Alert archive / Texas / Freeze Warnings in 2021

Freeze Warning 1, NWS Amarillo, TX

April 19, 20216 counties in Texas

NWS Amarillo, TX issued this freeze warning at Apr 19, 2021, 2:36 AM CDT for 6 counties in Texas. It took effect at Apr 20, 2021, 1:00 AM CDT. It was in force for 8 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 19, 2021, 2:36 AM CDT (07:36 UTC)
In effect from
Apr 20, 2021, 1:00 AM CDT
Expired
Apr 20, 2021, 9:00 AM CDT
In force
8 hr
Issued by
NWS Amarillo, TX

Counties Armstrong County, TX, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hemphill County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 98 km from the middle of the area, began a volume at 07:34 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, 7.6 hours before the alert went out and 97 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 2021-04-19Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 00:00Z on 2021-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 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
3111 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
14 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

188 
WWUS74 KAMA 190736
NPWAMA

URGENT - WEATHER MESSAGE
National Weather Service Amarillo TX
236 AM CDT Mon Apr 19 2021

OKZ001>003-TXZ001>009-011>013-016-017-317-191545-
/O.UPG.KAMA.FZ.A.0001.210420T0600Z-210420T1400Z/
/O.NEW.KAMA.HZ.W.0001.210420T0600Z-210420T1400Z/
Cimarron-Texas-Beaver-Dallam-Sherman-Hansford-Ochiltree-Lipscomb-
Hartley-Moore-Hutchinson-Roberts-Oldham-Potter-Carson-Deaf Smith-
Randall-Palo Duro Canyon-
Including the cities of Dalhart, Gruver, Borger, Amarillo,
Perryton, Palo Duro Canyon, Panhandle, Boise City, Higgins,
Miami, White Deer, Vega, Booker, Hereford, Keyes, Spearman,
Channing, Forgan, Dumas, Canyon, Stratford, Follett, Beaver,
Hartley, and Guymon
236 AM CDT Mon Apr 19 2021

...HARD FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM CDT TUESDAY...

* WHAT...Sub-freezing temperatures as low as 24 expected.

* WHERE...Portions of the Panhandle of Oklahoma. Portions of the 
  Panhandle of Texas.

* WHEN...From 1 AM to 9 AM CDT Tuesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

TXZ010-014-015-018>020-191545-
/O.UPG.KAMA.FZ.A.0001.210420T0600Z-210420T1400Z/
/O.NEW.KAMA.FZ.W.0001.210420T0600Z-210420T1400Z/
Hemphill-Gray-Wheeler-Armstrong-Donley-Collingsworth-
Including the cities of Canadian, Claude, Wheeler, Wellington,
Shamrock, Clarendon, and Pampa
236 AM CDT Mon Apr 19 2021

...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM CDT TUESDAY...

* WHAT...Sub-freezing temperatures as low as 28 expected.

* WHERE...Armstrong, Collingsworth, Donley, Gray, Hemphill and 
  Wheeler.

* WHEN...From 1 AM to 9 AM CDT Tuesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Guerrero
5 follow-up statements
686 
WWUS74 KAMA 190753
NPWAMA

URGENT - WEATHER MESSAGE
National Weather Service Amarillo TX
253 AM CDT Mon Apr 19 2021

TXZ001-002-006-007-011-012-016-017-317-191600-
/O.NEW.KAMA.WI.Y.0009.210420T0500Z-210420T1100Z/
/O.NEW.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
/O.CON.KAMA.HZ.W.0001.210420T0600Z-210420T1400Z/
Dallam-Sherman-Hartley-Moore-Oldham-Potter-Deaf Smith-Randall-
Palo Duro Canyon-
Including the cities of Channing, Dalhart, Palo Duro Canyon,
Dumas, Canyon, Vega, Stratford, Hereford, Amarillo, and Hartley
253 AM CDT Mon Apr 19 2021

...WIND ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM CDT 
TUESDAY...
...HARD FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT 
TUESDAY...
...FREEZE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY 
MORNING...

* WHAT...For the Wind Advisory, north winds 30 to 40 mph expected. 
  For the Freeze Watch, sub-freezing temperatures as low as 24 
  possible. For the Hard Freeze Warning, sub-freezing temperatures 
  as low as 24 expected.

* WHERE...Dallam, Deaf Smith, Hartley, Moore, Oldham, Palo Duro 
  Canyon, Potter, Randall and Sherman.

