Alert archive / Texas / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 310

May 17, 20024 states

The Storm Prediction Center issued this severe thunderstorm watch at May 17, 2002, 5:00 AM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 17, 2002, 5:00 AM CDT (10:00 UTC)
Expired: May 17, 2002, 10:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 50 counties

Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Webster Parish, LA, Bryan County, OK, Love County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Montague County, TX, Morris County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 114 km from the middle of the area, began a volume at 10:00 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

Shreveport, LA (KSHV), launched 00:00Z, 10.0 hours before the alert went out and 118 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: 2917 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1247 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 54 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.

000 
WWUS20 KWNS 170953
SEL0  
SPC WW 170944
ARZ000-LAZ000-OKZ000-TXZ000-171500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 310
STORM PREDICTION CENTER NORMAN OK
444 AM CDT FRI MAY 17 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   SOUTHWEST ARKANSAS                           
   NORTHWEST LOUISIANA                          
   EXTREME SOUTHEAST OKLAHOMA                           
   NORTH CENTRAL AND NORTHEAST TEXAS                              

EFFECTIVE THIS FRIDAY MORNING FROM 500 AM UNTIL 1000 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 135 STATUTE MILES
EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHWEST OF PARIS
TEXAS TO 30 MILES SOUTH SOUTHEAST OF LONGVIEW TEXAS.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 308...WW 309...

DISCUSSION...SRN END OF CNTRL/ERN OK BOW EXPECTED TO CONTINUE SSE
INTO N TX LATER MORNING AS CELL PROPAGATION CONTINUES INTO SSWLY
LOW LEVEL JET.  VERY UNSTABLE INFLOW AIR WILL MAINTAIN THREAT FOR
HAIL/LOCALLY DAMAGING WINDS DESPITE MORE MODEST SHEAR IN THIS
REGION RELATIVE TO POINTS FARTHER N.  OTHER STORMS MAY DEVELOP
LATER THIS MORNING ON WRN END OF BOW...AS A RESULT OF BOUNDARY
INTERACTIONS WITH COLD FRONT NOW SURGING SE ACROSS SW OK.  

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 29030.

...CORFIDI

335,0931 315,0921 315,0964 335,0975

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 2:00 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 21 more	5 hr
May 17, 6:30 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Carroll, Clark, Cleburne, Conway and 36 more	4 hr
May 16, 10:00 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 32 more	6 hr
May 17, 2:30 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Atoka, Blaine, Caddo, Canadian, Carter and 36 more	5 hr
May 17, 5:00 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bexar, Dimmit, Duval, Edwards and 17 more	5 hr

Nearby

Severe Thunderstorm Watches in Texas, 2002 Severe Thunderstorm Watches in Louisiana, 2002 Severe Thunderstorm Watches in Arkansas, 2002 Every severe thunderstorm watch 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; radar from the NEXRAD Level II archive.