Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 105, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Apr 15, 1990, 3:47 PM CDT for Coal County, Pontotoc County, Oklahoma. It was in force for 43 min. 3 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
- Apr 15, 1990, 3:47 PM CDT (20:47 UTC)
- Expired
- Apr 15, 1990, 4:30 PM CDT
- In force
- 43 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
Counties Coal County, OK, Pontotoc County, OK
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 15, 3:51 PM CDT | Hail 1 | Pontotoc, OK | |
| Apr 15, 4:30 PM CDT | Hail 1.75 | Pontotoc, OK | |
| Apr 15, 4:35 PM CDT | Hail 1.75 | Coal, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 8.8 hours before the alert went out and 104 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1962 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 238 m²/s²
- 0-3 km storm-relative helicity
- 275 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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.
In the hours before
Special weather statement, Apr 15, 1:16 PM CDT, 2 hours 31 minutes before
OKZALL-141200- OKLAHOMA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 100 PM CDT SAT APR 14 1990 ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND TONIGHT OVER MUCH OF THE STATE SOUTHEAST OF A HOLLIS TO CLINTON TO VINITA LINE. A COLD FRONT IS LOCATED FROM NEAR BARTLESVILLE TO CHILDRESS TEXAS. BEHIND THE FRONT GUSTY NORTHEAST WINDS ARE BRINGING SLIGHTLY DRIER AND COOLER AIR INTO THE NORTHWEST PORTION OF THE STATE. A WINDSHIFT LINE IS MOVING SOUTHWARD THROUGH SOUTH CENTRAL AND SOUTHWEST OKLAHOMA WELL AHEAD OF THE FRONT. THIS WINDSHIFT LINE DEVELOPED AS A RESULT OF THUNDERSTORMS THAT OCCURRED MOST OF THE MORNING OVER THE NORTHEAST PORTION OF THE STATE. A DRYLINE IS LOCATED FROM JUST EAST OF CHILDRESS SOUTHWESTWARD INTO SOUTHWEST TEXAS. EAST OF THE DRYLINE VERY MOIST AIR IS FLOWING NORTHWARD INTO OKLAHOMA. TEMPERATURES ARE WARMING RAPIDLY AHEAD OF THE FRONT AND AHEAD OF THE WINDSHIFT LINE OVER THE SOUTHWEST PORTION OF THE STATE. < WITH ADDITIONAL HEATING THIS AFTERNOON THUNDERSTORMS MAY DEVELOP OVER THE SOUTHWEST PORTION OF THE STATE. IF THE THUNDERSTORMS DO DEVELOP THEY WILL LIKELY BECOME SEVERE. THE THUNDERSTORMS OCCURRING OVER NORTHEASTERN OKLAHOMA MAY INTENSIFY THIS AFTERNOON AND BECOME SEVERE AS THEY MOVE SOUTHEAST. CIVIL DEFENSE AND STORM SPOTTER GROUPS ACROSS THE AREA SHOULD REMAIN ALERT AND BE READY FOR ACTIVITATION THIS AFTERNOON AND TONIGHT.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 4:27 PM CDT | Severe Thunderstorm Warning | OUN | Coal | 48 min |
| Apr 15, 4:52 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Johnston | 38 min |
| Apr 15, 5:23 PM CDT | Flash Flood Warning | OUN | Atoka, Coal, Johnston | 2 hr |
| Apr 15, 5:34 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Johnston | 56 min |
| Apr 15, 5:42 PM CDT | Severe Thunderstorm Warning | OUN | Jefferson | 48 min |
| Apr 15, 6:28 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Bryan, Johnston | 62 min |
| Apr 15, 6:32 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Jefferson, Love | 43 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1990Every severe thunderstorm warning in 1990
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.