* WHEN...For the Wind Advisory, from Midnight tonight to 6 AM CDT 
  Tuesday. For the Freeze Watch, from late Tuesday night through 
  Wednesday morning. For the Hard Freeze Warning, from 1 AM to 9 AM 
  CDT Tuesday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. 
  Frost and freeze conditions could kill crops, other sensitive 
  vegetation and possibly damage unprotected outdoor plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Take steps now to protect tender plants from the cold.

&&

$$

OKZ001>003-TXZ003>005-008-009-013-191600-
/O.NEW.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
/O.CON.KAMA.HZ.W.0001.210420T0600Z-210420T1400Z/
Cimarron-Texas-Beaver-Hansford-Ochiltree-Lipscomb-Hutchinson-
Roberts-Carson-
Including the cities of Spearman, Forgan, Boise City, Higgins,
Gruver, Miami, White Deer, Borger, Perryton, Booker, Follett,
Keyes, Beaver, Panhandle, and Guymon
253 AM CDT Mon Apr 19 2021

...HARD FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT 
TUESDAY...
...FREEZE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY 
MORNING...

* WHAT...For the Freeze Watch, sub-freezing temperatures as low as 
  24 possible. For the Hard Freeze Warning, sub-freezing 
  temperatures as low as 24 expected.

* WHERE...In Oklahoma, Beaver, Cimarron and Texas. In Texas, Carson, 
  Hansford, Hutchinson, Lipscomb, Ochiltree and Roberts.

* WHEN...For the Freeze Watch, from late Tuesday night through 
  Wednesday morning. For the Hard Freeze Warning, from 1 AM to 9 AM 
  CDT Tuesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

TXZ010-014-015-018>020-191600-
/O.NEW.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
/O.CON.KAMA.FZ.W.0001.210420T0600Z-210420T1400Z/
Hemphill-Gray-Wheeler-Armstrong-Donley-Collingsworth-
Including the cities of Canadian, Claude, Wheeler, Wellington,
Shamrock, Clarendon, and Pampa
253 AM CDT Mon Apr 19 2021

...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT TUESDAY...
...FREEZE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY 
MORNING...

* WHAT...For the Freeze Watch, sub-freezing temperatures as low as 
  28 possible. For the Freeze Warning, sub-freezing temperatures as 
  low as 28 expected.

* WHERE...Armstrong, Collingsworth, Donley, Gray, Hemphill and 
  Wheeler.

* WHEN...For the Freeze Watch, from late Tuesday night through 
  Wednesday morning. For the Freeze Warning, from 1 AM to 9 AM CDT 
  Tuesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

MJG
859 
WWUS74 KAMA 191943
NPWAMA

URGENT - WEATHER MESSAGE
National Weather Service Amarillo TX
243 PM CDT Mon Apr 19 2021

TXZ001-002-006-007-011-012-016-017-317-200400-
/O.CON.KAMA.HZ.W.0001.210420T0600Z-210420T1400Z/
/O.CON.KAMA.WI.Y.0009.210420T0500Z-210420T1100Z/
/O.CON.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
Dallam-Sherman-Hartley-Moore-Oldham-Potter-Deaf Smith-Randall-
Palo Duro Canyon-
Including the cities of Channing, Dalhart, Palo Duro Canyon,
Dumas, Canyon, Vega, Stratford, Hereford, Amarillo, and Hartley
243 PM CDT Mon Apr 19 2021

...WIND ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM CDT 
TUESDAY...
...HARD FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT 
TUESDAY...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT THROUGH 
WEDNESDAY MORNING...

* WHAT...For the Hard Freeze Warning, temperatures of 28 degrees or 
  lower are expected. For the Wind Advisory, north winds of 35 mph 
  are expected. For the Freeze Watch, temperatures of 32 degrees or 
  lower are possible.

* WHERE...Dallam, Deaf Smith, Hartley, Moore, Oldham, Palo Duro 
  Canyon, Potter, Randall and Sherman.

