Alert archive / Texas / Freeze Warnings in 2018

Freeze Warning 1, NWS Amarillo, TX

April 13, 201812 counties in Texas

NWS Amarillo, TX issued this freeze warning at Apr 13, 2018, 6:16 PM CDT for 12 counties in Texas. It took effect at Apr 13, 2018, 11:00 PM CDT. It was in force for 11 hr. 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 13, 2018, 6:16 PM CDT (23:16 UTC)
In effect from
Apr 13, 2018, 11:00 PM CDT
Expired
Apr 14, 2018, 10:00 AM CDT
In force
11 hr
Issued by
NWS Amarillo, TX

Counties Armstrong County, TX, Carson County, TX, Deaf Smith County, TX, Donley County, TX, Gray County, TX, Hemphill County, TX, Hutchinson County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 37 km from the middle of the area, began a volume at 23:17 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, 11.3 hours before the alert went out and 358 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 2018-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 960 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 2018-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 577 square meters per square second.1939587897Sfc1 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
960 J/kg
Mixed-layer CIN
-283 J/kg
Mixed-layer LCL
758 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
577 m²/s²
0-3 km storm-relative helicity
755 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Amarillo, TX wrote its last area forecast discussion before this freeze warning went out at Apr 13, 5:56 PM CDT, 20 minutes earlier.

Area forecast discussion, Apr 13, 5:56 PM CDT, 20 minutes before
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Hazardous weather outlook, Apr 13, 3:52 AM CDT, 14 hours 24 minutes before
Hazardous Weather Outlook
National Weather Service Amarillo TX
352 AM CDT Fri Apr 13 2018

OKZ001>003-TXZ001>020-132130-
Cimarron-Texas-Beaver-Dallam-Sherman-Hansford-Ochiltree-Lipscomb-
Hartley-Moore-Hutchinson-Roberts-Hemphill-Oldham-Potter-Carson-
Gray-Wheeler-Deaf Smith-Randall-Armstrong-Donley-Collingsworth-
352 AM CDT Fri Apr 13 2018

This Hazardous Weather Outlook is for the Texas and Oklahoma
Panhandles.

.DAY ONE...Today and Tonight.

Critical to extremely critical fire weather are expected today and
this evening across the southern half of the Texas Panhandle plus
the eastern one-third of the Combined Texas and Oklahoma
Panhandles due to strong southwest winds of 25 to 35 mph with
higher gusts and low relative humidity values less than 10
percent. A Red Flag Warning will be in effect for these areas
until 10 PM tonight.

In addition, Wind Advisories will be in effect today and tonight
for most of the Panhandles due to sustained winds around 35 mph
with higher gusts.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Elevated to critical fire weather conditions will be possible across
much of the region on Saturday, Monday, and Tuesday due to strong
winds and low relative humidity values.

Wind Advisories or High Wind Warnings may become necessary on
Saturday across much of the Oklahoma and Texas Panhandles due to
strong sustained winds of 35 to 40 mph with higher gusts. A High
Wind Watch will be in effect for the Oklahoma Panhandle on
Saturday.

Freezing temperatures or below are expected across most of the
area late tonight into Saturday morning, and then again late
Saturday night into Sunday morning. Freeze Watches and Freeze
Warnings may become necessary during these time periods.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

Area fire managers and emergency officials should be alert for
elevated to extremely critical fire weather conditions today and
Saturday, and for elevated to critical fire weather conditions
Monday and Tuesday.

Cockrell

The office that day

Everything else NWS Amarillo, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 13, 3:51 AM CDTFire Weather WatchAMAArmstrong, Carson, Collingsworth, Dallam, Deaf Smith, Donley and 14 more24 hr
Apr 13, 3:51 AM CDTRed Flag WarningAMAArmstrong, Carson, Collingsworth, Deaf Smith, Donley, Gray and 8 more14 hr
Apr 13, 3:52 AM CDTWind AdvisoryAMAArmstrong, Collingsworth, Dallam, Deaf Smith, Donley, Hansford and 6 more24 hr
Apr 13, 6:16 PM CDTHard Freeze WarningAMADallam, Hansford, Hartley, Lipscomb, Moore, Ochiltree and 1 more16 hr
Apr 13, 3:52 AM CDTHigh Wind WatchAMABeaver, Cimarron, Texas24 hr

Nearby

Freeze Warnings in Texas, 2018Every freeze 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.