Alert archive / Virginia / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 60, NWS Blacksburg, VA

May 15, 2010Carroll County, Floyd County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at May 15, 2010, 8:16 PM EDT for Carroll County, Floyd County, Virginia. It was in force for 43 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: May 15, 2010, 8:16 PM EDT (00:16 UTC)
Expired: May 15, 2010, 8:59 PM EDT
In force: 43 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Carroll County, VA, Floyd County, VA

The radar

The Roanoke radar (KFCX), 32 km from the middle of the area, began a volume at 00:19 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, 0.3 hours before the alert went out and 102 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: 471 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1996 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 41 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 May 15, 7:47 PM EDT, 29 minutes earlier.

Area forecast discussion, May 15, 7:47 PM EDT, 29 minutes before

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Hazardous weather outlook, May 15, 9:14 AM EDT, 11 hours 2 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
914 AM EDT SAT MAY 15 2010

NCZ001>006-018>020-VAZ015>017-032-033-043-044-058-059-161315-
ASHE-ALLEGHANY NC-SURRY-STOKES-ROCKINGHAM-CASWELL-WATAUGA-WILKES-
YADKIN-GRAYSON-CARROLL-FLOYD-PATRICK-FRANKLIN-HENRY-PITTSYLVANIA-
HALIFAX-CHARLOTTE-
914 AM EDT SAT MAY 15 2010

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

.DAY ONE...TODAY AND TONIGHT.

THERE IS A SLIGHT RISK OS SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING. SCATTERED STRONG THUNDERSTORMS ARE EXPECTED TO DEVELOP
ALONG THE BLUE RIDGE LATER THIS AFTERNOON...AND TRACK SLOWLY
EASTWARD INTO THE FOOTHILLS AND PIEDMONT. A FEW OF STORMS MAY BE
SEVERE WITH LARGE HAIL AND DAMAGING WINDS. IN ADDITION...LOCALLY
VERY HEAVY RAINFALL COULD ALSO OCCUR WITH THESE SLOW MOVING
STORMS.

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

ACTIVE WEATHER IS EXPECTED MONDAY AND TUESDAY WITH A POTENTIAL FOR
HEAVY RAIN RESULTING FROM SCATTERED TO NUMEROUS THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

VAZ007-009>014-018>020-022>024-034-035-045>047-WVZ042>045-161315-
TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-MONTGOMERY-CRAIG-
ALLEGHANY VA-BATH-ROANOKE-BOTETOURT-ROCKBRIDGE-BEDFORD-AMHERST-
CAMPBELL-APPOMATTOX-BUCKINGHAM-MERCER-SUMMERS-MONROE-GREENBRIER-
914 AM EDT SAT MAY 15 2010

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

.DAY ONE...TODAY AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

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

ACTIVE WEATHER IS EXPECTED MONDAY AND TUESDAY WITH A POTENTIAL FOR
HEAVY RAIN RESULTING FROM SCATTERED TO NUMEROUS THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, May 15, 6:08 PM EDT, 2 hours 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
608 PM EDT SAT MAY 15 2010

NCZ001-018-152245-
ASHE NC-WATAUGA NC-
608 PM EDT SAT MAY 15 2010

...A STRONG THUNDERSTORM WILL AFFECT ASHE AND WATAUGA COUNTIES...

AT 604 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 3 MILES NORTHWEST
OF SUGAR GROVE...MOVING NORTHEAST AT 20 MPH.

THIS STORM HAS PRODUCED PEA-SIZED HAIL AND HEAVY RAINFALL MAY ALSO
BE EXPECTED.

THIS STORM WILL BE NEAR SILVERSTONE AROUND 615 PM...TROUT AROUND 630
PM AND ASHLAND AROUND 645 PM.

LAT...LON 3634 8177 3634 8173 3636 8174 3649 8167
      3631 8151 3618 8186 3618 8187 3629 8192

EXPERIMENTAL

PC

Special weather statement, May 15, 7:12 PM EDT, 1 hour 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
712 PM EDT SAT MAY 15 2010

NCZ001-002-VAZ009-012-015>017-032-033-043-160015-
ALLEGHANY NC-ASHE NC-CARROLL VA-FLOYD VA-FRANKLIN VA-GRAYSON VA-
HENRY VA-PATRICK VA-SMYTH VA-WYTHE VA-
712 PM EDT SAT MAY 15 2010

...STRONG THUNDERSTORMS WILL AFFECT ALLEGHANY...ASHE...CARROLL...
FLOYD...FRANKLIN...GRAYSON...HENRY...PATRICK...SMYTH AND WYTHE
COUNTIES...

AT 710 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 7 MILES
EAST OF WOOLWINE TO 5 MILES NORTHEAST OF ASHLAND...MOVING NORTHEAST
AT 15 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE 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.

THESE STORMS WILL BE NEAR PHILPOTT DAM AROUND 730 PM...OAK LEVEL
AROUND 745 PM...FERRUM AROUND 800 PM AND DUGSPUR AROUND 815 PM.

