Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 394, NWS Tulsa, OK

June 30, 1999Haskell County, LeFlore County, Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jun 30, 1999, 7:34 AM CDT for Haskell County, LeFlore County, Sequoyah County, Oklahoma. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 30, 1999, 7:34 AM CDT (12:34 UTC)
Expired: Jun 30, 1999, 8:15 AM CDT
In force: 41 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Haskell County, OK, LeFlore County, OK, Sequoyah County, OK

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 0.6 hours before the alert went out and 211 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: 126 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 255 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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 30, 5:10 AM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, Jun 30, 5:10 AM CDT, 2 hours 24 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
510 AM CDT WED JUN 30 1999

BUSY ALL NIGHT WITH ONGOING WEATHER SO NOT A LOT OF TIME TO LOOK AT
THINGS OR TO WRITE A DISCUSSION.

WAS GOING TO ISSUE A FLASH FLOOD WATCH FOR TODAY AND POSSIBLY TONIGHT
IN NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS BUT CURRENT CONVECTION
NOW MAKING DECENT PROGRESS TO THE SOUTH SO DECIDED TO HOLD OFF FOR
NOW. WILL WAIT TO SEE HOW THINGS EVOLVE THE NEXT FEW HOURS BUT MAY
YET NEED A WATCH SOMEWHERE...THE BIG QUESTION IS JUST WHERE.

SEVERAL MESOSCALE CONVECTIVE COMPLEXES WILL LIKELY AFFECT THE AREA
DURING THE NEXT 24 TO 36 HOURS BEFORE MID LEVEL WARMING CAPS THINGS
OFF. WENT WAY ABOVE GUIDANCE POPS AND COOLER THAN GUIDANCE ON
TEMPERATURES ALTHOUGH DO EXPECT SOME WARMUP THURSDAY WITH MORE
SUNSHINE RETURNING BY AFTERNOON.

HAD NO TIME TO LOOK AT EXTENDED SO LITTLE OR NO CHANGES MADE THERE.

THANKS TO CHUCK IN SPRINGFIELD AND GREG IN LITTLE ROCK FOR
COORDINATION.

FCSTID = 5
TUL   80  70  87  72 /  80  70  50  40
FSM   82  72  90  73 /  70  40  30  20
MLC   82  73  90  74 /  70  40  30  20
BVO   80  70  87  72 /  70  70  50  40
FYV   80  70  85  70 /  80  70  50  40
IDB   88  72  91  73 /  50  30  20  10
BYV   80  70  85  70 /  80  70  50  40
MIO   80  70  86  71 /  70  70  50  40
MKO   80  72  88  73 /  90  50  40  30
F10   80  72  88  73 /  90  50  40  30
HHW   88  73  91  74 /  50  30  20  10

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

PLATE

In the hours before

Local storm report, Jun 30, 4:22 AM CDT, 3 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
422 AM CDT WED JUN 30 1999

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

0415 AM    2 E SAPULPA               OK    75 MPH TSTM GUST
06/29/99   CREEK

Local storm report, Jun 30, 4:22 AM CDT, 3 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
422 AM CDT WED JUN 30 1999

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

0415 AM    2 E SAPULPA               OK    75 MPH TSTM GUST
06/29/99   CREEK

Local storm report, Jun 30, 4:25 AM CDT, 3 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
425 AM CDT WED JUN 30 1999

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

0415 AM    2 W GLENPOOL              OK    75 MPH TSTM GUST
06/29/99   TULSA

Local storm report, Jun 30, 4:25 AM CDT, 3 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
425 AM CDT WED JUN 30 1999

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

0415 AM    2 W GLENPOOL              OK    75 MPH TSTM GUST
06/29/99   TULSA

Special weather statement, Jun 30, 6:00 AM CDT, 1 hour 34 minutes before

ARZ001-002-010-011-019-020-029-OKZ049-053>076-011100-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
600 AM CDT WED JUN 30 1999

A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN OKLAOMA AND
NORTHWEST ARKANSAS TODAY AND TONIGHT.

.SYNOPSIS...
EARLY THIS MORNING LOW PRESSURE WAS LOCATED OVER THE TEXAS PANHANDLE
WITH A WARM FRONT TO ITS EAST ACROSS CENTRAL OKLAHOMA AND CENTRAL
ARKANSAS.  TODAY AND TONIGHT THE LOW PRESSURE WILL REMAIN OVER THE TEXAS
PANHANDLE AND THE WARM FRONT WILL MOVE SLIGHTLY NORTH TO NEAR THE
KANSAS-OKLAHOMA AND ARKANSAS-MISSOURI BORDERS.

.DISCUSSION...
VERY MOIST AND UNSTABLE AIR WILL RESIDE OVER THE AREA NEAR AND TO THE
SOUTH OF THE WARM FRONT THROUGH TONIGHT.  A FEW ONGOING THUNDERSTORMS
THIS MORNING WILL HAVE THE POTENTIAL TO BE SEVERE AND PRODUCE FLASH
FLOODING.  THESE THUNDERSTORMS WILL GRADUALLY COME TO AN END THIS
MORNING AND SOME BREAKS MAY OCCUR IN THE CLOUD COVER THIS AFTERNOON.
SHOULD THE SUN COME OUT THIS AFTERNOON A FEW THUNDERSTORMS COULD FORM ON
OUTFLOW BOUNDARIES LEFT BEHIND BY THIS MORNINGS STORMS.  A FEW OF THESE
STORMS COULD BRIEFLY BECOME SEVERE.  SHOULD THUNDERSTORMS DEVELOP THIS
AFTERNOON THEY MAY SUBSIDE DURING THE EVENING HOURS.  HOWEVER...IF THEY
DO THE THUNDERSTORM THREAT OF SEVERE WEATHER WILL NOT HAVE ENDED.
THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE EASTERN PLAINS OF
COLORADO AND SOUTHWEST KANSAS LATE THIS AFTERNOON.  THESE STORMS MAY
FORM A COMPLEX OF STORMS WHICH WILL LIKELY MOVE SOUTHEAST AND COULD
AFFECT PARTS OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS LATE TONIGHT.
ONCE AGAIN ENOUGH INSTABILITY AND MOISTURE WILL REMAIN OVER THE AREA FOR
A FEW OF THESE STORMS TO BECOME SEVERE WITH LARGE HAIL AND DAMAGING
WINDS AND ALSO TO PRODUCE HEAVY RAINS WHICH COULD PRODUCE FLASH
FLOODING.

.EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION...
CIVIL DEFENSE AGENCIES AND SPOTTER GROUPS SHOULD MONITOR THE LATEST
STATEMENTS AND FORECASTS CONCERNING THIS POTENTIALLY THREATENING WEATHER
SITUATION.  THEY SHOULD ALSO BE PREPARED FOR POSSIBLE ACTIVATION.

Special weather statement, Jun 30, 6:00 AM CDT, 1 hour 34 minutes before

ARZ001-002-010-011-019-020-029-OKZ049-053>076-011100-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
600 AM CDT WED JUN 30 1999

A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN OKLAOMA AND
NORTHWEST ARKANSAS TODAY AND TONIGHT.

.SYNOPSIS...
EARLY THIS MORNING LOW PRESSURE WAS LOCATED OVER THE TEXAS PANHANDLE
WITH A WARM FRONT TO ITS EAST ACROSS CENTRAL OKLAHOMA AND CENTRAL
ARKANSAS.  TODAY AND TONIGHT THE LOW PRESSURE WILL REMAIN OVER THE TEXAS
PANHANDLE AND THE WARM FRONT WILL MOVE SLIGHTLY NORTH TO NEAR THE
KANSAS-OKLAHOMA AND ARKANSAS-MISSOURI BORDERS.

.DISCUSSION...
VERY MOIST AND UNSTABLE AIR WILL RESIDE OVER THE AREA NEAR AND TO THE
SOUTH OF THE WARM FRONT THROUGH TONIGHT.  A FEW ONGOING THUNDERSTORMS
THIS MORNING WILL HAVE THE POTENTIAL TO BE SEVERE AND PRODUCE FLASH
FLOODING.  THESE THUNDERSTORMS WILL GRADUALLY COME TO AN END THIS
MORNING AND SOME BREAKS MAY OCCUR IN THE CLOUD COVER THIS AFTERNOON.
SHOULD THE SUN COME OUT THIS AFTERNOON A FEW THUNDERSTORMS COULD FORM ON
OUTFLOW BOUNDARIES LEFT BEHIND BY THIS MORNINGS STORMS.  A FEW OF THESE
STORMS COULD BRIEFLY BECOME SEVERE.  SHOULD THUNDERSTORMS DEVELOP THIS
AFTERNOON THEY MAY SUBSIDE DURING THE EVENING HOURS.  HOWEVER...IF THEY
DO THE THUNDERSTORM THREAT OF SEVERE WEATHER WILL NOT HAVE ENDED.
THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE EASTERN PLAINS OF
COLORADO AND SOUTHWEST KANSAS LATE THIS AFTERNOON.  THESE STORMS MAY
FORM A COMPLEX OF STORMS WHICH WILL LIKELY MOVE SOUTHEAST AND COULD
AFFECT PARTS OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS LATE TONIGHT.
ONCE AGAIN ENOUGH INSTABILITY AND MOISTURE WILL REMAIN OVER THE AREA FOR
A FEW OF THESE STORMS TO BECOME SEVERE WITH LARGE HAIL AND DAMAGING
WINDS AND ALSO TO PRODUCE HEAVY RAINS WHICH COULD PRODUCE FLASH
FLOODING.

.EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION...
CIVIL DEFENSE AGENCIES AND SPOTTER GROUPS SHOULD MONITOR THE LATEST
STATEMENTS AND FORECASTS CONCERNING THIS POTENTIALLY THREATENING WEATHER
SITUATION.  THEY SHOULD ALSO BE PREPARED FOR POSSIBLE ACTIVATION.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 3:23 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Tulsa	52 min
Jun 30, 4:10 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee	50 min
Jun 30, 4:37 AM CDT	Severe Thunderstorm Warning	TSA	Tulsa	23 min
Jun 30, 4:45 AM CDT	Flash Flood Warning	TSA	Creek, Okmulgee, Tulsa	2 hr
Jun 30, 5:05 AM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Wagoner	40 min
Jun 30, 5:20 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	25 min
Jun 30, 5:42 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Okfuskee, Okmulgee	48 min
Jun 30, 8:10 AM CDT	Flash Flood Warning	TSA	Haskell, LeFlore	3 hr
Jun 30, 5:41 AM CDT	Flash Flood Warning	TSA	Washington	2 hr
Jun 30, 5:43 AM CDT	Flash Flood Warning	TSA	Benton, Washington	2 hr
Jun 30, 5:57 AM CDT	Flash Flood Warning	TSA	Madison	108 min
Jun 30, 8:10 AM CDT	Flash Flood Warning	TSA	Crawford, Franklin, Sebastian	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1999 Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.