Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Norman, OK

May 19, 2012Harmon County, Oklahoma

NWS Norman, OK issued this special weather statement at May 19, 2012, 10:16 PM CDT for Harmon County, Oklahoma. It was in force for 29 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: May 19, 2012, 10:16 PM CDT (03:16 UTC)
Expired: May 19, 2012, 10:45 PM CDT
In force: 29 min
Issued by: NWS Norman, OK

County Harmon County, OK

The radar

The Altus AFB radar (KFDR), 91 km from the middle of the area, began a volume at 03:16 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 3.3 hours before the alert went out and 181 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: 6 J/kg
Mixed-layer CIN: -283 J/kg
Mixed-layer LCL: 3521 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 221 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.

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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 May 19, 6:39 PM CDT, 3 hours 37 minutes earlier.

Area forecast discussion, May 19, 6:39 PM CDT, 3 hours 37 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
639 PM CDT SAT MAY 19 2012

.DISCUSSION...
AVIATION DISCUSSION FOR THE 00Z TAFS IS BELOW.

&&

.AVIATION...
MAINLY VFR CONDITIONS ARE EXPECTED AT ALL SITES...THOUGH
CONFIDENCE IS LOW TO MODERATE.

ISO-SCT TSRA WILL AFFECT PARTS OF OKLAHOMA AND MOVE SOUTHEAST...
MAINLY AFFECT KCSM...KPNC...KOKC...KOUN...AND KHBR DURING THE
NEXT SEVERAL HOURS BEFORE WEAKENING BY 12Z. THESE STORMS COULD
BRING BRIEF GUSTY WINDS...HAIL...AND MVFR CONDITIONS IF THEY
DIRECTLY IMPACT A SITE. THINK KOKC WILL BE AFFECTED MAINLY 06-08Z.

THERE IS A LOW CHANCE FOR MVFR OR IFR CONDITIONS ACROSS MUCH OF
THE AREA 09-16Z. ONLY KEPT TEMPO MENTION OF MVFR CONDITIONS AT
KSPS WHERE CONFIDENCE OF THESE LOWER CONDITIONS IS MODERATE.

A FEW SHRA MAY BE LINGER OVER THE AREA AFTER 12Z...SO ADDED VCSH
AT SOME LOCATIONS. A FEW TSRA MAY REDEVELOP AFTER 19Z...BUT DID
NOT MENTION VCTS DUE TO LOW CONFIDENCE OF EXACT LOCATION
AND TIMING.

MBS

&&

.PREV DISCUSSION... /ISSUED 244 PM CDT SAT MAY 19 2012/

DISCUSSION...
COLD FRONT MAKING ITS WAY INTO FAR NORTHWEST OKLAHOMA THIS
AFTERNOON. CONSENSUS OF SHORT-TERM MODELS LEADS TO HIGHER POPS
ACROSS NORTH-CENTRAL OKLAHOMA THIS EVENING INTO CENTRAL OKLAHOMA
LATE TONIGHT AND SUNDAY MORNING. FAIRLY CONFIDENT THAT STORMS WILL
DEVELOP SOUTHWARD FROM KANSAS ALONG FRONTAL BOUNDARY WITH THE
DEVELOPMENT OF OVERNIGHT COMPLEX ACROSS CENTRAL OKLAHOMA A LITTLE
LESS CERTAIN. THERE WILL BE AN INITIAL SEVERE WEATHER POTENTIAL
FOR MUCH OF THE EVENING ACROSS NORTHWEST PARTS OF OKLAHOMA BUT
SEVERE POTENTIAL SHOULD DECREASE AS THE NIGHT PROGRESSES. STORM
CHANCES WILL REMAIN IN THE FORECAST THROUGH AT LEAST MONDAY NIGHT
WITH SURFACE BOUNDARY IN PLACE OVER/NEAR THE REGION AND SUBTLE
S/WVS IN DEVELOPING NORTHWEST FLOW.

UPPER RIDGING EXPECTED TO INCREASE TUESDAY ON SO WILL LEAVE
FORECAST DRY WITH WARMING TREND.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  66  82  62  83 /  60  40  40  30
HOBART OK         64  82  62  85 /  60  30  30  20
WICHITA FALLS TX  67  87  63  88 /  20  30  30  30
GAGE OK           56  76  56  81 /  40  20  20  20
PONCA CITY OK     63  79  59  80 /  50  50  30  10
DURANT OK         66  88  63  86 /  10  20  20  30

&&

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

03/17/17

Hazardous weather outlook, May 19, 11:30 AM CDT, 10 hours 46 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1130 AM CDT SAT MAY 19 2012

OKZ004>048-050>052-TXZ083>090-201000-
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-
1130 AM CDT SAT MAY 19 2012

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS PORTIONS OF NORTHERN AND WESTERN OKLAHOMA AND WESTERN NORTH
TEXAS.

