Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Blacksburg, VA

July 18, 2012Grayson County, Virginia

NWS Blacksburg, VA issued this special weather statement at Jul 18, 2012, 12:35 PM EDT for Grayson County, Virginia. It was in force for 40 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: Jul 18, 2012, 12:35 PM EDT (16:35 UTC)
Expired: Jul 18, 2012, 1:15 PM EDT
In force: 40 min
Issued by: NWS Blacksburg, VA

County Grayson County, VA

The radar

The Roanoke radar (KFCX), 110 km from the middle of the area, began a volume at 16:38 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 12:00Z, 4.6 hours before the alert went out and 148 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: 1738 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 1050 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: -4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 18, 10:53 AM EDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jul 18, 10:53 AM EDT, 1 hour 42 minutes before

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Hazardous weather outlook, Jul 18, 9:22 AM EDT, 3 hours 13 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
922 AM EDT WED JUL 18 2012

VAZ047-191330-
BUCKINGHAM-
922 AM EDT WED JUL 18 2012

...HEAT ADVISORY IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   HEAT ADVISORY.

THERE IS ALSO A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
INTO THIS EVENING WITH THE MAIN THREAT BEING DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

BANDS OF SHOWERS AND THUNDERSTORMS AHEAD OF AN APPROACHING COLD
FRONT COULD BE ON THE STRONG SIDE THURSDAY AND AGAIN FRIDAY WITH
GUSTY WINDS AND HEAVY RAINFALL POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

VAZ022>024-034-035-045-046-191330-
ROANOKE-BOTETOURT-ROCKBRIDGE-BEDFORD-AMHERST-CAMPBELL-APPOMATTOX-
922 AM EDT WED JUL 18 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL VIRGINIA...SOUTH
CENTRAL VIRGINIA AND WEST CENTRAL VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON INTO
THIS EVENING. THE MAIN THREAT WILL BE DAMAGING WINDS.

HEAT INDICES WILL ALSO SURGE TO AROUND 100 TO 104 DEGREES IN A FEW
LOCATIONS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

BANDS OF SHOWERS AND THUNDERSTORMS AHEAD OF AN APPROACHING COLD
FRONT COULD BE ON THE STRONG SIDE THURSDAY AND AGAIN FRIDAY WITH
GUSTY WINDS AND HEAVY RAINFALL POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

VAZ007-009>014-018>020-WVZ042>045-191330-
TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-MONTGOMERY-CRAIG-
ALLEGHANY VA-BATH-MERCER-SUMMERS-MONROE-GREENBRIER-
922 AM EDT WED JUL 18 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWEST VIRGINIA...WEST
CENTRAL VIRGINIA AND SOUTHEAST WEST VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

THUNDERSTORMS WILL BE STRONG TO POSSIBLY SEVERE THIS AFTERNOON
INTO THIS EVENING. THE MAIN THREAT WILL BE DAMAGING WINDS AND
TORRENTIAL DOWNPOURS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

BANDS OF SHOWERS AND THUNDERSTORMS AHEAD OF AN APPROACHING COLD
FRONT COULD BE ON THE STRONG SIDE THURSDAY AND AGAIN FRIDAY WITH
GUSTY WINDS AND HEAVY RAINFALL POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NCZ005-006-VAZ043-044-058-059-191330-
ROCKINGHAM-CASWELL-HENRY-PITTSYLVANIA-HALIFAX-CHARLOTTE-
922 AM EDT WED JUL 18 2012

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

.DAY ONE...TODAY AND TONIGHT.

HEAT INDICES SHOULD TOP OUT IN THE 100 TO 104 DEGREE RANGE THIS AFTERNOON.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

BANDS OF SHOWERS AND THUNDERSTORMS AHEAD OF AN APPROACHING COLD
FRONT COULD BE ON THE STRONG SIDE THURSDAY AND AGAIN FRIDAY WITH
GUSTY WINDS AND HEAVY RAINFALL POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NCZ001>004-018>020-VAZ015>017-032-033-191330-
ASHE-ALLEGHANY NC-SURRY-STOKES-WATAUGA-WILKES-YADKIN-GRAYSON-CARROLL-
FLOYD-PATRICK-FRANKLIN-
922 AM EDT WED JUL 18 2012

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

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER LOW AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

BANDS OF SHOWERS AND THUNDERSTORMS AHEAD OF AN APPROACHING COLD
FRONT COULD BE ON THE STRONG SIDE THURSDAY AND AGAIN FRIDAY WITH
GUSTY WINDS AND HEAVY RAINFALL POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 18, 12:27 PM EDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
1227 PM EDT WED JUL 18 2012

VAZ015-181700-
GRAYSON VA-
1227 PM EDT WED JUL 18 2012

...A STRONG THUNDERSTORM WILL AFFECT GRAYSON COUNTY...