* WHEN...For the Hard Freeze Warning, from 1 AM to 9 AM CDT Tuesday. 
  For the Wind Advisory, from Midnight tonight to 6 AM CDT Tuesday. 
  For the Freeze Watch, from late Tuesday night through Wednesday 
  morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing. Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

&&

$$

OKZ001>003-TXZ003>005-008-009-013-200400-
/O.CON.KAMA.HZ.W.0001.210420T0600Z-210420T1400Z/
/O.CON.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
Cimarron-Texas-Beaver-Hansford-Ochiltree-Lipscomb-Hutchinson-
Roberts-Carson-
Including the cities of Spearman, Forgan, Boise City, Higgins,
Gruver, Miami, White Deer, Borger, Perryton, Booker, Follett,
Keyes, Beaver, Panhandle, and Guymon
243 PM CDT Mon Apr 19 2021

...HARD FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT 
TUESDAY...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT THROUGH 
WEDNESDAY MORNING...

* WHAT...For the Hard Freeze Warning, temperatures of 28 degrees or 
  lower are expected. For the Freeze Watch, temperatures of 32 
  degrees or lower are possible.

* WHERE...In Oklahoma, Beaver, Cimarron and Texas. In Texas, Carson, 
  Hansford, Hutchinson, Lipscomb, Ochiltree and Roberts.

* WHEN...For the Hard Freeze Warning, from 1 AM to 9 AM CDT Tuesday. 
  For the Freeze Watch, from late Tuesday night through Wednesday 
  morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

TXZ010-014-015-018>020-200400-
/O.CON.KAMA.FZ.W.0001.210420T0600Z-210420T1400Z/
/O.CON.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
Hemphill-Gray-Wheeler-Armstrong-Donley-Collingsworth-
Including the cities of Canadian, Claude, Wheeler, Wellington,
Shamrock, Clarendon, and Pampa
243 PM CDT Mon Apr 19 2021

...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT TUESDAY...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT THROUGH 
WEDNESDAY MORNING...

* WHAT...For the Freeze Warning, temperatures between 32 and 29 
  degrees are expected. For the Freeze Watch, temperatures of 32 
  degrees or lower are possible.

* WHERE...Armstrong, Collingsworth, Donley, Gray, Hemphill and 
  Wheeler.

* WHEN...For the Freeze Warning, from 1 AM to 9 AM CDT Tuesday. For 
  the Freeze Watch, from late Tuesday night through Wednesday 
  morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Beat
844 
WWUS74 KAMA 200349
NPWAMA

URGENT - WEATHER MESSAGE
National Weather Service Amarillo TX
1049 PM CDT Mon Apr 19 2021

TXZ001-002-006-007-011-012-016-017-317-201200-
/O.CON.KAMA.HZ.W.0001.210420T0600Z-210420T1400Z/
/O.CON.KAMA.WI.Y.0009.210420T0500Z-210420T1100Z/
/O.CON.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
Dallam-Sherman-Hartley-Moore-Oldham-Potter-Deaf Smith-Randall-
Palo Duro Canyon-
Including the cities of Channing, Dalhart, Palo Duro Canyon,
Dumas, Canyon, Vega, Stratford, Hereford, Amarillo, and Hartley
1049 PM CDT Mon Apr 19 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM CDT TUESDAY...
...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT TUESDAY...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT THROUGH 
WEDNESDAY MORNING...

* WHAT...For the Hard Freeze Warning, sub-freezing temperatures as 
  low as 24 expected. For the Wind Advisory, northeast winds 25 to 
  35 mph expected. For the Freeze Watch, sub-freezing temperatures 
  as low as 27 possible.

* WHERE...Dallam, Deaf Smith, Hartley, Moore, Oldham, Palo Duro 
  Canyon, Potter, Randall and Sherman.

* WHEN...For the Hard Freeze Warning, until 9 AM CDT Tuesday. For 
  the Wind Advisory, until 6 AM CDT Tuesday. For the Freeze Watch, 
  from late Tuesday night through Wednesday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing. Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

&&

$$

OKZ001>003-TXZ003>005-008-009-013-201200-
/O.CON.KAMA.HZ.W.0001.210420T0600Z-210420T1400Z/
/O.CON.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
Cimarron-Texas-Beaver-Hansford-Ochiltree-Lipscomb-Hutchinson-
Roberts-Carson-
Including the cities of Spearman, Forgan, Boise City, Higgins,
Gruver, Miami, White Deer, Borger, Perryton, Booker, Follett,
Keyes, Beaver, Panhandle, and Guymon
1049 PM CDT Mon Apr 19 2021

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT TUESDAY...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT THROUGH 
WEDNESDAY MORNING...

