Alert archive / Virginia / Heat Advisories in 2011

Heat Advisory 5, NWS Blacksburg, VA

July 22, 201111 counties in Virginia; Caswell County, Rockingham County, Stokes County, North Carolina

NWS Blacksburg, VA issued this heat advisory at Jul 22, 2011, 3:52 PM EDT for 11 counties in Virginia; Caswell County, Rockingham County, Stokes County, North Carolina. It took effect at Jul 23, 2011, 12:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 22, 2011, 3:52 PM EDT (19:52 UTC)
In effect from: Jul 23, 2011, 12:00 PM EDT
Expired: Jul 23, 2011, 8:00 PM EDT
In force: 8 hr
Issued by: NWS Blacksburg, VA

Counties Caswell County, NC, Rockingham County, NC, Stokes County, NC, Amherst County, VA, Appomattox County, VA, Buckingham County, VA, Campbell County, VA, Charlotte County, VA, City of Danville, VA, City of Lynchburg, VA, City of Martinsville, VA, Halifax County, VA, Henry County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 87 km from the middle of the area, began a volume at 19:55 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, 7.9 hours before the alert went out and 35 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: 2953 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 648 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 22 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 heat advisory 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 heat advisory went out at Jul 22, 3:34 PM EDT, 18 minutes earlier.

Area forecast discussion, Jul 22, 3:34 PM EDT, 18 minutes before

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Hazardous weather outlook, Jul 22, 4:10 AM EDT, 11 hours 42 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
410 AM EDT FRI JUL 22 2011

VAZ046-047-059-230815-
APPOMATTOX-BUCKINGHAM-CHARLOTTE-
410 AM EDT FRI JUL 22 2011

...EXCESSIVE HEAT WARNING IN EFFECT FROM 10 AM THIS MORNING TO 8 PM
EDT THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL VIRGINIA AND SOUTH
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.

   EXCESSIVE HEAT WARNING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

HEAT INDICES WILL AGAIN APPROACH 110 DEGREES SATURDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NCZ003>006-019-020-VAZ019-022>024-032>035-043>045-058-230815-
SURRY-STOKES-ROCKINGHAM-CASWELL-WILKES-YADKIN-ALLEGHANY VA-ROANOKE-
BOTETOURT-ROCKBRIDGE-PATRICK-FRANKLIN-BEDFORD-AMHERST-HENRY-
PITTSYLVANIA-CAMPBELL-HALIFAX-
410 AM EDT FRI JUL 22 2011

...HEAT ADVISORY IN EFFECT FROM 10 AM THIS MORNING TO 8 PM EDT THIS
EVENING...

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

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

HEAT INDICES SHOULD CLIMB TO AROUND 105 SATURDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NCZ001-002-018-VAZ007-009>018-020-WVZ042>045-230815-
ASHE-ALLEGHANY NC-WATAUGA-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-
MONTGOMERY-GRAYSON-CARROLL-FLOYD-CRAIG-BATH-MERCER-SUMMERS-MONROE-
GREENBRIER-
410 AM EDT FRI JUL 22 2011

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

.DAY ONE...TODAY AND TONIGHT.

THE HEAT INDEX THIS AFTERNOON WILL SOAR INTO THE MID 90S IN THE
MOUNTAINS...AS AS HIGH AS 100 TO 104 IN THE VALLEYS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THE HEAT INDICES WILL AGAIN BE IN THE MID 90S TO 104 DEGRESS
SATURDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 22, 2:50 PM EDT, 1 hour 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
250 PM EDT FRI JUL 22 2011

NCZ001-221945-
ASHE NC-
250 PM EDT FRI JUL 22 2011

...A STRONG THUNDERSTORM WILL AFFECT ASHE COUNTY...

AT 248 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES SOUTHWEST
OF WHITETOP. THIS STORM IS NEARLY STATIONARY.

WIND GUSTS TO 40 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.

LAT...LON 3655 8170 3657 8170 3659 8168 3659 8157
      3658 8153 3646 8166 3647 8170 3654 8171

RCS

Special weather statement, Jul 22, 2:58 PM EDT, 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
258 PM EDT FRI JUL 22 2011

VAZ015-221945-
GRAYSON VA-
258 PM EDT FRI JUL 22 2011

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

AT 256 PM EDT...A STRONG THUNDERSTORM WAS LOCATED OVER GALAX CITY...
DRIFTING NORTH AT 5 MPH.

