Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 142, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at May 25, 1997, 6:31 PM CDT for McClain County, Pontotoc County, Oklahoma. It was in force for 59 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
- May 25, 1997, 6:31 PM CDT (23:31 UTC)
- Expired
- May 25, 1997, 7:30 PM CDT
- In force
- 59 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties McClain County, OK, Pontotoc County, OK
The radar
The Norman radar (KTLX), 55 km from the middle of the area, began a volume at 23:30 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 |
|---|---|---|---|
| May 25, 7:30 PM CDT | Hail 1 | Roff, OK | |
| May 25, 7:34 PM CDT | Hail 1 | Roff, OK | |
| May 25, 7:37 PM CDT | Hail 1.75 | Roff, 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 |
|---|---|---|---|
| May 25, 3:00 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 11.5 hours before the alert went out and 50 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
- 491 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 928 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 25, 3:32 PM CDT, 2 hours 59 minutes earlier.
Area forecast discussion, May 25, 3:32 PM CDT, 2 hours 59 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 330 PM CDT SUN MAY 25 1997 SCT STG TSTMS ARE NOW BGNG TO DVLP IN WRN OK. XPCT THE STMS TO INCR SIGLY IN CVRG OVR THE NEXT CPL HOURS. AS A RSLT...HAVE GONE WITH HI POPS XCPT IN FAR NW OK WHERE DRIER AIR HAS ARRIVED. WL MNTN CHC SVR OVR MOST OF THE FA DUE TO HIGHLY FVRBL CONDS FOR SVR WX. ONCE THE STMS EXIT THE FA...PROB LATE THIS EVE...THE NEXT BIG QUESTION IS WHETHER THERE WL BE ENUF MSTR ARND TMRW TO SUPPORT CNVCTN. INSTAB AND PROXIMITY OF SFC BNDRYS AND UPR LOW ALL SEEM TO SUGGEST THE PSBLTY OF SCT TSTMS AGN TMRW...BUT THE AMT OF MSTR FCST APPEARS TOO LOW FOR MUCH TO DVLP. SO HAVE OPTED FOR LOW POPS...MNLY CLOSE TO THE FOCUSING MECHANISMS. ETA BRNGS A SIG COOL DOWN INTO THE NWRN ZNS ON TUE. SITN APPEARS TO BE THE TYPE WHERE COOL TEMPS WOULD BE ACCOMPANIED BY LOW CLDS AND GUSTY N WNDS. IF THAT IS IN FACT WHAT HAPPENS...THE MAX TEMPS IN THAT AREA COULD EASILY BE BLO 60 DEG. AM NOT YET THAT CONFIDENT OF SUCH A SIG DEPARTURE FM NRML...BUT WL STILL GO BLO FWC BY ABT 5 DEG. AGN ELECTED TO GENERALLY FOLLOW NCEP GDNC RATHER THAN MRF FOR EXTDD. FCSTID = 23 = CMS OKC 63 87 60 84 / 60 20 10 20 HBR 60 88 58 79 / 40 20 10 10 SPS 67 90 60 82 / 40 0 0 10 GAG 55 84 55 70 / 10 20 20 20 PNC 65 86 58 78 / 50 30 30 30 DUA 68 92 67 86 / 50 20 0 10 .OKC... OK...NONE. TX...NONE.
In the hours before
Local storm report, May 25, 4:21 PM CDT, 2 hours 10 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0415 PM CDT SUN MAY 25 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0352 PM 1 W AMBER OK 1.00 INCH HAIL
05/25/97 GRADY
0412 PM 2.5 E MIDDLEBURG OK 1.00 INCH HAIL
05/25/97 GRADY
0414 PM MIDDLEBURG OK TORNADO
05/25/97 GRADY
JLocal storm report, May 25, 4:40 PM CDT, 1 hour 51 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0440 PM CDT SUN MAY 25 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
415 PM 2.5 E MIDDLEBURG OK 2.50 INCH HAIL
05/25/97 GRADY
0417 PM 2.5 N TABLER OK WIND DAMAGE
05/25/97 GRADY ROOF OFF MOBILE HOME
0425 PM 1 N BLANCHARD OK 1.00 HAIL
05/25/97 MCCLAIN
JThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 8:58 PM CDT | Severe Thunderstorm Warning | OUN | Beckham | 47 min |
| May 24, 9:35 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Roger Mills | 40 min |
| May 24, 9:56 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Roger Mills | 49 min |
| May 24, 10:14 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Dewey | 46 min |
| May 24, 11:00 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Custer | 45 min |
| May 24, 11:45 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Custer | 45 min |
| May 24, 11:54 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Washita | 51 min |
| May 25, 1:29 AM CDT | Severe Thunderstorm Warning | OUN | Canadian, Grady | 46 min |
| May 25, 2:36 AM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain | 39 min |
| May 25, 4:45 AM CDT | Severe Thunderstorm Warning | OUN | Garvin, Grady, McClain | 45 min |
| May 25, 7:25 AM CDT | Severe Thunderstorm Warning | OUN | Coal, Hughes, Pontotoc | 35 min |
| May 25, 8:42 AM CDT | Severe Thunderstorm Warning | OUN | Atoka, Pushmataha | 48 min |
| May 25, 3:38 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 52 min |
| May 25, 4:00 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain | 60 min |
| May 25, 4:03 PM CDT | Tornado Warning | OUN | Grady, McClain | 42 min |
| May 25, 4:40 PM CDT | Tornado Warning | OUN | Cleveland, McClain | 65 min |
| May 25, 4:44 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche | 46 min |
| May 25, 5:03 PM CDT | Tornado Warning | OUN | Caddo, Comanche | 42 min |
| May 25, 5:30 PM CDT | Severe Thunderstorm Warning | OUN | Cotton, Garvin, Stephens | 60 min |
| May 25, 5:37 PM CDT | Tornado Warning | OUN | Cleveland, McClain, Pottawatomie | 53 min |
| May 25, 5:40 PM CDT | Tornado Warning | OUN | Grady | 35 min |
| May 25, 6:04 PM CDT | Tornado Warning | OUN | Stephens | 41 min |
| May 25, 6:07 PM CDT | Tornado Warning | OUN | Garvin | 68 min |
| May 25, 6:15 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 30 min |
| May 25, 6:41 PM CDT | Tornado Warning | OUN | Murray | 34 min |
| May 25, 6:45 PM CDT | Tornado Warning | OUN | Stephens | 45 min |
| May 25, 6:51 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 24 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1997Every severe thunderstorm warning in 1997
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.