Alert archive / Louisiana / Tornado Warnings in 1999
Tornado Warning 75, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at May 5, 1999, 4:14 AM CDT for Claiborne Parish, Louisiana. It was in force for 61 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, 4:14 AM CDT (09:14 UTC)
- Expired
- May 5, 1999, 5:15 AM CDT
- In force
- 61 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County Claiborne Parish, LA
The radar
The Shreveport radar (KSHV), 89 km from the middle of the area, began a volume at 09:16 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, 4:30 AM CDT | Hail 1 | Lake Claiborne, 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 nearest sounding before it
Shreveport, LA (KSHV), launched 00:00Z, 9.2 hours before the alert went out and 80 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.
- Mixed-layer CAPE
- 3185 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 267 m²/s²
- 0-3 km storm-relative helicity
- 270 m²/s²
- Significant tornado parameter
- 5.4
- Supercell composite
- 17.9
The text
As transmitted, in the capitals the NWS used until 2016.
999 WFUS1 KSHV 050913 RRA TORSHV LAC027-051015- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SHREVEPORT LA 414 AM CDT WED MAY 5 1999 THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A * TORNADO WARNING FOR... CLAIBORNE PARISH IN NORTHWESTERN LOUISIANA * UNTIL 515 AM CDT * AT 410 AM CDT... THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO 10 MILES SOUTHWEST OF HOMER LOUISIANA. THE THUNDERSTORM CONTAINING THIS TORNADO WAS MOVING NORTHEAST AT 30 MPH . * THE TORNADO IS EXPECTED TO BE NEAR... AYCOCK NEAR 430 AM CDT THIS THUNDERSTORM CAN PRODUCE A TORNADO THAT IS OBSCURED BY RAIN AND DIFFICULT TO SEE. GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.
What forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at May 5, 2:50 AM CDT, 1 hour 24 minutes earlier.
Area forecast discussion, May 5, 2:50 AM CDT, 1 hour 24 minutes before
FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 250 AM CDT WED MAY 5 1999 STUBBORN AREA OF SHOWERS AND THUNDERSTORMS STILL OCCURRING JUST NORTHWEST AND NORTH OF SHV. IR SATELLITE SHOWS UPPER LOW SPINNING OVER THE NORTHERN PLAINS WITH LARGE AREA OF SHOWERS AND THUNDERSTORMS OVER TENNESSESS...EASTERN ARKANSAS AND NORTHEAST LOUISIANA. SURFACE LOW CENTERED OVER NEBRASKA WITH DRY LINE OVER CENTRAL OKLAHOMA INTO NORTH CENTRAL TEXAS. MODELS SHOW 5H LOW CONTINUEING TO SPIN ACROSS THE NORTHERN PLAINS AND GRADUALLY WORK TO THE EAST INTO THE WESTERN GREAT LAKES BY THURSDAY NIGHT AS UPPER RIDGE DEVELOPS OVER THE ROCKIES. SURFACE COLD FRONT WILL MOVE THROUGH CWA TODAY AND WITH LOW LEVEL MOISTURE IN PLACE AND UPPER LEVEL DIVERGENCE AND JET MAX COMING ACROSS TEXAS SCATTERED SHOWERS AND THUNDERSTORMS MAY DEVELOP JUST AHEAD OF THE FRONT IN LOUISIANA AND ARKANSAS. WITH CAPE VALUES PROGGED TO BE OVER 2000 AND LITTLE CAP SOME STORMS MAY BE SEVERE IN SOUTH CENTRAL ARKANSAS AND NORTH CENTRAL LOUISIANA THIS AFTERNOON AND EARLY THIS EVENING. AS MUCH DRIER AIR MOVES IN TONIGHT SKIES WILL CLEAR AND TEMPERATURES WILL BE COOLER. HIGHS SHOULD BE ABOUT 5 DEGREES COOLER THURSDAY. POPS GUIDANCE SEEM TOO LOW SO WENT HIGHER AND LOWERED MAX TEMPS SLIGHTLY TODAY AND RAISED TEMPS FOR OTHER PERIODS. BELIEVE MLU MAY AREA MAY SEE CHANCE OF THUNDERSTORMS WELL INTO THIS EVENING. CLOUDY SKIES THIS MORNING SHOULD BECOME PARTLY CLOUDY TODAY EXCEPT OVER NORTH CENTRAL LOUISIANA. SHV 85/58/79/53 3311 MLU 86/60/80/53 4511 TXK 83/52/77/50 3110 TYR 83/55/78/51 2110 LFK 87/57/80/52 3210 09
In the hours before
Local storm report, May 4, 11:25 PM CDT, 4 hours 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1125 PM CDT TUE MAY 04 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....PARISH/COUNTY LOCATION....
