Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 456, NWS Norman, OK

June 20, 2007Archer County, Clay County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jun 20, 2007, 2:59 AM CDT for Archer County, Clay County, Texas. It was in force for 31 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 20, 2007, 2:59 AM CDT (07:59 UTC)
Expired: Jun 20, 2007, 3:30 AM CDT
In force: 31 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

Counties Archer County, TX, Clay County, TX

The radar

The Altus AFB radar (KFDR), 88 km from the middle of the area, began a volume at 08:03 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 19, 11:20 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 8.0 hours before the alert went out and 145 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: 3576 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1390 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 19, 9:59 PM CDT, 5 hours earlier.

Area forecast discussion, Jun 19, 9:59 PM CDT, 5 hours before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
959 PM CDT TUE JUN 19 2007

.DISCUSSION UPDATE...
WE HAVE ADDED A FLASH FLOOD WATCH TO OUR FORECAST FOR TONIGHT...
FOR ALL BUT NORTHERN AND PARTS OF SOUTHERN OKLAHOMA... AND ALSO
EXCLUDING OUR TEXAS COUNTIES. THIS IS DUE TO THE TORRENTIAL RAIN
FALLING IN THE STORM COMPLEXES... COMBINED WITH RECENT RAINFALL.

&&

.PREV DISCUSSION... /ISSUED 926 PM CDT TUE JUN 19 2007/

DISCUSSION...
EXTREME INSTABILITY... COMBINED WITH A WEAK SURFACE BOUNDARY...
HAVE LED TO SEVERAL LARGE STORM CLUSTERS OVER THE NORTHERN HALF
OF OKLAHOMA AND SURROUNDING STATES. VERY WEAK SHEAR HAS RESULTED
IN MAINLY MULTI-CELL DEVELOPMENT. CORFIDI VECTORS SUGGEST THAT
THESE COMPLEXES WILL CONTINUE THEIR SOUTHWARD PROPAGATION
OVERNIGHT... RESULTING IN HIGH CHANCES OF RAIN/THUNDER FOR MOST OF
OUR FORECAST AREA. THE LOWEST CHANCES WILL BE IN THE SOUTHEAST...
WHERE A STRENGTHENING CAP MIGHT IMPEDE THE PROGRESS OF THE STORMS
LATE TONIGHT. ELSEWHERE... VERY HIGH POPS WILL BE IN PLACE FOR
TONIGHT.

WE HAVE ALREADY UPDATED THE FORECAST ONCE TO ADJUST
POPS/WEATHER/QPF TO ACCOUNT FOR THE LATEST TRENDS... AND WILL DO
SO AGAIN MOMENTARILY.

PREV DISCUSSION... /ISSUED 451 PM CDT TUE JUN 19 2007/

DISCUSSION...
EXTREMELY UNSTABLE ATMOSPHERE WILL BE SEEN THIS AFTERNOON INTO THE
EVENING. ALTHOUGH MAIN CONCERN THROUGH THE MID-EVENING HOURS WILL
BE FOR MAINLY ISOLATED OR PERHAPS SCATTERED THUNDERSTORMS...GIVEN
6-7K CAPES...HIGH END SEVERE WEATHER POSSIBLE. WITH RELATIVELY
WEAK WIND SHEAR...MAIN THREAT WILL BE GIANT HAIL AND DAMAGING
WINDS...ALTHOUGH BRIEF TORNADOES CANNOT BE RULED OUT IN THE EARLY
STAGES OF THUNDERSTORM DEVELOPMENT. OUTSIDE OF ANY
ISOLATED/SCATTERED STORMS ACROSS NORTHERN ZONES LATE THIS
AFTERNOON THROUGH THE FIRST HALF OF THE EVENING...BETTER CHANCES
FOR THUNDERSTORMS WILL OCCUR OVERNIGHT WITH POSSIBLE MCS
DEVELOPING TO OUR NORTHWEST AND SURGING SOUTHEAST.

