Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 463, NWS Norman, OK

June 12, 2009Clay County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jun 12, 2009, 7:22 PM CDT for Clay County, Texas. It was in force for 27 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 12, 2009, 7:22 PM CDT (00:22 UTC)
Expired: Jun 12, 2009, 7:49 PM CDT
In force: 27 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Clay County, TX

The radar

The Altus AFB radar (KFDR), 95 km from the middle of the area, began a volume at 00:23 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 12, 3:29 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 0.4 hours before the alert went out and 136 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: 3698 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1518 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 13.8

Open this sounding in Storm Lab

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 Jun 12, 2:39 PM CDT, 4 hours 43 minutes earlier.

Area forecast discussion, Jun 12, 2:39 PM CDT, 4 hours 43 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
239 PM CDT FRI JUN 12 2009

.DISCUSSION...
LARGE COMPLEX OF STORMS MOVED ACROSS PORTIONS OF NORTHERN AND
EASTERN OK EARLIER TODAY AND HAS LEFT SEVERAL RESIDUAL BOUNDARIES
BEHIND ACROSS THE AREA. DRYLINE ALSO TAKING SHAPE NEAR OUR WESTERN
NORTH TEXAS ZONES AND POINTS SOUTH. THESE MAY ALL ACT A FOCI FOR TSTM
DEVELOPMENT LATER TODAY... ALTHOUGH MIDDAY SOUNDING SHOWED
SUBSTANTIAL CAP REMAINS IN PLACE. IF STORMS DO DEVELOP THEY WOULD
LIKELY BECOME SEVERE AS SUBSTANTIAL CAPE EXISTS IF ABLE TO BE
TAPPED. WILL ALSO NEED TO MONITOR EASTERN COLORADO FOR ANOTHER
COMPLEX OF STORMS TO BECOME ORGANIZED... WHICH WOULD THEN MAKE A RUN
AT NORTHERN OK LATE TONIGHT AND SAT MORNING... ALTHOUGH THIS APPEARS
A LITTLE LESS LIKELY THAN LAST NIGHT.

WILL CONT TO HAVE TO MONITOR MAIN SYNOPTIC BOUNDARY THROUGH THE
UPCOMING WEEKEND INTO THE FIRST PART OF NEXT WEEK AS IT WILL REMOVE
ACROSS THE AREA. ALTHOUGH OTHER CONVECTIVE BOUNDARIES MAY PLAY MORE
PROMINENT ROLE ON DAY-TO-DAY BASIS. WILL KEEP SOME HIGHER POPS GOING
THROUGH THE WEEKEND BEFORE ATTEMPTING TO DRY THINGS OUT AND HEAT
THINGS UP NEXT WEEK AS UPPER RIDGE BUILDS INTO THE PLAINS.
HOWEVER... LATEST GFS RETROGRADES THE RIDGE WEST INTO THE
INTERMOUNTAIN WEST AS LARGER SCALE TROUGH DEVELOP ACROSS EASTERN
HALF OF COUNTRY. THIS WOULD AID IN DEVELOPING NORTHWEST FLOW OVER
THE AREA AND A RETURN TO MORE ACTIVE WEATHER BY FOLLOWING WEEKEND
WITH POTENTIAL FOR MAINLY NOCTURNAL MCS AFFECTING AREA.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  69  92  69  91 /  30  20  40  40
HOBART OK         69  94  70  95 /  20  20  40  30
WICHITA FALLS TX  72  96  74  95 /  30  20  50  30
GAGE OK           62  87  65  92 /  20  20  30  30
PONCA CITY OK     65  87  66  87 /  20  20  30  30
DURANT OK         75  94  74  93 /  30  20  40  30

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

26/30

Hazardous weather outlook, Jun 12, 11:13 AM CDT, 8 hours 9 minutes before

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In the hours before

Special weather statement, Jun 12, 5:34 PM CDT, 1 hour 48 minutes before

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Special weather statement, Jun 12, 7:00 PM CDT, 22 minutes before

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Special weather statement, Jun 12, 7:07 PM CDT, 15 minutes before

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Local storm report, Jun 12, 7:11 PM CDT, 11 minutes before

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Special weather statement, Jun 12, 7:17 PM CDT, 5 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 7:15 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	45 min
Jun 12, 7:57 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love	48 min
Jun 12, 8:42 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	35 min
Jun 12, 10:05 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Oklahoma, Pottawatomie	40 min
Jun 12, 10:09 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland	66 min
Jun 12, 10:24 PM CDT	Tornado Warning	OUN	Cleveland, McClain, Pottawatomie	51 min
Jun 12, 10:45 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole	60 min
Jun 12, 11:16 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Pottawatomie	59 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Every severe thunderstorm warning in 2009

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; radar from the NEXRAD Level II archive.