Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Norman, OK

July 20, 2012Pontotoc County, Oklahoma

NWS Norman, OK issued this special weather statement at Jul 20, 2012, 3:11 PM CDT for Pontotoc County, Oklahoma. It was in force for 49 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: Jul 20, 2012, 3:11 PM CDT (20:11 UTC)
Expired: Jul 20, 2012, 4:00 PM CDT
In force: 49 min
Issued by: NWS Norman, OK

County Pontotoc County, OK

The radar

The Norman radar (KTLX), 81 km from the middle of the area, began a volume at 20:13 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 8.2 hours before the alert went out and 82 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: 1425 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 2000 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 20, 2:38 PM CDT, 33 minutes earlier.

Area forecast discussion, Jul 20, 2:38 PM CDT, 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
238 PM CDT FRI JUL 20 2012

.DISCUSSION...
DOMINANT UPPER RIDGE IS SET TO REMAIN IN PLACE THROUGH AT LEAST
THE EARLY PART OF NEXT WEEK. AS SUCH...EXPECT MUCH ABOVE AVERAGE
HIGH TEMPS. THIS WILL ESPECIALLY BE THE CASE ACROSS NORTHERN
OKLAHOMA...NEARER THE RIDGE CENTER. GIVEN THE STRENGTH OF THIS
SYSTEM AND CONTINUED DRYING OF SFC...OPTED TO GO SEVERAL DEGREES
ABOVE GUIDANCE THROUGH SUNDAY. WITH TRIPLE DIGITS EXPECTED OVER
THE ENTIRE FA AND RATHER WARM OVERNIGHT TEMPS...WILL KEEP HEAT
ADVISORY IN EFFECT THROUGH MONDAY. BE SURE TO FOLLOW HEAT SAFETY
GUIDELINES THIS WEEKEND IF PLANNING OUTDOOR ACTIVITIES AS IT WILL
LIKELY BE THE HOTTEST WEEKEND WE HAVE SEEN SO FAR THIS YEAR. WITH
LARGE SCALE SUBSIDENCE...RAIN CHANCES WILL BE ALMOST NON-
EXISTENT...BUT GIVEN DEGREE OF HEATING AND A FAIR AMOUNT OF
MOISTURE ACROSS THE SRN THIRD OF THE AREA...AN ISOLATED SHOWER OR
STORM IS NOT OUT OF THE QUESTION ALMOST ANY AFTERNOON. STILL...NO
SFC BOUNDARIES OR AREAS OF UPPER FORCING ARE FORECAST AND WILL
KEEP POPS BELOW 20 PERCENT THROUGH THE ENTIRE FORECAST PERIOD. A
BIT OF RELIEF FROM THE HEAT MAY BE ON THE HORIZON AS THE MID LEVEL
RIDGE BREAKS DOWN AND SHIFTS SOUTHEASTWARD BY MID TO LATE NEXT
WEEK. FOR NOW...WILL KEEP UPPER 90S TO LOW 100S IN THE FORECAST.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  76 105  74 105 /   0   0   0   0
HOBART OK         75 107  74 105 /   0   0   0   0
WICHITA FALLS TX  78 108  78 109 /  10   0  10  10
GAGE OK           74 107  72 106 /   0   0   0   0
PONCA CITY OK     71 107  73 109 /   0   0   0   0
DURANT OK         76 103  77 105 /  10   0  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...HEAT ADVISORY UNTIL 7 PM CDT MONDAY FOR OKZ004>048-050>052.

TX...HEAT ADVISORY UNTIL 7 PM CDT MONDAY FOR TXZ083>090.

&&

26/84

Hazardous weather outlook, Jul 20, 11:58 AM CDT, 3 hours 13 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1158 AM CDT FRI JUL 20 2012

OKZ004>048-050>052-TXZ083>090-211200-
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-
1158 AM CDT FRI JUL 20 2012

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

.DAY ONE...TODAY AND TONIGHT...

THUNDERSTORM OUTLOOK...
ISOLATED THUNDERSTORMS ARE POSSIBLE.

