Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Blacksburg, VA

June 18, 2012Roanoke County, City of Roanoke, City of Salem, Virginia

NWS Blacksburg, VA issued this special weather statement at Jun 18, 2012, 1:12 PM EDT for Roanoke County, City of Roanoke, City of Salem, Virginia. It was in force for 48 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: Jun 18, 2012, 1:12 PM EDT (17:12 UTC)
Expired: Jun 18, 2012, 2:00 PM EDT
In force: 48 min
Issued by: NWS Blacksburg, VA

Counties City of Roanoke, VA, City of Salem, VA, Roanoke County, VA

The radar

The Roanoke radar (KFCX), 36 km from the middle of the area, began a volume at 17:12 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, 5.2 hours before the alert went out and 48 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: 223 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 532 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 65 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 Jun 18, 11:36 AM EDT, 1 hour 36 minutes earlier.

Area forecast discussion, Jun 18, 11:36 AM EDT, 1 hour 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG VA
1136 AM EDT MON JUN 18 2012

.SYNOPSIS...
A WEAK UPPER LEVEL DISTURBANCE WILL PASS OVERHEAD TODAY
EXITING THE AREA TONIGHT. HIGH PRESSURE ALOFT WILL STRENGTHEN
OVER THE AREA BY MID WEEK...RESULTING IN A WARMING TREND AND
HUMID CONDITIONS FOR THE REMAINDER OF THE WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
AS OF 1130 AM EDT MONDAY...

SCATTERED SHOWERS IN THE EASTERN COUNTY WARNING AREA WILL
CONTINUE TO MOVE SOUTHEAST. SHOWERS AND THUNDERSTORMS IN SOUTHEAST
WEST VIRGINIA WILL MOVE SOUTHEAST AND WILL TRIGGER MORE STORMS
OVER THE MOUNTAINS THIS AFTERNOON.

RAISED MAXIMUM TEMPERATURES FOR SOME LOCATIONS WEST OF THE BLUE
RIDGE BASED ON CURRENT TRENDS IN OBSERVATIONS.

AS OF 430 AM EDT MONDAY...

A WEAK UPPER LEVEL DISTURBANCE WILL PASS OVERHEAD TODAY EXITING
THE AREA TONIGHT. THIS FEATURE WILL RESULT IN CONSIDERABLE
CLOUDINESS ALONG WITH SCATTERED SHOWERS AND STORMS OVER THE
REGION TODAY.

VORT AXIS IS ALONG THE ALLEGHANY FRONT THIS MORNING...AND IS
FORECAST TO SLOWLY MOVE EAST...EXITING THE CWA BY THIS EVENING.
MODEL POPS ARE HIGHEST THIS MORNING...THEN WANE THIS
AFTERNOON. ANY CLEARING HOWEVER MAY RESULT IN INCREASED
INSTABILITY...MODIFIED SOUNDING CAPES 1000 ISH...FUELING
ADDITIONAL SHRA/TSRA DURING THE AFTERNOON/EVENING. ANY INSTABILITY
DRIVEN ACTIVITY SHOULD DISSIPATE AFTER SUNSET.

TEMPS TODAY WILL AGAIN BE SIMILAR TO THE LAST FEW DAYS...READINGS
MAINLY IN THE 70S...BUT TESTING L80S FOR A FEW HOURS DURING THE
MID/LATE AFTERNOON. MOST NOTICABLE DIFFERENCE TODAY COMPARED TO
THE LAST FEW DAYS WILL BE THE MOISTURE CONTENT OF THE
AIRMASS...DEWPOINTS NOW INTO THE L60S...COMFORT FACTOR EDGING
DOWN. THESE HIGHER DEWPOINTS WILL ALSO SUPPORT HIGHER
TMINS...TONIGHTS LOWS AOA 60.

&&

.SHORT TERM /TUESDAY THROUGH THURSDAY/...
AS OF 430 AM EDT MONDAY...

