Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 556, NWS Norman, OK

June 27, 20135 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 27, 2013, 6:02 PM CDT for 5 counties in Oklahoma. It was in force for 58 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 27, 2013, 6:02 PM CDT (23:02 UTC)
Expired
Jun 27, 2013, 7:00 PM CDT
In force
58 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Alfalfa County, OK, Ellis County, OK, Harper County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 95 km from the middle of the area, began a volume at 23:04 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.

IssuedProductOfficeLasted
Jun 27, 5:14 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 11.0 hours before the alert went out and 147 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, Dodge City, at 12:00Z on 2013-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2230 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, Dodge City, at 12:00Z on 2013-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -38 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
2230 J/kg
Mixed-layer CIN
-276 J/kg
Mixed-layer LCL
2091 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
-38 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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 27, 3:40 PM CDT, 2 hours 22 minutes earlier.

Area forecast discussion, Jun 27, 3:40 PM CDT, 2 hours 22 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
340 PM CDT THU JUN 27 2013

.DISCUSSION...
STORMS HAVE BEEN DEVELOPING IN KANSAS THAT ARE EXPECTED TO MAKE A
MOVE INTO THE AREA THIS EVENING. INSTABILITY IS VERY HIGH AND WIND
SHEAR IS SUFFICIENT TO SUPPORT SEVERE THUNDERSTORMS. THERE WILL BE
AN INCREASING FIGHT AGAINST CONVECTIVE INHIBITION AS THE STORMS
MOVE SOUTHEAST AND DIURNAL HEATING WANES. SO WILL LIKELY SEE
STORMS IN THE AREA THIS EVENING /ALTHOUGH THE AREAL COVERAGE
REMAINS UNCERTAIN/. AFTER MIDNIGHT... STORM CHANCES BE CONFINED
MOSTLY TO THE NORTHEAST. A COLD FRONT WILL ALSO BE MOVING THROUGH
THE AREA OVERNIGHT. THIS WILL BRING COOLER TEMPERATURES TO MUCH OF
THE AREA... ALTHOUGH HOT TEMPERATURES WILL STILL PERSIST IN THE
SOUTH. DEWPOINTS SHOULD BE LOWERED ENOUGH BEHIND THE FRONT THAT
HEAT INDEX VALUES WILL BE 105 OR BELOW EVEN IN AREAS SOUTHWEST
WHERE TEMPERATURES MAY STILL BE WELL INTO THE TRIPLE DIGITS. SO
WILL LET THE CURRENT HEAT ADVISORY EXPIRE AS PLANNED THIS
EVENING. LATER SHIFTS WILL NEED TO REEVALUATE AS WE SEE HOW THE
FORECAST OF POST-FRONTAL DEWPOINTS EVOLVE.

BEYOND THIS... THE AREA GENERALLY REMAINS UNDERNEATH NORTHWEST
FLOW ALOFT WHICH WILL KEEP TEMPERATURES RELATIVELY COOL AND ALSO
KEEP AT LEAST SOME STORM CHANCES IN THE FORECAST IN THE EXTENDED
PERIODS.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  76  96  70  90 /  20  10  10  10
HOBART OK         76 104  72  97 /  10  10  20  10
WICHITA FALLS TX  77 105  74  96 /  10  10  10  10
GAGE OK           71  96  67  90 /  20  10  20  10
PONCA CITY OK     75  96  66  90 /  40  10   0  10
DURANT OK         76 100  72  93 /  10  10  10   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...HEAT ADVISORY UNTIL 8 PM CDT THIS EVENING FOR OKZ004>048-050>052.

TX...HEAT ADVISORY UNTIL 8 PM CDT THIS EVENING FOR TXZ083>090.

&&
Hazardous weather outlook, Jun 27, 5:18 PM CDT, 44 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
518 PM CDT THU JUN 27 2013

OKZ004>048-050>052-TXZ083>090-281000-
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-
518 PM CDT THU JUN 27 2013

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TONIGHT ACROSS
PRIMARILY THE NORTHERN HALF OF OKLAHOMA.

LOCATION...
THE SLIGHT RISK AREA IS NORTH OF A PRAGUE TO EDMOND TO CHEYENNE
LINE.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE THROUGH
MIDNIGHT TONIGHT.

HAZARDS...
DAMAGING WINDS IN EXCESS OF 70 MPH...
LARGE HAIL TO SOFTBALLS...
HEAVY RAINFALL OVER ONE INCH...

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

DISCUSSION...
THUNDERSTORMS THAT DEVELOPED IN PARTS OF CENTRAL AND SOUTHWESTERN KANSAS
THIS AFTERNOON WILL MOVE SOUTH INTO PARTS OF NORTHERN AND POSSIBLY CENTRAL
OKLAHOMA THIS EVENING. VERY STRONG INSTABILITY AND SUFFICIENT WIND SHEAR
WILL SUPPORT SEVERE STORMS CAPABLE OF PRODUCING VERY LARGE HAIL UP TO
THE SIZE OF SOFTBALLS AND WIND GUSTS IN EXCESS OF 70 MPH. LOCALLY HEAVY
RAINFALL WILL ALSO BE POSSIBLE.

THE SEVERE POTENTIAL IS EXPECTED TO DECREASE LATE THIS EVENING BUT
STORMS COULD REMAIN POSSIBLE INTO THE EARLY MORNING HOURS ACROSS PARTS
OF NORTH CENTRAL AND CENTRAL OKLAHOMA.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRIDAY JUN 28.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...90 PERCENT.

OTHER HAZARDOUS WEATHER...
DANGEROUS HEAT CAN BE EXPECTED THROUGH 8 PM THIS EVENING ACROSS
THE ENTIRE AREA. A HEAT ADVISORY IS IN EFFECT. STRENUOUS OUTDOOR
ACTIVITIES SHOULD BE DEFERRED TO THE EVENING HOURS IF POSSIBLE.
IF YOU HAVE TO BE OUTDOORS...DRINK PLENTY OF WATER AND TAKE
FREQUENT BREAKS IN THE SHADE.

FOR ABSOLUTELY NO REASON...SHOULD YOU LEAVE CHILDREN OR PETS
UNATTENDED IN ANY VEHICLE FOR ANY AMOUNT OF TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

THUNDERSTORM OUTLOOK...
THERE ARE CHANCES FOR THUNDERSTORMS ACROSS PARTS OF OKLAHOMA AND
WESTERN NORTH TEXAS NEARLY EACH DAY THROUGH WEDNESDAY.
ORGANIZED SEVERE STORMS ARE NOT LIKELY.

OTHER HAZARDOUS WEATHER...
HIGH TEMPERATURES BETWEEN 92 AND 108 DEGREES WILL OCCUR ACROSS
THE AREA ON FRIDAY. STRENUOUS OUTDOOR ACTIVITIES SHOULD BE
DONE DURING THE MORNING OR EVENING HOURS. IF YOU HAVE TO BE
OUTDOORS...DRINK PLENTY OF WATER AND TAKE FREQUENT BREAKS IN
THE SHADE.

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

MBS/RB/JTK/EM

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 3:20 AM CDTHeat AdvisoryOUNAlfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 42 more17 hr
Jun 27, 6:56 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant, Major, Woods64 min
Jun 27, 6:59 PM CDTSpecial Weather StatementOUNDewey, Ellis, Harper, Woodward31 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2013Every severe thunderstorm warning in 2013

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.