Alert archive / Virginia / Special Weather Statements in 2011
Special Weather Statement, NWS Blacksburg, VA
NWS Blacksburg, VA issued this special weather statement at Aug 20, 2011, 4:25 PM EDT for City of Galax, Virginia. It was in force for 50 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
- Aug 20, 2011, 4:25 PM EDT (20:25 UTC)
- Expired
- Aug 20, 2011, 5:15 PM EDT
- In force
- 50 min
- Issued by
- NWS Blacksburg, VA
County City of Galax, VA
The radar
The Roanoke radar (KFCX), 71 km from the middle of the area, began a volume at 20:26 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 12:00Z, 8.4 hours before the alert went out and 124 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.
- Mixed-layer CAPE
- 606 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 1004 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>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 Aug 20, 3:48 PM EDT, 37 minutes earlier.
Area forecast discussion, Aug 20, 3:48 PM EDT, 37 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BLACKSBURG VA 348 PM EDT SAT AUG 20 2011 .SYNOPSIS... WEAK HIGH PRESSURE WILL REMAIN OVER THE AREA TODAY...ALLOWING FOR ONLY ISOLATED SHOWERS AND STORMS MAINLY DURING THE AFTERNOON AND EVENING NEAR THE BLUE RIDGE. A STRONG COLD FRONT WILL MOVE THROUGH LATE SUNDAY WITH MORE WIDESPREAD SHOWERS AND THUNDERSTORMS EXPECTED. HIGH PRESSURE WILL BUILD INTO THE REGION BEHIND THE FRONT MONDAY AND TUESDAY...AND BRING A RETURN OF DRIER AND COOLER WEATHER. && .NEAR TERM /THROUGH SUNDAY/... AS OF 345 PM EDT SATURDAY... SHOWERS...AND ISOLATED THUNDERSTORMS...HAVE REMAINED CONFINED TO THE MOUNTAINS OF NORTH CAROLINA THIS AFTERNOON AS HIGH PRESSURE REMAINS IN CONTROL OF OUR REGION. WOULD NOT BE SURPRISED TO SEE A LITTLE ADDITIONAL SHOWER DEVELOPMENT FURTHER NORTH ALONG THE BLUE RIDGE THIS EVENING...BUT BELIEVE THIS IS A LONG SHOT AND ANYTHING WHICH DOES DEVELOP WILL BE SHORT LIVED. EXPECT THAT MOST OF THE CLOUDS ACROSS OUR AREA WILL DISSIPATE SHORTLY AFTER SUNSET THIS EVENING AS DAYTIME HEATING ENDS...LEAVING ONLY THIN HIGH CLOUDS WHICH ARE BUILDING IN FROM THE WEST. WINDS WILL BECOME MORE SOUTHERLY OVERNIGHT AS HIGH PRESSURE SLIDES TO THE EAST. THIS SOUTHERLY FLOW WILL INCREASE OUR FETCH OF WARM MOIST AIR OFF OF THE ATLANTIC...AND EXPECT OUR OVERNIGHT LOWS TO BE A FEW DEGREES WARMER THAN LAST NIGHT. ALSO...WITH LIGHT WINDS AND MOSTLY CLEAR SKIES EXPECTED...HAVE MORE PATCHY FOG IN THE FORECAST FOR THE PREDAWN HOURS OF SUNDAY...MAINLY IN THE RIVER VALLEYS AND NEAR LARGER BODIES OF WATER. RAIN CHANCES WILL INCREASE DURING THE EARLY AFTERNOON ON SUNDAY AS A COLD FRONT APPROACHES OUR REGION FROM THE SOUTHERN GREAT LAKES. SHOWER AND THUNDERSTORM ACTIVITY IS EXPECTED TO BEGIN ALONG AND WEST OF THE BLUE RIDGE...AND WILL START OFF MORE AS THE PULSE VARIETY. SHOWER AND THUNDERSTORM ACTIVITY WILL BEGIN TO SPREAD EAST OF THE BLUE RIDGE BY LATE AFTERNOON AND EARLY EVENING...AT WHICH POINT THIS ACTIVITY SHOULD FORM UP INTO MORE OF A BROKEN LINE OF STORMS. WITH STRONG SURFACE HEATING ON SUNDAY AFTERNOON AND AN UPPER LEVEL DISTURBANCE PASSING THROUGH TO OFFER SUPPORT...EXPECT THAT A FEW STORMS WILL BECOME STRONG TO SEVERE DURING THE AFTERNOON...WITH LARGE HAIL AND DAMAGING WINDS AS THE MAIN THREATS. THE COLD FRONT WILL EXIT OUR REGION EARLY MONDAY MORNING. && .SHORT TERM /SUNDAY NIGHT THROUGH TUESDAY/... AS OF 200 PM EDT SATURDAY... THE 