Alert archive / Virginia / Flash Flood Watches in 2009
Flash Flood Watch 1, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood watch at May 26, 2009, 12:07 PM EDT for 32 counties in Virginia; 9 counties in North Carolina. It was in force for 20 hr.
The area
The counties it named.
The facts
- Issued
- May 26, 2009, 12:07 PM EDT (16:07 UTC)
- Expired
- May 27, 2009, 8:00 AM EDT
- In force
- 20 hr
- Issued by
- NWS Blacksburg, VA
- Flood severity
- None
All 41 counties
Alleghany County, NC, Ashe County, NC, Caswell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Bath County, VA, Bedford County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Buena Vista, VA, City of Covington, VA, City of Danville, VA, City of Galax, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA
The radar
The Roanoke radar (KFCX), 26 km from the middle of the area, began a volume at 16:08 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 nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 4.1 hours before the alert went out and 107 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
- 254 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 478 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at May 26, 12:01 PM EDT, 6 minutes earlier.
Area forecast discussion, May 26, 12:01 PM EDT, 6 minutes before
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Local storm report, May 26, 6:38 AM EDT, 5 hours 29 minutes before
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</html>Local storm report, May 26, 10:14 AM EDT, 1 hour 53 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 |
|---|---|---|---|---|
| May 25, 8:26 PM EDT | Special Weather Statement | RNK | Halifax | 34 min |
| May 25, 9:37 PM EDT | Special Weather Statement | RNK | Halifax | 23 min |
| May 26, 4:08 AM EDT | Special Weather Statement | RNK | Carroll, Grayson, City of Galax | 52 min |
| May 26, 11:35 AM EDT | Special Weather Statement | RNK | Giles | 55 min |
| May 26, 7:04 PM EDT | Special Weather Statement | RNK | Floyd, Montgomery | 56 min |
| May 26, 1:01 AM EDT | Special Weather Statement | RNK | Wilkes | 2 hr |
| May 26, 3:07 AM EDT | Flash Flood Warning | RNK | Wilkes | 10 hr |
Nearby
Flash Flood Watches in Virginia, 2009Flash Flood Watches in North Carolina, 2009Every flash flood watch 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.