Alert archive / West Virginia / Flash Flood Watches in 2009

Flash Flood Watch 8, NWS Blacksburg, VA

July 26, 2009Tazewell County, Virginia; Mercer County, Summers County, West Virginia

NWS Blacksburg, VA issued this flash flood watch at Jul 26, 2009, 9:59 AM EDT for Tazewell County, Virginia; Mercer County, Summers County, West Virginia. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Jul 26, 2009, 9:59 AM EDT (13:59 UTC)
Expired: Jul 26, 2009, 2:11 PM EDT
In force: 4 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

Counties Tazewell County, VA, Mercer County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 90 km from the middle of the area, began a volume at 14:03 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 12:00Z, 2.0 hours before the alert went out and 322 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: 161 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 852 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Jul 26, 9:40 AM EDT, 19 minutes earlier.

Area forecast discussion, Jul 26, 9:40 AM EDT, 19 minutes before

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Hazardous weather outlook, Jul 26, 4:12 AM EDT, 5 hours 47 minutes before

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In the hours before

Special weather statement, Jul 26, 8:44 AM EDT, 1 hour 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
844 AM EDT SUN JUL 26 2009

VAZ007-WVZ042-261445-
TAZEWELL-MERCER-
INCLUDING THE CITIES OF...TAZEWELL...BLUEFIELD...FLAT TOP
844 AM EDT SUN JUL 26 2009

...CONTINUED RAINFALL MAY RESULT IN MINOR FLOODING...

NUMEROUS SHOWERS AND AN ISOLATED THUNDERSTORM OR TWO WILL
CONTINUE TO TRACK OVER RICHLANDS...TAZEWELL...BLUEFIELD...PRINCETON
AND SURROUNDING AREAS THROUGH AT LEAST MID MORNING. RAINFALL THIS
MORNING HAS NOT BEEN PARTICULARLY HEAVY...HOWEVER AN ADDITIONAL
INCH TO INCH AND A HALF IS POSSIBLE IN SOME LOCATIONS THROUGH
11:00 AM EDT...AND THIS WOULD BE ENOUGH TO CAUSE PONDING OF WATER
ON ROADWAYS AND IN LOW LYING AREAS...ESPECIALLY IN URBAN LOCATIONS
AND AREAS THAT HAVE KNOWN DRAINAGE PROBLEMS.

DO NOT ATTEMPT TO DRIVE THROUGH WATER IF IT IS FLOWING ACROSS THE
ROAD. SLOW DOWN IF TRAVELING IN HEAVY RAIN AS STANDING WATER CAN
CAUSE HYDROPLANING.

LISTEN TO NOAA WEATHER RADIO OR YOUR LOCAL MEDIA FOR THE LATER
UPDATES ON THIS SITUATION.

SK

Local storm report, Jul 26, 8:51 AM EDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
851 AM EDT SUN JUL 26 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0849 PM     TSTM WND DMG     CLIFTON FORGE CITY      37.82N 79.83W
07/25/2009                   ALLEGHANY          VA   LAW ENFORCEMENT

            TREE DOWN ON BYRD STREET

&&

TW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 8:16 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Bath, Botetourt, City of Covington	59 min
Jul 25, 8:30 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Giles, Tazewell	90 min
Jul 25, 8:47 PM EDT	Special Weather Statement	RNK	Botetourt	58 min
Jul 25, 8:56 PM EDT	Special Weather Statement	RNK	Bland, Tazewell	64 min
Jul 25, 9:06 PM EDT	Special Weather Statement	RNK	Amherst, Rockbridge, City of Buena Vista, City of Lexington	84 min
Jul 25, 9:16 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Rockbridge, City of Buena Vista, City of Lexington	59 min
Jul 25, 9:34 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Smyth, Wythe	33 min
Jul 25, 10:39 PM EDT	Special Weather Statement	RNK	Montgomery, City of Radford	66 min
Jul 26, 1:12 PM EDT	Special Weather Statement	RNK	Patrick	63 min
Jul 26, 1:23 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Patrick	54 min
Jul 26, 1:32 PM EDT	Special Weather Statement	RNK	Bedford	58 min
Jul 26, 1:40 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell, Franklin, Henry, Pittsylvania	65 min
Jul 26, 2:05 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Pittsylvania, City of Martinsville	42 min
Jul 26, 2:15 PM EDT	Severe Thunderstorm Warning	RNK	Appomattox, Campbell, Charlotte, Halifax	75 min
Jul 26, 2:35 AM EDT	Special Weather Statement	RNK	Greenbrier, Monroe, Summers	55 min

Nearby

Flash Flood Watches in West Virginia, 2009 Flash Flood Watches in Virginia, 2009 Every flash flood watch in 2009

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.