* WHAT...For the Hard Freeze Warning, sub-freezing temperatures as 
  low as 24 expected. For the Freeze Watch, sub-freezing 
  temperatures as low as 28 possible.

* WHERE...In Oklahoma, Beaver, Cimarron and Texas. In Texas, Carson, 
  Hansford, Hutchinson, Lipscomb, Ochiltree and Roberts.

* WHEN...For the Hard Freeze Warning, until 9 AM CDT Tuesday. For 
  the Freeze Watch, from late Tuesday night through Wednesday 
  morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

TXZ010-014-015-018>020-201200-
/O.CON.KAMA.FZ.W.0001.210420T0600Z-210420T1400Z/
/O.CON.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
Hemphill-Gray-Wheeler-Armstrong-Donley-Collingsworth-
Including the cities of Canadian, Claude, Wheeler, Wellington,
Shamrock, Clarendon, and Pampa
1049 PM CDT Mon Apr 19 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT TUESDAY...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT THROUGH 
WEDNESDAY MORNING...

* WHAT...For the Freeze Warning, sub-freezing temperatures as low as 
  28 expected. For the Freeze Watch, sub-freezing temperatures as 
  low as 29 possible.

* WHERE...Armstrong, Collingsworth, Donley, Gray, Hemphill and 
  Wheeler.

* WHEN...For the Freeze Warning, until 9 AM CDT Tuesday. For the 
  Freeze Watch, from late Tuesday night through Wednesday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Rutt
997 
WWUS74 KAMA 200738
NPWAMA

URGENT - WEATHER MESSAGE
National Weather Service Amarillo TX
238 AM CDT Tue Apr 20 2021

TXZ001-002-006-007-011-012-016-017-317-201545-
/O.UPG.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
/O.NEW.KAMA.HZ.W.0002.210421T0500Z-210421T1400Z/
/O.CON.KAMA.HZ.W.0001.000000T0000Z-210420T1400Z/
/O.CON.KAMA.WI.Y.0009.000000T0000Z-210420T1100Z/
Dallam-Sherman-Hartley-Moore-Oldham-Potter-Deaf Smith-Randall-
Palo Duro Canyon-
Including the cities of Channing, Dalhart, Palo Duro Canyon,
Dumas, Canyon, Vega, Stratford, Hereford, Amarillo, and Hartley
238 AM CDT Tue Apr 20 2021

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS 
MORNING...
...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM CDT EARLY THIS 
MORNING...
...HARD FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT 
WEDNESDAY...

* WHAT...For this morning's Hard Freeze Warning, sub-freezing 
  temperatures as low as 22 expected. For tonight's Hard Freeze 
  Warning, sub-freezing temperatures as low as 23. For this 
  morning's Wind Advisory, northeast winds 25 to 35 mph.

* WHERE...Dallam, Deaf Smith, Hartley, Moore, Oldham, Palo Duro 
  Canyon, Potter, Randall and Sherman.

* WHEN...For this morning's Hard Freeze Warning, until 9 AM CDT. For 
  this morning's Wind Advisory, until 6 AM CDT. For tonight's Hard 
  Freeze Warning, from midnight tonight to 9 AM CDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing. Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

&&

$$

OKZ001>003-TXZ003>005-008-009-013-201545-
/O.UPG.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
/O.NEW.KAMA.HZ.W.0002.210421T0500Z-210421T1400Z/
/O.CON.KAMA.HZ.W.0001.000000T0000Z-210420T1400Z/
Cimarron-Texas-Beaver-Hansford-Ochiltree-Lipscomb-Hutchinson-
Roberts-Carson-
Including the cities of Spearman, Forgan, Boise City, Higgins,
Gruver, Miami, White Deer, Borger, Perryton, Booker, Follett,
Keyes, Beaver, Panhandle, and Guymon
238 AM CDT Tue Apr 20 2021

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS 
MORNING...
...HARD FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT 
WEDNESDAY...

* WHAT...For this morning's Hard Freeze Warning, sub-freezing 
  temperatures as low as 26 expected. For tonight's Hard Freeze 
  Warning, sub-freezing temperatures as low as 24.

* WHERE...In Oklahoma, Beaver, Cimarron and Texas. In Texas, Carson, 
  Hansford, Hutchinson, Lipscomb, Ochiltree and Roberts.