DISCUSSION...
ISOLATED SHOWERS AND A FEW THUNDERSTORMS WILL BE POSSIBLE ACROSS
SOUTHERN OKLAHOMA THIS AFTERNOON IN RESPONSE TO AN UPPER LEVEL
DISTURBANCE.  BY LATE THIS AFTERNOON...STRONG DAYTIME HEATING AND A
WEAK SURFACE TROUGH MAY RESULT IN ISOLATED STORMS ACROSS NORTHERN
AND CENTRAL OKLAHOMA. ANY STORM THAT FORMS THIS AFTERNOON WILL BE
CAPABLE OF PRODUCING DAMAGING WINDS OVER 60 MPH.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SATURDAY JUL 21.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
               NWS NORMAN COUNTY WARNING AREA...30 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...30 PERCENT.

OTHER HAZARDOUS WEATHER...
A HEAT ADVISORY IS IN EFFECT FOR MOST OF OKLAHOMA AND PART OF
WESTERN NORTH TEXAS.  FOLLOW HEAT SAFETY GUIDELINES IF PLANNING TO
BE OUTDOORS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

THUNDERSTORM OUTLOOK...
AN UPPER LEVEL RIDGE...CENTER OVER THE CENTRAL PLAINS...WILL BRING
AN EXTENDED PERIOD OF VERY HOT TEMPERATURES.  THUNDERSTORM CHANCES
WILL REMAIN VERY LOW THROUGH THE MIDDLE OF NEXT WEEK.

OTHER HAZARDOUS WEATHER...
A HEAT ADVISORY IS IN EFFECT FOR MOST OF OKLAHOMA AND PART OF
WESTERN NORTH TEXAS THROUGH MONDAY.  FOLLOW HEAT SAFETY GUIDELINES
IF PLANNING TO BE OUTDOORS.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 5
AM SATURDAY JULY 21.

In the hours before

Special weather statement, Jul 20, 3:11 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
311 PM CDT FRI JUL 20 2012

OKZ040-042-202100-
GARVIN OK-PONTOTOC OK-
311 PM CDT FRI JUL 20 2012

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN GARVIN AND CENTRAL
PONTOTOC COUNTIES UNTIL 400 PM CDT...

AT 311 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR ADA...
MOVING SOUTH AT 10 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...
FREQUENT CLOUD TO GROUND LIGHTNING...

LOCATIONS IMPACTED INCLUDE...
ADA...STRATFORD...BYNG...FRANCIS...FITZHUGH AND VANOSS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3464 9654 3464 9701 3485 9696 3487 9674
      3486 9671 3488 9669 3489 9655 3487 9654
      3487 9651 3489 9650 3490 9642
TIME...MOT...LOC 2008Z 1DEG 10KT 3478 9675

MBS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:12 PM CDT	Special Weather Statement	OUN	Major	48 min
Jul 19, 7:15 PM CDT	Special Weather Statement	OUN	Garfield	45 min
Jul 20, 5:09 AM CDT	Heat Advisory	OUN	Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 42 more	4 days
Jul 20, 3:44 PM CDT	Special Weather Statement	OUN	Johnston, Murray, Pontotoc	61 min
Jul 20, 3:48 PM CDT	Severe Thunderstorm Warning	OUN	Johnston, Murray, Pontotoc	42 min
Jul 20, 4:28 PM CDT	Special Weather Statement	OUN	Murray	47 min
Jul 20, 4:55 PM CDT	Special Weather Statement	OUN	Beckham	35 min
Jul 20, 4:56 PM CDT	Special Weather Statement	OUN	Washita	34 min
Jul 20, 5:31 PM CDT	Special Weather Statement	OUN	Beckham	29 min
Jul 20, 4:47 PM CDT	Special Weather Statement	OUN	Archer	28 min
Jul 20, 4:59 PM CDT	Special Weather Statement	OUN	Baylor	31 min

Nearby

Special Weather Statements in Oklahoma, 2012 Every special weather statement 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.