Alert archive / West Virginia / Areal Flood Warnings in 2012

Areal Flood Warning 4, NWS Blacksburg, VA

April 27, 2012Mercer County, Summers County, West Virginia

NWS Blacksburg, VA issued this areal flood warning at Apr 27, 2012, 12:31 AM EDT for Mercer County, Summers County, West Virginia. It was in force for 18 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: Apr 27, 2012, 12:31 AM EDT (04:31 UTC)
Expired: Apr 27, 2012, 6:30 PM EDT
In force: 18 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Mercer County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 84 km from the middle of the area, began a volume at 04:34 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 00:00Z, 4.5 hours before the alert went out and 188 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: 1170 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 882 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 5.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal 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 areal flood warning went out at Apr 26, 11:13 PM EDT, 1 hour 18 minutes earlier.

Area forecast discussion, Apr 26, 11:13 PM EDT, 1 hour 18 minutes before

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Hazardous weather outlook, Apr 26, 3:35 PM EDT, 8 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
335 PM EDT THU APR 26 2012

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-271945-
ASHE-ALLEGHANY NC-SURRY-STOKES-ROCKINGHAM-CASWELL-WATAUGA-WILKES-
YADKIN-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-MONTGOMERY-GRAYSON-
CARROLL-FLOYD-CRAIG-ALLEGHANY VA-BATH-ROANOKE-BOTETOURT-ROCKBRIDGE-
PATRICK-FRANKLIN-BEDFORD-AMHERST-HENRY-PITTSYLVANIA-CAMPBELL-
APPOMATTOX-BUCKINGHAM-HALIFAX-CHARLOTTE-MERCER-SUMMERS-MONROE-
GREENBRIER-
335 PM EDT THU APR 26 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH
CAROLINA...NORTHWEST NORTH CAROLINA...CENTRAL VIRGINIA...SOUTH
CENTRAL VIRGINIA...SOUTHWEST VIRGINIA...WEST CENTRAL VIRGINIA AND
SOUTHEAST WEST VIRGINIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

STRONG THUNDERSTORMS ARE POSSIBLE ACROSS THE REGION ON SATURDAY AS
A WARM FRONT LIFTS TOWARD THE AREA...SUPPORTED BY AN UPPER LEVEL
DISTURBANCE APPROACHING FROM THE WEST.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Local storm report, Apr 26, 10:13 PM EDT, 2 hours 18 minutes before

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Local storm report, Apr 26, 10:29 PM EDT, 2 hours 2 minutes before

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Special weather statement, Apr 26, 11:35 PM EDT, 56 minutes before

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Local storm report, Apr 26, 11:48 PM EDT, 43 minutes before

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Special weather statement, Apr 27, 12:12 AM EDT, 19 minutes before

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Special weather statement, Apr 27, 12:14 AM EDT, 17 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
Apr 26, 8:22 PM EDT	Special Weather Statement	RNK	Bland, Pulaski	53 min
Apr 26, 9:17 PM EDT	Special Weather Statement	RNK	Bland, Pulaski	58 min
Apr 27, 12:46 AM EDT	Areal Flood Warning	RNK	Bland, Tazewell	6 hr
Apr 27, 6:44 AM EDT	Areal Flood Advisory	RNK	Bland, Tazewell	3 hr
Apr 27, 9:32 AM EDT	Areal Flood Advisory	RNK	Bland, Tazewell	3 hr
Apr 27, 4:12 PM EDT	Frost Advisory	RNK	Bath	14 hr
Apr 26, 9:36 PM EDT	Special Weather Statement	RNK	Watauga, Wilkes	54 min
Apr 26, 11:35 PM EDT	Special Weather Statement	RNK	Alleghany	55 min
Apr 27, 12:12 AM EDT	Special Weather Statement	RNK	Ashe	63 min
Apr 27, 12:14 AM EDT	Special Weather Statement	RNK	Alleghany	46 min

Nearby

Areal Flood Warnings in West Virginia, 2012 Every areal flood warning in 2012

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.