Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 114, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Apr 27, 2002, 5:35 AM CDT for Payne County, Oklahoma. It was in force for 15 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
- Apr 27, 2002, 5:35 AM CDT (10:35 UTC)
- Expired
- Apr 27, 2002, 5:50 AM CDT
- In force
- 15 min
- Issued by
- NWS Norman, OK
- Area
- Counties, with a storm outline in the text
County Payne County, OK
The radar
The Norman radar (KTLX), 87 km from the middle of the area, began a volume at 10:37 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 |
|---|---|---|---|
| Apr 27, 5:35 AM CDT | Hail 0.75 | Stillwater, 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
Lamont, OK (KLMN), launched 00:00Z, 10.6 hours before the alert went out and 75 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 538 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 246 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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 Apr 27, 2:04 AM CDT, 3 hours 31 minutes earlier.
Area forecast discussion, Apr 27, 2:04 AM CDT, 3 hours 31 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 204 AM CDT SAT APR 27 2002 BY DAYBREAK THUNDERSTORMS OVER THE WEST SHOULD HAVE EVOLVED INTO A SMALL MCS AND HAVE BEGUN TO DISSIPATE. THE UPPER SYSTEM BEGAN TO MOVE NORTHEAST ACROSS SOUTHERN CO EARLY THIS MORNING ON ITS WAY ACROSS THE CENTRAL PLAINS LATER THIS MORNING. THIS WILL HELP PUSH THE DRYLINE INTO WESTERN OK THIS MORNING AND INTO CENTRAL SECTIONS BY MID-DAY. GUSTY SOUTHWEST OR WEST WINDS WILL FOLLOW ALONG WITH CLEARING SKIES AND MUCH DRIER BOUNDARY LAYER AIR. IN THE MEAN TIME...FOG AND LOW CLOUDS WILL PERSIST NORTH OF THE WARM FRONT...WHICH WILL MOVE NORTH AND BECOME MORE DIFFUSE OVER SOUTHERN OK THIS MORNING. THE DRYLINE WILL LIKELY HANG OUT IN SOUTHEAST OK UNTIL THE SURFACE COLD FRONT MOVES ACROSS THE AREA SUNDAY. TEMPERATURES IN THE NORTHERN HALF OF THE STATE WERE LOWERED FOR SUNDAYS COOLER AIRMASS. MODEST SUBTROPICAL RIDGING OVER THE SOUTHWEST PART OF THE U.S. WILL BRING PERIODS OF CIRRUS OVER THE FORECAST AREA AFTER SUNDAY NIGHT OR MONDAY. THE NEXT CHANCE FOR RAIN STILL APPEARS TO BE WITH ANOTHER QUICK UPPER SYSTEM AND ASSOCIATE SURFACE FRONT TUESDAY AND WEDNESDAY. THE REST OF THE LONGER-TERM FORECAST REMAINS AS THE PREVIOUS ONE WITH A COOL-DOWN BY WEEKS END. FCSTID = 9 OKC 81 52 75 56 / 40 0 0 0 HBR 83 51 76 54 / 40 0 0 0 SPS 83 53 79 60 / 20 0 0 0 GAG 84 47 73 52 / 30 0 0 0 PNC 80 51 73 55 / 40 0 0 0 DUA 77 54 75 60 / 40 0 0 0 .OUN... OK...SEVERE THUNDERSTORM WATCH UNTIL 700 AM CDT SATURDAY FOR ZONES OKC003...OKC009...OKC011...OKC039...OKC043...OKC045...OKC053... OKC055...OKC057...OKC059...OKC065...OKC075...OKC093...OKC129... OKC141...OKC149...OKC151...OKC153. TX...NONE.
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2002Every severe thunderstorm warning in 2002
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.