Alert archive / Virginia / Flash Flood Watches in 2008

Flash Flood Watch 2, NWS Blacksburg, VA

August 26, 200824 counties in Virginia; 9 counties in North Carolina

NWS Blacksburg, VA issued this flash flood watch at Aug 26, 2008, 3:25 PM EDT for 24 counties in Virginia; 9 counties in North Carolina. It took effect at Aug 26, 2008, 6:00 PM EDT. It was in force for 34 hr.

The area

The counties it named.

The facts

Issued: Aug 26, 2008, 3:25 PM EDT (19:25 UTC)
In effect from: Aug 26, 2008, 6:00 PM EDT
Expired: Aug 28, 2008, 4:00 AM EDT
In force: 34 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

All 33 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, Amherst County, VA, Appomattox County, VA, Bedford County, VA, Botetourt County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Buena Vista, VA, City of Danville, VA, City of Galax, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Roanoke, VA, City of Salem, VA, Floyd County, VA, Franklin County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Patrick County, VA, Pittsylvania County, VA, Roanoke County, VA, Rockbridge County, VA

The radar

The Roanoke radar (KFCX), 28 km from the middle of the area, began a volume at 19:27 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, 7.4 hours before the alert went out and 92 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 378 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 608 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

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 Aug 26, 2:53 PM EDT, 32 minutes earlier.

Area forecast discussion, Aug 26, 2:53 PM EDT, 32 minutes before

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Hazardous weather outlook, Aug 26, 6:09 AM EDT, 9 hours 16 minutes before

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In the hours before

Special weather statement, Aug 26, 12:21 PM EDT, 3 hours 4 minutes before

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Nearby

Flash Flood Watches in Virginia, 2008 Flash Flood Watches in North Carolina, 2008 Every flash flood watch in 2008

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.