Alert archive / Virginia / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 252, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 31, 2012, 7:51 PM EDT for Augusta County, Virginia. It was in force for 39 min. 1 report 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
- Jul 31, 2012, 7:51 PM EDT (23:51 UTC)
- Expired
- Jul 31, 2012, 8:30 PM EDT
- In force
- 39 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
County Augusta County, VA
The radar
The Roanoke radar (KFCX), 166 km from the middle of the area, began a volume at 23:54 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 |
|---|---|---|---|
| Jul 31, 7:51 PM EDT | TSTM WND DMG | 3 Ne Augusta Springs, VA | TREE DOWN AT THE 800 BLOCK OF LITTLE CALF PASTURE HIGHWAY DUE TO STRONG THUNDERSTORM WINDS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Roanoke, VA (KRNK), launched 12:00Z, 11.9 hours before the alert went out and 119 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
- 384 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 804 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
639 WUUS51 KLWX 312351 SVRLWX VAC015-010030- /O.NEW.KLWX.SV.W.0252.120731T2351Z-120801T0030Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 751 PM EDT TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN AUGUSTA COUNTY IN WESTERN VIRGINIA... * UNTIL 830 PM EDT * AT 747 PM EDT...A SEVERE THUNDERSTORM WAS DETECTED 5 MILES SOUTHWEST OF BUFFALO GAP...AND WAS MOVING NORTHEAST AT 20 MPH. THIS STORM IS CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF QUARTERS AND DAMAGING WINDS IN EXCESS OF 60 MPH. * LOCATIONS IMPACTED INCLUDE... BUFFALO GAP... 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 3839 7917 3827 7897 3805 7928 3812 7937 TIME...MOT...LOC 2351Z 221DEG 18KT 3814 7928 $$ HTS
2 follow-up statements
602 WWUS51 KLWX 010013 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 813 PM EDT TUE JUL 31 2012 VAC015-010030- /O.CON.KLWX.SV.W.0252.000000T0000Z-120801T0030Z/ AUGUSTA VA- 813 PM EDT TUE JUL 31 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT FOR AUGUSTA COUNTY... AT 808 PM EDT...A SEVERE THUNDERSTORM WAS DETECTED NEAR BUFFALO GAP...AND WAS MOVING NORTHEAST AT 20 MPH. THIS STORM IS CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF QUARTERS AND DAMAGING WINDS IN EXCESS OF 60 MPH. LOCATIONS IMPACTED INCLUDE... CHURCHVILLE... MOSCOW... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE NATIONAL WEATHER SERVICE. LAT...LON 3808 7924 3815 7934 3839 7917 3827 7897 TIME...MOT...LOC 0013Z 221DEG 16KT 3820 7921 $$ HTS
615 WWUS51 KLWX 010024 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 824 PM EDT TUE JUL 31 2012 VAC015-010034- /O.EXP.KLWX.SV.W.0252.000000T0000Z-120801T0030Z/ AUGUSTA VA- 824 PM EDT TUE JUL 31 2012 ...THE SEVERE THUNDERSTORM WARNING WILL EXPIRE AT 830 PM EDT FOR AUGUSTA COUNTY... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED. THUS THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO EXPIRE. LAT...LON 3808 7924 3815 7934 3839 7917 3828 7896 TIME...MOT...LOC 0024Z 221DEG 16KT 3824 7917 $$ HTS
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 8:03 PM EDT | Special Weather Statement | LWX | Highland | 27 min |
| Jul 30, 8:27 PM EDT | Coastal Flood Advisory | LWX | Arlington, City of Alexandria, City of Falls Church | 13 hr |
| Jul 31, 3:50 AM EDT | Special Marine Warning | LWX | 85 min | |
| Jul 31, 3:01 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 29 min |
| Jul 31, 3:20 PM EDT | Special Weather Statement | LWX | City of Winchester | 40 min |
| Jul 31, 5:04 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 20 min |
| Jul 31, 5:27 PM EDT | Special Weather Statement | LWX | Fairfax, Prince William, City of Fairfax, City of Manassas, City of Manassas Park | 33 min |
| Jul 31, 5:45 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, City of Fairfax | 45 min |
| Jul 31, 6:03 PM EDT | Special Weather Statement | LWX | City of Charlottesville | 42 min |
| Jul 31, 6:23 PM EDT | Special Marine Warning | LWX | 44 min | |
| Jul 31, 6:28 PM EDT | Special Marine Warning | LWX | 38 min | |
| Jul 31, 6:47 PM EDT | Special Weather Statement | LWX | Orange | 28 min |
| Jul 31, 6:48 PM EDT | Special Weather Statement | LWX | Fauquier | 42 min |
| Jul 31, 6:56 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Fauquier | 49 min |
| Jul 31, 7:12 PM EDT | Special Weather Statement | LWX | Orange | 33 min |
| Jul 31, 7:20 PM EDT | Special Weather Statement | LWX | Greene | 25 min |
| Jul 31, 7:29 PM EDT | Special Weather Statement | LWX | Shenandoah | 61 min |
| Jul 31, 7:36 PM EDT | Special Weather Statement | LWX | Culpeper | 39 min |
| Jul 31, 7:45 PM EDT | Special Weather Statement | LWX | Augusta | 45 min |
| Jul 31, 7:54 PM EDT | Special Weather Statement | LWX | Page | 51 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 2012Every severe thunderstorm warning in 2012
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.