850 MB FRONT COMES THROUGH THE FORECAST AREA SUNDAY NIGHT ALONG WITH THE TROF AXIS. MODELS ARE HOLDING ON TO DEEPER MOISTURE UNTIL AFTER 06Z/2AM MONDAY WHEN THE FINAL SHORT WAVE CROSSES EAST OF THE COUNTY WARNING AREA. AS 850 MB WINDS BECOME NORTHWEST ON MONDAY...MUCH DRIER AIR ADVECTS INTO THE REGION. WILL KEEP THE PROBABILITY OF PRECIPITATION IN THE FORECAST UNTIL THE SHORT WAVE GOES BY. BY TUESDAY SURFACE HIGH PRESSURE WILL BE CENTERED OVER THE FORECAST AREA. WENT WITH COOLER BIAS CORRECTED MAV GUIDANCE FOR LOWS MONDAY NIGHT. ALSO LOWERED SURFACE DEW POINTS WELL INTO THE 50S BEHIND THE FRONT FROM MONDAY AFTERNOON THROUGH WEDNESDAY MORNING FOR MUCH OF THE AREA ALONG AND WEST OF THE BLUE RIDGE. && .LONG TERM /TUESDAY NIGHT THROUGH FRIDAY/... AS OF 200 PM SATURDAY... 500 MB RIDGE OVER THE WESTERN ATLANTIC BUILDS WHILE A TROF AMPLIFIES OVER THE EASTERN UNITED STATES ON THURSDAY AND FRIDAY. AT THE SURFACE HIGH PRESSURE WILL COVER THE FORECAST AREA ON TUESDAY AND WEDNESDAY WITH TEMPERATURES STARTING BELOW NORMAL BUT AS THE HIGH GRADUALLY MOVES OFFSHORE WEDNESDAY WITH WEAK SOUTHWEST LOW LEVEL WINDS TEMPERATURES WILL BE CLOSER TO NORMAL THROUGH SATURDAY. THURSDAY AND FRIDAY A COLD FRONT WILL CROSS THROUGH THE REGION BUT HOW FAR EAST AND SOUTH THE BOUNDARY GETS INTO THE UPPER RIDGE ON FRIDAY AND SATURDAY IS QUESTIONABLE AT THIS TIME. SO BEST PROBABILITY OF PRECIPITATION AT THIS TIME LOOKS TO BE THURSDAY AND FRIDAY WITH THE FRONT. && .AVIATION /19Z SATURDAY THROUGH THURSDAY/... AS OF 200 PM EDT SATURDAY... LOW CLOUDS FROM EARLIER THIS MORNING HAVE LIFTED...AND ALL STATIONS ARE REPORTING VFR CONDITIONS ACROSS OUR REGION. RADAR INDICATES SHOWER ACTIVITY DEVELOPING MAINLY IN THE NORTH CAROLINA MOUNTAINS AND ALONG THE BLUE RIDGE IN SOUTHERN VIRGINIA. DID NOTICE A WEAK STABLE LAYER IN THE MID LEVELS OF THE ATMOSPHERE FROM THIS MORNINGS SOUNDING AT KGSO...AND EXPECT THAT THE STABLE LAYER IS HELPING TO LIMIT THE DEVELOPMENT OF THIS SHOWER ACTIVITY. THAT STATED...EXPECT THAT A FEW THUNDERSTORMS WILL DEVELOP BY LATE THIS AFTERNOON WITH ADDITIONAL HEATING. NOT MUCH ELSE IN THE ATMOSPHERE TO SUPPORT THIS ACTIVITY...AND EXPECT THAT IT WILL DIE DOWN QUICKLY AFTER SUNSET. AT ANY RATE...DO NOT EXPECT THIS ACTIVITY TO AFFECT ANY TAF SITES. CONCERNING THE POTENTIAL FOR FOG DURING THE OVERNIGHT HOURS... FORECAST SOUNDINGS INDICATE THAT DESPITE SOUTHERLY FLOW BRINGING ATLANTIC MOISTURE INTO OUR REGION...THE CLOUD COVER WILL REMAIN LIMITED DURING THE PREDAWN HOURS OF SUNDAY...AND EXPECT THAT WE WILL HAVE PATCHY FOG REDEVELOP ACROSS PORTIONS OF OUR REGION SIMILAR TO THIS MORNING. HAVE THEREFORE INTRODUCED VISIBILITIES AT OR BELOW 1SM IN FOG INTO THE TAFS FOR BCB AND LWB. FOR SUNDAY...A COLD FRONT WILL MOVE THROUGH THE AREA BY LATE IN THE DAY...RESULTING IN A BETTER COVERAGE OF SHOWERS/THUNDERSTORMS SUNDAY AFTERNOON INTO SUNDAY NIGHT. SOME QUESTION AS TO ANY SHOWERS POSSIBLY REACHING WESTERN AREAS DURING THE MORNING...WHICH COULD HAMPER ACTIVITY LATER IN THE DAY. EASTERN LOCATIONS MAY HAVE OVERALL BEST CHANCE OF MORE STORMS...AND SOME COULD BE STRONG WITH VERY GUSTY WINDS. BRIEF MVFR TO IFR CONDITIONS IN HEAVY RAIN POSSIBLE AS WELL...THROUGH EVENING. HIGH PRESSURE SHOULD THEN BUILD IN AGAIN IN EARLY NEXT WEEK... BRINGING A RETURN TO VFR ACROSS THE REGION MONDAY INTO WEDNESDAY WITH ONLY AN ISOLATED STORM THREAT BY MIDWEEK. && .RNK WATCHES/WARNINGS/ADVISORIES... VA...NONE. NC...NONE. WV...NONE. && SYNOPSIS...NF NEAR TERM...NF/SK SHORT TERM...AMS LONG TERM...AMS AVIATION...NF/SK
