Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 391, NWS Tulsa, OK

June 30, 1999Muskogee County, Okmulgee County, Wagoner County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jun 30, 1999, 5:05 AM CDT for Muskogee County, Okmulgee County, Wagoner 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: Jun 30, 1999, 5:05 AM CDT (10:05 UTC)
Expired: Jun 30, 1999, 5:45 AM CDT
In force: 40 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Muskogee County, OK, Okmulgee County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 48 km from the middle of the area, began a volume at 10:08 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
Jun 30, 5:25 AM CDT	Thunderstorm Wind	Coweta, OK	Several trees were blown down in Coweta.
Jun 30, 5:45 AM CDT	Thunderstorm Wind	Bald Hill, OK	Shingles were blown off several roofs near Bald Hill.

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, 10.1 hours before the alert went out and 171 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: 567 J/kg
Mixed-layer CIN: -317 J/kg
Mixed-layer LCL: 1460 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 254 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 29, 9:18 PM CDT, 7 hours 47 minutes earlier.

Area forecast discussion, Jun 29, 9:18 PM CDT, 7 hours 47 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
918 PM CDT TUE JUN 29 1999

LOW / MID-LEVEL WARM AIR ADVECTION AND MID LEVEL MOISTURE HAVE COMBINED
TO PRODUCE A FEW SHOWERS AND THUNDERSTORMS ALONG THE KANSAS BORDER
OF NE OKLAHOMA.  THIS ACTIVITY WILL PERSIST FOR A FEW HOURS BUT
OVERALL TRENDS IN THE MODEL FIELDS SUGGEST ACTIVITY WILL NOT TAKE
OFF INTO ANYTHING SIGNIFICANT AND MAY DISSIPATE AFTER MIDNIGHT AS
THE ADVECTION PATTERN WEAKENS SOME WITH TIME.

CURRENT ACTIVITY IN THE TEXAS PANHANDLE SHOULD CONTINUE TO DROP
SOUTH AND SOUTHEAST ALONG THE LOW-LEVEL THETA-E AXIS AND FURTHER
INTO THE LOW-LEVEL JET.  IF THIS OCCURS THIS WILL LIKELY DISRUPT THE
LOW-LEVEL JET FUTHER NORTH AND BE A NEGATIVE FACTOR FOR EXCESSIVE
RAINS IN OUR FORECAST AREA.

OF MOST CONCERN IS ACTIVITY NOW RAPIDLY DEVELOPING IN SOUTHWEST
KANSAS.  AT THIS TIME IT APPEARS THAT THESE STORMS WILL BEGIN TO
ACCELERATE SOUTHEAST IN THE MODERATE MID-LEVEL FLOW AND THESE STORMS
WILL HAVE THE POTENTIAL TO PRODUCE DAMAGING WINDS AS THEY APPROACH
OUR FORECAST AREA AFTER 06Z GIVEN THE CURRENT LAPSE RATES AND
VERTICAL SHEAR PROFILE.  THE SPEED OF MOVEMENT SUGGESTS A LESSER THREAT FOR
HEAVY RAINS...BUT THIS IS AT LEAST PARTLY DEPENDANT THAT THE
DEVELOPING MCS IN NW TEXAS / SW OKLAHOMA INHIBITS THE LOW-LEVEL FEED
INTO THESE STORMS AND THAT THEIR MOVEMENT ISNT OVERLY INFLUENCED
RAPID DEVELOPMENT ON THEIR FLANK.

WILL UPDATE ZONES BEFORE 10PM TO TWEAK WORDING AND RAIN CHANCES...BUT
AT THIS TIME DO NOT PLAN A FLASH FLOOD WATCH AND WILL ONLY MAKE
MINOR CHANGES TO THE CURRENT FORECAST.

WILL LOWER POPS A LITTLE IN PARTS OF FAR SOUTHEAST OKLAHOMA PER SHV
FORECAST DISCUSSION.

/8

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

In the hours before

Local storm report, Jun 30, 4:20 AM CDT, 45 minutes before

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

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

0415 AM    MANNFORD                  OK    60 MPH TSTM GUST
06/29/99   CREEK                           SKYWARN SPOTTER
                                           REPORTED 60 MPH TSTM GUST

DRM

Local storm report, Jun 30, 4:20 AM CDT, 45 minutes before

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

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

0415 AM    MANNFORD                  OK    60 MPH TSTM GUST
06/29/99   CREEK                           SKYWARN SPOTTER
                                           REPORTED 60 MPH TSTM GUST

DRM

Local storm report, Jun 30, 4:22 AM CDT, 43 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, 43 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, 40 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, 40 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

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, 5:20 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, 7:34 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, LeFlore, Sequoyah	41 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.