Alert archive / West Virginia / Flash Flood Watches in 2010

Flash Flood Watch 4, NWS Blacksburg, VA

May 12, 2010Mercer County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this flash flood watch at May 12, 2010, 10:04 AM EDT for Mercer County, Monroe County, Summers County, West Virginia. It took effect at May 12, 2010, 12:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: May 12, 2010, 10:04 AM EDT (14:04 UTC)
In effect from: May 12, 2010, 12:00 PM EDT
Expired: May 12, 2010, 8:00 PM EDT
In force: 8 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

Counties Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 76 km from the middle of the area, began a volume at 14:06 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

Roanoke, VA (KRNK), launched 12:00Z, 2.1 hours before the alert went out and 124 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: 17 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 484 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 255 m²/s²
0-3 km storm-relative helicity: 286 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 May 12, 9:54 AM EDT, 10 minutes earlier.

Area forecast discussion, May 12, 9:54 AM EDT, 10 minutes before

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Hazardous weather outlook, May 12, 3:58 AM EDT, 6 hours 6 minutes before

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The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 12, 1:51 PM EDT	Special Weather Statement	RNK	Bath	54 min
May 12, 2:17 PM EDT	Special Weather Statement	RNK	Patrick	43 min
May 12, 2:34 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Patrick	36 min
May 12, 3:04 PM EDT	Special Weather Statement	RNK	Alleghany, Bath, Botetourt, Rockbridge, City of Buena Vista, City of Covington and 1 more	41 min
May 12, 3:30 PM EDT	Special Weather Statement	RNK	Bedford, City of Roanoke	30 min
May 12, 3:47 PM EDT	Special Weather Statement	RNK	Amherst, Appomattox, Botetourt, Buckingham, Rockbridge, City of Buena Vista and 2 more	43 min
May 12, 3:52 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Appomattox, Bedford, Buckingham, City of Lynchburg	53 min
May 12, 4:10 PM EDT	Flash Flood Warning	RNK	Amherst, Appomattox, Bedford, Campbell, City of Lynchburg	81 min
May 12, 4:20 PM EDT	Severe Thunderstorm Warning	RNK	Appomattox, Bedford, Buckingham, Campbell, Charlotte, City of Lynchburg	55 min
May 12, 1:41 PM EDT	Special Weather Statement	RNK	Greenbrier	79 min

Nearby

Flash Flood Watches in West Virginia, 2010 Every flash flood watch 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.