Alert archive / Virginia / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 54, NWS Blacksburg, VA

May 23, 2004Floyd County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at May 23, 2004, 3:27 PM EDT for Floyd County, Virginia. It was in force for 63 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: May 23, 2004, 3:27 PM EDT (19:27 UTC)
Expired: May 23, 2004, 4:30 PM EDT
In force: 63 min
Issued by: NWS Blacksburg, VA
Area: Counties, with a storm outline in the text

County Floyd County, VA

The radar

The Roanoke radar (KFCX), 18 km from the middle of the area, began a volume at 19:28 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 7.5 hours before the alert went out and 86 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: 295 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1011 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 4 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.

385 
WUUS51 KRNK 231927
SVRRNK
VAC063-232030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
326 PM EDT SUN MAY 23 2004

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FLOYD COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 430 PM EDT

* AT 326 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 5  
  MILES SOUTHWEST OF FLOYD...OR JUST EAST OF WILLIS...AND MOVING   
  NORTHEAST AT 10 MPH ALONG ROUTE 221.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FLOYD BY 400 PM EDT
  8 MILES SOUTH OF CHECK BY 430 PM EDT

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

PLEASE SEND YOUR REPORTS OF PENNY 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 3689 8054 3672 8044 3688 8026 3707 8014

$$

JJ

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 23, 3:11 PM EDT, 16 minutes earlier.

Area forecast discussion, May 23, 3:11 PM EDT, 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG VA
311 PM EDT SUN MAY 23 2004

.DISCUSSION...

ANTICIPATE PATTERN OF DIURNAL CONVECTION TO CONTINUE INTO WEDNESDAY
ALONG WITH TEMPERATURES AND DEW POINTS HIGHER THAN NORMAL. WILL MAKE
FEW CHANGES IN THE FORECAST THROUGH WEDNESDAY. BIGGEST CHANGE WILL
BE TO HANDLE CURRENT CONVECTION. WILL PLACE LIKELY POPS NEAR NC/VA
BORDER INTO THE EARLY EVENING AND THEN QUICKLY DISSIPATE THE PRECIP
SHORTLY AFTER SUNSET. WILL ALSO INTRODUCE PATCHY FOG IN THIS AREA
FOR TONIGHT AFTER MIDNIGHT.

LOOKING AT THE TRENDS IN THE OVERALL GLOBAL PATTERN...BOTH THE GFS
AND ECMWF ARE CONSISTENT WITH ONE IMPORTANT FEATURE. EACH BREAK DOWN
THE CURRENT BLOCKING PATTERN OVER THE PACIFIC INTO A MORE ZONAL-LIKE
PATTERN. IN DOING SO...THE PREDOMINATE LOW-HIGH-LOW LONGWAVE PATTERN
SHIFTS ABOUT 90 DEGREES LONG EASTWARD PARKING ITSELF OVER NORTH
AMERICA. FOR THE FORECAST AREA THIS SHOULD MEAN AN EVENTUAL TREND
TOWARDS COOLER WEATHER AS WE SETTLE UNDER LONGWAVE TROUGHINESS. IT
WILL ALSO MEAN THAT THERE WILL BE A TIME PERIOD IN THE UPCOMING DAYS
OF A DISTINCT AIRMASS CHANGE AS A COLD FRONT MOVES THROUGH THE AREA.
OUR CURRENT FORECAST DEPICTS SUCH A FRONT ON WED/WED NIGHT OF THIS
WEEK WHICH LIFTS BACK NORTH BY FRIDAY...THEN A SECOND REINFORCING
COLD FRONT PUSHES SOUTH TO VERY CLOSE TO THE AREA BY THE WEEKEND.
HOWEVER...THIS FIRST COLD FRONT AND ITS REINFORCEMENT MAY THE
PRECURSORS TO AN EVEN STRONGER FRONT ON TUESDAY OR WEDNESDAY OF NEXT
WEEK WHEN THE ABOVE GLOBAL PATTERN SHIFT IS COMPLETED AND EVEN
COOLER WEATHER THAN WHAT IS EXPECTED BY THE END OF THIS WEEK ARRIVES.

IN THE EXTENDED PERIOD...PLAN ONLY A FEW CHANGES FROM CURRENT
FORECAST. WILL ADJUST POPS UP TO 60 PERCENT IN THE VICINITY OF THE
FIRST COLD FRONT WEDNESDAY EVENING. ALSO HAVE TWEAKED TEMPERATURES
DOWN A FEW DEGREES UNDER THE MEX NUMBERS IN THE LATTER PERIODS TO
ACCOUNT FOR THE SECOND REINFORCING SHOT OF COOLER AIR. POPS IN THE
LATTER PERIODS ARE ALSO TRICKY. A LOT WILL DEPEND UPON JUST HOW THE
TIMING OF THE SECOND COLD FRONT AND THE INTERVENING RETURN WARM
FRONTS COME TO PASS. FOR NOW HAVE KEPT SMALL LATE DAY/EARLY EVENING
SMALL POPS IN ALL DAYS BUT THURSDAY.