AT 1221 PM EDT...A STRONG THUNDERSTORM WAS LOCATED OVER INDEPENDENCE.
THIS STORM IS NEARLY STATIONARY.

WIND GUSTS TO 30 MPH ARE POSSIBLE WITH THIS STORM. VERY HEAVY RAIN
WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO POND ON ROADS AND
QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

LOCATIONS THAT WILL BE IMPACTED INCLUDE INDEPENDENCE AND RURAL AREAS
ALONG HIGHWAY 58 BETWEEN GALAX AND BRIDLE CREEK.

LAT...LON 3671 8101 3656 8096 3657 8121 3666 8123

WP

Special weather statement, Jul 18, 12:35 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
1235 PM EDT WED JUL 18 2012

VAZ015-181715-
GRAYSON VA-
1235 PM EDT WED JUL 18 2012

...A STRONG THUNDERSTORM WILL AFFECT WESTERN GRAYSON COUNTY...

AT 1229 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES NORTHWEST
OF MOUTH OF WILSON...MOVING NORTHEAST AT 5 MPH.

WIND GUSTS TO 30 MPH ARE POSSIBLE WITH THIS STORM. VERY HEAVY RAIN
WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO POND ON ROADS AND
QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

THIS STORM WILL STAY OVER MAINLY RURAL AREAS OF GRAYSON
COUNTY...ALONG HIGHWAY 58 BETWEEN GRAYSON HIGHLANDS STATE PARK AND
BRIDLE CREEK...AND ALONG TROUTDALE HIGHWAY AROUND VOLNEY.

LAT...LON 3663 8152 3673 8134 3658 8127 3657 8135
      3658 8143

WP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 12:27 PM EDT	Special Weather Statement	RNK	Grayson	33 min
Jul 18, 1:13 PM EDT	Special Weather Statement	RNK	Tazewell	62 min
Jul 18, 1:57 PM EDT	Special Weather Statement	RNK	Alleghany	48 min
Jul 18, 2:23 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Bath, City of Covington	62 min
Jul 18, 2:30 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Amherst, Bath, Botetourt, Rockbridge, City of Buena Vista and 1 more	75 min
Jul 18, 2:35 PM EDT	Special Weather Statement	RNK	Patrick	25 min
Jul 18, 2:56 PM EDT	Special Weather Statement	RNK	Buckingham	34 min
Jul 18, 3:05 PM EDT	Special Weather Statement	RNK	Bland	40 min
Jul 18, 3:18 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Botetourt, Craig	57 min
Jul 18, 3:23 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Giles, Pulaski, Wythe	28 min
Jul 18, 3:39 PM EDT	Severe Thunderstorm Warning	RNK	Patrick	17 min
Jul 18, 4:00 PM EDT	Special Weather Statement	RNK	Floyd	30 min
Jul 18, 4:08 PM EDT	Special Weather Statement	RNK	Franklin	37 min
Jul 18, 4:18 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Franklin, Patrick	44 min
Jul 18, 4:19 PM EDT	Special Weather Statement	RNK	Botetourt	26 min
Jul 18, 4:25 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt, Craig, Roanoke, City of Roanoke, City of Salem	54 min
Jul 18, 4:38 PM EDT	Severe Thunderstorm Warning	RNK	Buckingham	67 min
Jul 18, 4:43 PM EDT	Severe Thunderstorm Warning	RNK	Roanoke, City of Roanoke, City of Salem	49 min
Jul 18, 5:33 PM EDT	Flash Flood Warning	RNK	Buckingham	3 hr
Jul 18, 5:43 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Appomattox, Buckingham	62 min
Jul 18, 2:13 PM EDT	Special Weather Statement	RNK	Alleghany	62 min
Jul 18, 2:40 PM EDT	Areal Flood Advisory	RNK	Alleghany, Ashe, Wilkes	3 hr
Jul 18, 2:50 PM EDT	Areal Flood Advisory	RNK	Watauga, Wilkes	3 hr
Jul 18, 3:01 PM EDT	Areal Flood Warning	RNK	Alleghany, Ashe, Watauga, Wilkes	11 min
Jul 18, 3:11 PM EDT	Flash Flood Warning	RNK	Alleghany, Ashe, Watauga, Wilkes	3 hr
Jul 18, 3:41 PM EDT	Special Weather Statement	RNK	Greenbrier	34 min
Jul 18, 5:46 PM EDT	Special Weather Statement	RNK	Greenbrier	29 min
Jul 18, 6:55 PM EDT	Special Weather Statement	RNK	Greenbrier	35 min

Nearby

Special Weather Statements in Virginia, 2012 Every special weather statement 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.