Alert archive / Virginia / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 175, NWS Blacksburg, VA

July 11, 20094 counties in Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 11, 2009, 4:07 PM EDT for 4 counties in Virginia. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 11, 2009, 4:07 PM EDT (20:07 UTC)
Expired: Jul 11, 2009, 4:51 PM EDT
In force: 44 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Campbell County, VA, Charlotte County, VA, Halifax County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 111 km from the middle of the area, began a volume at 20:08 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.1 hours before the alert went out and 264 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: 29 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 129 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 severe thunderstorm 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 severe thunderstorm warning went out at Jul 11, 2:02 PM EDT, 2 hours 5 minutes earlier.

Area forecast discussion, Jul 11, 2:02 PM EDT, 2 hours 5 minutes before

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Hazardous weather outlook, Jul 11, 5:06 AM EDT, 11 hours 1 minute before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
506 AM EDT SAT JUL 11 2009

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-120915-
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-
506 AM EDT SAT JUL 11 2009

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...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 11, 3:06 PM EDT, 1 hour 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
306 PM EDT SAT JUL 11 2009

NCZ003>005-019-020-VAZ032>034-043-044-112000-
BEDFORD VA-FRANKLIN VA-HENRY VA-PATRICK VA-PITTSYLVANIA VA-
ROCKINGHAM NC-STOKES NC-SURRY NC-WILKES NC-YADKIN NC-
306 PM EDT SAT JUL 11 2009

...STRONG THUNDERSTORMS WILL AFFECT BEDFORD...CITY OF DANVILLE...CITY
OF MARTINSVILLE...FRANKLIN...HENRY...PATRICK...PITTSYLVANIA...
ROCKINGHAM...STOKES...SURRY...WILKES AND YADKIN COUNTIES...

AT 305 PM EDT...STRONG THUNDERSTORMS WERE SCATTERED ALONG AND
SOUTHEAST OF A LINE FROM 4 MILES NORTHEAST OF PENHOOK TO
WILKESBORO...MOVING SOUTHEAST AT 20 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. VERY HEAVY RAIN
WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO POND ON ROADS
AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. EXPECT FREQUENT
CLOUD TO GROUND LIGHTNING FROM THESE STORMS. DO NOT STAY IN THE OPEN
OR SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES.

LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER
UPDATES OR POSSIBLE WARNINGS.

LAT...LON 3618 8134 3715 7954 3667 7919 3655 7946
      3655 7951 3652 7951 3624 8013 3625 8045
      3612 8044 3606 8052 3605 8100 3602 8105

EXPERIMENTAL

PH

Special weather statement, Jul 11, 3:56 PM EDT, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
356 PM EDT SAT JUL 11 2009

VAZ033-112100-
FRANKLIN VA-
356 PM EDT SAT JUL 11 2009

...STRONG THUNDERSTORMS WILL AFFECT FRANKLIN COUNTY...

AT 356 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 4 MILES
SOUTHWEST OF BOONES MILL TO 3 MILES SOUTH OF FERRUM...MOVING EAST AT
15 MPH.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.
VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.
EXPECT FREQUENT CLOUD TO GROUND LIGHTNING FROM THESE STORMS. DO NOT
STAY IN THE OPEN OR SEEK SHELTER UNDER TREES WHEN LIGHTNING
THREATENS...MOVE INDOORS WHEN A THUNDERSTORM APPROACHES.

THESE STORMS WILL BE NEAR BOONES MILL...ROCKY MOUNT...AND OAK LEVEL
AROUND 415 PM...WIRTZ AROUND 420 PM...BURNT CHIMNEY...AND
SYDNORSVILLE AROUND 440 PM...SONTAG AROUND 445 PM...WESTERN SMITH
MOUNTAIN LAKE AROUND 450 PM AND SNOW CREEK AROUND 455 PM.

LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER
UPDATES OR POSSIBLE WARNINGS.

LAT...LON 3681 7990 3683 7998 3682 8000 3682 8005
      3698 8001 3712 8008 3712 7966 3698 7961
      3684 7964 3680 7974

EXPERIMENTAL

PH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 8:38 PM EDT	Special Weather Statement	RNK	City of Galax	22 min
Jul 11, 1:42 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Patrick, City of Martinsville	63 min
Jul 11, 2:51 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Patrick	54 min
Jul 11, 3:06 PM EDT	Special Weather Statement	RNK	Henry, Patrick, Pittsylvania, City of Danville, City of Martinsville	54 min
Jul 11, 3:56 PM EDT	Special Weather Statement	RNK	Franklin	64 min
Jul 11, 6:10 PM EDT	Special Weather Statement	RNK	Pittsylvania, City of Martinsville	65 min
Jul 10, 8:24 PM EDT	Special Weather Statement	RNK	Wilkes	36 min
Jul 10, 10:08 PM EDT	Special Weather Statement	RNK	Wilkes	52 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2009 Every severe thunderstorm warning 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.