Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Blacksburg, VA

April 21, 2012Floyd County, Virginia

NWS Blacksburg, VA issued this special weather statement at Apr 21, 2012, 4:33 PM EDT for Floyd County, Virginia. It was in force for 57 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: Apr 21, 2012, 4:33 PM EDT (20:33 UTC)
Expired: Apr 21, 2012, 5:30 PM EDT
In force: 57 min
Issued by: NWS Blacksburg, VA

County Floyd County, VA

The radar

The Roanoke radar (KFCX), 15 km from the middle of the area, began a volume at 20:35 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, 8.6 hours before the alert went out and 86 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: 62 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 773 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 59 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 Apr 21, 4:01 PM EDT, 32 minutes earlier.

Area forecast discussion, Apr 21, 4:01 PM EDT, 32 minutes before

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Hazardous weather outlook, Apr 21, 4:12 PM EDT, 21 minutes before

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In the hours before

Special weather statement, Apr 21, 3:18 PM EDT, 1 hour 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
318 PM EDT SAT APR 21 2012

VAZ013-014-016-017-212015-
CARROLL VA-FLOYD VA-MONTGOMERY VA-PULASKI VA-
318 PM EDT SAT APR 21 2012

...A STRONG THUNDERSTORM WILL AFFECT CARROLL...FLOYD...MONTGOMERY AND
PULASKI COUNTIES...

AT 314 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTH OF
HILLSVILLE...MOVING NORTHEAST AT 25 MPH.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
EXPECT FREQUENT CLOUD TO GROUND LIGHTNING FROM THIS STORM. DO NOT
STAY IN THE OPEN OR SEEK SHELTER UNDER TREES WHEN LIGHTNING
THREATENS...MOVE INDOORS WHEN A THUNDERSTORM APPROACHES.

THIS STORM WILL BE NEAR INDIAN VALLEY AROUND 340 PM...COPPER VALLEY
AROUND 345 PM...ALUM RIDGE AROUND 350 PM...PILOT AROUND 410 PM AND
TERRYS FORK AROUND 415 PM.

LAT...LON 3678 8071 3687 8075 3688 8075 3691 8077
      3719 8022 3713 8018 3711 8018 3711 8016
      3702 8011

RCS

Special weather statement, Apr 21, 3:21 PM EDT, 1 hour 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
321 PM EDT SAT APR 21 2012

NCZ003-019-212015-
SURRY NC-WILKES NC-
321 PM EDT SAT APR 21 2012

...A STRONG THUNDERSTORM WILL AFFECT SURRY AND WILKES COUNTIES...

AT 319 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTHEAST
OF NORTH WILKESBORO...MOVING NORTHEAST AT 20 MPH.

WIND GUSTS TO 40 MPH AND PEA-SIZED HAIL ARE POSSIBLE WITH THIS STORM.
EXPECT FREQUENT CLOUD TO GROUND LIGHTNING FROM THIS STORM. DO NOT
STAY IN THE OPEN OR SEEK SHELTER UNDER TREES WHEN LIGHTNING
THREATENS...MOVE INDOORS WHEN A THUNDERSTORM APPROACHES.

THIS STORM WILL BE NEAR ROARING RIVER AROUND 330 PM...RONDA AROUND
340 PM...BENHAM AROUND 355 PM...ELKIN AROUND 400 PM...STATE ROAD
AROUND 405 PM AND MOUNTAIN PARK AROUND 415 PM.

LAT...LON 3625 8118 3638 8099 3637 8098 3639 8098
      3655 8075 3632 8058 3626 8076 3628 8077
      3626 8078 3624 8087 3623 8088 3616 8110

RCS

Special weather statement, Apr 21, 3:44 PM EDT, 49 minutes before

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Special weather statement, Apr 21, 3:45 PM EDT, 48 minutes before

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Special weather statement, Apr 21, 4:12 PM EDT, 21 minutes before

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Special weather statement, Apr 21, 4:33 PM EDT, 0 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
Apr 21, 1:49 PM EDT	Special Weather Statement	RNK	Floyd	41 min
Apr 21, 3:18 PM EDT	Special Weather Statement	RNK	Floyd	57 min
Apr 21, 3:44 PM EDT	Special Weather Statement	RNK	Montgomery	46 min
Apr 21, 3:45 PM EDT	Special Weather Statement	RNK	Wythe	45 min
Apr 21, 4:12 PM EDT	Special Weather Statement	RNK	Grayson	33 min
Apr 21, 7:35 PM EDT	Special Weather Statement	RNK	Charlotte, Halifax	55 min
Apr 21, 3:21 PM EDT	Special Weather Statement	RNK	Surry	54 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.