Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 534, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Sep 21, 1998, 10:13 PM CDT for Pontotoc County, Pottawatomie County, Seminole County, Oklahoma. It was in force for 47 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
- Sep 21, 1998, 10:13 PM CDT (03:13 UTC)
- Expired
- Sep 21, 1998, 11:00 PM CDT
- In force
- 47 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
Counties Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 21, 10:50 PM CDT | Thunderstorm Wind | Wewoka, 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 nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 3.2 hours before the alert went out and 63 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
- 562 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 2148 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 277 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 16.1
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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 21, 3:45 PM CDT, 6 hours 28 minutes earlier.
Area forecast discussion, Sep 21, 3:45 PM CDT, 6 hours 28 minutes before
FPUS3 KOKC 212051 AFDOKC AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 345 PM CDT MON SEP 21 1998 EVOLUTION OF SLOW MOVING COLD FRONT FROM CENTRAL KANSAS SOUTHWESTWARD INTO PANHANDLES AND RESULTING IMPACT TO TEMPERATURES WILL BE MAIN FORECAST CHALLENGE THIS TIME AROUND. AIR BEHIND FRONT IS THE COOLEST SO FAR THIS MONTH WITH 50S ACROSS WESTERN KANSAS THIS AFTERNOON. GIVEN CLIMATOLOGY FOR EARLY FALL COLD FRONTS...PRESSURE RISES ACROSS WESTERN KANSAS AND TRENDS IN RUC OVER PAST COUPLE OF RUNS...BELIEVE FRONT WILL PROGRESS A BIT FURTHER SOUTH THAN SUGGESTED BY THE ETA. BY TUESDAY INTO TUESDAY NIGHT BAROCLINIC ZONE WILL BE GENERALLY EAST-WEST ACROSS NORTHERN OKLAHOMA. TEMPERATURES HIGHLY DEPENDENT ON FINAL RESTING PLACE OF FRONT AND CLOUDS THUS SIGNIFICANT POTENTIAL EXISTS FOR ERROR AND LATER UPDATES. IN THE MEANTIME...SOME SEVERE STORMS POSSIBLE ALONG AND NORTH OF INTERSTATE 40 THIS EVENING WHERE HIGH CAPES MEETS OLD OUTFLOW BOUNDARY. ..16.. PRELIM NUMBERS... FCSTID = 16 OKC 68 85 63 82 / 30 30 20 20 HBR 69 93 65 92 / 20 20 20 20 SPS 69 93 65 92 / 20 20 20 20 GAG 57 68 56 78 / 30 20 20 20 PNC 61 76 64 80 / 50 30 20 20 DUA 71 94 67 89 / 20 20 20 20 .OUN... OK...NONE. TX...NONE.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 7:21 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 39 min |
| Sep 21, 7:24 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher, Logan | 51 min |
| Sep 21, 7:29 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 46 min |
| Sep 21, 7:47 PM CDT | Severe Thunderstorm Warning | OUN | Oklahoma | 43 min |
| Sep 21, 8:10 PM CDT | Severe Thunderstorm Warning | OUN | Logan | 35 min |
| Sep 21, 8:23 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Oklahoma | 52 min |
| Sep 21, 9:03 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Oklahoma, Pottawatomie | 42 min |
| Sep 21, 9:03 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain | 42 min |
| Sep 21, 9:32 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie, Seminole | 43 min |
| Sep 21, 9:32 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain | 43 min |
| Sep 21, 10:33 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, McClain | 27 min |
| Sep 21, 10:57 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, Murray, Pontotoc | 33 min |
| Sep 21, 11:28 PM CDT | Severe Thunderstorm Warning | OUN | Pontotoc | 32 min |
| Sep 22, 10:08 AM CDT | Severe Thunderstorm Warning | OUN | Garfield | 37 min |
| Sep 22, 11:30 AM CDT | Severe Thunderstorm Warning | OUN | Payne | 30 min |
| Sep 22, 12:40 PM CDT | Severe Thunderstorm Warning | OUN | Wichita | 35 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1998Every severe thunderstorm warning in 1998
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.