LOCATION...
THE RISK AREA IS NEAR AND NORTHWEST OF A LINE FROM PONCA CITY
TO EL RENO TO FREDERICK OKLAHOMA TO VERNON AND BENJAMIN TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE WEATHER IS FROM 4 PM
THROUGH MIDNIGHT.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS.

IMPACTS...
HAIL LARGER THAN GOLF BALLS CAN CAUSE DAMAGE TO ROOFS...CROPS AND
CARS. THUNDERSTORM WINDS OVER 65 MPH MAY CAUSE DAMAGE TO
STRUCTURES... TREES AND UTILITY LINES.

DISCUSSION...
ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED
TO DEVELOP ALONG A COLD FRONT IN NORTHWEST OKLAHOMA THIS AFTERNOON.
SUFFICIENT INSTABILITY AND DEEP LAYER SHEAR AHEAD OF THE FRONT...WILL
SUPPORT THE DEVELOPMENT OF SUPERCELL THUNDERSTORMS.  ADDITIONAL
THUNDERSTORMS ARE EXPECTED TO DEVELOP AS THE COLD FRONT MOVES
SLOWLY SOUTH DURING THE EVENING AND OVERNIGHT HOURS.  THUNDERSTORMS
WILL PERSIST OVERNIGHT AND CONTINUE TO SPREAD FARTHER
SOUTHEAST... HOWEVER THE CHANCE OF SEVERE WEATHER WILL DECREASE OVERNIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SUNDAY MAY 20.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...90 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...60 PERCENT.

OTHER HAZARDOUS WEATHER...
GUSTY SOUTH WINDS ARE EXPECTED ACROSS MOST OF THE AREA TODAY. THIS
WILL MAKE FOR DIFFICULT DRIVING CONDITIONS... ESPECIALLY ON EAST
WEST ROADWAYS FOR HIGH PROFILE VEHICLES.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS CHANCES WILL PERSIST SUNDAY AND MONDAY AS THE COLD
FRONT MOVES SLOWLY SOUTHEAST THROUGH THE AREA. THE RISK OF SEVERE
WEATHER IS RELATIVELY LOW.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY
5 AM SUNDAY.

In the hours before

Special weather statement, May 19, 9:03 PM CDT, 1 hour 13 minutes before

SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 903 PM
CDT SAT MAY 19 2012

OKZ010-011-200230-
WOODWARD OK-MAJOR OK-
903 PM CDT SAT MAY 19 2012

...SIGNIFICANT WEATHER ADVISORY FOR WOODWARD AND NORTHWESTERN
MAJOR COUNTIES UNTIL 930 PM CDT...

AT 858 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR WOODWARD...
MOVING EAST NORTHEAST AT 25 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 40 MPH...

LOCATIONS IMPACTED INCLUDE...
WOODWARD...MOORELAND AND QUINLAN.

LAT...LON 3660 9897 3634 9894 3636 9938 3654 9940
      3661 9898
TIME...MOT...LOC 0158Z 264DEG 22KT 3645 9934

Local storm report, May 19, 9:06 PM CDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
906 PM CDT SAT MAY 19 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0901 PM     HAIL             1 E ELK CITY            35.40N 99.39W
05/19/2012  E1.25 INCH       BECKHAM            OK   NWS EMPLOYEE

            LARGE AMOUNTS ON GROUND

&&

JPIKE

Local storm report, May 19, 9:14 PM CDT, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
914 PM CDT SAT MAY 19 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0910 PM     HAIL             5 N CARTER              35.29N 99.50W
05/19/2012  E1.75 INCH       BECKHAM            OK   FIRE DEPT/RESCUE

            JUST EAST OF THE JCT OF HWY 34 AND 152

&&

JPIKE

Local storm report, May 19, 9:31 PM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
931 PM CDT SAT MAY 19 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0929 PM     HAIL             2 N WILLOW              35.08N 99.51W
05/19/2012  E1.00 INCH       GREER              OK   TRAINED SPOTTER

&&

MBS

Special weather statement, May 19, 9:37 PM CDT, 39 minutes before

SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 937 PM
CDT SAT MAY 19 2012

OKZ021-033-034-200300-
HARMON OK-GREER OK-BECKHAM OK-
937 PM CDT SAT MAY 19 2012

...SIGNIFICANT WEATHER ADVISORY FOR HARMON...GREER AND
SOUTHWESTERN BECKHAM COUNTIES UNTIL 1000 PM CDT...

AT 935 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR DODSON...
MOVING EAST AT 35 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 40 MPH...

LOCATIONS IMPACTED INCLUDE...
VINSON...MADGE AND MCKNIGHT.

