Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 369, NWS Norman, OK

June 4, 2012Knox County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jun 4, 2012, 8:24 PM CDT for Knox County, Texas. It was in force for 19 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 4, 2012, 8:24 PM CDT (01:24 UTC)
Expired: Jun 4, 2012, 8:43 PM CDT
In force: 19 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Knox County, TX

The radar

The Dyess AFB radar (KDYX), 118 km from the middle of the area, began a volume at 01:27 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.4 hours before the alert went out and 255 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: 2833 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1674 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

886 
WUUS54 KOUN 050124
SVROUN
TXC275-050200-
/O.NEW.KOUN.SV.W.0369.120605T0124Z-120605T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
824 PM CDT MON JUN 4 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHWESTERN KNOX COUNTY IN NORTHERN TEXAS...

* UNTIL 900 PM CDT

* AT 820 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP 
  TO TWO INCHES IN DIAMETER. THIS STORM WAS LOCATED NEAR O'BRIEN...
  MOVING NORTHWEST AT 15 MPH. 

* THIS SEVERE THUNDERSTORM WILL REMAIN OVER RURAL AREAS OF EXTREME 
  SOUTHWESTERN KNOX COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

LARGE DAMAGING HAIL IS LIKELY. TAKE SHELTER NOW IN A STURDY 
BUILDING AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3340 9992 3341 10000 3351 10000 3351 9996
      3343 9984 3339 9987
TIME...MOT...LOC 0120Z 117DEG 15KT 3339 9996 

$$

CMS

1 follow-up statement

436 
WWUS54 KOUN 050143
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
843 PM CDT MON JUN 4 2012

TXC275-050210-
/O.CAN.KOUN.SV.W.0369.000000T0000Z-120605T0200Z/
KNOX TX-
843 PM CDT MON JUN 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTHWESTERN KNOX 
COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAD MOVED OUT OF THE AREA. 
THEREFORE THE WARNING HAS BEEN CANCELLED. 

LAT...LON 3340 9992 3341 10000 3351 10000 3351 9996
      3343 9984 3339 9987
TIME...MOT...LOC 0143Z 117DEG 15KT 3339 9996 

$$

CMS

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 4, 6:42 PM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jun 4, 6:42 PM CDT, 1 hour 42 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
642 PM CDT MON JUN 4 2012

.AVIATION...
SCT TSRA MAY OCCUR VCNTY KSPS THIS EVENING. ISOLD TSRA ARE
POSSIBLE ELSEWHERE THIS EVENING. CONVECTION SHOULD DIMINISH AFTER
DARK...UNLESS THE TSRA COMPLEXES OVER W TX/E NM/SE CO/SW KS CAUSE
UNEXPECTED LOW-LEVEL LIFT OR UPPER-LEVEL SUPPORT OVER OUR FORECAST
AREA. OTHERWISE...EXPECT VFR CONDITIONS AND GENERALLY LIGHT WINDS
THROUGH TOMORROW AFTERNOON.

&&

.PREV DISCUSSION... /ISSUED 404 PM CDT MON JUN 4 2012/

DISCUSSION...
SCATTERED THUNDERSTORMS WILL BE POSSIBLE MAINLY ACROSS FAR WESTERN
AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS LATE THIS
AFTERNOON AND THIS EVENING. SUBSIDENCE/STABILIZATION WEST OF
ARKANSAS MCV IS EXPECTED TO KEEP STORM CHANCES VERY LOW TONIGHT
ACROSS CENTRAL AND NORTH-CENTRAL OKLAHOMA. FLY IN THE OINTMENT
THERE WILL BE WEAK FRONTAL BOUNDARY THAT WILL MOVE IN TONIGHT AND
TUESDAY MORNING.