* WHEN...For this morning's Hard Freeze Warning, until 9 AM CDT this 
  morning. For tonight's Hard Freeze Warning, from midnight tonight 
  to 9 AM CDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

TXZ010-014-201545-
/O.UPG.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
/O.NEW.KAMA.HZ.W.0002.210421T0500Z-210421T1400Z/
/O.CON.KAMA.FZ.W.0001.000000T0000Z-210420T1400Z/
Hemphill-Gray-
Including the cities of Pampa and Canadian
238 AM CDT Tue Apr 20 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING...
...HARD FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT 
WEDNESDAY...

* WHAT...For this morning's Freeze Warning, sub-freezing 
  temperatures as low as 27. For tonight's Hard Freeze Warning, 
  sub-freezing temperatures as low as 25 expected.

* WHERE...Gray and Hemphill.

* WHEN...For the Hard Freeze Warning, from Midnight tonight to 9 AM 
  CDT Wednesday. For the Freeze Warning, until 9 AM CDT this morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

TXZ015-018>020-201545-
/O.UPG.KAMA.FZ.A.0002.210421T0600Z-210421T1400Z/
/O.NEW.KAMA.FZ.W.0002.210421T0500Z-210421T1400Z/
/O.CON.KAMA.FZ.W.0001.000000T0000Z-210420T1400Z/
Wheeler-Armstrong-Donley-Collingsworth-
Including the cities of Shamrock, Claude, Wheeler, Wellington,
and Clarendon
238 AM CDT Tue Apr 20 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING...
...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT 
WEDNESDAY...

* WHAT...For this morning's Freeze Warning, sub-freezing 
  temperatures as low as 27 expected. For tonight's Freeze Warning, 
  sub-freezing temperatures as low as 29.

* WHERE...Armstrong, Collingsworth, Donley and Wheeler.

* WHEN...For this morning's Freeze Warning, until 9 AM CDT this 
  morning. For tonight's Freeze Warning, from Midnight tonight to 9 
  AM CDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Guerrero
518 
WWUS74 KAMA 201404
NPWAMA

URGENT - WEATHER MESSAGE
National Weather Service Amarillo TX
904 AM CDT Tue Apr 20 2021

OKZ001>003-TXZ001>009-011>013-016-017-317-202215-
/O.EXP.KAMA.HZ.W.0001.000000T0000Z-210420T1400Z/
/O.CON.KAMA.HZ.W.0002.210421T0500Z-210421T1400Z/
Cimarron-Texas-Beaver-Dallam-Sherman-Hansford-Ochiltree-Lipscomb-
Hartley-Moore-Hutchinson-Roberts-Oldham-Potter-Carson-Deaf Smith-
Randall-Palo Duro Canyon-
Including the cities of Dalhart, Gruver, Borger, Amarillo,
Perryton, Palo Duro Canyon, Panhandle, Boise City, Higgins,
Miami, White Deer, Vega, Booker, Hereford, Keyes, Spearman,
Channing, Forgan, Dumas, Canyon, Stratford, Follett, Beaver,
Hartley, and Guymon
904 AM CDT Tue Apr 20 2021

...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 
AM CDT WEDNESDAY...
...HARD FREEZE WARNING HAS EXPIRED...

* WHAT...Temperatures of 28 degrees or lower are expected.

* WHERE...All of the Oklahoma Panhandle and portions of the Texas 
  Panhandle.

* WHEN...From Midnight tonight to 9 AM CDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

TXZ010-014-202215-
/O.EXP.KAMA.FZ.W.0001.000000T0000Z-210420T1400Z/
/O.CON.KAMA.HZ.W.0002.210421T0500Z-210421T1400Z/
Hemphill-Gray-
Including the cities of Pampa and Canadian
904 AM CDT Tue Apr 20 2021

...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 
AM CDT WEDNESDAY...
...FREEZE WARNING HAS EXPIRED...

* WHAT...Temperatures of 28 degrees or lower are expected.

* WHERE...Gray and Hemphill.

* WHEN...From Midnight tonight to 9 AM CDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

TXZ015-018>020-202215-
/O.EXP.KAMA.FZ.W.0001.000000T0000Z-210420T1400Z/
/O.CON.KAMA.FZ.W.0002.210421T0500Z-210421T1400Z/
Wheeler-Armstrong-Donley-Collingsworth-
Including the cities of Shamrock, Claude, Wheeler, Wellington,
and Clarendon
904 AM CDT Tue Apr 20 2021

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM 
CDT WEDNESDAY...
...FREEZE WARNING HAS EXPIRED...

