Alert archive / Virginia / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 231, NWS Blacksburg, VA
NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 20, 2010, 4:15 PM EDT for Halifax County, Pittsylvania County, City of Danville, Virginia. It was in force for 60 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
- Jul 20, 2010, 4:15 PM EDT (20:15 UTC)
- Expired
- Jul 20, 2010, 5:15 PM EDT
- In force
- 60 min
- Issued by
- NWS Blacksburg, VA
- Area
- Storm-based polygon
Counties City of Danville, VA, Halifax County, VA, Pittsylvania County, VA
The radar
The Roanoke radar (KFCX), 98 km from the middle of the area, began a volume at 20:16 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 |
|---|---|---|---|
| Jul 20, 1:29 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Roanoke, VA (KRNK), launched 12:00Z, 8.3 hours before the alert went out and 58 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
- 922 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 707 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.8
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 Blacksburg, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 2:56 PM EDT, 1 hour 19 minutes earlier.
Area forecast discussion, Jul 20, 2:56 PM EDT, 1 hour 19 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BLACKSBURG VA 203 PM EDT TUE JUL 20 2010 NCZ001>003-018-019-VAZ007-009>020-022>024-032>035-WVZ042>045-211815- ASHE-ALLEGHANY NC-SURRY-WATAUGA-WILKES-TAZEWELL-SMYTH-BLAND-GILES- WYTHE-PULASKI-MONTGOMERY-GRAYSON-CARROLL-FLOYD-CRAIG-ALLEGHANY VA- BATH-ROANOKE-BOTETOURT-ROCKBRIDGE-PATRICK-FRANKLIN-BEDFORD-AMHERST- MERCER-SUMMERS-MONROE-GREENBRIER- 203 PM EDT TUE JUL 20 2010 ...SEVERE THUNDERSTORM WATCH 502 IN EFFECT UNTIL 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH CAROLINA...NORTHWEST NORTH CAROLINA...CENTRAL VIRGINIA...SOUTH CENTRAL VIRGINIA...SOUTHWEST VIRGINIA...WEST CENTRAL VIRGINIA AND SOUTHEAST WEST VIRGINIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING. THE PRIMARY THREAT FROM ANY SEVERE STORMS IS DAMAGING WINDS. VERY HEAVY RAIN IS ALSO LIKELY WITH ANY OF THE STORMS TODAY. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THUNDERSTORMS COULD BE SEVERE AND MAY PRODUCE DAMAGING WIND GUSTS WEDNESDAY AND THURSDAY. NUMEROUS STORMS MOVING OVER THE SAME AREA MAY LEAD TO FLASH FLOODING. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. NCZ004>006-020-VAZ043>047-058-059-211815- STOKES-ROCKINGHAM-CASWELL-YADKIN-HENRY-PITTSYLVANIA-CAMPBELL- APPOMATTOX-BUCKINGHAM-HALIFAX-CHARLOTTE- 203 PM EDT TUE JUL 20 2010 ...SEVERE THUNDERSTORM WATCH 502 IN EFFECT UNTIL 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH CAROLINA...NORTHWEST NORTH CAROLINA...CENTRAL VIRGINIA AND SOUTH CENTRAL VIRGINIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING. THE PRIMARY THREAT FROM ANY SEVERE STORMS IS DAMAGING WINDS. VERY HEAVY RAIN IS ALSO LIKELY WITH ANY OF THE STORMS TODAY. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THUNDERSTORMS COULD BE SEVERE AND MAY PRODUCE DAMAGING WIND GUSTS WEDNESDAY AND THURSDAY. NUMEROUS STORMS MOVING OVER THE SAME AREA MAY LEAD TO FLASH FLOODING. ON SATURDAY...THE COMBINATION OF THE TEMPERATURE AND HUMIDITY MAY CAUSE THE HEAT INDEX TO BE BETWEEN 105 AND 108 DEGREES FOR A FEW HOURS LATE IN THE AFTERNOON. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
In the hours before
Special weather statement, Jul 20, 2:55 PM EDT, 1 hour 20 minutes before
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</html>Local storm report, Jul 20, 3:06 PM EDT, 1 hour 9 minutes before
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</html>Special weather statement, Jul 20, 3:25 PM EDT, 50 minutes before
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</html>Special weather statement, Jul 20, 3:32 PM EDT, 43 minutes before
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</html>Local storm report, Jul 20, 3:54 PM EDT, 21 minutes before
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</html>The office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 11:54 AM EDT | Special Weather Statement | RNK | Halifax | 66 min |
| Jul 20, 12:57 PM EDT | Special Weather Statement | RNK | Tazewell | 63 min |
| Jul 20, 2:06 PM EDT | Special Weather Statement | RNK | Bland, Giles, Pulaski, Wythe | 54 min |
| Jul 20, 2:24 PM EDT | Severe Thunderstorm Warning | RNK | Craig, Giles, Montgomery, Pulaski, City of Radford | 66 min |
| Jul 20, 2:47 PM EDT | Severe Thunderstorm Warning | RNK | Floyd, Montgomery, Pulaski | 58 min |
| Jul 20, 2:55 PM EDT | Special Weather Statement | RNK | Henry, Patrick | 65 min |
| Jul 20, 3:25 PM EDT | Special Weather Statement | RNK | Botetourt | 35 min |
| Jul 20, 3:32 PM EDT | Special Weather Statement | RNK | Patrick | 58 min |
| Jul 20, 3:47 PM EDT | Severe Thunderstorm Warning | RNK | Henry, Patrick | 58 min |
| Jul 20, 4:06 PM EDT | Severe Thunderstorm Warning | RNK | Amherst, Bedford, Campbell, Rockbridge, City of Buena Vista, City of Lexington and 1 more | 54 min |
| Jul 20, 5:00 PM EDT | Special Weather Statement | RNK | Appomattox, Buckingham | 60 min |
| Jul 20, 5:09 PM EDT | Severe Thunderstorm Warning | RNK | Appomattox, Buckingham | 54 min |
| Jul 20, 5:14 PM EDT | Severe Thunderstorm Warning | RNK | Charlotte, Halifax, Pittsylvania, City of Danville | 61 min |
| Jul 20, 5:19 PM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Bath | 56 min |
| Jul 20, 3:12 PM EDT | Special Weather Statement | RNK | Yadkin | 63 min |
| Jul 20, 4:44 PM EDT | Special Weather Statement | RNK | Caswell, Rockingham | 61 min |
| Jul 20, 4:55 PM EDT | Severe Thunderstorm Warning | RNK | Caswell, Rockingham | 65 min |
| Jul 20, 7:30 PM EDT | Special Weather Statement | RNK | Ashe | 45 min |
| Jul 20, 4:20 PM EDT | Special Weather Statement | RNK | Greenbrier | 55 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 2010Every severe thunderstorm warning in 2010
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.