AN UPPER LEVEL RIDGE WILL MOVE FROM THE OHIO VALLEY TUESDAY...THEN
OVER THE MID ATLANTIC REGION ON WEDNESDAY. BY THURSDAY...THIS RIDGE
WILL TRACK OFF THE MID ATLANTIC SHORE. WARM ABOVE AVERAGE
TEMPERATURES WILL BEGIN TUESDAY WITH READINGS IN THE MID 80S WEST TO
UPPER 80S EAST. A TAD WARMER WEDNESDAY WITH UPPER 80S WEST TO LOWER
90S EAST. SIMILAR TEMPERATURES EXPECTED THURSDAY BUT 1F-2F WARMER
THAN WEDNESDAY. A COMBINATION OF WARM TEMPERATURES...HIGH HUMIDITIES
AND WEAK WINDS WILL RESULT IN AIR QUALITY BEING POOR THIS WEEK.

MID AND UPPER LEVEL RIDGING SHOULD DETER LONG-LIVED STORMS TUESDAY
THROUGH THURSDAY. A FEW ISOLATED CELLS COULD DEVELOP DURING THE LATE
AFTERNOON...FADING IN THE EVENING WITH LOSE OF HEATING.

&&

.LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/...
AS OF 430 AM EDT MONDAY...

THE UPPER LEVEL RIDGE WILL CONTINUE ITS INFLUENCE ON THE AREAS
WEATHER FRIDAY. WARM TEMPERATURES IN THE UPPER 80S ACROSS THE
MOUNTAINS TO LOWER TO MID 90S EAST OF THE BLUE RIDGE. ONLY A FEW
ISOLATED SHOWERS AND THUNDERSTORMS EXPECTED ON FRIDAY. AS THE RIDGE
DRIFTS EAST AND OUT TO SEA...A COLD FRONT FROM THE OHIO VALLEY MAY
ENTER THE AREA OVER NEXT WEEKEND. THIS FRONT WILL INCREASE THE
CHANCES FOR SHOWERS IN THE REGION.

&&

.AVIATION /16Z MONDAY THROUGH FRIDAY/...
AS OF 430 AM EDT MONDAY...

SHRA/TSRA MAY RESULT IN OCNL MVFR CIGS/VSBYS TODAY. OTRW
EXPECTING MAINLY VFR CIGS OUTSIDE OF ANY SCT SHOWER
ACTIVITY WITH SCT-BKN CU AND BKN-OVC AC/CS.

VSBYS TODAY LOOK IN GOOD SHAPE...MAINLY P6SM. THE HIGHER DEWPOINT
AIRMASS THAT IS NOW BEGINNING TO ENVELOP THE REGION WILL LIKELY
RESULT IN SOME LIGHT FOG...MAINLY MVFR TONIGHT...WITH POSSIBLE IFR
CONDITIONS FOR A FEW HOURS DAYBREAK TUESDAY VCNTY OF LWB/BCB.

TUESDAY THROUGH FRIDAY...CONFIDENCE IS HIGH THAT VFR CONDITIONS
WILL PREVAIL ACROSS MOST OF THE REGION THANKS TO PERSISTENT HIGH
PRESSURE. THERE IS THE POTENTIAL FOR WIDELY SCATTERED
AFTERNOON/EVENING SHRA/TSRA...ESPCLY OVER THE MTNS...BUT LIMITED
COVERAGE SHOULD BE EASILY NAVIGABLE. A WEAK COLD FRONT DROPPING IN
FROM THE NW MAY BRING SLIGHTLY BETTER COVERAGE OF SHRA/TSRA BY THE
END OF THE WEEK.

LATE NIGHT VALLEY OR RIVER VALLEY FOG EPISODES ARE POSSIBLE AROUND
DAYBREAK EACH MORNING...BUT MAINLY IN THE MOUNTAINS. ANY FOG
FORMATION SHOULD BE LIMITED TO A FEW HOURS NEAR DAYBREAK...
DISSIPATING QUICKLY AFTER SUNRISE.

