Alert archive / Oklahoma / Special Weather Statements in 2011

Special Weather Statement, NWS Norman, OK

May 31, 2011Harmon County, Oklahoma

NWS Norman, OK issued this special weather statement at May 31, 2011, 1:07 AM CDT for Harmon County, Oklahoma. It was in force for 23 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 31, 2011, 1:07 AM CDT (06:07 UTC)
Expired
May 31, 2011, 1:30 AM CDT
In force
23 min
Issued by
NWS Norman, OK

County Harmon County, OK

The radar

The Altus AFB radar (KFDR), 88 km from the middle of the area, began a volume at 06:07 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, 6.1 hours before the alert went out and 179 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, Amarillo Airport, TX at 00:00Z on 2011-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Amarillo Airport, TX at 00:00Z on 2011-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
5082 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
87 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.

208 
WWUS84 KOUN 310607
SPSOUN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
107 AM CDT TUE MAY 31 2011

OKZ033-310630-
HARMON OK-
107 AM CDT TUE MAY 31 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR HARMON COUNTY.

AT 106 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED 25 MILES SOUTHWEST 
OF HOLLIS...MOVING NORTHEAST AT 40 MPH.  STRONG SOUTH WINDS WITH
GUSTS TO 55 MPH MAY OCCUR AS THUNDERSTORMS APPROACH FROM
THE WEST AND SOUTHWEST.  A SEVERE THUNDERSTORM WARNING MAY BE 
REQUIRED FOR HARMON COUNTY WITHIN THE NEXT 30 MINUTES.

LAT...LON 3491 9981 3472 9970 3453 9966 3454 9982
      3458 9994 3459 10000 3477 10001

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 12:12 AM CDTSpecial Weather StatementOUNBeckham18 min
May 31, 12:24 AM CDTSpecial Weather StatementOUNHarper36 min
May 31, 12:39 AM CDTSpecial Weather StatementOUNHarmon21 min
May 31, 1:23 AM CDTSevere Thunderstorm WarningOUNHarmon, Jackson52 min
May 31, 1:32 AM CDTSpecial Weather StatementOUNWoods28 min
May 31, 1:41 AM CDTSpecial Weather StatementOUNGreer, Jackson34 min
May 31, 2:13 AM CDTSpecial Weather StatementOUNJackson32 min
May 31, 2:35 AM CDTSevere Thunderstorm WarningOUNComanche, Kiowa, Tillman40 min
May 31, 3:41 AM CDTSpecial Weather StatementOUNStephens34 min
May 31, 3:47 AM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Stephens21 min
May 31, 5:06 AM CDTSpecial Weather StatementOUNCleveland, Grady, McClain39 min
May 31, 12:58 AM CDTSpecial Weather StatementOUNHardeman32 min

Nearby

Special Weather Statements in Oklahoma, 2011Every special weather statement in 2011

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.