THE PUBLIC IS ENCOURAGED TO RELAY REPORTS OF STRONG WINDS...HAIL OR
FLOODING TO THE NATIONAL WEATHER SERVICE IN BLACKSBURG BY CALLING
1...8 6 6...2 1 5...4 3 2 4...WHEN YOU CAN DO SO SAFELY.

LAT...LON 3648 8171 3653 8171 3660 8168 3663 8161
      3669 8165 3674 8163 3689 8074 3688 8070
      3691 8068 3704 7984 3680 7984 3643 8173

AMS

Local storm report, May 15, 7:57 PM EDT, 19 minutes before

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Local storm report, May 15, 8:04 PM EDT, 12 minutes before

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Special weather statement, May 15, 8:09 PM EDT, 7 minutes before

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Local storm report, May 15, 8:12 PM EDT, 4 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
May 15, 8:09 PM EDT	Special Weather Statement	RNK	Smyth, Tazewell	66 min
May 15, 11:27 PM EDT	Special Weather Statement	RNK	Halifax	48 min
May 15, 11:31 PM EDT	Severe Thunderstorm Warning	RNK	Charlotte, Halifax	44 min
May 15, 11:35 PM EDT	Special Weather Statement	RNK	Pittsylvania	25 min
May 16, 12:14 AM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	31 min
May 16, 12:46 AM EDT	Special Weather Statement	RNK	City of Martinsville	29 min
May 16, 1:10 AM EDT	Special Weather Statement	RNK	Pittsylvania, City of Danville	50 min
May 16, 4:19 AM EDT	Flash Flood Watch	RNK	Alleghany, Amherst, Bath, Bedford, Bland, Botetourt and 21 more	48 hr
May 16, 1:45 PM EDT	Special Weather Statement	RNK	Grayson, Wythe	2 hr
May 16, 1:56 PM EDT	Flash Flood Warning	RNK	Grayson	6 hr
May 16, 2:33 PM EDT	Special Weather Statement	RNK	Bland	27 min
May 16, 2:37 PM EDT	Special Weather Statement	RNK	Pulaski	53 min
May 16, 3:04 PM EDT	Flash Flood Warning	RNK	Bland, Tazewell	6 hr
May 16, 3:11 PM EDT	Special Weather Statement	RNK	Pulaski, City of Radford	19 min
May 16, 3:36 PM EDT	Special Weather Statement	RNK	City of Galax	54 min
May 16, 3:38 PM EDT	Special Weather Statement	RNK	City of Radford	37 min
May 16, 3:41 PM EDT	Special Weather Statement	RNK	Tazewell	64 min
May 16, 4:05 PM EDT	Severe Thunderstorm Warning	RNK	Grayson	30 min
May 16, 4:13 PM EDT	Special Weather Statement	RNK	Smyth	32 min
May 16, 4:36 PM EDT	Special Weather Statement	RNK	Grayson	24 min
May 16, 4:57 PM EDT	Special Weather Statement	RNK	Tazewell	33 min
May 16, 5:02 PM EDT	Special Weather Statement	RNK	Grayson	28 min
May 16, 5:19 PM EDT	Flash Flood Warning	RNK	Smyth, Tazewell	6 hr
May 16, 6:18 PM EDT	Special Weather Statement	RNK	Carroll	27 min
May 16, 6:37 PM EDT	Special Weather Statement	RNK	City of Galax	23 min
May 16, 7:01 PM EDT	Special Weather Statement	RNK	Carroll	29 min
May 16, 7:36 PM EDT	Special Weather Statement	RNK	Floyd, City of Radford	24 min
May 16, 12:33 AM EDT	Special Weather Statement	RNK	Rockingham	27 min
May 16, 1:08 AM EDT	Special Weather Statement	RNK	Rockingham	52 min
May 16, 3:29 PM EDT	Flash Flood Warning	RNK	Alleghany, Ashe	6 hr
May 16, 4:20 PM EDT	Special Weather Statement	RNK	Yadkin	25 min
May 16, 4:28 PM EDT	Special Weather Statement	RNK	Ashe	32 min
May 16, 4:50 PM EDT	Special Weather Statement	RNK	Yadkin	25 min
May 16, 5:31 PM EDT	Special Weather Statement	RNK	Surry	29 min
May 16, 5:57 PM EDT	Special Weather Statement	RNK	Surry	33 min
May 16, 6:22 PM EDT	Special Weather Statement	RNK	Ashe, Watauga, Wilkes, Yadkin	53 min
May 16, 7:11 PM EDT	Special Weather Statement	RNK	Alleghany, Wilkes, Yadkin	49 min
May 16, 7:18 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Ashe, Surry, Wilkes, Yadkin	57 min
May 16, 4:24 PM EDT	Special Weather Statement	RNK	Monroe	36 min
May 16, 4:34 PM EDT	Special Weather Statement	RNK	Summers	26 min
May 16, 5:24 PM EDT	Special Weather Statement	RNK	Greenbrier	36 min
May 16, 5:55 PM EDT	Flash Flood Warning	RNK	Greenbrier, Summers	6 hr

Nearby

Severe Thunderstorm Warnings in Virginia, 2010 Every severe thunderstorm warning in 2010

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.