Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 370, NWS Tulsa, OK

June 7, 1999Okmulgee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jun 7, 1999, 9:11 PM CDT for Okmulgee County, Oklahoma. It was in force for 49 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: Jun 7, 1999, 9:11 PM CDT (02:11 UTC)
Expired: Jun 7, 1999, 10:00 PM CDT
In force: 49 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Okmulgee County, OK

The radar

The Tulsa radar (KINX), 69 km from the middle of the area, began a volume at 02:10 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
Jun 7, 9:45 PM CDT	Hail 1	Beggs, OK
Jun 7, 9:45 PM CDT	Thunderstorm Wind 57	Beggs, OK
Jun 7, 10:03 PM CDT	Hail 1	Preston, 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, 2.2 hours before the alert went out and 138 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: 404 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1904 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 7, 3:30 PM CDT, 5 hours 41 minutes earlier.

Area forecast discussion, Jun 7, 3:30 PM CDT, 5 hours 41 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
330 PM CDT MON JUN 7 1999

PROBLEM(S) OF THE DAY:
POPS
TEMPERATURES

UNSTABLE/WEAKLY CAPPED ATMOSPHERE HAS RESULTED IN ISOLATED TO WIDELY
SCATTERED TSRA THIS AFTERNOON OVER NORTHEAST OKLAHOMA. WITH THE
EXCEPTION OF MINOR PLACEMENT DISCREPENCIES...MODELS IN GENERAL
AGREEMENT WITH SYNOPTIC SCALE FEATURES. LOOKS LIKE CURRENT PATTERN
WILL HOLD AT LEAST THROUGH THIS FORECAST CYCLE. LEE TROUGHING WILL
KEEP RETURN FLOW OVER ALL OF FA. MID LEVEL SHEAR AXIS MENADERS AROUND
REGION AS WELL. WITH WEAKLY CAPPED ENVIRONMENT ALREADY IN PLACE AND A
HINT OF UPPER SUPPORT...WILL GO AHEAD WITH SLIGHT CHANCE POPS ALL
PERIODS. WITH NO REAL SURFACE BOUNDARIES OR UPPER SUPPORT TO SUSTAIN
ORGANIZED CONVECTION...STORMS WILL LIKELY DIE OUT AS HEATING OF DAY
IS LOST. WILL GO AHEAD AND CONFINE POPS TO AFTERNOON AND EVENING
WORDING. FAN/FWC NUMBERS LOOK GOOD SO WILL STICK CLOSE TO THEM.

IN THE EXTENDED...CURRENT PATTERN LOOKS TO HANG ON THROUGH EXTENDED
PERIOD. LATE IN THE WEEK MID LEVEL SHEAR AXIS MOVES EAST AND H7 TEMPS
LOOK TO WARM SLIGHTLY. WILL KEEP SLIGHT CHANCE POPS THROUGH FRIDAY
BUT LEAVE SATURDAY DRY WITH WARMER MID LEVEL TEMPS AND SHEAR AXIS
EAST OF THE AREA.

FCSTID = 23

TUL   72  90  72  91 /  20  20  20  20
FSM   71  91  71  91 /  20  20  20  20
MLC   71  91  72  91 /  20  20  20  20
BVO   69  90  70  90 /  20  20  20  20
FYV   69  88  69  89 /  20  20  20  20
IDB   70  91  71  91 /  20  20  20  20
BYV   68  88  69  89 /  20  20  20  20
MIO   68  88  69  89 /  20  20  20  20
MKO   72  90  72  91 /  20  20  20  20
F10   72  90  72  91 /  20  20  20  20
HHW   70  91  71  91 /  20  20  20  20

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

--------------------
EXPERIMENTAL OUTPUT:

HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS:  NONE
NGM CONFIDENCE:  7 ON A SCALE OF 0 TO 10
ETA CONFIDENCE:  7 ON A SCALE OF 0 TO 10
AVN CONFIDENCE:  7 ON A SCALE OF 0 TO 10
FCST CONFIDENCE: 7 ON A SCALE OF 0 TO 10

In the hours before

Local storm report, Jun 7, 5:08 PM CDT, 4 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
508 PM CDT MON JUN 07 1999

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

0415 PM    PAWHUSKA                  OK    .88 INCH HAIL
06/07/99   OSAGE

0433 PM    COLLINSVILLE              OK    .75 INCH HAIL
06/07/99   TULSA                           COLLINSVILLE PD

0440 PM    VERA                      OK    .75 INCH HAIL
06/07/99   WASHINGTON

Local storm report, Jun 7, 5:08 PM CDT, 4 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
508 PM CDT MON JUN 07 1999

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

0415 PM    PAWHUSKA                  OK    .88 INCH HAIL
06/07/99   OSAGE

0433 PM    COLLINSVILLE              OK    .75 INCH HAIL
06/07/99   TULSA                           COLLINSVILLE PD

0440 PM    VERA                      OK    .75 INCH HAIL
06/07/99   WASHINGTON

Local storm report, Jun 7, 6:15 PM CDT, 2 hours 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
615 PM CDT MON JUN 07 1999

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

0555 PM    CLEVELAND                 OK    WIND DAMAGE
06/07/99   PAWNEE                          SEVERAL LARGE TREE
                                           LIMBS DOWN (P.D.)

Local storm report, Jun 7, 6:15 PM CDT, 2 hours 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
615 PM CDT MON JUN 07 1999

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

0555 PM    CLEVELAND                 OK    WIND DAMAGE
06/07/99   PAWNEE                          SEVERAL LARGE TREE
                                           LIMBS DOWN (P.D.)

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 7:19 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	41 min
Jun 7, 7:39 PM CDT	Severe Thunderstorm Warning	TSA	Wagoner	36 min
Jun 7, 8:13 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Wagoner	32 min
Jun 7, 8:42 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee	48 min
Jun 7, 9:59 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	46 min

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.