Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 11, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Jan 21, 1999, 7:28 PM CST for LeFlore County, Oklahoma. It was in force for 47 min. 2 reports 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
- Jan 21, 1999, 7:28 PM CST (01:28 UTC)
- Expired
- Jan 21, 1999, 8:15 PM CST
- In force
- 47 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County LeFlore County, OK
The radar
The Western Arkansas radar (KSRX), 53 km from the middle of the area, began a volume at 01:29 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 |
|---|---|---|---|
| Jan 21, 7:53 PM CST | Hail 0.88 | Heavener, OK | Location: Heavener Runestone State Park |
| Jan 21, 7:54 PM CST | Hail 0.75 | Hodgen, OK |
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 |
|---|---|---|---|
| Jan 21, 5:00 PM CST | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 1.5 hours before the alert went out and 237 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
- 852 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 1195 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 2.8
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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jan 21, 4:50 PM CST, 2 hours 38 minutes earlier.
Area forecast discussion, Jan 21, 4:50 PM CST, 2 hours 38 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 450 PM CST THU JAN 21 1999 JUST UPDATED TO ADD MENTION OF SEVERE IN A FEW ZONE GROUPINGS GIVEN THE AREAL EXTENT OF THE NEW TORNADO WATCH BOX. NEW RUN OF THE 21Z RUC SHOWS LIFTED INDICES OF -10 IN SOUTHEAST OKLAHOMA AT 06Z. MAY NEED TO UPDATE AGAIN LATER ON TO EXTEND MENTION OF SEVERE INTO LATER TONIGHT. 22 .TUL... OK...NONE. AR...NONE.
In the hours before
Local storm report, Jan 21, 4:42 PM CST, 2 hours 46 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
442 PM CST THU JAN 21 1999
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0423 PM STANLEY OK 1 INCH HAIL
01/21/99 PUSHMATAHA REPORTED BY CLAYTON CD
DIRECTORLocal storm report, Jan 21, 5:41 PM CST, 1 hour 47 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
541 PM CST THU JAN 21 1999
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0529 PM BENGAL OK 1 INCH HAIL
01/21/99 LATIMER REPORTED BY AMATEUR RADIO
SPOTTERLocal storm report, Jan 21, 6:05 PM CST, 1 hour 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
605 PM CST THU JAN 21 1999
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0545 PM LEFLORE OK 1 INCH HAIL
01/21/99 LE FLORE REPORTED BY PUBLIC
0554 PM WISTER OK 1.75 INCH HAIL
01/21/99 LE FLORE REPORTED BY AMATEUR
RADIO SPOTTER
0553 PM 8 SW CLAYTON OK 0.75 INCH HAIL
01/21/99 PUSHMATAHA REPORTED BY AMATEUR
RADIO SPOTTERThe office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 21, 6:11 PM CST | Severe Thunderstorm Warning | TSA | Latimer | 34 min |
| Jan 21, 6:11 PM CST | Tornado Warning | TSA | LeFlore | 34 min |
| Jan 21, 6:41 PM CST | Severe Thunderstorm Warning | TSA | Latimer, LeFlore, Pushmataha | 49 min |
| Jan 21, 6:49 PM CST | Severe Thunderstorm Warning | TSA | Haskell | 41 min |
| Jan 21, 8:52 PM CST | Severe Thunderstorm Warning | TSA | Choctaw | 38 min |
| Jan 21, 9:07 PM CST | Severe Thunderstorm Warning | TSA | Pushmataha | 38 min |
| Jan 21, 9:12 PM CST | Severe Thunderstorm Warning | TSA | LeFlore | 33 min |
| Jan 21, 9:45 PM CST | Severe Thunderstorm Warning | TSA | LeFlore | 45 min |
| Jan 21, 6:41 PM CST | Tornado Warning | TSA | Sebastian | 34 min |
| Jan 21, 6:53 PM CST | Severe Thunderstorm Warning | TSA | Franklin | 52 min |
| Jan 21, 7:12 PM CST | Tornado Warning | TSA | Franklin, Sebastian | 48 min |
| Jan 21, 7:20 PM CST | Severe Thunderstorm Warning | TSA | Sebastian | 40 min |
| Jan 21, 7:37 PM CST | Tornado Warning | TSA | Sebastian | 38 min |
| Jan 21, 8:13 PM CST | Tornado Warning | TSA | Franklin, Sebastian | 47 min |
| Jan 21, 10:21 PM CST | Severe Thunderstorm Warning | TSA | Crawford, Franklin, Sebastian | 24 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1999Every 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.