&&

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

DS

Hazardous weather outlook, May 23, 10:02 AM EDT, 5 hours 25 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE BLACKSBURG VA
1002 AM EDT SUN MAY 23 2004

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-241000-
ALLEGHANY VA-ALLEGHANY NC-AMHERST VA-APPOMATTOX VA-ASHE NC-BATH VA-
BEDFORD VA-BLAND VA-BOTETOURT VA-BUCKINGHAM VA-CAMPBELL VA-
CARROLL VA-CASWELL NC-CHARLOTTE VA-CRAIG VA-FLOYD VA-FRANKLIN VA-
GILES VA-GRAYSON VA-GREENBRIER WV-HALIFAX VA-HENRY VA-MERCER WV-
MONROE WV-MONTGOMERY VA-PATRICK VA-PITTSYLVANIA VA-PULASKI VA-
ROANOKE VA-ROCKBRIDGE VA-ROCKINGHAM NC-SMYTH VA-STOKES NC-SUMMERS WV-
SURRY NC-TAZEWELL VA-WATAUGA NC-WILKES NC-WYTHE VA-YADKIN NC-
1002 AM EDT SUN MAY 23 2004

.DAY ONE...

WIDELY SCATTERED THUNDERSTORMS WILL DEVELOP ACROSS MUCH OF THE
REGION THROUGH EARLY THIS EVENING. SOME OF THE STORMS COULD BE
LOCALLY SEVERE WITH LARGE HAIL AND DAMAGING WINDS. IN
ADDITION...VERY HEAVY DOWNPOURS MAY CAUSE BRIEF FLOODING ESPECIALLY
IN LOCATIONS THAT SAW HEAVY RAIN ON SATURDAY.

FOR ADDITIONAL WEATHER INFORMATION...VISIT OUR WEB SITE
AT...HTTP://WWW.ERH.NOAA.GOV/RNK.

.DAYS TWO THROUGH SEVEN...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

In the hours before

Local storm report, May 23, 2:32 PM EDT, 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
232 PM EDT SUN MAY 23 2004

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

0200 PM     FLASH FLOOD      8 E MARTINSVILLE AIRPOR 36.63N 79.72W
05/23/2004                   HENRY              VA   COUNTY OFFICIAL

            JONES CREEK OUT OF ITS BANKS. NUMEROUS MARTINSVILLE CITY
            STREETS FLOODED

&&

DOC

Local storm report, May 23, 2:54 PM EDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
254 PM EDT SUN MAY 23 2004

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

0245 PM     HAIL             4 SW WOODLAWN           36.68N 80.87W
05/23/2004  1.00 INCH        CARROLL            VA   PUBLIC

            OCCURRED IN THE CITY OF GALAX

&&

DOC

Local storm report, May 23, 2:55 PM EDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
255 PM EDT SUN MAY 23 2004

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

0220 PM     HAIL             5 W PENHOOK             36.98N 79.72W
05/23/2004  0.88 INCH        FRANKLIN           VA   PUBLIC

&&

DOC

Local storm report, May 23, 3:01 PM EDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
301 PM EDT SUN MAY 23 2004

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

0218 PM     HAIL             LAWSONVILLE             36.48N 80.25W
05/23/2004  0.75 INCH        STOKES             NC   PUBLIC

&&

DOC

Local storm report, May 23, 3:07 PM EDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
307 PM EDT SUN MAY 23 2004

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

0243 PM     HAIL             12 ENE INDEPENDENCE     36.68N 80.95W
05/23/2004  1.00 INCH        GRAYSON            VA   PUBLIC

&&

DOC

Local storm report, May 23, 3:19 PM EDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
319 PM EDT SUN MAY 23 2004

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

0150 PM     HAIL             CRITZ                   36.63N 80.15W
05/23/2004  0.75 INCH        PATRICK            VA   LAW ENFORCEMENT

&&

DOC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 11:47 AM EDT	Severe Thunderstorm Warning	RNK	Montgomery, City of Radford	43 min
May 23, 12:57 PM EDT	Severe Thunderstorm Warning	RNK	Henry, City of Martinsville	48 min
May 23, 1:30 PM EDT	Flash Flood Warning	RNK	Henry, City of Martinsville	3 hr
May 23, 1:40 PM EDT	Severe Thunderstorm Warning	RNK	Patrick	35 min
May 23, 1:44 PM EDT	Severe Thunderstorm Warning	RNK	Henry, City of Martinsville	46 min
May 23, 2:01 PM EDT	Severe Thunderstorm Warning	RNK	Bedford	44 min
May 23, 2:06 PM EDT	Severe Thunderstorm Warning	RNK	Franklin	39 min
May 23, 2:29 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Grayson, City of Galax	61 min
May 23, 2:40 PM EDT	Severe Thunderstorm Warning	RNK	Pittsylvania	65 min
May 23, 3:01 PM EDT	Severe Thunderstorm Warning	RNK	Patrick	44 min
May 23, 4:06 PM EDT	Severe Thunderstorm Warning	RNK	Montgomery	54 min
May 23, 4:25 PM EDT	Severe Thunderstorm Warning	RNK	Grayson	50 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2004 Every severe thunderstorm warning in 2004

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.