Alert archive / Virginia / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 430, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Sep 14, 2011, 5:14 PM EDT for 4 counties in Virginia. It was in force for 46 min. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 14, 2011, 5:14 PM EDT (21:14 UTC)
- Expired
- Sep 14, 2011, 6:00 PM EDT
- In force
- 46 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Clarke County, VA, Frederick County, VA, Shenandoah County, VA, Warren County, VA
The radar
The Sterling radar (KLWX), 66 km from the middle of the area, began a volume at 21:15 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 14, 5:42 PM EDT | HAIL 0.88 | 1 S Clary, VA | |
| Sep 14, 5:43 PM EDT | HAIL 0.75 | Strasburg, VA | |
| Sep 14, 5:57 PM EDT | TSTM WND DMG | 2 E Alonzaville, VA | TREE BLOWN DOWN BY THUNDERSTORM WIND GUST ALONG JADWYN RD NEAR THE TOWN OF WOODSTOCK. |
| Sep 14, 6:00 PM EDT | TSTM WND DMG | 1 W Maurertown, VA | TREE BLOWN DOWN BY THUNDERSTORM WIND GUST ALONG SWARTZ RD NEAR WOODSTOCK. |
| Sep 14, 6:02 PM EDT | TSTM WND DMG | 1 W Maurertown, VA | TREE BLOWN DOWN BY THUNDERSTORM WIND GUST ALONG SWARTZ RD NEAR WOODSTOCK. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.2 hours before the alert went out and 74 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
- 408 J/kg
- Mixed-layer CIN
- -181 J/kg
- Mixed-layer LCL
- 1416 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
427 WUUS51 KLWX 142114 SVRLWX VAC043-069-171-187-142200- /O.NEW.KLWX.SV.W.0430.110914T2114Z-110914T2200Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 514 PM EDT WED SEP 14 2011 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN WARREN COUNTY IN NORTHWEST VIRGINIA... NORTHEASTERN SHENANDOAH COUNTY IN NORTHWEST VIRGINIA... SOUTHWESTERN CLARKE COUNTY IN NORTHWEST VIRGINIA... SOUTHERN FREDERICK COUNTY IN NORTHWEST VIRGINIA... * UNTIL 600 PM EDT * AT 511 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF QUARTERS. THIS STORM WAS LOCATED NEAR STRASBURG...AND MOVING EAST AT 15 MPH. * LOCATIONS IMPACTED INCLUDE... STRASBURG... STEPHENS CITY... FRONT ROYAL... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE NATIONAL WEATHER SERVICE. && LAT...LON 3914 7799 3885 7820 3894 7859 3909 7848 TIME...MOT...LOC 2115Z 280DEG 14KT 3903 7841 $$ SBK
1 follow-up statement
048 WWUS51 KLWX 142148 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 548 PM EDT WED SEP 14 2011 VAC043-069-171-187-142200- /O.CON.KLWX.SV.W.0430.000000T0000Z-110914T2200Z/ WARREN VA-SHENANDOAH VA-CLARKE VA-FREDERICK VA- 548 PM EDT WED SEP 14 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT FOR FREDERICK...CLARKE...SHENANDOAH AND WARREN COUNTIES... AT 545 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF QUARTERS AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 5 MILES EAST OF STRASBURG...MOVING EAST AT 15 MPH. LOCATIONS IMPACTED INCLUDE... CEDARVILLE... NINEVEH... RIVERTON... WHITE POST... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE NATIONAL WEATHER SERVICE. && LAT...LON 3888 7826 3894 7859 3910 7837 3914 7799 TIME...MOT...LOC 2148Z 280DEG 14KT 3901 7825 $$ HTS
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 5:10 AM EDT | Small Craft Advisory | LWX | 35 hr | |
| Sep 14, 10:36 AM EDT | Coastal Flood Advisory | LWX | Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church | 13 hr |
| Sep 14, 4:07 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Shenandoah | 38 min |
| Sep 14, 4:20 PM EDT | Special Weather Statement | LWX | Rockingham, City of Harrisonburg | 40 min |
| Sep 14, 4:38 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Shenandoah | 37 min |
| Sep 14, 4:52 PM EDT | Severe Thunderstorm Warning | LWX | Rockingham, City of Harrisonburg | 38 min |
| Sep 14, 5:21 PM EDT | Severe Thunderstorm Warning | LWX | Rockingham, Shenandoah | 39 min |
| Sep 14, 5:34 PM EDT | Flash Flood Warning | LWX | Rockingham | 87 min |
| Sep 14, 5:34 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 41 min |
| Sep 14, 5:49 PM EDT | Flash Flood Warning | LWX | Clarke, Frederick, Shenandoah, Warren | 89 min |
| Sep 14, 5:57 PM EDT | Severe Thunderstorm Warning | LWX | Clarke, Frederick, Page, Shenandoah, Warren | 48 min |
| Sep 14, 6:01 PM EDT | Severe Thunderstorm Warning | LWX | Clarke, Frederick | 44 min |
| Sep 14, 6:16 PM EDT | Special Weather Statement | LWX | City of Harrisonburg | 44 min |
| Sep 14, 6:37 PM EDT | Severe Thunderstorm Warning | LWX | Clarke, Loudoun | 38 min |
| Sep 14, 6:43 PM EDT | Special Weather Statement | LWX | Warren | 47 min |
| Sep 14, 7:02 PM EDT | Special Weather Statement | LWX | Rockingham, City of Harrisonburg | 43 min |
| Sep 14, 7:10 PM EDT | Severe Thunderstorm Warning | LWX | Greene, Page, Rockingham | 33 min |
| Sep 14, 7:34 PM EDT | Special Weather Statement | LWX | Rappahannock, Warren | 41 min |
| Sep 14, 7:54 PM EDT | Special Weather Statement | LWX | Page, Rappahannock | 51 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 2011Every severe thunderstorm warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.