OUTSIDE OF LINGERING SHOWERS/STORMS TOMORROW...FORECAST WILL BE
DRY FROM TOMORROW NIGHT THROUGH DAY SEVEN AS UPPER RIDGING TAKES
HOLD. WITH TEMPERATURES ON THE INCREASE AND LOWER LEVEL MOISTURE
NOT GOING ANYWHERE ANYTIME SOON...WILL NEED TO WATCH FOR HEAT
ADVISORY CONDITIONS MID-LATE WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  72  89  71  93 /  80  30  10  10
HOBART OK         71  92  71  94 /  80  30  10  10
WICHITA FALLS TX  72  92  72  95 /  60  40  10  10
GAGE OK           69  91  69  94 / 100  20  10  10
PONCA CITY OK     71  89  71  93 /  90  30  10  10
DURANT OK         74  90  72  93 /  50  40  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...FLASH FLOOD WATCH UNTIL 6 AM CDT WEDNESDAY FOR OKZ014>031-
     033>035-038.

TX...NONE.
&&

23/11

Hazardous weather outlook, Jun 20, 2:35 AM CDT, 24 minutes before

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In the hours before

Local storm report, Jun 20, 2:19 AM CDT, 40 minutes before

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Special weather statement, Jun 20, 2:20 AM CDT, 39 minutes before

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Local storm report, Jun 20, 2:23 AM CDT, 36 minutes before

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Local storm report, Jun 20, 2:27 AM CDT, 32 minutes before

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Local storm report, Jun 20, 2:37 AM CDT, 22 minutes before

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Local storm report, Jun 20, 2:39 AM CDT, 20 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 19, 7:13 PM CDT	Severe Thunderstorm Warning	OUN	Woods	47 min
Jun 19, 7:16 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	44 min
Jun 19, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	43 min
Jun 19, 7:40 PM CDT	Severe Thunderstorm Warning	OUN	Major	65 min
Jun 19, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	60 min
Jun 19, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	60 min
Jun 19, 8:10 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	50 min
Jun 19, 8:44 PM CDT	Severe Thunderstorm Warning	OUN	Major	46 min
Jun 19, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	50 min
Jun 19, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	65 min
Jun 19, 8:58 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	47 min
Jun 19, 9:00 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	45 min
Jun 19, 9:05 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	40 min
Jun 19, 9:09 PM CDT	Severe Thunderstorm Warning	OUN	Harper	51 min
Jun 19, 9:15 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	45 min
Jun 19, 9:22 PM CDT	Severe Thunderstorm Warning	OUN	Custer	38 min
Jun 19, 9:28 PM CDT	Severe Thunderstorm Warning	OUN	Logan	47 min
Jun 19, 9:42 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	33 min
Jun 19, 9:45 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	15 min
Jun 19, 9:55 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer	50 min
Jun 19, 9:56 PM CDT	Flash Flood Watch	OUN	Atoka, Beckham, Blaine, Bryan, Caddo, Canadian and 29 more	11 hr
Jun 19, 10:09 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	51 min
Jun 19, 10:12 PM CDT	Severe Thunderstorm Warning	OUN	Logan	46 min
Jun 19, 10:59 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	16 min
Jun 20, 12:04 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Jackson	41 min
Jun 20, 12:08 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma, Pottawatomie	52 min
Jun 20, 12:23 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Grady, Stephens, Tillman	52 min
Jun 20, 12:45 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	45 min
Jun 20, 1:03 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain	27 min
Jun 20, 1:05 AM CDT	Severe Thunderstorm Warning	OUN	Kiowa	25 min
Jun 20, 1:11 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	49 min
Jun 20, 1:16 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	59 min
Jun 20, 1:28 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa	47 min
Jun 20, 2:01 AM CDT	Severe Thunderstorm Warning	OUN	Jefferson	59 min
Jun 20, 2:09 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	51 min
Jun 20, 2:15 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	45 min
Jun 20, 2:26 AM CDT	Severe Thunderstorm Warning	OUN	Grady, Stephens	32 min

Nearby

Severe Thunderstorm Warnings in Texas, 2007 Every severe thunderstorm warning in 2007

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.