Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 253, NWS Shreveport, LA

May 5, 1999Caldwell Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 5, 1999, 7:37 PM CDT for Caldwell Parish, Louisiana. It was in force for 48 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 5, 1999, 7:37 PM CDT (00:37 UTC)
Expired: May 5, 1999, 8:25 PM CDT
In force: 48 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Caldwell Parish, LA

The radar

The Ft Polk radar (KPOE), 132 km from the middle of the area, began a volume at 00:41 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
May 5, 7:55 PM CDT	Hail 1.75	Hebert, 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 5, 2:45 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.6 hours before the alert went out and 159 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: 477 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1683 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: -115 m²/s²
0-3 km storm-relative helicity: -20 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -3.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 5, 2:45 PM CDT, 4 hours 52 minutes earlier.

Area forecast discussion, May 5, 2:45 PM CDT, 4 hours 52 minutes before

FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
245 PM CDT WED MAY 5 1999

ZIPPY SEVERE STORMS STARTING ALONG DRYLINE. FRONTAL BOUNDARY ALSO
SEEN ALONG RED RIVER OF NORTH TEXAS. DON/T THINK A SECOND ROUND IS
IN STORE ALONG FRONT...SO WILL FOCUS MAINLY ON DRYLINE. BEHIND
DRYLINE WILL KEEP A FEW LOW POPS BUT WON/T JUMP THROUGH HOOPS. DRY
FORECAST FOR THURSDAY THROUGH FRIDAY. DRYLINE CURRENTLY ON DOORSTEP
OF TXK/GGG. RAPIDLY DEVELOPING SQUALL LINE APPROACHING SHV.

WILL FINISH UP EXTENDED A LITTLE LATER...WILL ISSUE SHADOWS EARLY IN
ORDER TO JUMP BACK INTO THE SEVERE WEATHER FRYING PAN. GUIDANCE
TEMPS NOT TOO BAD.

SHV  57/80/54/80 5000   MLU  59/82/55/80 7000   TXK  53/76/50/77 2000
TYR  53/78/51/80 0000   LFK  56/82/54/82 5000

17

In the hours before

Local storm report, May 5, 4:05 PM CDT, 3 hours 32 minutes before

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Local storm report, May 5, 4:44 PM CDT, 2 hours 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
444 PM CDT WED MAY 05 1999

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

0250 PM    1 S TAYLOR                AR   .75 INCH HAIL
05/05/99   COLUMBIA                       REPORTED BY SPOTTER.

0300 PM    2 S CARTHAGE              TX   .75 INCH HAIL
05/05/99   PANOLA                         AT INTERSECTION OF HWY 59
                                          AND HWY 2517. REPORTED BY
                                          LAW ENFORCEMENT.

0342 PM    BOSSIER CITY              LA   1.75 INCH HAIL
05/05/99   BOSSIER                        REPORTED BY SPOTTER.

0348 PM    BOSSIER CITY              LA   1 INCH HAIL
05/05/99   BOSSIER                        REPORTED BY SPOTTER.

0407 PM    GRAND CANE                LA   1 INCH HAIL
05/05/99   DE SOTO                        REPORTED BY SPOTTER.

20

Local storm report, May 5, 5:41 PM CDT, 1 hour 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
541 PM CDT WED MAY 05 1999

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

0225 PM    1 W NACOGDOCHES           TX   1 INCH HAIL
05/05/99   NACOGDOCHES                    REPORTED BY LAW
                                          ENFORCEMENT.

0240 PM    GARRISON                  TX   1 INCH HAIL
05/05/99   NACOGDOCHES                    REPORTED BY LAW
                                          ENFORCEMENT.

0437 PM    SUMMERFIELD               LA   .75 INCH HAIL
05/05/99   CLAIBORNE                      REPORTED BY SPOTTER.

0440 PM    4 SW SIBLEY               LA   .5 INCH HAIL
05/05/99   WEBSTER                        OCCURRING ON LAKE
                                          BISTINEAU. REPORTED BY
                                          BROADCAST MEDIA.

20

Local storm report, May 5, 7:35 PM CDT, 2 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 7:12 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	48 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1999 Every severe thunderstorm warning in 1999

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.