&&

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

&&

SYNOPSIS...PM
NEAR TERM...AMS/PM
SHORT TERM...RCS
LONG TERM...RCS
AVIATION...PM

Hazardous weather outlook, Jun 18, 4:50 AM EDT, 8 hours 22 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
450 AM EDT MON JUN 18 2012

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-190900-
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-
450 AM EDT MON JUN 18 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.

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

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jun 18, 1:12 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
112 PM EDT MON JUN 18 2012

VAZ014-018-022-023-033-034-181800-
BOTETOURT VA-FRANKLIN VA-CRAIG VA-BEDFORD VA-ROANOKE VA-MONTGOMERY
VA-
112 PM EDT MON JUN 18 2012

...THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A SPECIAL
WEATHER STATEMENT FOR
SOUTHWESTERN BOTETOURT...NORTHWESTERN FRANKLIN...
SOUTHEASTERN CRAIG...WEST CENTRAL BEDFORD...
ROANOKE AND NORTHEASTERN MONTGOMERY COUNTIES
UNTIL 200 PM EDT...

AT 108 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
TRACKING A LINE OF STRONG THUNDERSTORMS ...AND MOVING SOUTHEAST AT
25 MPH.

NICKEL SIZE HAIL AND WIND GUSTS UP TO 40 MPH IS EXPECTED WITH
THESE STORMS. VERY HEAVY RAIN IS FALLING...AND WILL CAUSE WATER TO
POND ON ROADWAYS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL
STREAMS. EXPECT FREQUENT CLOUD TO GROUND LIGHTNING. DO NOT STAY IN
THE OPEN OR SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS.
MOVE INSIDE A STURDY SHELTER.

LOCATIONS IMPACTED INCLUDE...
ROANOKE...SALEM CITY...BENT MOUNTAIN...TROUTVILLE...BOONES
MILL...AND CAVE SPRING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO
AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

&&

LAT...LON 3727 7958 3699 8001 3721 8019 3722 8018
      3729 8024 3731 8025 3738 8016 3738 8014
      3748 8000
TIME...MOT...LOC 1708Z 308DEG 22KT 3742 8002 3729 8021

16

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 1:36 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Franklin, Roanoke, City of Roanoke, City of Salem	39 min
Jun 18, 2:10 PM EDT	Special Weather Statement	RNK	Patrick	50 min
Jun 18, 2:30 PM EDT	Special Weather Statement	RNK	Franklin	45 min
Jun 18, 3:24 PM EDT	Special Weather Statement	RNK	City of Martinsville	51 min
Jun 18, 3:47 PM EDT	Special Weather Statement	RNK	Floyd	43 min
Jun 18, 3:58 PM EDT	Severe Thunderstorm Warning	RNK	Franklin, Pittsylvania	62 min
Jun 18, 4:40 PM EDT	Special Weather Statement	RNK	Patrick	50 min
Jun 18, 5:05 PM EDT	Special Weather Statement	RNK	City of Galax	40 min
Jun 18, 5:35 PM EDT	Special Weather Statement	RNK	City of Danville	40 min
Jun 18, 5:57 PM EDT	Special Weather Statement	RNK	Carroll	48 min
Jun 18, 6:59 PM EDT	Special Weather Statement	RNK	Carroll, Wythe, City of Galax	46 min
Jun 18, 6:12 PM EDT	Severe Thunderstorm Warning	RNK	Wilkes	63 min
Jun 18, 6:52 PM EDT	Areal Flood Warning	RNK	Wilkes	2 hr
Jun 17, 10:45 PM EDT	Special Weather Statement	RNK	Greenbrier	45 min
Jun 17, 11:30 PM EDT	Special Weather Statement	RNK	Greenbrier	45 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.