Alert archive / Virginia / Special Weather Statements in 2011

Special Weather Statement, NWS Blacksburg, VA

August 13, 2011Halifax County, Virginia

NWS Blacksburg, VA issued this special weather statement at Aug 13, 2011, 9:13 AM EDT for Halifax County, Virginia. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 13, 2011, 9:13 AM EDT (13:13 UTC)
Expired: Aug 13, 2011, 10:00 AM EDT
In force: 47 min
Issued by: NWS Blacksburg, VA

County Halifax County, VA

The radar

The Raleigh/Durham radar (KRAX), 114 km from the middle of the area, began a volume at 13:13 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, 1.2 hours before the alert went out and 90 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: 486 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 564 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 13, 7:44 AM EDT, 1 hour 29 minutes earlier.

Area forecast discussion, Aug 13, 7:44 AM EDT, 1 hour 29 minutes before

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Hazardous weather outlook, Aug 13, 4:43 AM EDT, 4 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
443 AM EDT SAT AUG 13 2011

NCZ001>003-018>020-VAZ007-009>020-022>024-032>035-WVZ042>045-141000-
ASHE-ALLEGHANY NC-SURRY-WATAUGA-WILKES-YADKIN-TAZEWELL-SMYTH-BLAND-
GILES-WYTHE-PULASKI-MONTGOMERY-GRAYSON-CARROLL-FLOYD-CRAIG-
ALLEGHANY VA-BATH-ROANOKE-BOTETOURT-ROCKBRIDGE-PATRICK-FRANKLIN-
BEDFORD-AMHERST-MERCER-SUMMERS-MONROE-GREENBRIER-
443 AM EDT SAT AUG 13 2011

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.

A SOUTHEAST TO SOUTH FLOW OFF THE ATLANTIC WILL BRING INCREASING
MOISTURE INTO THE AREA TODAY. NUMEROUS SHOWERS AND THUNDERSTORMS
ARE EXPECTED...AND ANY THUNDERSTORM WILL BRING HEAVY DOWNPOURS.
LATER TONIGHT INTO SUNDAY...AN UNSEASONABLY STRONG COLD FRONT WILL
APPROACH OUR REGION...TRIGGERING MORE WIDESPREAD SHOWERS AND
THUNDERSTORMS. PROLONGED PERIODS OF HEAVY RAIN WILL BE
POSSIBLE...WHICH MAY LEAD TO LOCALIZED FLASH FLOODING. A FEW OF
THE STORMS THIS AFTERNOON AND EVENING MAY BECOME STRONG ENOUGH TO
PRODUCE DAMAGING WINDS.

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

A STRONG COLD FRONT WILL MOVE THROUGH THE AREA SUNDAY. WIDESPREAD
SHOWERS AND THUNDERSTORMS MAY PRODUCE AREAS OF LOCALLY HEAVY
RAINFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NCZ004>006-VAZ043>047-058-059-141000-
STOKES-ROCKINGHAM-CASWELL-HENRY-PITTSYLVANIA-CAMPBELL-APPOMATTOX-
BUCKINGHAM-HALIFAX-CHARLOTTE-
443 AM EDT SAT AUG 13 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH
CAROLINA...CENTRAL VIRGINIA AND SOUTH CENTRAL VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

A SOUTHEAST TO SOUTH FLOW OFF THE ATLANTIC WILL BRING INCREASING
MOISTURE INTO THE AREA TODAY. NUMEROUS SHOWERS AND THUNDERSTORMS
ARE EXPECTED...AND ANY THUNDERSTORM WILL BRING HEAVY DOWNPOURS.
LATER TONIGHT INTO SUNDAY...AN UNSEASONABLY STRONG COLD FRONT WILL
APPROACH OUR REGION...TRIGGERING MORE WIDESPREAD SHOWERS AND
THUNDERSTORMS. PROLONGED PERIODS OF HEAVY RAIN WILL BE
POSSIBLE...WHICH MAY LEAD TO LOCALIZED FLASH FLOODING. A FEW OF
THE STORMS THIS AFTERNOON AND EVENING MAY BECOME STRONG ENOUGH TO
PRODUCE DAMAGING WINDS.

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

A STRONG COLD FRONT WILL MOVE THROUGH THE AREA SUNDAY. WIDESPREAD
SHOWERS AND THUNDERSTORMS MAY PRODUCE AREAS OF LOCALLY HEAVY
RAINFALL. IN ADDITION...THERE IS A SLIGHT RISK OF SEVERE
THUNDERSTORMS. SOME OF THE STORMS MAY BECOME STRONG ENOUGH TO
PRODUCE DAMAGING WINDS OR LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Aug 13, 9:13 AM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
913 AM EDT SAT AUG 13 2011

VAZ058-131400-
HALIFAX VA-
913 AM EDT SAT AUG 13 2011

...A STRONG THUNDERSTORM WILL AFFECT HALIFAX COUNTY...

