Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Blacksburg, VA

July 2, 2012Appomattox County, Virginia

NWS Blacksburg, VA issued this special weather statement at Jul 2, 2012, 6:36 PM EDT for Appomattox County, Virginia. It was in force for 9 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 2, 2012, 6:36 PM EDT (22:36 UTC)
Expired: Jul 2, 2012, 6:45 PM EDT
In force: 9 min
Issued by: NWS Blacksburg, VA

County Appomattox County, VA

The radar

The Norfolk radar (KAKQ), 148 km from the middle of the area, began a volume at 22:39 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, 10.6 hours before the alert went out and 81 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: 3 J/kg
Mixed-layer CIN: -375 J/kg
Mixed-layer LCL: 1514 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 158 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 2, 3:07 PM EDT, 3 hours 29 minutes earlier.

Area forecast discussion, Jul 2, 3:07 PM EDT, 3 hours 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG VA
307 PM EDT MON JUL 2 2012

.SYNOPSIS...
A LARGE UPPER LEVEL RIDGE WILL REMAIN IN CONTROL OVER THE
SOUTHEASTERN UNITED STATES THIS WEEK...WHICH WILL CONTINUE THE
TREND OF ABOVE NORMAL TEMPERATURES. SMALL DISTURBANCES WILL MOVE
ALONG THE PERIPHERY OF THIS RIDGE...AND WILL PROVIDE SCATTERED
SHOWERS AND THUNDERSTORMS DURING THIS TIME.

&&

.NEAR TERM /THROUGH TUESDAY/...
AS OF 305 PM EDT MONDAY...

THIS MORNING SHOWERS AND THUNDERSTORMS HELP STABILIZED THE
ATMOSPHERE. HOWEVER...PLENTY OF SUNSHINE WILL ALLOW SUFFICIENT
HEATING TO WARRANT A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS
THIS AFTERNOON. CU FIELD DEVELOPMENT ALONG THE NORTHERN BLUE RIDGE
SUPPORTS SOME POTENTIAL ACROSS THE HIGHER TERRAIN THIS AFTERNOON
INTO THIS EVENING AS HINTED AT IN THE RUC.

WITH NW FLOW ALOFT STRENGTHENING SLIGHTLY ACROSS THE REGION AS THE
UPPER HIGH WEAKENS SLIGHTLY AND SHIFTS FURTHER SOUTH...WOULD EXPECT
DISTURBANCES TO MOVE ACROSS OUR REGION.

WITH THE SUPPORT OF THE GFS KEPT THE HIGHER POPS AFTER 00Z WITH THE
POTENTIAL FOR ANOTHER MCS OR WARM FRONTAL TYPE CONVECTIVE EVENT.
THE MID LEVEL LAPSE RATE AROUND MINUS 7 TO OUR WEST FROM INDIANA
SOUTH TO TENNESSEE HIGHLIGHTS THE POTENTIAL FOR STORMS TO DEVELOP
TO OUR NORTHWEST AND DROP SOUTH INTO PORTIONS OF CWA TONIGHT.
PLAYED LOW TEMPERATURES CLOSE TO THE ADJMET WITH READINGS FROM THE
LOWER 60S IN THE MOUNTAINS TO THE LOWER 70S IN THE SOUTHEAST.

A TROUGH SETTING UP ALONG THE EASTERN FACE OF THE
APPALACHIANS...WILL SERVE AS THE FOCUS FOR SCATTERED SHOWERS AND
THUNDERSTORMS. PLACED THE HIGHEST POPS ACROSS THE WEST ON TUESDAY.
HIGH TEMPERATURES WILL RANGE FROM THE UPPER 80S ACROSS THE WESTERN
MOUNTAINS TO THE UPPER 90S IN THE PIEDMONTS. HEAT INDEX REMAIN BELOW
HEAT ADVISORY CRITERIA IN THE SOUTHEAST.

&&

.SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY/...
AS OF 305 PM EDT MONDAY...

ACTIVE WEATHER PATTERN CONTINUES WEDNESDAY SCATTERED SHOWERS AND
THUNDERSTORMS. THE BEST COVERAGE AND INTENSITY WILL OCCUR IN THE
AFTERNOON...AND CONTINUE INTO THE LATE EVENING HOURS. HIGH
TEMPERATURES WEDNESDAY WILL BE A FEW DEGREES COOLER THAN TUESDAY
WITH READINGS FROM THE MID 80S IN THE MOUNTAINS TO THE UPPER 90S IN
THE SOUTHEAST. PLAYED LOWS WEDNESDAY NIGHT FROM MID 60S IN THE WEST
TO AROUND 70 IN THE EAST.

