Alert archive / Virginia / Flood Watches in 2008

Flood Watch 2, NWS Blacksburg, VA

April 4, 2008Bland County, Smyth County, Tazewell County, Virginia; Mercer County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this flood watch at Apr 4, 2008, 3:52 AM EDT for Bland County, Smyth County, Tazewell County, Virginia; Mercer County, Monroe County, Summers County, West Virginia. It took effect at Apr 4, 2008, 12:00 PM EDT. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued: Apr 4, 2008, 3:52 AM EDT (07:52 UTC)
In effect from: Apr 4, 2008, 12:00 PM EDT
Expired: Apr 5, 2008, 12:30 AM EDT
In force: 13 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

Counties Bland County, VA, Smyth County, VA, Tazewell County, VA, Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 81 km from the middle of the area, began a volume at 07:53 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 7.9 hours before the alert went out and 333 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 504 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 317 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this 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 flood watch went out at Apr 4, 3:22 AM EDT, 30 minutes earlier.

Area forecast discussion, Apr 4, 3:22 AM EDT, 30 minutes before

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Nearby

Flood Watches in Virginia, 2008 Flood Watches in West Virginia, 2008 Every 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.