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

LAT...LON 3496 10000 3515 9975 3513 9972 3475 9948
      3468 10000
TIME...MOT...LOC 0235Z 254DEG 31KT 3478 10006

Special weather statement, May 19, 10:16 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1016 PM CDT SAT MAY 19 2012

OKZ033-034-036-200345-
HARMON OK-GREER OK-JACKSON OK-
1016 PM CDT SAT MAY 19 2012

...SIGNIFICANT WEATHER ADVISORY FOR HARMON...SOUTHWESTERN GREER
AND NORTHWESTERN JACKSON COUNTIES UNTIL 1045 PM CDT...

AT 1012 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR VINSON...
MOVING EAST AT 20 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LOCATIONS IMPACTED INCLUDE...
VINSON.

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

LAT...LON 3497 9987 3501 9964 3466 9954 3472 9987
TIME...MOT...LOC 0312Z 261DEG 16KT 3489 9981

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 7:28 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Blaine, Custer, Dewey, Roger Mills, Washita	62 min
May 19, 7:38 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woodward	30 min
May 19, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	62 min
May 19, 8:50 PM CDT	Severe Thunderstorm Warning	OUN	Grant	40 min
May 19, 9:03 PM CDT	Special Weather Statement	OUN	Woodward	27 min
May 19, 9:16 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	59 min
May 19, 9:23 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	56 min
May 19, 9:27 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Blaine, Caddo, Custer, Washita	63 min
May 19, 9:37 PM CDT	Special Weather Statement	OUN	Harmon	23 min
May 19, 10:08 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	67 min
May 19, 10:23 PM CDT	Special Weather Statement	OUN	Major	37 min
May 19, 10:41 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	54 min
May 19, 10:47 PM CDT	Special Weather Statement	OUN	Caddo	28 min
May 19, 11:07 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	53 min
May 19, 11:19 PM CDT	Special Weather Statement	OUN	Caddo	26 min
May 19, 11:26 PM CDT	Special Weather Statement	OUN	Kiowa	34 min
May 19, 11:50 PM CDT	Special Weather Statement	OUN	Caddo	25 min
May 19, 11:54 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	47 min
May 20, 12:13 AM CDT	Special Weather Statement	OUN	Caddo	32 min
May 20, 12:20 AM CDT	Special Weather Statement	OUN	Washita	25 min
May 20, 12:28 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	36 min
May 20, 12:38 AM CDT	Severe Thunderstorm Warning	OUN	Washita	67 min
May 20, 12:48 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	57 min
May 20, 1:21 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	37 min
May 20, 1:44 AM CDT	Special Weather Statement	OUN	Kiowa	31 min
May 20, 1:59 AM CDT	Special Weather Statement	OUN	Pottawatomie, Seminole	31 min
May 20, 2:07 AM CDT	Special Weather Statement	OUN	Grady	38 min
May 20, 2:42 AM CDT	Special Weather Statement	OUN	Caddo, Grady	48 min
May 20, 3:15 AM CDT	Special Weather Statement	OUN	Garvin	30 min
May 20, 3:34 AM CDT	Special Weather Statement	OUN	Grady	41 min
May 20, 3:35 AM CDT	Special Weather Statement	OUN	Garvin	25 min
May 20, 4:08 AM CDT	Special Weather Statement	OUN	Seminole	37 min
May 20, 4:28 AM CDT	Special Weather Statement	OUN	Garvin	32 min
May 20, 4:35 AM CDT	Special Weather Statement	OUN	Seminole	25 min
May 20, 5:03 AM CDT	Special Weather Statement	OUN	Caddo	27 min
May 20, 5:18 AM CDT	Areal Flood Advisory	OUN	Caddo, Grady	3 hr
May 20, 5:30 AM CDT	Special Weather Statement	OUN	Caddo	30 min
May 20, 8:23 AM CDT	Special Weather Statement	OUN	Stephens	37 min
May 20, 9:03 AM CDT	Special Weather Statement	OUN	Carter	27 min
May 20, 10:13 AM CDT	Special Weather Statement	OUN	Canadian	32 min
May 20, 10:55 AM CDT	Special Weather Statement	OUN	Oklahoma	35 min
May 20, 11:22 AM CDT	Special Weather Statement	OUN	Canadian	38 min
May 20, 4:00 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	45 min
May 20, 4:39 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	42 min
May 20, 3:33 PM CDT	Special Weather Statement	OUN	Wilbarger	42 min
May 20, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Wichita, Wilbarger	48 min
May 20, 5:36 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita, Wilbarger	33 min
May 20, 5:44 PM CDT	Special Weather Statement	OUN	Baylor	46 min
May 20, 5:48 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wilbarger	42 min
May 20, 6:30 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	13 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.