Alert archive / North Carolina / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 198, NWS Blacksburg, VA

July 4, 2002Caswell County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 4, 2002, 5:42 PM EDT for Caswell County, North Carolina. 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 counties it named.

The facts

Issued: Jul 4, 2002, 5:42 PM EDT (21:42 UTC)
Expired: Jul 4, 2002, 6:30 PM EDT
In force: 48 min
Issued by: NWS Blacksburg, VA
Area: Whole counties

County Caswell County, NC

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 9.7 hours before the alert went out and 91 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: 812 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1004 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 5 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.

767 
WUUS51 KRNK 042142
SVRRNK
NCC033-042230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
541 PM EDT THU JUL 4 2002

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CASWELL COUNTY IN NORTH CENTRAL NORTH CAROLINA

* UNTIL 630 PM EDT.

* AT 541 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 2 MILES SOUTHWEST OF YANCEYVILLE...MOVING
  SOUTHWEST AT 20 MPH.

HAIL UP TO QUARTER SIZE CAN BE EXPECTED WITH THIS STORM.

SOME LOCATIONS THREATENED THROUGH 630 PM EDT INCLUDE
  YANCEYVILLE...

RELAY SEVERE WEATHER REPORTS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1...8 6 6...2 1 5...4 3 2 4.

$$

10

LAT...LON 3641 7948 3626 7935 3644 7917 3654 7931

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 Jul 4, 3:13 PM EDT, 2 hours 29 minutes earlier.

Area forecast discussion, Jul 4, 3:13 PM EDT, 2 hours 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG, VA
313 PM EDT THU JUL 4 2002

SHORT RANGE...

HERE WE GO AGAIN...GOING WITH HIGHEST POPS OVER THE MTNS...TAPERING
TO 30 IN THE PIEDMONT...AS BEST THETA-E AIR AND CONVERGENCE WILL
REMAIN THIS EVENING FROM SRN SHD VLY-SW VA/NW NC MTNS. MODELS KEEP
UPPER LEVEL ENERGY AROUND THROUGH THE EVENING.  DISTINCT FRONTAL
BOUNDARY ARRIVES INTO THE NRN PART OF VA OVERNIGHT....SO WILL KEEP
SHOWERS CHANCES GOING INTO EARLY OVNT.

BOTH AVN/ETA SHOW NVA ARRIVING DURING THE DAY FRIDAY...WITH UPPER
TROF DIGGING ACROSS THE NORTHEAST. FRONTAL BOUNDARY SLIPS SOUTH INTO
THE FA...AND APPEARS BEST MOISTURE CONVERGENCE WILL BE IN OUR SRN
FA...DURING THE AFTN.

FRONT FINALLY SINKS SOUTH OF THE FA FRIDAY NIGHT...WITH SFC HIGH
BUILDING IN FOR SATURDAY...SHOULD MAKE FOR A COMFORTABLE LESS HUMID
DAY.

EXTENDED...

CURRENT EXTENDED APPEARS ON TRACK...WITH COLD FRONT APPROACHING FA
TUESDAY AND PASSING THROUGH BY LATE WED. WILL LEAVE A CHANCE IN NEXT
THURSDAY...AND FRONTAL MOVEMENT MAY BE SLOWER AND NOT AS FAR SOUTH
AS MODELS HAVE IT.

PRELIMS ONLY.
FCSTID = 5
ROA   68  92  64  84 /  40  30  20  10
LYH   68  92  66  83 /  30  30  20  10
DAN   69  95  67  86 /  30  40  30  10
BLF   62  83  59  80 /  40  40  30  10
LWB   59  82  55  79 /  40  30  20  10
BCB   61  87  59  80 /  40  30  30  10
TNB   60  84  62  80 /  50  40  30  20

.RNK...
NC...NONE.
VA...NONE.
WV...NONE.

WHP

In the hours before

Local storm report, Jul 4, 11:52 AM EDT, 5 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
1152 AM EDT THU JUL 04 2002

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

330 PM     APPOMATTOX                VA   1.00 INCH HAIL
07/03/02   APPOMATTOX                     REPORTED BY POLICE.

500 PM     INDIAN VALLEY             VA   1.00 INCH HAIL
07/03/02   FLOYD                          PUBLIC REPORT

530 PM     MEADOWS OF DAN            VA   0.75 INCH HAIL
07/03/02   PATRICK                        REPORTED BY PATRICK
                                          COUNTY 911.

555 PM     BLACKSBURG                VA   0.75 INCH HAIL
07/03/02   MONTGOMERY                     PUBLIC REPORT

Special weather statement, Jul 4, 12:04 PM EDT, 5 hours 38 minutes before

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-042300-

SPECIAL WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
NOON EDT THU JUL 4 2002

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING...

THUNDERSTORMS WILL DEVELOP THIS INDEPENDENCE DAY...ESPECIALLY DURING
THE AFTERNOON AND EVENING HOURS ACROSS SOUTHEASTERN WEST
VIRGINIA...SOUTHWESTERN VIRGINIA AND NORTHWESTERN NORTH CAROLINA.
SOME OF THE THUNDERSTORMS MAY BECOME SEVERE WITH DAMAGING WINDS AND
LARGE HAIL.

IN ADDITION...THE ATMOSPHERE REMAINS VERY MOIST.  VERY HEAVY RAIN
WILL OCCUR WITH SOME OF THE STORMS...WITH RAINFALL RATES UP TO 2
INCHES PER HOUR.  FLASH FLOODING IS A POSSIBILITY IN THE HEAVIER
RAIN...ESPECIALLY WHERE HEAVY THUNDERSTORM RAINS OCCURRED DURING
RECENT DAYS.

SKYWARN MAY NEED TO BE ACTIVATED THIS AFTERNOON.

07

Local storm report, Jul 4, 4:37 PM EDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
437 PM EDT THU JUL 04 2002

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

400 PM     HILLSVILLE                VA   0.75 INCH HAIL
07/04/02   CARROLL                        REPORTED BY POLICE.

Local storm report, Jul 4, 5:37 PM EDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
537 PM EDT THU JUL 04 2002

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

500 PM                               NC   WIND DAMAGE
07/04/02   ASHE                           NUMEROUS TREES AND
                                          POWERLINES DOWN
                                          COUNTYWIDE

515 PM     COLEVILLE                 NC   1.00 INCH HAIL
07/04/02   STOKES                         AT BRIGGS EXXON STATION

515 PM     ELKIN                     NC   WIND DAMAGE
07/04/02   SURRY                          TREES DOWN ACROSS
                                          MOUNTAIN PARK ROAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 4:29 PM EDT	Severe Thunderstorm Warning	RNK	Ashe	46 min
Jul 4, 4:56 PM EDT	Severe Thunderstorm Warning	RNK	Surry	34 min
Jul 4, 5:02 PM EDT	Severe Thunderstorm Warning	RNK	Stokes	28 min
Jul 4, 5:22 PM EDT	Severe Thunderstorm Warning	RNK	Yadkin	38 min
Jul 4, 5:44 PM EDT	Severe Thunderstorm Warning	RNK	Wilkes	46 min
Jul 4, 5:55 PM EDT	Severe Thunderstorm Warning	RNK	Yadkin	50 min
Jul 4, 6:16 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham	44 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2002 Every severe thunderstorm warning in 2002

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.