Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 253, NWS Norman, OK

August 18, 2014Garfield County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 18, 2014, 5:14 PM CDT for Garfield County, Oklahoma. It was in force for 46 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
Aug 18, 2014, 5:14 PM CDT (22:14 UTC)
Expired
Aug 18, 2014, 6:00 PM CDT
In force
46 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Garfield County, OK

The radar

The Vance AFB radar (KVNX), 51 km from the middle of the area, began a volume at 22:15 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, 10.2 hours before the alert went out and 133 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-pSkew-T log-p diagram, Norman, OK at 12:00Z on 2014-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 292 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 2014-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -30 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
292 J/kg
Mixed-layer CIN
-280 J/kg
Mixed-layer LCL
1396 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-30 m²/s²
0-3 km storm-relative helicity
-106 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 Aug 18, 3:19 PM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Aug 18, 3:19 PM CDT, 1 hour 55 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
319 PM CDT MON AUG 18 2014

.DISCUSSION...
IN THE WAKE OF THIS MORNINGS OUTFLOW BOUNDARY AND DECAYING
STORMS...THINGS HAVE REALLY HEATED UP. TRIPLE DIGITS WERE COMMON
ACROSS MUCH OF WESTERN OKLAHOMA AND WESTERN NORTH TEXAS...WITH
UPPER 90S ELSEWHERE. RECENTLY...VIS SATELLITE AND RADAR DEPICT
ISOLATED SHOWERS/STORMS DEVELOPING FROM SOUTHWEST KANSAS INTO
NORTHERN OKLAHOMA. STORMS MAY BECOME MORE SCATTERED THROUGH THE
LATE AFTERNOON AND EARLY EVENING...PARTICULARLY ACROSS NORTHERN
OKLAHOMA. STRONGER STORMS MAY PRODUCE GUSTY WINDS TO 40 OR 50
MPH...AND HEAVY RAINFALL. OTHERWISE...ACTIVITY SHOULD GENERALLY
DIMINISH OVERNIGHT.

THE WEATHER PATTERN OVER THE NEXT SEVERAL DAYS WILL GENERALLY BE
MUCH THE SAME AS TODAY. HIGHS SHOULD RANGE FROM THE UPPER 90S TO
LOW 100S BENEATH BROAD RIDGING. THESE TEMPERATURES COMBINED WITH
FAIRLY HIGH SURFACE MOISTURE WILL LEAD TO HEAT INDICES IN THE 100
TO 105 DEGREE RANGE INTO THE WEEKEND. IF YOU HAVE OUTDOOR
PLANS...MAKE SURE YOU DRINK PLENTY OF FLUIDS AND TAKE FREQUENT
BREAKS. OTHERWISE...STAY INSIDE IF YOU CAN! GIVEN LACK OF
SUBSTANTIAL UPPER FORCING AND NEGLIGIBLE SFC BOUNDARIES...WILL
MAINTAIN SILENT POPS INTO THE WEEKEND...BUT AN ISOLATED STORM OR
TWO COULD OCCUR ALMOST ANYWHERE GIVEN DAYTIME HEATING AND ABUNDANT
MOISTURE.

FROM THE WEEKEND INTO EARLY NEXT WEEK...LONG RANGE GUIDANCE
CONTINUES TO SUGGEST THE LARGE SCALE RIDGE MAY FLATTEN IN RESPONSE
TO SEVERAL UPPER WAVES/FRONTS MOVING ACROSS THE NORTHERN CONUS.
THIS MAY EVENTUALLY ALLOW FOR A SOUTHERN PLAINS FRONTAL PASSAGE BY
THE MIDDLE OF NEXT WEEK. SHOULD THIS OCCUR...SOME SLIGHTLY COOLER
TEMPERATURES MAY BE ON THE WAY...ALONG WITH INCREASING RAIN
CHANCES.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  73  98  74  97 /  10  10  10  10
HOBART OK         71  99  73  98 /   0  10  10  10
WICHITA FALLS TX  73  98  74 101 /   0  10  10  10
GAGE OK           69  97  72  97 /  20  10  10  10
PONCA CITY OK     73  97  74  97 /  20  10  10  10
DURANT OK         73  97  74  96 /   0  10  10  10

&&

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

30/84
Hazardous weather outlook, Aug 18, 9:55 AM CDT, 7 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
955 AM CDT MON AUG 18 2014

OKZ004>048-050>052-TXZ083>090-191000-
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-
955 AM CDT MON AUG 18 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN...
WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH
TEXAS.

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

.THUNDERSTORMS...
ISOLATED THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON INTO TONIGHT
ACROSS PORTIONS OF NORTHERN OKLAHOMA. THE MAIN HAZARDS WITH ANY
STORM ARE GUSTY WINDS UP TO 50 MPH...LOCALLY HEAVY RAINFALL...
FREQUENT LIGHTNING...AND SMALL HAIL. ORGANIZED SEVERE STORMS ARE
NOT EXPECTED TODAY OR TONIGHT.