Hazardous weather outlook, Aug 20, 3:23 PM EDT, 1 hour 2 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BLACKSBURG VA 323 PM EDT SAT AUG 20 2011 NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059- WVZ042>045-211930- 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- 323 PM EDT SAT AUG 20 2011 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...THIS AFTERNOON AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. THE PASSAGE OF A STRONG COLD FRONT SUNDAY INTO SUNDAY EVENING WILL TRIGGER SCATTERED STRONG TO SEVERE STORMS. EXPECT THAT THE MAIN THREATS WITH THESE STORMS WILL BE LARGE HAIL AND DAMAGING WINDS. PERIODS OF LOCALLY HEAVY RAIN WILL ALSO BE POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. 16
In the hours before
Special weather statement, Aug 20, 3:33 PM EDT, 52 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
333 PM EDT SAT AUG 20 2011
NCZ001-002-VAZ015-202030-
ALLEGHANY NC-ASHE NC-GRAYSON VA-
333 PM EDT SAT AUG 20 2011
...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WITH HEAVY RAIN WILL
AFFECT ALLEGHANY...ASHE AND GRAYSON COUNTIES...
AT 326 PM EDT...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WITH
HEAVY RAIN WERE LOCATED NEAR 5 MILES SOUTHWEST OF MOUTH OF WILSON TO
SPARTA...MOVING SOUTHEAST AT 5 MPH.
WIND GUSTS TO 30 MPH ARE POSSIBLE WITH ANY THUNDERSTORM. VERY HEAVY
RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO POND ON
ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.
STORMS WILL BE NEAR MOUTH OF WILSON AROUND 355 PM...PINEY CREEK
AROUND 420 PM AND SCOTTVILLE AROUND 430 PM.
LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER
UPDATES OR POSSIBLE WARNINGS.
LAT...LON 3672 8144 3659 8086 3642 8114 3644 8116
3640 8119 3636 8127 3637 8133 3652 8162
KKSpecial weather statement, Aug 20, 4:25 PM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BLACKSBURG VA 425 PM EDT SAT AUG 20 2011 VAZ012-015-016-202115- CARROLL VA-GRAYSON VA-WYTHE VA- 425 PM EDT SAT AUG 20 2011 ...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WITH HEAVY RAIN WILL AFFECT CARROLL...GRAYSON AND WYTHE COUNTIES... AT 421 PM EDT...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WITH HEAVY RAIN WERE LOCATED FROM 6 MILES SOUTHEAST OF SPEEDWELL TO SPRING VALLEY...MOVING SOUTHEAST AT 5 MPH. WIND GUSTS TO 30 MPH ARE POSSIBLE WITH ANY THUNDERSTORM. VERY HEAVY RAIN WILL FALL FROM STORMS...AND WILL CAUSE WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER UPDATES OR POSSIBLE WARNINGS. LAT...LON 3684 8085 3658 8086 3666 8124 3684 8120 KK
The office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 3:33 PM EDT | Special Weather Statement | RNK | Grayson | 57 min |
| Aug 20, 5:17 PM EDT | Special Weather Statement | RNK | Wythe | 58 min |
| Aug 20, 5:26 PM EDT | Special Weather Statement | RNK | City of Galax | 64 min |
| Aug 20, 6:15 PM EDT | Special Weather Statement | RNK | Alleghany, Wilkes | 60 min |
| Aug 20, 6:52 PM EDT | Severe Thunderstorm Warning | RNK | Wilkes, Yadkin | 53 min |
| Aug 20, 6:56 PM EDT | Flash Flood Warning | RNK | Wilkes | 115 min |
| Aug 20, 7:57 PM EDT | Special Weather Statement | RNK | Caswell | 63 min |
Nearby
Special Weather Statements in Virginia, 2011Every special weather statement 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.