Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 109, NWS Tulsa, OK

April 15, 1998LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 15, 1998, 8:20 PM CDT for LeFlore County, Oklahoma. It was in force for 40 min. 2 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, 1998, 8:20 PM CDT (01:20 UTC)
Expired: Apr 15, 1998, 9:00 PM CDT
In force: 40 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County LeFlore County, OK

What was reported inside it

Time	Report	Where	Remark
Apr 15, 8:33 PM CDT	Hail 0.88	Panama, OK
Apr 15, 9:01 PM CDT	Hail 0.88	Pocola, 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
Apr 15, 6:15 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 1.3 hours before the alert went out and 237 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 576 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 731 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.8

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 15, 3:45 PM CDT, 4 hours 35 minutes earlier.

Area forecast discussion, Apr 15, 3:45 PM CDT, 4 hours 35 minutes before

FPUS3 KTUL 152049
AFDTUL

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
345 PM CDT WED APR 15 1998

WK FRONT HAS STALLED JUST TO E AND S OF TUL THIS AFTN. SHRS AND ISLD
TSTMS HV DEVELOPED MAINLY SOUTH OF THE BOUNDARY AND THEY WERE MOVG
RAPIDLY NE. WINDS OVER SE OK AND WC AR HV BACKED A LTL DURING THE
AFTN AND AS WAVE DEVELOPS AND MOVS ALG FRONT THIS EVENING MAY STILL
SEE A FEW STG/SVR STORMS IN THIS AREA. NGM AND AVN BOTH SHOW VERY
HIGH POPS TONIGHT OVER NRN SECTIONS OF FA. WL MAINTAIN CHC POPS NR
THE FRONT TONIGHT AND WL ALSO LKLY INCLUDE POPS FOR NRN SECTIONS BUT
NOT THE 70-80 POPS MOS IS INDICATING.

MODELS IN FAIRLY GOOD AGREEMENT WITH MAIN FEATURES AND HV GENERALLY
FOLLOWED THE ETA/AVN SOLUTION. AREA TO RMN IN SWLY FLOW WITH IMPULSES
EJECTING OUT THRU THURSDAY. ETA KEEPS MOST PRECIP N OF FA DURING DAY
ON THURSDAY BUT WL INCLUDE SLGT CHC POPS MOST AREAS. WITH CYCLONIC
FLOW CLDS WL PROBABLY BE SLOW TO CLR...BUT SHUD DECREASE DURING THE
DAY ON FRIDAY.

FWC AND FAN TEMPS FAIRLY CLOSE AND GENERALLY IN LINE WITH GOING FCST
PACKAGE - THUS WL STICK WITH AVN/NGM BLEND.

SMITH

PRELIMINARY NUMBERS SUBJECT TO LAST MINUTE CHANGES
TUL   53  58  40  63 /  30  20   0   0
FSM   54  65  44  64 /  40  20   0   0
MLC   55  64  43  62 /  40  20   0   0
BVO   49  54  40  61 /  30  20   0   0
FYV   52  59  40  60 /  40  20   0   0
IDB   56  68  46  64 /  40  20   0   0
BYV   52  58  40  58 /  40  20   0   0
MIO   52  56  42  60 /  40  20   0   0
MKO   53  58  43  62 /  30  20   0   0
F10   53  58  43  62 /  30  20   0   0
HHW   56  68  46  64 /  40  20   0   0

.TUL...
OK...NONE.
AR...NONE.

In the hours before

Local storm report, Apr 15, 8:10 PM CDT, 10 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
808 PM CST WED APR 15 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0630 PM    SPRINGDALE         (       AR   0.75 INCH HAIL
04/15/98   WASHINGTON

0715 PM    FANSHAWE                  OK   0.75 INCH HAIL
04/15/98   LEFLORE

Local storm report, Apr 15, 8:17 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
817 PM CDT WED APR 15 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0750 PM    CHARLESTON                AR   .75 INCH HAIL
04/15/98   FRANKLIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 7:01 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore	59 min
Apr 15, 7:40 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	50 min
Apr 15, 8:45 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Pushmataha	60 min
Apr 15, 11:18 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw	42 min
Apr 15, 11:55 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw	35 min
Apr 16, 2:30 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh	45 min
Apr 16, 2:39 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Pushmataha	36 min
Apr 16, 2:52 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Muskogee	38 min
Apr 16, 3:06 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Haskell, Sequoyah	54 min
Apr 16, 4:34 AM CDT	Severe Thunderstorm Warning	TSA	Latimer	56 min
Apr 16, 4:52 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore	38 min
Apr 16, 4:58 AM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	47 min
Apr 16, 5:28 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore	47 min
Apr 15, 7:04 PM CDT	Severe Thunderstorm Warning	TSA	Sebastian	56 min
Apr 15, 7:10 PM CDT	Severe Thunderstorm Warning	TSA	Franklin	65 min
Apr 15, 8:40 PM CDT	Severe Thunderstorm Warning	TSA	Sebastian	50 min
Apr 16, 3:27 AM CDT	Severe Thunderstorm Warning	TSA	Crawford, Washington	63 min
Apr 16, 3:59 AM CDT	Severe Thunderstorm Warning	TSA	Franklin, Madison	61 min
Apr 16, 4:30 AM CDT	Severe Thunderstorm Warning	TSA	Crawford, Franklin	45 min
Apr 16, 5:53 AM CDT	Severe Thunderstorm Warning	TSA	Sebastian	37 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998 Every severe thunderstorm warning in 1998

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.