.HEAT...
HOT AND HUMID CONDITIONS ARE EXPECTED TODAY...MAINLY ACROSS
SOUTHWESTERN OKLAHOMA AND WESTERN NORTH TEXAS WITH TRIPLE DIGIT
TEMPERATURES AND HEAT INDEX VALUES. SO TAKE HEAT SAFETY
PRECAUTIONS IF YOU ARE GOING TO BE OUTDOORS.

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

.HEAT...
HOT AND HUMID CONDITIONS WILL CONTINUE THROUGH THE WEEKEND...
WITH TRIPLE DIGIT TEMPERATURES AND HEAT INDEX VALUES ACROSS PARTS
OF OKLAHOMA AND WESTERN NORTH TEXAS. SO TAKE HEAT SAFETY
PRECAUTIONS IF YOU ARE GOING TO BE OUTDOORS.

GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW
OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK.

MBS/30

In the hours before

Special weather statement, Aug 18, 4:01 PM CDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
401 PM CDT MON AUG 18 2014

OKZ006-182130-
ALFALFA OK-
401 PM CDT MON AUG 18 2014

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN ALFALFA COUNTY UNTIL
430 PM CDT...

AT 358 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTHWEST
OF GREAT SALT PLAINS LAKE...MOVING NORTHEAST AT 10 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...

LAT...LON 3670 9830 3684 9837 3694 9811 3670 9813
TIME...MOT...LOC 2058Z 241DEG 8KT 3680 9824
Special weather statement, Aug 18, 4:03 PM CDT, 1 hour 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
403 PM CDT MON AUG 18 2014

OKZ008-012-013-182130-
GARFIELD OK-KAY OK-NOBLE OK-
403 PM CDT MON AUG 18 2014

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN GARFIELD...
SOUTHWESTERN KAY AND NORTHWESTERN NOBLE COUNTIES UNTIL 430 PM CDT...

AT 401 PM CDT...A STRONG THUNDERSTORM WAS LOCATED OVER BILLINGS...
MOVING NORTHEAST AT 10 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

LAT...LON 3638 9703 3642 9748 3656 9757 3660 9750
      3659 9747 3662 9746 3664 9742 3667 9713
TIME...MOT...LOC 2101Z 241DEG 8KT 3652 9744
Special weather statement, Aug 18, 4:35 PM CDT, 39 minutes before
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Special weather statement, Aug 18, 4:46 PM CDT, 28 minutes before
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Local storm report, Aug 18, 4:55 PM CDT, 19 minutes before
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Special weather statement, Aug 18, 5:03 PM CDT, 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 1:39 AM CDTSpecial Weather StatementOUNGrant, Kay36 min
Aug 18, 2:10 AM CDTSpecial Weather StatementOUNGarfield, Grant, Kay, Noble50 min
Aug 18, 2:59 AM CDTSpecial Weather StatementOUNKay, Noble31 min
Aug 18, 3:30 AM CDTSpecial Weather StatementOUNNoble, Payne30 min
Aug 18, 4:02 AM CDTSpecial Weather StatementOUNCleveland, Lincoln, Logan, Oklahoma43 min
Aug 18, 5:15 AM CDTSpecial Weather StatementOUNLogan30 min
Aug 18, 3:16 PM CDTSpecial Weather StatementOUNNoble29 min
Aug 18, 3:26 PM CDTSpecial Weather StatementOUNGrant49 min
Aug 18, 3:35 PM CDTSpecial Weather StatementOUNAlfalfa25 min
Aug 18, 3:45 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant45 min
Aug 18, 4:01 PM CDTSpecial Weather StatementOUNAlfalfa29 min
Aug 18, 4:03 PM CDTSpecial Weather StatementOUNNoble27 min
Aug 18, 4:17 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Grant43 min
Aug 18, 4:19 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant41 min
Aug 18, 4:35 PM CDTSpecial Weather StatementOUNNoble10 min
Aug 18, 4:46 PM CDTSpecial Weather StatementOUNNoble14 min
Aug 18, 5:03 PM CDTSpecial Weather StatementOUNAlfalfa, Garfield, Noble27 min
Aug 18, 5:22 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant53 min
Aug 18, 5:25 PM CDTSpecial Weather StatementOUNGarfield35 min
Aug 18, 5:39 PM CDTSevere Thunderstorm WarningOUNGarfield, Logan, Noble, Payne51 min
Aug 18, 6:01 PM CDTSpecial Weather StatementOUNHarper14 min
Aug 18, 6:20 PM CDTSpecial Weather StatementOUNCanadian, Oklahoma40 min
Aug 18, 6:24 PM CDTSpecial Weather StatementOUNHarper36 min
Aug 18, 6:33 PM CDTSpecial Weather StatementOUNLogan27 min
Aug 18, 6:40 PM CDTSpecial Weather StatementOUNPayne35 min
Aug 18, 6:45 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woodward30 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2014Every severe thunderstorm warning in 2014

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.