PREVIOUS FORECAST OF CHANCE POPS ACROSS WESTERN AND SOUTHERN
PORTIONS OF CWA...WITH LOWEST POPS ACROSS NORTHERN OKLAHOMA...
WILL BE RETAINED THROUGH THE END OF THE WEEK. LARGE SCALE PATTERN
OF HIGH AMPLITUDE RIDGE WITH WEAKNESS/UPPER LOW "TRAPPED" HAS
HISTORICALLY LEAD TO DAY TO DAY MCS ACTIVITY THAT THE MODELS WILL
HAVE TROUBLE FORECASTING. THUS...THE RELATIVELY LOW POPS DAY TO
DAY THROUGH THE WEEK WILL LIKELY BE ADJUSTED BASED ON LATE DAY
OVERNIGHT CONVECTIVE EVOLUTIONS.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  73  89  67  85 /  10  20  20  20
HOBART OK         72  90  67  87 /  30  30  30  30
WICHITA FALLS TX  73  92  69  88 /  40  40  40  30
GAGE OK           66  87  62  88 /  20  20  20  20
PONCA CITY OK     68  87  63  86 /  10  20  10  20
DURANT OK         73  92  69  86 /  30  40  30  30

&&

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

02/23/23

Hazardous weather outlook, Jun 4, 11:55 AM CDT, 8 hours 29 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT MON JUN 4 2012

OKZ004>048-050>052-TXZ083>090-051100-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
1155 AM CDT MON JUN 4 2012

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...THROUGH TONIGHT...

THUNDERSTORM OUTLOOK...
A FEW STRONG TO SEVERE STORMS ARE POSSIBLE LATE THIS AFTERNOON
AND EVENING...BUT ORGANIZED SEVERE WEATHER IS NOT ANTICIPATED.

DISCUSSION...
STRONG HEATING AND MUGGY CONDITIONS MAY RESULT IN WIDELY
SCATTERED THUNDERSTORMS LATE THIS AFTERNOON AND EVENING.  THE
BEST CHANCE FOR STORMS WILL BE ACROSS THE SOUTHERN THIRD OF OKLAHOMA
AND WESTERN NORTH TEXAS...WHERE A WEAK MID-LEVEL TROUGH AXIS WILL
BE LOCATED.  INSTABILITY WILL BE RATHER HIGH THIS AFTERNOON...SO
A FEW STRONG TO SEVERE STORMS ARE POSSIBLE...BUT WEAK MID AND
UPPER LEVEL WINDS WILL KEEP ORGANIZED SEVERE STORMS RATHER LOW.
STRONG WIND GUSTS NEAR 60 MPH...HEAVY RAINFALL...AND HALF-DOLLAR
SIZED HAIL MAY OCCUR WITH THE STRONGER STORMS.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY JUN 5.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...70 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...30 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
AN UPPER LEVEL RIDGE WILL BE SITUATED OVER THE CENTRAL UNITED
STATES THIS WEEK.  THIS WILL KEEP THUNDERSTORM CHANCES RATHER
LOW.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM
TUESDAY MORNING.

In the hours before

Special weather statement, Jun 4, 8:08 PM CDT, 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
808 PM CDT MON JUN 4 2012

TXZ087-050200-
KNOX TX-
808 PM CDT MON JUN 4 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN KNOX COUNTY UNTIL
900 PM CDT...

AT 805 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR ROCHESTER...
MOVING NORTHWEST AT 10 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...

LOCATIONS IMPACTED INCLUDE...
KNOX CITY.

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

LAT...LON 3340 9999 3352 9999 3358 9997 3340 9976
TIME...MOT...LOC 0105Z 127DEG 9KT 3334 9986

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 4, 8:08 PM CDT	Special Weather Statement	OUN	Knox	52 min
Jun 4, 11:11 PM CDT	Special Weather Statement	OUN	Knox	34 min
Jun 4, 11:47 PM CDT	Special Weather Statement	OUN	Knox	43 min
Jun 5, 12:41 AM CDT	Special Weather Statement	OUN	Foard, Knox	49 min
Jun 5, 1:21 AM CDT	Special Weather Statement	OUN	Hardeman	39 min
Jun 5, 1:24 AM CDT	Special Weather Statement	OUN	Baylor	36 min
Jun 5, 1:53 AM CDT	Special Weather Statement	OUN	Wilbarger	52 min
Jun 5, 2:04 AM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	12 min
Jun 5, 2:18 AM CDT	Special Weather Statement	OUN	Baylor	27 min
Jun 5, 2:44 AM CDT	Special Weather Statement	OUN	Wichita	61 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012 Every severe thunderstorm warning in 2012

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.