Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 405, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 24, 2002, 5:39 AM CDT for Alfalfa County, Grant County, Oklahoma. It was in force for 21 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
- Aug 24, 2002, 5:39 AM CDT (10:39 UTC)
- Expired
- Aug 24, 2002, 6:00 AM CDT
- In force
- 21 min
- Issued by
- NWS Norman, OK
- Area
- Counties, with a storm outline in the text
Counties Alfalfa County, OK, Grant County, OK
The radar
The Vance AFB radar (KVNX), 7 km from the middle of the area, began a volume at 10:40 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 |
|---|---|---|---|
| Aug 24, 5:50 AM CDT | Thunderstorm Wind 50 E | Cherokee, 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Lamont, OK (KLMN), launched 00:00Z, 10.7 hours before the alert went out and 54 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
- 2266 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 2009 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -105 m²/s²
- 0-3 km storm-relative helicity
- -77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.7
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 Aug 24, 4:10 AM CDT, 1 hour 29 minutes earlier.
Area forecast discussion, Aug 24, 4:10 AM CDT, 1 hour 29 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 410 AM CDT SAT AUG 24 2002 MCS OVER KANSAS EXPECTED TO CONTINUE MOVING/PROPAGATING EAST/SOUTHEAST THROUGH THE MORNING AND WILL LIKELY AFFECT NORTH CENTRAL OKLAHOMA AT A MINIMUM. ONGOING SCATTERED TSTMS IN NORTH CENTRAL OKLAHOMA WILL ALSO DRIFT SLOWLY EAST. DOUBT WELL SEE MUCH DECREASE IN ACTIVITY THE NEXT FEW HOURS. ETA CONTINUES TO INDICATE AN UNSEASONABLE STRONG JET MAX MOVING INTO THE CENTRAL PLAINS WITH UPPER LEVEL DIVERGENCE CONTINUING OVER NORTHERN OKLAHOMA THROUGH EARLY AFTERNOON. PCPTBL WATER 1.5 TO 2.0 INCHES ALONG WITH RELATIVELY SLOW MOVEMENT COULD RESULT IN HEAVY RAINS. WITH MULTITUDE OF BOUNDARIES AND A COUPLE CONVECTIVE SYSTEMS COMPLICATING THE PICTURE... THE FORECAST OF THE DISTRIBUTION OF TSTMS THIS AFTERNOON AND TONIGHT IS DIFFICULT. AT THIS TIME... BELIEVE WILL SEE MCS MOVE ACROSS KS AND NORTHERN OKLAHOMA THROUGH MIDDAY. AFTERNOON DEVELOPMENT WILL LIKELY OCCUR ALONG BOUNDARIES THAT REMAIN FROM EARLIER TSTMS COMPLEXES. THE PRIMARY BOUNDARIES ARE EXPECTED TO STRETCH FROM NORTHWEST OKLAHOMA... THROUGH WEST CENTRAL OKLAHOMA... AND INTO THE SOUTHEAST. COULD ALSO SEE ANOTHER HIGH PLAINS MCS DEVELOP TONIGHT WITH SUPPORT FROM UPSLOPE LOW LEVEL FLOW AND H850 WARM ADVECTION. THIS SYSTEM WOULD THEN MOVE SOUTHEAST INTO NORTHERN OKLAHOMA. WILL CONTINUE A CHANCE OF TSTMS THROUGH SUNDAY AS A WEAK FRONT SAGS SOUTH ACROSS THE AREA. ATTM... MONDAY LOOKS TO BE DRY. HIGH TEMPS TODAY WILL BE TRICKY... THE SOUTHWEST WILL LIKELY HEAT UP TO 100+ WHILE FAR NORTH CENTRAL SECTIONS COULD STAY IN THE UPPER 80S IF CLOUDS/PCPN HANG AROUND LONG ENOUGH TODAY. WILL COOL CENTRAL AND SOUTHERN SECTIONS SLIGHTLY ON SUNDAY WITH THE WEAK FRONT AND CLOUDS/SCTD PCPN IN THE AREA. IN THE LONGER TERM... WILL MAINTAIN LOW POPS WEDS/THURS FOR POSSIBILITY OF NORTHWEST FLOW TSTMS. FCSTID = 32 OKC 93 72 91 69 / 50 40 30 20 HBR 100 72 93 69 / 20 30 30 20 SPS 102 76 99 72 / 10 20 30 30 GAG 94 65 89 65 / 40 40 20 20 PNC 89 67 89 68 / 70 50 20 20 DUA 96 73 96 71 / 20 30 30 30 .OUN... OK...NONE. TX...NONE.
In the hours before
Local storm report, Aug 24, 4:50 AM CDT, 49 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
450 AM CDT SAT AUG 24 2002
TIME (CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1030 PM OKARCHE OK 58 MPH WIND GUST
08/23/02 KINGFISHER
CJSThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 7:10 PM CDT | Severe Thunderstorm Warning | OUN | Woods, Woodward | 50 min |
| Aug 23, 10:55 PM CDT | Severe Thunderstorm Warning | OUN | Noble | 50 min |
| Aug 23, 11:17 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 28 min |
| Aug 23, 11:34 PM CDT | Severe Thunderstorm Warning | OUN | Garfield, Noble | 41 min |
| Aug 24, 12:37 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 38 min |
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.