Alert archive / Louisiana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 78, NWS Shreveport, LA

May 10, 2002Webster Parish, Louisiana; Columbia County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at May 10, 2002, 6:17 AM CDT for Webster Parish, Louisiana; Columbia County, Arkansas. It was in force for 58 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 10, 2002, 6:17 AM CDT (11:17 UTC)
Expired: May 10, 2002, 7:15 AM CDT
In force: 58 min
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

Counties Columbia County, AR, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 89 km from the middle of the area, began a volume at 11:18 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

Shreveport, LA (KSHV), launched 00:00Z, 11.3 hours before the alert went out and 81 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: 3256 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 1148 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KSHV 101117
SVRSHV
ARC027-LAC119-101215-
/NEW.KSHV.SV.W.0155.101112-101215/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
612 AM CDT FRI MAY 10 2002

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEBSTER PARISH IN NORTHWEST LOUISIANA
  COLUMBIA COUNTY IN SOUTHWEST ARKANSAS

* UNTIL 715 AM CDT

* AT 612 AM CDT...THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER    
  RADAR INDICATED SEVERE THUNDERSTORMS NEAR TAYLOR ARKANSAS AND NEAR 
  SPRINGHILL LOUISIANA...MOVING TO THE EAST AT 50 MPH.


* THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES SOUTHWEST OF MAGNOLIA AT 620 AM
  5 MILES EAST OF SPRINGHILL AT 625 PM.

THESE THUNDERSTORMS WILL PRODUCE STRONG DAMAGING WINDS UP TO 60 MPH.

REPEATING...THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE
THUNDERSTORM WARNING FOR...
  WEBSTER PARISH IN NORTHWEST LOUISIANA
  COLUMBIA COUNTY IN SOUTHWEST ARKANSAS
UNTIL 715 AM CDT.

LAT...LON 3331 9341 3326 9342 3324 9346 3300 9346
          3275 9342 3278 9325 3304 9326 3304 9300
          3336 9299

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 May 10, 3:00 AM CDT, 3 hours 17 minutes earlier.

Area forecast discussion, May 10, 3:00 AM CDT, 3 hours 17 minutes before

AREA FORECAST DISCUSSION...CORRECTED TEMPERATURES
NATIONAL WEATHER SERVICE SHREVEPORT LA
300 AM CDT FRI MAY 10 2002

EARLY THIS MORNING THE FRONTAL SYSTEM THAT HAD MOVED INTO THE
REGION REMAINED NEARLY STATIONARY ACROSS N LA AND INTO E TX FROM
AROUND MLU TO SHV AND TYR. ALONG AND NORTH OF THIS FRONT SHOWERS
AND THUNDERSTORMS CONTINUED TO DEVELOP AND MOVE EAST AND NORTHEAST.
THE FRONTAL SYSTEM WILL BE SLOW TO LEAVE THE AREA TODAY BUT DOES
BEGIN MOVING TO THE NORTH THIS AFTERNOON AND TONIGHT. UPPER
DISTURBANCES MOVING OVER THE REGION FROM THE WEST WILL COMBINE
WITH LIFT OVER THE FRONT AND PRODUCE SHOWERS AND THUNDERSTORMS
DURING THE DAY. A FEW OF THE THUNDERSTORMS WILL BE SEVERE WITH
LOCALLY HEAVY RAINFALL WHERE THEY DO DEVELOP. TEMPERATURES WILL
BE COOLER TO THE NORTH OF THE FRONT DUE CLOUD COVER...RAIN...AND
COOLER AIR FROM SURFACE HIGH PRESSURE OVER THE OHIO AND TENNESSEE
VALLEYS. THE FRONT WILL LIFT WELL NORTH OF THE FOUR STATE REGION
BY EARLY SATURDAY MORNING AND WITH INCREASING LOW LEVEL JET
SPEEDS TEMPERATURES WILL REBOUND QUICKLY AND REACH INTO THE
80S AND NEAR 90 BY AFTERNOON. THE NEXT COLD FRONT WILL ENTER THE
NORTHWEST SECTIONS OF THE COUNTY WARNING AREA DURING THE NIGHT
SUNDAY AND OUT OF THE REGION BY LATE MONDAY.

SHV 084/068 087/069 088 5320
MLU 081/067 087/069 087 5220
TXK 077/065 086/069 086 7430
TYR 083/068 087/070 087 6220
LFK 087/069 088/070 089 3200

.SHV...NONE.

In the hours before

Local storm report, May 10, 1:17 AM CDT, 5 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT, LA
117 AM CDT FRI MAY 10 2002

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

1105 PM    5 SW TEXARKANA            TX   .75 INCH HAIL
05/09/02   BOWIE                          REPORTED BY LAW
                                          ENFORCEMENT

1205 AM    NASHVILLE                 AR   .75 INCH HAIL
05/10/02   HOWARD                         REPORTED BY LAW
                                          ENFORCEMENT

1210 AM    SARATOGA                  AR   .75 INCH HAIL
05/10/02   HOWARD                         REPORTED BY LAW
                                          ENFORCEMENT

1215 AM    WASHINGTON                AR   .75 INCH HAIL
05/10/02   HEMPSTEAD                      REPORTED BY LAW
                                          ENFORCEMENT

0105 AM    NEW BOSTON                TX   1.00 INCH HAIL
05/10/02   BOWIE                          REPORTED BY FIRE DEPT

Local storm report, May 10, 3:49 AM CDT, 2 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT, LA
349 AM CDT FRI MAY 10 2002

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

0330 AM    3 SW MAGNOLIA             AR   .75 INCH HAIL
05/10/02   COLUMBIA                       ON HWY 132
                                          REPORTED BY LAW ENFORCEMENT

Local storm report, May 10, 4:03 AM CDT, 2 hours 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT, LA
403 AM CDT FRI MAY 10 2002

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

0340 AM    MC NEIL                   AR   .75 INCH HAIL
05/10/02   COLUMBIA                       REPORTED BY LAW
                                          ENFORCEMENT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 5:43 AM CDT	Severe Thunderstorm Warning	SHV	Bossier	62 min
May 9, 11:18 PM CDT	Severe Thunderstorm Warning	SHV	Miller	57 min
May 9, 11:29 PM CDT	Severe Thunderstorm Warning	SHV	Nevada	61 min
May 9, 11:33 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead	57 min
May 9, 11:59 PM CDT	Severe Thunderstorm Warning	SHV	Howard	61 min
May 10, 12:13 AM CDT	Severe Thunderstorm Warning	SHV	Miller	62 min
May 10, 1:42 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead	63 min
May 10, 3:14 AM CDT	Severe Thunderstorm Warning	SHV	Columbia	61 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2002 Severe Thunderstorm Warnings in Arkansas, 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; radar from the NEXRAD Level II archive.