WIND GUSTS TO 40 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 BE NEAR FRIES AROUND 325 PM.

LAT...LON 3664 8104 3672 8098 3667 8093 3668 8094
      3665 8095 3664 8092 3663 8093 3663 8092
      3665 8091 3663 8090 3658 8095

RCS

Special weather statement, Jul 22, 3:00 PM EDT, 52 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
300 PM EDT FRI JUL 22 2011

VAZ013-221945-
PULASKI VA-
300 PM EDT FRI JUL 22 2011

...A STRONG THUNDERSTORM WILL AFFECT EASTERN PULASKI COUNTY...

AT 256 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES EAST OF
ALLISONIA...DRIFTING WEST AT 5 MPH.

WIND GUSTS TO 40 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 PULASKI COUNTY.

LAT...LON 3691 8068 3698 8072 3704 8056 3699 8054
      3697 8055 3694 8059 3694 8061 3692 8066

RCS

Local storm report, Jul 22, 3:08 PM EDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
308 PM EDT FRI JUL 22 2011

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

0135 PM     TSTM WND DMG     4 WSW BLAND             37.08N 81.18W
07/22/2011                   BLAND              VA   911 CALL CENTER

            TREE BLOWN DOWN ON SOUTH SCENIC HIGHWAY.

&&

CHENARD

Special weather statement, Jul 22, 3:15 PM EDT, 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
315 PM EDT FRI JUL 22 2011

VAZ015-222000-
GRAYSON VA-
315 PM EDT FRI JUL 22 2011

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

AT 313 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTH OF
INDEPENDENCE...MOVING NORTHWEST AT 10 MPH.

WIND GUSTS TO 40 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 BE NEAR ELK CREEK AROUND 330 PM AND COMERS ROCK
AROUND 400 PM.

LAT...LON 3675 8129 3676 8118 3677 8115 3676 8114
      3677 8112 3666 8104 3663 8119

RCS

Special weather statement, Jul 22, 3:45 PM EDT, 7 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
Jul 22, 12:26 PM EDT	Special Weather Statement	RNK	Smyth	49 min
Jul 22, 1:05 PM EDT	Special Weather Statement	RNK	Patrick	40 min
Jul 22, 1:14 PM EDT	Special Weather Statement	RNK	Bland	46 min
Jul 22, 1:20 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Tazewell, Wythe	40 min
Jul 22, 1:55 PM EDT	Special Weather Statement	RNK	Tazewell	35 min
Jul 22, 2:58 PM EDT	Special Weather Statement	RNK	City of Galax	47 min
Jul 22, 3:00 PM EDT	Special Weather Statement	RNK	Pulaski	45 min
Jul 22, 3:15 PM EDT	Special Weather Statement	RNK	Grayson	45 min
Jul 22, 3:18 PM EDT	Severe Thunderstorm Warning	RNK	Pulaski, City of Radford	57 min
Jul 22, 3:36 PM EDT	Flash Flood Warning	RNK	Smyth, Tazewell	5 hr
Jul 22, 5:23 PM EDT	Special Weather Statement	RNK	Campbell	37 min
Jul 22, 5:27 PM EDT	Special Weather Statement	RNK	Patrick	33 min
Jul 22, 7:02 PM EDT	Special Weather Statement	RNK	Bedford	43 min
Jul 22, 7:21 PM EDT	Special Weather Statement	RNK	Pittsylvania	39 min
Jul 22, 7:38 PM EDT	Special Weather Statement	RNK	Bath	37 min
Jul 22, 1:44 PM EDT	Special Weather Statement	RNK	Ashe	46 min
Jul 22, 2:11 PM EDT	Special Weather Statement	RNK	Wilkes	64 min
Jul 22, 2:20 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Ashe	41 min
Jul 22, 2:50 PM EDT	Special Weather Statement	RNK	Ashe	55 min
Jul 22, 3:45 PM EDT	Special Weather Statement	RNK	Ashe	45 min
Jul 22, 4:39 PM EDT	Special Weather Statement	RNK	Surry	66 min
Jul 22, 4:50 PM EDT	Special Weather Statement	RNK	Summers	55 min
Jul 22, 7:47 PM EDT	Special Weather Statement	RNK	Greenbrier	43 min

Nearby

Heat Advisories in Virginia, 2011 Heat Advisories in North Carolina, 2011 Every heat advisory in 2011

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.