Alert archive / Louisiana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 132, NWS Shreveport, LA

July 22, 2002Jackson Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Jul 22, 2002, 7:31 PM CDT for Jackson Parish, Louisiana. It was in force for 29 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 22, 2002, 7:31 PM CDT (00:31 UTC)
Expired: Jul 22, 2002, 8:00 PM CDT
In force: 29 min
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

County Jackson Parish, LA

The radar

The Shreveport radar (KSHV), 123 km from the middle of the area, began a volume at 00:35 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.

What was reported inside it

Time	Report	Where	Remark
Jul 22, 7:45 PM CDT	Hail 0.88	Weston, LA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.5 hours before the alert went out and 243 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: 3548 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1067 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 31 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.

631 
WUUS54 KSHV 230031
SVRSHV
LAC049-230100-
/NEW.KSHV.SV.W.0255.230030-230100/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
730 PM CDT MON JUL 22 2002

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JACKSON PARISH IN NORTH CENTRAL LOUISIANA

* UNTIL 800 PM CDT

* AT 730 PM CDT...THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER
  RADAR INDICATED A SEVERE THUNDERSTORM OVER SOUTH CENTRAL JACKSON
  PARISH...OR ABOUT 10 MILES EAST OF JONESBORO.  THE STORM WAS NEARLY
  STATIONARY.

THIS THUNDERSTORM WILL PRODUCE LARGE HAIL UP TO ONE INCH IN DIAMETER 
AND STRONG DAMAGING WINDS UP TO 60 MPH. DO NOT REMAIN OUTSIDE.

REPEATING...THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE
THUNDERSTORM WARNING FOR...
  JACKSON PARISH IN NORTH CENTRAL LOUISIANA
UNTIL 800 PM CDT.

LAT...LON 3220 9269 3216 9247 3226 9237 3235 9255

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 Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 22, 1:50 PM CDT, 5 hours 41 minutes earlier.

Area forecast discussion, Jul 22, 1:50 PM CDT, 5 hours 41 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
150 PM CDT MON JUL 22 2002

SFC RIDGE AXIS LOCATED ACROSS SE TX/SW LA COAST THIS AFTERNOON
WITH SEABREEZE VERY UNEVENTFUL AS A RESULT. CONVECTION CONTINUING
TO FIRE ACROSS PORTIONS OF MISS AND LOOK FOR THIS TO CONTINUE AND
WITH FURTHER HEATING...PERHAPS A FEW STORMS DEVELOPING ACROSS N
CENTRAL LA WHERE SLIGHTLY BETTER DEEP LAYER MOISTURE EXISTS AND
HIGHER INSTABILITY. AS HAS BEEN THE CASE THE LAST SEVERAL NIGHTS...
ISOLATED THUNDERSTORMS SHOULD DISSIPATE A COUPLE OF HOURS AFTER
SUNSET. MAY GO AHEAD AND DECIDE TO INCLUDE ISOLATED FURTHER WEST
INTO EAST TEXAS LAKES AREA BUT WILL MAKE THIS DECISION AT ISSUANCE
TIME.

MODELS ALL CONSISTENT ON THEIR HANDLING OF APPROACHING COLD FRONT
TUESDAY NIGHT THROUGH THURSDAY AND THEIR HANDLING OF POSSIBLE
PRECIP ACCOMPANYING THIS FRONT. CURRENT FCST HAS LOW CHANCE POPS
BY AFTERNOON ACROSS OUR EXTREME NORTHWEST COUNTIES...AND TAKING
THIS WORDING SOUTH TO AR/LA BORDER FOR TUE NIGHT AND AREA WIDE
FOR WEDNESDAY. SEE NOTHING TO CHANGE THIS WAY OF THINKING IN 12Z
MODEL OUTPUT AS BOTH AVN/ETA SIMILAR IN FRONTAL POSITION. STILL
LOOKING AS IF FRONT WILL WASH OUT LATE THU/FRI AS MID LEVEL
RIDGE AXIS SHIFTS EASTWARD FROM OK/INTO AR SAT MORNING. MAY
SEE SOME COOLER OVERNIGHT TEMPS ACROSS NORTHERN SECTIONS THU
THROUGH SAT TIME PERIOD BUT SLIGHTLY DRIER AIR WILL RESULT IN
RAPID WARM UP DURING THE AFTERNOONS AND MEX ALREADY PICKING UP
ON THIS WITH UPPER 90S BY END OF THE WORK WEEK. WILL STICK WITH
CURRENT MID 90S THIS FAR OUT...BUT AT LEAST HEAT INDICES SHOULD
RELAX A LITTLE.

AS FOR HEAT INDICES...WILL INCLUDE HEADLINE ONE MORE DAY WITH
INCREASED CLOUDS HOPEFULLY ALLOWING THE HEADLINE TO DIE A QUICK
BUT TEMPORARY DEATH FOR WED.

PRELIMS TO FOLLOW...13.
SHV 76/96/74/93 0123
MLU 75/95/73/92 2223
TXK 77/96/73/92 0233
TYR 77/94/75/92 0023
LFK 74/96/73/93 1123

.SHV...NONE.

In the hours before

Local storm report, Jul 22, 5:17 PM CDT, 2 hours 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT, LA
517 PM CDT MON JUL 22 2002

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

0450 PM    JENA                      LA   WIND DAMAGE
07/22/02   LA SALLE                       NUMEROUS TREES AND
                                          POWERLINES BLOWN DOWN.
                                          REPORTED BY LAW
                                          ENFORCEMENT.

0510 PM    TROUT                     LA   WIND DAMAGE
07/22/02   LA SALLE                       NUMEROUS TREES AND
                                          POWERLINES BLOWN DOWN.
                                          REPORTED BY LAW
                                          ENFORCEMENT.

03

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 22, 7:07 PM CDT	Severe Thunderstorm Warning	SHV	Jackson	23 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.