1015 PM DUBBERLY LA .75 INCH HAIL
05/04/99 WEBSTER REPORTED BY SPOTTER.
1040 PM BRYCELAND LA 1 INCH HAIL
05/04/99 BIENVILLE REPORTED BY LAW
ENFORCEMENT.
1055 PM SIMSBORO LA 1.75 INCH HAIL
05/04/99 LINCOLN REPORTED BY LAW
ENFORCEMENT.
20Local storm report, May 4, 11:34 PM CDT, 4 hours 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1134 PM CDT TUE MAY 04 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....PARISH/COUNTY LOCATION....
1115 PM RUSTON LA .75 INCH HAIL
05/04/99 LINCOLN REPORTED BY LAW
ENFORCEMENT.
20Local storm report, May 5, 12:00 AM CDT, 4 hours 14 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1200 AM CDT WED MAY 05 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....PARISH/COUNTY LOCATION....
0730 PM 8 NE JEFFERSON TX WIND DAMAGE
05/04/99 MARION TREES DOWN ON HWY 49. EST
WINDS AT 60 MPH. REPORTED
BY LAW ENFORCEMENT.
20The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 7:49 PM CDT | Severe Thunderstorm Warning | SHV | Caddo | 31 min |
| May 4, 9:13 PM CDT | Severe Thunderstorm Warning | SHV | Webster | 47 min |
| May 4, 10:15 PM CDT | Severe Thunderstorm Warning | SHV | Bienville | 65 min |
| May 4, 10:30 PM CDT | Tornado Warning | SHV | Bienville | 50 min |
| May 4, 10:38 PM CDT | Tornado Warning | SHV | Lincoln | 62 min |
| May 4, 11:51 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita | 49 min |
| May 5, 6:29 AM CDT | Severe Thunderstorm Warning | SHV | Union | 56 min |
| May 5, 6:41 AM CDT | Tornado Warning | SHV | Union | 49 min |
| May 5, 2:15 PM CDT | Severe Thunderstorm Warning | SHV | Caddo | 35 min |
| May 5, 2:15 PM CDT | Severe Thunderstorm Warning | SHV | Bossier | 35 min |
| May 5, 2:50 PM CDT | Severe Thunderstorm Warning | SHV | Bossier, Caddo | 50 min |
| May 5, 3:28 PM CDT | Severe Thunderstorm Warning | SHV | Webster | 47 min |
| May 5, 3:40 PM CDT | Severe Thunderstorm Warning | SHV | De Soto | 50 min |
| May 5, 3:40 PM CDT | Severe Thunderstorm Warning | SHV | Bossier, Caddo | 50 min |
| May 5, 4:18 PM CDT | Severe Thunderstorm Warning | SHV | Claiborne | 47 min |
| May 5, 4:38 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Webster | 47 min |
| May 5, 5:32 PM CDT | Severe Thunderstorm Warning | SHV | Caldwell, Winn | 48 min |
| May 5, 6:37 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita | 48 min |
Nearby
Tornado Warnings in Louisiana, 1999Every tornado warning in 1999Tornadoes 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.