Alert archive / West Virginia / Flash Flood Warnings in 2010

Flash Flood Warning 14, NWS Blacksburg, VA

March 12, 2010Bland County, Giles County, Virginia; Mercer County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this flash flood warning at Mar 12, 2010, 9:36 PM EST for Bland County, Giles County, Virginia; Mercer County, Monroe County, Summers County, West Virginia. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 12, 2010, 9:36 PM EST (02:36 UTC)
Expired: Mar 13, 2010, 3:30 AM EST
In force: 6 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Bland County, VA, Giles County, VA, Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 68 km from the middle of the area, began a volume at 02:39 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 00:00Z, 2.6 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: 451 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 462 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Mar 12, 9:11 PM EST, 25 minutes earlier.

Area forecast discussion, Mar 12, 9:11 PM EST, 25 minutes before

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Hazardous weather outlook, Mar 12, 3:54 PM EST, 5 hours 42 minutes before

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In the hours before

Special weather statement, Mar 12, 7:40 PM EST, 1 hour 56 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
740 PM EST FRI MAR 12 2010

NCZ001>003-018>020-VAZ009-015-130145-
ALLEGHANY NC-ASHE NC-GRAYSON VA-SMYTH VA-SURRY NC-WATAUGA NC-
WILKES NC-YADKIN NC-
740 PM EST FRI MAR 12 2010

...SHOWERS WITH HEAVY RAIN WILL AFFECT ALLEGHANY...ASHE...GRAYSON...
SMYTH...SURRY...WATAUGA...WILKES AND YADKIN COUNTIES...

AT 736 PM EST...SHOWERS AND EMBEDDED THUNDERSTORMS WITH HEAVY RAIN
WERE ALONG A LINE FROM 6 MILES SOUTH OF ABINGDON TO 24 MILES
SOUTHEAST OF TAYLORSVILLE...MOVING NORTHEAST AT 30 MPH.

VERY HEAVY RAIN WILL FALL FROM THESE SHOWERS...AND WILL CAUSE WATER
TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

THESE SHOWERS WILL BE NEAR DEEP GAP AROUND 745 PM...CASCADE FALLS...
WILKESBORO RESEVOIR...TROUT...AND FLEETWOOD AROUND 750 PM...
BALDWIN...AND SUMMIT AROUND 755 PM...WEST JEFFERSON...IDLEWILD AND
AND CLIFTON AROUND 800 PM.

LAT...LON 3608 8145 3611 8158 3634 8182 3634 8173
      3653 8171 3663 8161 3690 8181 3697 8171
      3682 8128 3676 8126 3677 8115 3670 8095
      3664 8094 3656 8084 3654 8051 3628 8045
      3604 8060 3605 8100 3599 8132

EXPERIMENTAL

MC

Special weather statement, Mar 12, 8:38 PM EST, 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
838 PM EST FRI MAR 12 2010

NCZ001>003-019-020-VAZ015-130230-
ALLEGHANY NC-ASHE NC-GRAYSON VA-SURRY NC-WILKES NC-YADKIN NC-
838 PM EST FRI MAR 12 2010

...SHOWERS AND ISOLATED THUNDERSTORMS WITH HEAVY RAIN WILL AFFECT
ALLEGHANY...ASHE...GRAYSON...SURRY...WILKES AND YADKIN COUNTIES...

AT 831 PM EST...SHOWERS AND ISOLATED THUNDERSTORMS WITH HEAVY RAIN
WERE ALONG A LINE FROM 4 MILES NORTHEAST OF ASHLAND TO 7 MILES EAST
OF TAYLORSVILLE...MOVING EAST AT 25 MPH.

VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

THESE STORMS WILL BE NEAR LANSING...MOUNT JEFFERSON...OTHELLO...AND
JEFFERSON AROUND 840 PM...GRAYSON HIGHLANDS STATE PARK...GLENDALE
SPRINGS...WILKESBORO...AND CRICKET AROUND 845 PM...RUGBY AND AND
WAGONER AROUND 850 PM.

LAT...LON 3602 8122 3649 8171 3653 8171 3660 8168
      3661 8167 3672 8119 3604 8052 3605 8100
      3601 8108

EXPERIMENTAL

KK

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 12, 7:40 PM EST	Special Weather Statement	RNK	Grayson, Smyth	65 min
Mar 12, 8:20 PM EST	Areal Flood Warning	RNK	Bland, Pulaski, Wythe	6 hr
Mar 12, 8:38 PM EST	Special Weather Statement	RNK	Grayson	52 min
Mar 12, 9:51 PM EST	Special Weather Statement	RNK	Grayson, Smyth, Wythe, City of Galax	69 min
Mar 12, 10:28 PM EST	Areal Flood Warning	RNK	Bland, Carroll, Grayson, Tazewell, Wythe, City of Galax	6 hr
Mar 12, 11:35 PM EST	Special Weather Statement	RNK	Henry, Patrick, City of Martinsville	55 min
Mar 13, 12:32 AM EST	Special Weather Statement	RNK	Henry, City of Danville, City of Martinsville	58 min
Mar 13, 1:38 AM EST	Flash Flood Warning	RNK	Bland, Pulaski, Tazewell, Wythe	6 hr
Mar 13, 3:32 AM EST	Flash Flood Warning	RNK	Giles, Pulaski, City of Radford	4 hr
Mar 13, 3:43 AM EST	Flash Flood Warning	RNK	Carroll, City of Galax	2 hr
Mar 13, 4:53 AM EST	Areal Flood Warning	RNK	Alleghany, Bath, Bedford, Botetourt, Craig, Rockbridge and 3 more	6 hr
Mar 13, 7:34 AM EST	Flash Flood Warning	RNK	Bland, Giles, Pulaski, Tazewell, Wythe	6 hr
Mar 13, 8:29 AM EST	Areal Flood Warning	RNK	Montgomery, Roanoke, City of Salem	12 hr
Mar 13, 10:33 AM EST	River Flood Warning	RNK	Giles	17 hr
Mar 13, 1:06 PM EST	Areal Flood Warning	RNK	Bland, Giles, Montgomery, Pulaski, Tazewell, Wythe	14 hr
Mar 13, 1:37 PM EST	Special Weather Statement	RNK	Floyd, Patrick	53 min
Mar 13, 2:16 PM EST	Special Weather Statement	RNK	Carroll, Floyd, Patrick	59 min
Mar 13, 2:22 PM EST	Special Weather Statement	RNK	Henry, City of Martinsville	53 min
Mar 13, 4:20 PM EST	Areal Flood Warning	RNK	Alleghany, Botetourt, Craig	6 hr
Mar 13, 4:56 PM EST	Special Weather Statement	RNK	Pittsylvania, City of Danville, City of Martinsville	64 min
Mar 13, 6:35 PM EST	Special Weather Statement	RNK	Charlotte, Halifax, Pittsylvania, City of Danville	70 min
Mar 13, 3:15 PM EST	Special Weather Statement	RNK	Rockingham	45 min
Mar 13, 4:25 AM EST	Flash Flood Warning	RNK	Greenbrier	9 hr

Nearby

Flash Flood Warnings in West Virginia, 2010 Flash Flood Warnings in Virginia, 2010 Every flash flood 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.