AT 900 AM EDT...A STRONG THUNDERSTORM WAS LOCATED 10 MILES SOUTH OF
SOUTH BOSTON...NEAR THE VIRGINIA...NORTH CAROLINA BORDER...MOVING
NORTHEAST AT 15 MPH.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.
RADAR ESTIMATES THAT 2 INCHES OF RAIN HAS ALREADY FALLEN NEAR THE
VIRGINIA...NORTH CAROLINA BORDER.  RAPID STREAM RISES ARE LIKELY
ALONG POWELLS CREEK...AND COLEMAN CREEK.

OCCASIONAL CLOUD TO GROUND LIGHTNING IS ASSOCIATED WITH THIS STORM.
THIS STORM WILL BE NEAR CLUSTER SPRINGS AND VIRGILINA AROUND 930
AM...SOUTH BOSTON AROUND 950 AM AND SCOTTSBURG AROUND 1000 AM...THEN
CROSSING THE KERR RESERVOIR AND STAUNTON RIVER STATE PARK BETWEEN
1000 AM AND 1100 AM.

IF YOU ARE OUT ON THE WATER GET BACK TO LAND AND FIND A SAFE
BUILDING OR SAFE VEHICLE.

LAT...LON 3663 7858 3669 7865 3669 7867 3665 7870
      3654 7872 3653 7875 3653 7912 3655 7913
      3691 7874 3681 7867 3680 7868 3676 7867
      3674 7869 3663 7855

PEM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 8:01 PM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	29 min
Aug 12, 9:22 PM EDT	Special Weather Statement	RNK	City of Roanoke	23 min
Aug 12, 9:42 PM EDT	Special Weather Statement	RNK	City of Roanoke	48 min
Aug 13, 11:52 AM EDT	Special Weather Statement	RNK	Appomattox, Buckingham	53 min
Aug 13, 1:43 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Grayson, City of Galax	62 min
Aug 13, 1:53 PM EDT	Special Weather Statement	RNK	Montgomery, City of Radford	67 min
Aug 13, 2:19 PM EDT	Special Weather Statement	RNK	Pulaski	26 min
Aug 13, 2:51 PM EDT	Special Weather Statement	RNK	Floyd	24 min
Aug 13, 3:17 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Franklin, Patrick	58 min
Aug 13, 3:43 PM EDT	Severe Thunderstorm Warning	RNK	Montgomery, Pulaski	30 min
Aug 13, 3:44 PM EDT	Severe Thunderstorm Warning	RNK	Grayson	21 min
Aug 13, 3:51 PM EDT	Special Weather Statement	RNK	City of Covington	24 min
Aug 13, 4:14 PM EDT	Special Weather Statement	RNK	Patrick	31 min
Aug 13, 4:16 PM EDT	Special Weather Statement	RNK	City of Radford	29 min
Aug 13, 4:44 PM EDT	Special Weather Statement	RNK	Patrick	31 min
Aug 13, 4:45 PM EDT	Special Weather Statement	RNK	Craig	30 min
Aug 13, 4:50 PM EDT	Special Weather Statement	RNK	Tazewell	40 min
Aug 13, 5:15 PM EDT	Special Weather Statement	RNK	Patrick	30 min
Aug 13, 5:55 PM EDT	Severe Thunderstorm Warning	RNK	Patrick	37 min
Aug 13, 6:01 PM EDT	Special Weather Statement	RNK	Grayson, Wythe	29 min
Aug 13, 6:29 PM EDT	Special Weather Statement	RNK	Grayson	31 min
Aug 12, 9:02 PM EDT	Special Weather Statement	RNK	Watauga	28 min
Aug 13, 2:21 PM EDT	Special Weather Statement	RNK	Caldwell	24 min
Aug 13, 2:37 PM EDT	Special Weather Statement	RNK	Surry	23 min
Aug 13, 2:49 PM EDT	Special Weather Statement	RNK	Ashe	26 min
Aug 13, 3:41 PM EDT	Severe Thunderstorm Warning	RNK	Wilkes	37 min
Aug 13, 4:19 PM EDT	Special Weather Statement	RNK	Wilkes	26 min
Aug 13, 5:50 PM EDT	Special Weather Statement	RNK	Stokes	25 min
Aug 13, 6:21 PM EDT	Special Weather Statement	RNK	Stokes	39 min
Aug 13, 7:01 PM EDT	Special Weather Statement	RNK	Stokes	29 min
Aug 13, 7:38 PM EDT	Severe Thunderstorm Warning	RNK	Surry, Yadkin	67 min

Nearby

Special Weather Statements in Virginia, 2011 Every special weather statement in 2011

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.