Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 50, NWS Norman, OK

April 3, 2019Harmon County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 3, 2019, 6:23 PM CDT for Harmon County, Oklahoma. It was in force for 52 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
Apr 3, 2019, 6:23 PM CDT (23:23 UTC)
Expired
Apr 3, 2019, 7:15 PM CDT
In force
52 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.75 in
Wind
60.0 mph

County Harmon County, OK

The radar

The Altus AFB radar (KFDR), 90 km from the middle of the area, began a volume at 23:26 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
Apr 3, 3:47 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.4 hours before the alert went out and 177 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 12:00Z on 2019-04-03Temperature 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 12:00Z on 2019-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 309 square meters per square second.19395878Sfc1 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
2302 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
309 m²/s²
0-3 km storm-relative helicity
314 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 Apr 3, 2:39 PM CDT, 3 hours 44 minutes earlier.

Area forecast discussion, Apr 3, 2:39 PM CDT, 3 hours 44 minutes before
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Hazardous weather outlook, Apr 3, 11:39 AM CDT, 6 hours 44 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1139 AM CDT Wed Apr 3 2019

OKZ004>048-050>052-TXZ083>090-041645-
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-
1139 AM CDT Wed Apr 3 2019

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...Through Tonight...

.Thunderstorms...
A few thunderstorms could develop near a dryline late this
afternoon and early evening in parts of western Oklahoma and
western north Texas. A cap and lack of rich moisture will make it
difficult for storms to develop. However, lift from the dryline
and an approaching system may be enough for a few storms to
develop. If storms develop, there is a Slight Risk of severe
storms in this area with large hail up to the size of golf balls
the primary hazard.

Showers and scattered thunderstorms are expected to increase in
coverage and spread east this evening and overnight. Some of these
storms could become strong to severe with hail up to the size of
quarters the main concern.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across
much of Oklahoma and western north Texas should prepare for
severe weather operations late this afternoon through the
overnight hours.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

.Thunderstorms...
Lingering showers and some thunderstorms will be possible through
Thursday morning. However, rain chances will be ending from west
to east across the area.

Showers and thunderstorms chances will return Friday night and
continue into the weekend. A few strong to severe storms may be
possible Friday evening in parts of western north Texas.
Otherwise, the chance of severe weather appears low at this time.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

In the hours before

Special weather statement, Apr 3, 5:55 PM CDT, 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
555 PM CDT WED APR 3 2019

OKZ033-032330-
Harmon OK-
555 PM CDT WED APR 3 2019

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Harmon County Until
630 PM CDT....

AT 555 PM CDT, a severe thunderstorm was located 12 miles southwest
of Wellington Texas, moving east at 40 MPH. If this storm maintains
it's current intensity, a severe thunderstorm warning will be needed
for Harmon County before 630 PM. Residents near Hollis and across
Harmon County should prepare for this severe thunderstorm.

HAZARDS INCLUDE...
Hail up to the size of golf balls...
Wind gusts over 50 MPH...

LAT...LON 3482 10000 3484 9983 3458 9980 3458 10000
TIME...MOT...LOC 2251Z 266DEG 36KT 3469 10030

..speg.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 3, 5:55 PM CDTSpecial Weather StatementOUNHarmon35 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2019Every severe thunderstorm warning in 2019

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.