Alert archive / Virginia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 313, NWS Blacksburg, VA

July 30, 2012Bath County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 30, 2012, 7:50 PM EDT for Bath County, Virginia. It was in force for 40 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 30, 2012, 7:50 PM EDT (23:50 UTC)
Expired: Jul 30, 2012, 8:30 PM EDT
In force: 40 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

County Bath County, VA

The radar

The Roanoke radar (KFCX), 142 km from the middle of the area, began a volume at 23:54 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.

What was reported inside it

Time	Report	Where	Remark
Jul 30, 7:58 PM EDT	HAIL 0.5	1 E Burnsville, VA	HAIL COVERED THE GROUND ON TOWER HILL ROAD.
Jul 30, 8:00 PM EDT	TSTM WND DMG	3 Ese Burnsville, VA	TREES DOWN ON INDIAN DRAFT ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 11.8 hours before the alert went out and 113 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: 392 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 826 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 35 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.

353 
WUUS51 KRNK 302350
SVRRNK
VAC017-310030-
/O.NEW.KRNK.SV.W.0313.120730T2350Z-120731T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
750 PM EDT MON JUL 30 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BATH COUNTY IN WEST CENTRAL VIRGINIA

* UNTIL 830 PM EDT.

* AT 745 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED
  NEAR BURNSVILLE...OR 11 MILES NORTHEAST OF WARM SPRINGS...AND
  MOVING NORTHWEST AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BURNSVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER.

REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...
DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY
HEAVY RAIN.

LARGE HAIL AND...OR STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM.
IN ADDITION...TORRENTIAL RAINS MAY FLOOD LOW LYING AREAS SUCH AS
DITCHES AND UNDERPASSES. DO NOT DRIVE INTO AREAS WHERE WATER COVERS
THE ROAD!

WHEN IT IS SAFE TO DO SO...PLEASE SEND YOUR REPORTS OF QUARTER OR
LARGER SIZED HAIL...AS WELL AS WIND DAMAGE...INCLUDING TREES OR LARGE
LIMBS DOWNED BY CALLING THE NATIONAL WEATHER SERVICE TOLL FREE AT...
1...8 6 6...2 1 5...4 3 2 4.

&&

LAT...LON 3822 7970 3821 7957 3819 7952 3816 7952
      3817 7948 3809 7957 3822 7987 3826 7982
      3827 7981 3827 7978
TIME...MOT...LOC 2350Z 130DEG 11KT 3817 7964

$$

PH

2 follow-up statements

071 
WWUS51 KRNK 310001
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
801 PM EDT MON JUL 30 2012

VAC017-310030-
/O.CON.KRNK.SV.W.0313.000000T0000Z-120731T0030Z/
BATH VA-
801 PM EDT MON JUL 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHEASTERN BATH COUNTY...

AT 758 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR BURNSVILLE...OR 13 MILES NORTHEAST OF WARM SPRINGS...
MOVING NORTH AT 10 MPH.

LOCATIONS IMPACTED INCLUDE...
  BURNSVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER.
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...
DAMAGING WINDS IN EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY
HEAVY RAIN.

TORRENTIAL RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND 
UNDERPASSES. TURN AROUND DONT DROWN!

TO REPORT SEVERE WEATHER...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN BLACKSBURG AT...1...8 6 6...2 1 5...4 3 2 4...WHEN YOU CAN
DO SO SAFELY. ONCE AGAIN THAT NUMBER IS 1...8 6 6...2 1 5...4 3 2 4.

&&

LAT...LON 3825 7976 3825 7975 3822 7970 3821 7957
      3819 7952 3810 7958 3816 7974 3819 7981
TIME...MOT...LOC 0001Z 187DEG 9KT 3819 7962

$$

PH

053 
WWUS51 KRNK 310026
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
826 PM EDT MON JUL 30 2012

VAC017-310036-
/O.EXP.KRNK.SV.W.0313.000000T0000Z-120731T0030Z/
BATH VA-
826 PM EDT MON JUL 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BATH COUNTY
EXPIRES AT 830 PM EDT...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW
SEVERE LIMITS. THUS THE WARNING WILL BE ALLOWED TO EXPIRE.

TO REPORT SEVERE WEATHER...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN BLACKSBURG AT...1...8 6 6...2 1 5...4 3 2 4. ONCE AGAIN
THAT NUMBER IS 1...8 6 6...2 1 5...4 3 2 4.

REPORT ANY SEVERE WEATHER OR STORM RELATED DAMAGE TO LOCAL LAW
ENFORCEMENT OFFICIALS AND ASK THEM TO IMMEDIATELY RELAY THE REPORT TO
THE NATIONAL WEATHER SERVICE OFFICE IN BLACKSBURG.

LAT...LON 3825 7976 3825 7975 3822 7970 3821 7957
      3819 7952 3810 7958 3816 7974 3819 7981
TIME...MOT...LOC 0026Z 187DEG 9KT 3825 7961

$$

PH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 1:13 PM EDT	Special Weather Statement	RNK	Appomattox, Charlotte	62 min
Jul 30, 2:06 PM EDT	Special Weather Statement	RNK	Appomattox	54 min
Jul 30, 2:25 PM EDT	Special Weather Statement	RNK	Carroll	65 min
Jul 30, 2:54 PM EDT	Special Weather Statement	RNK	Appomattox	66 min
Jul 30, 4:32 PM EDT	Special Weather Statement	RNK	Bedford	58 min
Jul 30, 4:58 PM EDT	Special Weather Statement	RNK	Franklin	47 min
Jul 30, 5:20 PM EDT	Special Weather Statement	RNK	Cumberland	40 min
Jul 30, 6:44 PM EDT	Special Weather Statement	RNK	Halifax	31 min
Jul 30, 7:19 PM EDT	Special Weather Statement	RNK	Halifax	41 min
Jul 30, 7:44 PM EDT	Special Weather Statement	RNK	Bath	31 min
Jul 30, 7:57 PM EDT	Special Weather Statement	RNK	Halifax	48 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2012 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.