Alert archive / Oklahoma / Tornado Warnings in 1999
Tornado Warning 48, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at May 4, 1999, 1:21 PM CDT for McCurtain County, Oklahoma. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 4, 1999, 1:21 PM CDT (18:21 UTC)
- Expired
- May 4, 1999, 1:55 PM CDT
- In force
- 34 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County McCurtain County, OK
The radar
The Western Arkansas radar (KSRX), 136 km from the middle of the area, began a volume at 18:22 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 4, 11:00 AM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 6.4 hours before the alert went out and 205 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
- 1116 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 498 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 275 m²/s²
- 0-3 km storm-relative helicity
- 392 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 12.5
The text
As transmitted, in the capitals the NWS used until 2016.
999 WFUS1 KSHV 041822 RRA TORSHV OKC089-041855- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SHREVEPORT LA 121 PM CDT TUE MAY 4 1999 THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A * TORNADO WARNING FOR... NORTHEASTERN MCCURTAIN COUNTY IN SOUTHEASTERN OKLAHOMA * UNTIL 155 PM CDT * AT 120 PM CDT... DOPPLER WEATHER RADAR INDICATED A TORNADO OVER BROKEN BOW RESERVOIR. THE THUNDERSTORM CONTAINING THIS TORNADO WAS MOVING NORTHEAST AT 30 MPH. * THE TORNADO IS EXPECTED TO BE NEAR... SMITHVILLE BY 140 PM 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 4, 10:00 AM CDT, 3 hours 21 minutes earlier.
Area forecast discussion, May 4, 10:00 AM CDT, 3 hours 21 minutes before
FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 1000 AM CDT TUE MAY 4 1999 CURRENT FORECAST STILL ON TRACK. LATEST ETA RUN SHOWS MID LEVEL JET KICKING IN AROUND 18Z OVER CWA. ONLY SAVING GRACE AT THIS TIME IS THE CLOUD COVER...WHICH IS HELPING TO HOLD STABILITY DOWN A TAD AS WELL AS SURFACE WIND BELOW WIND ADVISORY THRESHOLD. THIS MAY CHANGE IF LARGE UNANTICIPATED BREAKS OCCUR. BUT UNTIL ANY UNFORESEEN CHANGES OCCUR..FORECAST CAN CONTINUE AS IS. 14
In the hours before
Special weather statement, May 4, 10:10 AM CDT, 3 hours 11 minutes before
ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096- 097-108>112-124>126-136>138-149>153-165>167-041630- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1010 AM CDT TUE MAY 4 1999 ...AN OUTBREAK OF SEVERE WEATHER COULD AFFECT MOST OF THE THE FOUR STATE REGION TODAY AND TONIGHT... THERE IS HIGH RISK OF SEVERE THUNDERSTORMS TODAY AND TONIGHT FOR ALL OF NORTHEAST TEXAS...NORTH LOUISIANA...SOUTHERN ARKANSAS AND MC CURTAIN COUNTY IN SOUTHEAST OKLAHOMA. THE AIRMASS ACROSS THE AREA IS MOIST AND UNSTABLE. A STRONG UPPER LEVEL STORM SYSTEM WILL MOVE ACROSS THE CENTRAL PLAINS TODAY AND TONIGHT. THUNDERSTORMS WILL LIKELY DEVELOP ACROSS NORTHEAST TEXAS AND SOUTHERN OKLAHOMA BY EARLY THIS AFTERNOON AND CONTINUE THROUGH THE EVENING HOURS. WINDS IN THE LOWER LEVELS OF THE ATMOSPHERE REMAIN FAVORABLE FOR THE DEVELOPMENT OF ROTATING STORMS. THEREFORE THE THREAT WILL EXIST FOR A FEW TORNADOES IN ADDITION TO LARGE HAIL AND DAMAGING STRAIGHT LINE WIND. THIS IS A POTENTIALLY DANGEROUS WEATHER SITUATION. RESIDENTS IN THE FOUR STATE REGION ARE URGED TO REVIEW SEVERE WEATHER SAFETY RULES AND TO LISTEN TO RADIO...TELEVISION AND NOAA WEATHER RADIO FOR POSSIBLE WATCHES...WARNINGS AND STATEMENTS LATER TODAY. ACTIVATION OF STORM SPOTTERS...EMERGENCY MANAGEMENT OFFICIALS AND HAM RADIO OPERATORS WILL LIKELY BE REQUIRED THIS AFTERNOON AND TONIGHT. 14
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 2:57 PM CDT | Severe Thunderstorm Warning | SHV | McCurtain | 63 min |
| May 4, 4:16 PM CDT | Severe Thunderstorm Warning | SHV | McCurtain | 49 min |
Nearby
Tornado Warnings in Oklahoma, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.