ON THURSDAY...EXPECT ANOTHER WEAK COLD FRONT WILL SINK SOUTH
INTO THE MID ATLANTIC...BRINGING AN INCREASED CHANCE FOR SHOWERS AND
THUNDERSTORMS. UPPER LEVEL WINDS BECOME MORE NORTHERLY AND MID RANGE
FORECAST MODELS ARE HINTING AT A SUBTLE DISTURBANCE EMBEDDED IN THE
FLOW. HIGH LOWER A FEW DEGREES ON THURSDAY WITH VALUES FROM
THE LOWER 80S IN THE MOUNTAINS TO THE MID 90S IN THE SOUTHEAST.

&&

.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
AS OF 130 PM EDT MONDAY...

A LARGE UPPER LEVEL RIDGE WILL REMAIN CENTERED OVER THE GREAT
PLAINS. TEMPERATURES WILL CONTINUE TO BE ABOVE NORMAL THROUGH
SATURDAY...WITH HIGHS IN THE MID 80S TO MID 90S...AND LOWS IN THE
MID 60S TO MID 70S. SEVERAL DISTURBANCES WILL PROPAGATE AROUND THE
PERIPHERY OF THE UPPER LEVEL RIDGE...AND EACH ONE WILL SPARK A
CHANCE OF SHOWERS AND THUNDERSTORMS. IF ANY OF THESE DISTURBANCES
CAN DEVELOP ORGANIZED CONVECTION...THERE COULD BE MORE POTENTIAL FOR
SEVERE WEATHER WITH DAMAGING WINDS AND HAIL BEING THE MAIN THREATS.
PLENTY OF INSTABILITY WILL BE AVAILABLE...BUT IT WILL GREATLY DEPEND
ON CONDITIONS UPSTREAM OVER OHIO AND INDIANA.

BY SUNDAY...THE UPPER LEVEL RIDGE WILL SHIFT WESTWARD...AS A TROUGH
DEEPENS OVER THE NORTHEAST UNITED STATES. THE ECMWF AND GFS MODELS
AGREE ON A MORE POTENT FRONTAL BOUNDARY CROSSING OVER THE MID
ATLANTIC THAT EVENING...SO POPS WERE BUMPED UPWARD FROM THE PREVIOUS
FORECAST. THE FRONTAL BOUNDARY WILL LOSE MOMENTUM TRYING TO CROSS
THE CAROLINAS...AND IT MAY LIKELY STALL OUT BY MONDAY. CHANCES OF
SHOWERS AND THUNDERSTORMS WERE EXTENDED THROUGH EARLY NEXT
WEEK...AND TEMPERATURES WERE ADJUSTED SLIGHTLY DOWNWARD TO ACCOUNT
FOR CONVECTIVE DEBRIS CLOUD COVER AND THE FRONTAL PASSAGE.

&&

.AVIATION /19Z MONDAY THROUGH SATURDAY/...
AS OF 1230 PM EDT MONDAY...

MAIN CONCERN FOR THE TAFS THROUGH VALID PERIOD WILL ONCE AGAIN BE
CONVECTION...CHANCES...AND TIMING. ANY WEAK UPPER DISTURBANCE IN
THE NORTHWEST FLOW WILL TRANSLATE TO ANOTHER ROUND OF THUNDERSTORMS.

IN THE WAKE OF THIS MORNING CONVECTION...THE THREAT OF A LATE
DAY/EVENING MCS APPEARS LESS SIGNIFICANT TODAY THAN SUNDAY AS UPPER
SUPPORT HAS SHIFTED TO THE EAST AND WE MAY HAVE TO WAIT FOR THE NEXT
ONE OF THAT MAGNITUDE TO ARRIVE LATER TUE.

THE WRFARW-RNK CONTINUE TO SUPPORT A CALMER AFTERNOON. HOWEVER
THE RUC IS SHOWING SOME CONVECTION DEVELOPING ALONG EASTERN SLOPE OF
BLUE RIDGE THIS AFTERNOON. IN GENERAL...MODELS INDICATE CONVECTION
DRIFTING NE FROM NE TN/NW NC AFT 00Z. KEPT MENTION OF THIS IN
TAFS TONIGHT. OTHERWISE...VFR EXPECTED THROUGH TAF VALID PERIOD.

WINDS OVER CHAOTIC AND LIGHT OUTSIDE TSRA ACTIVITY. FAVORED
DIRECTION/SPEED ONCE AGAIN NW 5-10KTS. CANNOT RULE OUT LOW END GUSTS
ACROSS AREAS ALONG-EAST OF THE BLUE RIDGE THIS AFTERNOON INTO
TONIGHT.

