009 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- 657 PM EST WED FEB 11 2009 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 SMALL CRAFT ADVISORY IS IN EFFECT THROUGH 10 PM THIS EVENING FOR THE TIDAL POTOMAC RIVER AND MARYLAND CHESAPEAKE BAY. AFTER 10 PM...A GALE WARNING IS IN EFFECT OVERNIGHT ACROSS THE MARINE WATERS. A COLD FRONT WILL MOVE ACROSS THE OUTLOOK AREA TONIGHT. SHOWERS AND ISOLATED THUNDERSTORMS WILL ACCOMPANY THE FRONT...MOST LIKELY BETWEEN 10 PM AND 2 AM. THIS ACTIVITY WILL HAVE THE POTENTIAL TO PRODUCE STRONG GUSTY WINDS. A WIND ADVISORY HAS BEEN ISSUED STARTING AT 2 AM FOR STRONG GUSTY WINDS BEHIND THE FRONTAL PASSAGE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE WIND ADVISORY WILL CONTINUE THROUGH MIDNIGHT THURSDAY NIGHT. IN ADDITION...DUE TO LOW RELATIVE HUMIDITIES AND GUSTY WINDS A FIRE WEATHER WATCH HAS BEEN ISSUED FOR THURSDAY FOR MOST OF THE AREA. A GALE WARNING CONTINUES ACROSS THE WATERS THROUGH THURSDAY EVENING. A DISTURBANCE WILL TRACK ACROSS THE REGION THIS WEEKEND...BRINGING THE POTENTIAL FOR WINTRY PRECIPITATION TO THE AREA ON SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTERS HAVE BEEN ACTIVATED. REPORTS OF WIND GUSTS OR WIND DAMAGE WOULD BE GREATLY APPRECIATED. 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- 657 PM EST WED FEB 11 2009 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...TONIGHT A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR THE POTOMAC HIGHLANDS...SHENANDOAH VALLEY...AND THE CENTRAL FOOTHILLS OF VIRGINIA UNTIL 10 PM. ANY THUNDERSTORMS THAT BECOME SEVERE WILL HAVE THE POTENTIAL TO PRODUCE DAMAGING WIND GUSTS. A COLD FRONT WILL MOVE ACROSS THE OUTLOOK AREA EARLY TONIGHT. SHOWERS AND ISOLATED THUNDERSTORMS WILL ACCOMPANY THE FRONT...MOST LIKELY BETWEEN 8 PM AND 1 AM. THIS ACTIVITY WILL HAVE THE POTENTIAL TO PRODUCE STRONG GUSTY WINDS...A FEW OF WHICH COULD REACH SEVERE LEVELS UP TO 60 MPH. A HIGH WIND WARNING HAS BEEN ISSUED FOR STRONG GUSTY WINDS UP TO 60 MPH BEHIND THE FRONTAL PASSAGE STARTING LATER THIS EVENING. THE WARNING IS IN EFFECT FOR AREAS WEST OF THE BLUE RIDGE IN VIRGINIA...AS WELL AS LOUDOUN COUNTY...THE EASTERN PANHANDLE OF WEST VIRGINIA...AND WESTERN MARYLAND INCLUDING FREDERICK COUNTY. A WIND ADVISORY IS IN EFFECT FOR AREAS EAST OF THIS FOR WINDS GUSTING UP TO 50 MPH. A WINTER WEATHER ADVISORY HAS BEEN ISSUED FOR THE FAVORED UPSLOPE AREAS OF THE ALLEGHENY AND POTOMAC HIGHLANDS STARTING AT 4 AM. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE HIGH WARNING AND WIND ADVISORY WILL CONTINUE THROUGH MIDNIGHT THURSDAY NIGHT. IN ADDITION...DUE TO LOW RELATIVE HUMIDITIES AND GUSTY WINDS A FIRE WEATHER WATCH HAS BEEN ISSUED FOR THURSDAY FOR MUCH OF THE AREA. THE WINTER WEATHER ADVISORY WILL CONTINUE THROUGH 4 PM FOR THE FAVORED UPSLOPE AREAS OF THE ALLEGHENY AND POTOMAC HIGHLANDS. A DISTURBANCE WILL TRACK ACROSS THE REGION THIS WEEKEND...BRINGING THE POTENTIAL FOR WINTRY PRECIPITATION TO THE AREA ON SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTERS HAVE BEEN ACTIVATED. REPORTS OF SNOW...WIND GUSTS...OR WIND DAMAGE WOULD BE GREATLY APPRECIATED.
