Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 116, NWS Norman, OK

May 11, 2018Beckham County, Roger Mills County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 11, 2018, 7:36 PM CDT for Beckham County, Roger Mills County, Oklahoma. It was in force for 39 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: May 11, 2018, 7:36 PM CDT (00:36 UTC)
Expired: May 11, 2018, 8:15 PM CDT
In force: 39 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Beckham County, OK, Roger Mills County, OK

The radar

The Altus AFB radar (KFDR), 140 km from the middle of the area, began a volume at 00:38 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, 0.6 hours before the alert went out and 184 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 4936 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 51 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

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 May 11, 6:43 PM CDT, 53 minutes earlier.

Area forecast discussion, May 11, 6:43 PM CDT, 53 minutes before

Area Forecast Discussion
National Weather Service Norman OK
643 PM CDT Fri May 11 2018

.DISCUSSION...
Please see the 00Z aviation discussion below.

&&

.AVIATION...
VFR will apply through the forecast period. Wind speeds will
decrease slightly after sunset. Mid to high clouds will increase
over central OK, thanks to smoke and a thunderstorm in the TX
panhandle. Some lower cigs around 035-050 are expected after 14Z.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  68  87  69  89 /   0   0   0   0
Hobart OK         68  93  70  92 /  10   0   0  20
Wichita Falls TX  68  91  70  91 /   0   0   0   0
Gage OK           69  96  68  94 /  10  10  10  30
Ponca City OK     70  90  69  92 /  10   0   0  10
Durant OK         69  85  68  88 /   0   0   0   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Wind Advisory until 7 PM CDT this evening for OKZ004>020-022>031-
     035-038.

TX...None.
&&

99/99/03

Hazardous weather outlook, May 11, 11:36 AM CDT, 8 hours before

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In the hours before

Special weather statement, May 11, 7:24 PM CDT, 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
724 PM CDT FRI MAY 11 2018

OKZ014-021-120045-
Roger Mills OK-Beckham OK-
724 PM CDT FRI MAY 11 2018

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Roger Mills and
northwestern Beckham Counties Until 745 PM CDT...

AT 719 PM CDT, severe thunderstorms were located in Wheeler County
Texas along a line extending from near Allison to north of Shamrock,
moving northeast at 35 MPH.

These thunderstorms will move into western Roger Mills and
northwestern Beckham Counties before 800 pm. Severe weather will be
possible with these storms if they maintain their current intensity.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the situation closely. Be ready to act quickly if a warning
is issued or if storms threaten you.

&&

LAT...LON 3574 10000 3587 9973 3585 9967 3528 9988
      3522 10000
TIME...MOT...LOC 0019Z 230DEG 32KT 3552 10012 3529 10024

..speg.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 7:24 PM CDT	Special Weather Statement	OUN	Roger Mills	21 min
May 11, 8:15 PM CDT	Severe Thunderstorm Warning	OUN	Roger Mills	26 min
May 11, 9:06 PM CDT	Special Weather Statement	OUN	Custer, Dewey	54 min
May 11, 9:36 PM CDT	High Wind Warning	OUN	Custer, Dewey, Washita	83 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018 Every severe thunderstorm warning in 2018

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.