EXPECT MAINLY VFR CONDITIONS THROUGH FRIDAY... THOUGH WILL LIKELY
SEE MORE AREAS OF MVFR/IFR VISIBILITY DUE TO FOG EARLY EACH
MORNING FROM TUESDAY ONWARD...ESPECIALLY AT KLWB AND KBLF.
ALSO...EXPECT TO SEE AN UPTICK IN AFTERNOON CONVECTION AND
ASSOCIATED SUB-VFR CONDITIONS AS THE UPPER LEVEL HIGH PRESSURE
SYSTEM GRADUALLY WEAKENS AND DRIFTS WESTWARD TOWARD THE LOWER-MID
MS VALLEY. TERRAIN- INDUCED AFTERNOON CONVECTION CURRENTLY
ANTICIPATED INTO FRIDAY.

&&

.RNK WATCHES/WARNINGS/ADVISORIES...
VA...NONE.
NC...NONE.
WV...NONE.

&&

SYNOPSIS...PW
NEAR TERM...KK
SHORT TERM...KK
LONG TERM...PW
AVIATION...KK/RAB

Hazardous weather outlook, Jul 2, 6:04 AM EDT, 12 hours 32 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
604 AM EDT MON JUL 2 2012

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-031000-
ASHE-ALLEGHANY NC-SURRY-STOKES-ROCKINGHAM-CASWELL-WATAUGA-WILKES-
YADKIN-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-MONTGOMERY-GRAYSON-
CARROLL-FLOYD-CRAIG-ALLEGHANY VA-BATH-ROANOKE-BOTETOURT-ROCKBRIDGE-
PATRICK-FRANKLIN-BEDFORD-AMHERST-HENRY-PITTSYLVANIA-CAMPBELL-
APPOMATTOX-BUCKINGHAM-HALIFAX-CHARLOTTE-MERCER-SUMMERS-MONROE-
GREENBRIER-
604 AM EDT MON JUL 2 2012

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.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.
ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS
AFTERNOON AND TONIGHT...A FEW OF WHICH MAY BECOME SEVERE
PRODUCING DAMAGING WINDS GUSTS ALONG WITH FREQUENT CLOUD-TO-GROUND LIGHTNING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

SCATTERED THUNDERSTORMS ARE EXPECTED EACH DAY THROUGH THE
PERIOD...MAINLY DURING THE AFTERNOON AND NIGHTTIME HOURS. AT THIS
TIME...THE MOST SIGNIFICANT THREAT FOR SEVERE THUNDERSTORMS WITH
DAMAGING WIND WOULD BE LATE TUESDAY INTO EARLY WEDNESDAY...AND
SATURDAY INTO SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

RAB

In the hours before

Local storm report, Jul 2, 3:42 PM EDT, 2 hours 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
342 PM EDT MON JUL 02 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1130 PM     TSTM WND DMG     5 SSW MATOAKA           37.34N 81.27W
07/01/2012                   MERCER             WV   911 CALL CENTER

            SEVERAL REPORTS OF TREES AND POWER LINES DOWN IN THE
            MONTCALM AND BLUEWELL AREAS.

1133 PM     TSTM WND DMG     BLUEFIELD               37.27N 81.22W
07/01/2012                   MERCER             WV   911 CALL CENTER

            MULTIPLE TREES AND POWER LINES DOWN IN THE BLUEFIELD AREA

&&

SK

Local storm report, Jul 2, 3:52 PM EDT, 2 hours 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
352 PM EDT MON JUL 02 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0905 PM     TSTM WND DMG     2 S BEDFORD CITY        37.31N 79.52W
06/29/2012                   BEDFORD            VA   EMERGENCY MNGR

            IN BEDFORD COUNTY...HUNDREDS OF TREES WERE BLOWN DOWN.
            POWER LINES WERE ALSO KNOCKED DOWN. SOME TREES WERE BLOWN
            DOWN ON HOMES. THE STRONGEST WINDS EXITED THE COUNTY
            AROUND 935 PM.

&&

HYSELL

Local storm report, Jul 2, 4:06 PM EDT, 2 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
406 PM EDT MON JUL 02 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0915 PM     TSTM WND DMG     BOONES MILL             37.12N 79.95W
06/30/2012                   FRANKLIN           VA   EMERGENCY MNGR

            APPOX 200 REPORTS OF DOWNED TREES AND POWERLINES
            COUNTYWIDE BETWEEN 915 PM AND 1000 PM. 1 MOBILE HOME WITH
            HEAVY DAMAGE...TREE CUT HOME IN HALF. SEVERAL OTHER HOMES
            WITH MINOR TO MODERATE DAMAGE ACROSS THE NORTHERN PART OF
            THE COUNTY FROM BOONES MILL TO BURNT CHIMNEY AND SMITH
            MOUNTAIN LAKE AREAS...DAMAGE ESTIMATES UNKNOWN AT THIS
            TIME.