In the hours before
Special weather statement, Feb 11, 7:07 PM EST, 2 hours 12 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 707 PM EST WED FEB 11 2009 VAZ021-WVZ054-120200- HIGHLAND-PENDLETON- 707 PM EST WED FEB 11 2009 ...SEVERE THUNDERSTORM WATCH IN EFFECT THIS EVENING... A LINE OF FAST MOVING HEAVY SHOWERS AND THUNDERSTORMS WILL RAPIDLY CROSS HIGHLAND AND PENDLETON COUNTIES BETWEEN 730 AND 815 PM. THE LINE IS MOVING EAST AT 60 MPH. WINDS WILL GUST FROM THE WEST BETWEEN 45 AND 65 MPH AS THE LINE MOVES THROUGH. BE PREPARED FOR TO TAKE SHELTER AFTER 730 PM. HIGH WINDS WILL CONTINUE BEHIND THE LINE THROUGH THE EVENING WITH FREQUENT WESTERLY GUSTS OVER 50 MPH. MDZ501-502-WVZ050-055-501>504-120200- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-HAMPSHIRE- HARDY-WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL- INCLUDING THE CITIES OF...FROSTBURG...CUMBERLAND...BAYARD... PETERSBURG...EMORYVILLE...HARTMANSVILLE...KEYSER...FORT ASHBY 707 PM EST WED FEB 11 2009 ...SEVERE THUNDERSTORM WATCH IN EFFECT THIS EVENING... A LINE OF FAST MOVING HEAVY SHOWERS AND THUNDERSTORMS WILL RAPIDLY CROSS GRANT...MINERAL AND ALLEGANY COUNTIES BETWEEN 745 AND 815 PM...AND MOVE ACROSS HARDY AND HAMPSHIRE COUNTIES BETWEEN 800 AND 830 PM. THIS LINE IS MOVING EAST AT 60 MPH. WINDS WILL GUST FROM THE WEST BETWEEN 45 AND 65 MPH AS THE LINE MOVES THROUGH. HIGH WINDS WILL CONTINUE BEHIND THE LINE THROUGH THE EVENING WITH FREQUENT WESTERLY GUSTS OVER 50 MPH. VAZ025>027-029-120200- AUGUSTA-ROCKINGHAM-SHENANDOAH-PAGE- INCLUDING THE CITIES OF...STAUNTON...WAYNESBORO...HARRISONBURG 707 PM EST WED FEB 11 2009 ...SEVERE THUNDERSTORM WATCH IN EFFECT THIS EVENING... A LINE OF FAST MOVING HEAVY SHOWERS AND THUNDERSTORMS WILL RAPIDLY CROSS AUGUSTA AND ROCKINGHAM COUNTIES BETWEEN 815 AND 915 PM...AND THEN ACROSS SHENANDOAH AND PAGE COUNTIES BETWEEN 845 AND 930 PM. THIS LINE IS MOVING EAST AT 60 MPH. WINDS WILL GUST FROM THE WEST BETWEEN 45 AND 65 MPH AS THE LINE MOVES THROUGH. HIGH WINDS WILL CONTINUE BEHIND THE LINE THROUGH THE EVENING WITH FREQUENT WESTERLY GUSTS OVER 50 MPH. SMZ
Local storm report, Feb 11, 8:38 PM EST, 41 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Local storm report, Feb 11, 8:51 PM EST, 28 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Local storm report, Feb 11, 8:53 PM EST, 26 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Local storm report, Feb 11, 9:06 PM EST, 13 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Special weather statement, Feb 11, 9:10 PM EST, 9 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 11, 7:22 PM EST | Severe Thunderstorm Warning | LWX | Augusta, Highland, Rockingham | 53 min |
| Feb 11, 8:10 PM EST | Severe Thunderstorm Warning | LWX | Albemarle, Augusta, Greene, Nelson, Rockingham, City of Charlottesville and 3 more | 65 min |
| Feb 11, 8:17 PM EST | Severe Thunderstorm Warning | LWX | Augusta, Frederick, Highland, Rockingham, Shenandoah, City of Winchester | 58 min |
| Feb 11, 8:35 PM EST | Severe Thunderstorm Warning | LWX | Frederick | 70 min |
| Feb 11, 8:54 PM EST | Severe Thunderstorm Warning | LWX | Clarke, Frederick, Greene, Madison, Page, Rappahannock and 2 more | 51 min |
| Feb 11, 9:33 PM EST | Severe Thunderstorm Warning | LWX | Fairfax, Fauquier, Loudoun, Prince William, Spotsylvania, Stafford and 4 more | 43 min |
| Feb 11, 9:37 PM EST | Special Marine Warning | LWX | 61 min | |
| Feb 11, 9:51 PM EST | Special Marine Warning | LWX | 39 min | |
| Feb 11, 10:07 PM EST | Severe Thunderstorm Warning | LWX | Arlington, Fairfax, City of Alexandria, City of Falls Church | 49 min |
| Feb 11, 10:14 PM EST | Special Marine Warning | LWX | 44 min | |
| Feb 12, 4:08 AM EST | Storm Warning | LWX | 12 hr | |
| Feb 12, 6:49 AM EST | Red Flag Warning | LWX | Albemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 19 more | 14 hr |
| Feb 11, 7:31 PM EST | Severe Thunderstorm Warning | LWX | Allegany | 74 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.