Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 36, NWS Norman, OK

March 29, 1997Garvin County, McClain County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 29, 1997, 9:30 PM CST for Garvin County, McClain County, Oklahoma. It was in force for 45 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
Mar 29, 1997, 9:30 PM CST (03:30 UTC)
Expired
Mar 29, 1997, 10:15 PM CST
In force
45 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Garvin County, OK, McClain County, OK

The radar

The Norman radar (KTLX), 54 km from the middle of the area, began a volume at 03:34 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

TimeReportWhereRemark
Mar 29, 10:00 PM CSTHail 0.88Stratford, 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, 3.5 hours before the alert went out and 40 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.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 1997-03-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 132 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 1997-03-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
132 J/kg
Mixed-layer CIN
-180 J/kg
Mixed-layer LCL
2545 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
291 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

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 Mar 29, 2:51 PM CST, 6 hours 39 minutes earlier.

Area forecast discussion, Mar 29, 2:51 PM CST, 6 hours 39 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
250 PM CST SAT MAR 29 1997

CDFNT IS MAKING SLOWER PROGRESS THAN PREV THOUGHT. THIS WL ALLOW A LTL
MORE MSTR TO GET TO RED RVR. WL CONT MENTN OF TSTMS CNTL AND S TNGT...
BUT WL BUMP UP POPS A BIT. A FEW SPRINKLES WITH POPS BLO 20 IN THE N.
STLT LOOPS SHOW LOW CLDS INCRSG OVR KS BEHIND FNT...AND MDL LO LVL MSTR
FLDS FCST A FEW HRS OF LOW CLDS AFT FROPA. WNDS WL ALSO BE QUITE STG
BEHIND FNT FOR A FEW HRS.

SLGT RISK SVR STILL LUKS GOOD DOWN SOUTH AS 12Z UA CHARTS SHOW MDTLY
STEEP LAPSE RATES WHICH WL STEEPEN MORE WITH APCH OF COLD TEMPS ALF AND
HTG FM SUNSHINE. WITH CDFNT SLOWING DOWN AND WMFNT NOW PUSHING N OF RED
RVR...SLGT RISK WAS PULLED A LTL FURTHER N INTO SRN OK IN THE 18Z TSTM
OUTLK.

HI PRES BLDS INTO AREA ON SUN WITH ALL MDLS INDCTG DEEP DRYING AND
SUBSIDENCE. PRES GRAD RELAXES QUITE A BIT IN THE W SUN AFTN...WITH LGT
AND VRBL WNDS OVR ENTIRE FA SUN NGT. WITH DRY AIR AND CLR SKIES...FVBL
RADIATIONAL COOLING CONDS WL SET UP. WL GO AT OR BLO GUID TEMPS SUN NGT.
WITH PLENTY OF SUNSHINE ON SUN...HWVR...WL TREND MORE TWD THE WARMER FWC
TEMPS.

NGM AND ETA SHOWS MSTR GETTING SHOVED PRETTY FAR S INTO TX. ALTHOUGH
WNDS WL BE RECOVERING ON MON WITH LEE TROF SETTING UP...BLV THAT AVN IS
TOO AGRESSIVE WITH BRINGING BACK THE MSTR. ANY PCPN THAT DVLPS SHUD BE
FAR TO OUR W VCNTY LEE TROF...AND W OF H5 SHTWV RDG. AND THAT'S ASSUMING
ANY MSTR CAN MAKE IT BACK THERE...WHICH IS QUESTIONABLE. WL THEREFORE GO
WITH FWC TEMPS ON MON...WHICH IS 10 TO 15 DEG WARMER THAN FAN.

SRN PLNS WL BE RETURNING TO SWLY FLO ALF ON TUE WITH SLY WNDS STARTING
TO BRING UP THE MSTR. WL KEEP CNVCTV-TYPE CHC POPS FOR TUE AND WED...AND
IN THE S OF THU. TEMPS WL BE ON THE COOLING TREND THRU THE EXTDD PD WITH
CLDS AND PCPN AROUND...AND NEW SURGE OF HI PRES COMING IN LT WED AND
THU.  ..04..

GAG 34/68/30/72 1001    PNC 38/64/32/70 1001    HBR 36/70/32/71 1001
SPS 42/69/37/72 3101    OKC 39/65/34/69 2001    DUA 48/65/40/71 4101

.OKC...
OK...NONE.
TX...NONE.

In the hours before

Special weather statement, Mar 29, 7:47 PM CST, 1 hour 43 minutes before
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Special weather statement, Mar 29, 7:50 PM CST, 1 hour 40 minutes before
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Local storm report, Mar 29, 9:10 PM CST, 20 minutes before
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Local storm report, Mar 29, 9:10 PM CST, 20 minutes before
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Local storm report, Mar 29, 9:27 PM CST, 3 minutes before
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Local storm report, Mar 29, 9:28 PM CST, 2 minutes before
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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 29, 8:30 PM CSTSevere Thunderstorm WarningOUNLincoln, Payne45 min
Mar 29, 9:30 PM CSTSevere Thunderstorm WarningOUNPontotoc, Pottawatomie, Seminole45 min
Mar 29, 9:55 PM CSTSevere Thunderstorm WarningOUNHughes50 min
Mar 29, 10:13 PM CSTSevere Thunderstorm WarningOUNPontotoc, Seminole47 min
Mar 29, 10:43 PM CSTSevere Thunderstorm WarningOUNCoal, Hughes32 min
Mar 29, 8:28 PM CSTSevere Thunderstorm WarningOUNClay47 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.