&&

11

Special weather statement, Jul 2, 5:53 PM EDT, 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
553 PM EDT MON JUL 2 2012

VAZ047-022215-
BUCKINGHAM VA-
553 PM EDT MON JUL 2 2012

...A STRONG THUNDERSTORM WILL AFFECT BUCKINGHAM COUNTY...

AT 550 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 8 MILES SOUTH OF
DILLWYN...MOVING SOUTH AT 20 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THIS
STORM.

THIS STORM WILL BE NEAR SHEPPARDS AROUND 600 PM.

LAT...LON 3741 7841 3738 7843 3734 7846 3733 7847
      3733 7850 3746 7854 3750 7845 3742 7840

DS

Special weather statement, Jul 2, 6:11 PM EDT, 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
611 PM EDT MON JUL 2 2012

VAZ046-047-022245-
APPOMATTOX VA-BUCKINGHAM VA-
611 PM EDT MON JUL 2 2012

...A STRONG THUNDERSTORM WILL AFFECT APPOMATTOX AND BUCKINGHAM
COUNTIES...

AT 607 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTH OF
BENT CREEK...MOVING SOUTHEAST AT 20 MPH.

WIND GUSTS TO 40 MPH AND PEA-SIZED HAIL ARE POSSIBLE WITH THIS STORM.

THIS STORM WILL BE NEAR BENT CREEK AROUND 620 PM AND TOWER HILL
AROUND 630 PM.

LAT...LON 3741 7885 3754 7888 3755 7887 3754 7883
      3757 7882 3758 7884 3760 7884 3761 7882
      3762 7882 3747 7865

DS

Special weather statement, Jul 2, 6:36 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
636 PM EDT MON JUL 2 2012

VAZ046-047-022245-
APPOMATTOX VA-BUCKINGHAM VA-
636 PM EDT MON JUL 2 2012

...A STRONG THUNDERSTORM WILL AFFECT APPOMATTOX AND BUCKINGHAM
COUNTIES...

AT 632 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 12 MILES EAST OF
APPOMATTOX...MOVING SOUTH AT 20 MPH.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.

LAT...LON 3737 7859 3734 7859 3732 7862 3732 7863
      3740 7864 3740 7860 3738 7859

DS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 10:43 PM EDT	Special Weather Statement	RNK	Tazewell	62 min
Jul 1, 10:53 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Tazewell	67 min
Jul 1, 11:03 PM EDT	Special Weather Statement	RNK	Bath	27 min
Jul 1, 11:20 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Carroll, Grayson, Pulaski, Smyth, Tazewell and 1 more	55 min
Jul 1, 11:33 PM EDT	Severe Thunderstorm Warning	RNK	Grayson, Smyth	57 min
Jul 1, 11:44 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Giles, Montgomery, Pulaski, City of Radford	61 min
Jul 1, 11:57 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Floyd, Grayson, Patrick, Pulaski, Wythe and 1 more	63 min
Jul 2, 12:00 AM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	30 min
Jul 2, 12:24 AM EDT	Severe Thunderstorm Warning	RNK	Floyd, Franklin, Henry, Montgomery, Patrick, Pittsylvania and 2 more	66 min
Jul 2, 12:58 AM EDT	Special Weather Statement	RNK	City of Roanoke, City of Salem	32 min
Jul 2, 12:58 AM EDT	Severe Thunderstorm Warning	RNK	Patrick	62 min
Jul 2, 1:12 AM EDT	Severe Thunderstorm Warning	RNK	Franklin, Halifax, Henry, Patrick, Pittsylvania, City of Danville and 1 more	93 min
Jul 2, 5:53 PM EDT	Special Weather Statement	RNK	Buckingham	22 min
Jul 2, 6:11 PM EDT	Special Weather Statement	RNK	Appomattox	34 min
Jul 2, 6:43 PM EDT	Severe Thunderstorm Warning	RNK	Appomattox	62 min
Jul 2, 7:04 PM EDT	Special Weather Statement	RNK	Charlotte	26 min
Jul 2, 12:33 AM EDT	Severe Thunderstorm Warning	RNK	Ashe, Watauga, Wilkes	57 min
Jul 1, 10:38 PM EDT	Severe Thunderstorm Warning	RNK	Greenbrier	52 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.