* WHAT...Temperatures between 29 and 32 degrees are expected.

* WHERE...Armstrong, Collingsworth, Donley and Wheeler.

* WHEN...From Midnight tonight to 9 AM CDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Beat

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 19, 12:08 AM CDT, 2 hours 28 minutes earlier.

Area forecast discussion, Apr 19, 12:08 AM CDT, 2 hours 28 minutes before
Area Forecast Discussion
National Weather Service Amarillo TX
1208 AM CDT Mon Apr 19 2021

.AVIATION...

For the 06z TAFs:

VFR conditions will persist through the first three quarters of
this cycle. A cold front will come through Monday evening which
will bring breezy/windy conditions and a sharp wind shift.
Deteriorating flying conditions will also develop as ceilings
likely drop to MVFR for KDHT and KGUY. KAMA will not go MVFR until
the next set of TAFs as it will be too far south ahead of the
front for this cycle. There will also be a chance for drizzle and
freezing drizzle as the front passes.

Guerrero

&&

.PREV DISCUSSION... /Issued 253 PM CDT Sun Apr 18 2021/

SHORT TERM...Tonight through Tomorrow Night...

Latest WV imagery reveals our next upper level trough digging
south out of western and central Canada. This system has a decent
amount of moisture with it based on the expansive area of cool
cloud tops moving southeast through portions of MT and ND.
However, the latest guidance keeps the bulk of this moisture north
of the Panhandles as the much drier system currently over AZ
moves up ahead of the Canadian system, keeping most of its dynamic
influence in the central plains (although the southern jet streak
will clip our northern zones Monday night). At the surface, a
very cold airmass is making its move south into MT and ND at this
time. Sub freezing conditions were noted across southern Alberta
and Saskatchewan. This air will be entering our northern zones as
early as tomorrow evening, and should be clearing our southern
zones by 09z Tuesday (if not earlier). Given the strong CAA and
large density difference that will be associated with this cold
front, it will likely be faster than what most guidance suggest.
Have utilized the HRRR output for timing which was a few hours
faster than the lower resolution models. Wind speeds are also
going to be a concern behind the front Monday night given pressure
rises on the order of 3 to 4 mb/hr (strongest on the Caprock).
The GFS and CMC also indicate a strong 850mb jet of 40 to near 50
knots just behind the front. These 850mb winds will be capable of
mixing to the surface for an hour or two behind the front given
how strong the cold air advection is expected to be. Thus
sustained winds of 30 to 40 mph will be possible, along with wind
gusts near 50 to 60 mph. Wind headlines for Monday night will
probably be needed in upcoming shifts.

As for winter precipitation, accumulations are looking less and
less. This is mostly due to the fact that the best lift and
moisture is progged to stay to our north. Some 700mb
frontogenesis does moves through the area, but it is transient and
doesn't have much moisture to work with. Forecast soundings hint
at potential for some brief and very light freezing drizzle (if
the dry air right off the surface can be overcome) due to
saturation of supercooled air in the lowest 100mb or so. This
saturated low level air may get cold enough (-8 to -10 deg C) for
some light snow flurries mainly after 06z as far south as
Amarillo. This could be enhanced some by the Canadian River
Effect given the strong north winds. The far northern zones may
see a brief period of saturated DGZs, but there is also a pocket
of dry mid level air showing up in the NAM soundings that won't be
good for snow accumulations. The GFS is still on board with up to
0.5" of snow in portions of the northern OK Panhandle, as it does
not show the pocket of dry mid level air. Either way, it looks
like impacts will be more from cold and windy conditions than
winter precip, and any accumulations would be mainly limited to
the far northern zones. Can't rule out some light icing on wind
shields and elevated surfaces with any brief freezing drizzle, but
not expecting impacts to travel.

Speaking of cold, temperatures will certainly fall below freezing
across most of the area before sunrise Tuesday morning. As a
matter of fact, our current forecast brings Amarillo down below
freezing by 06z Tuesday. Will continue the Freeze Watch and expand
it to include all zones. Combine mid 20s to low 30s temperatures
with strong north winds and we end up with wind chill values in
the teens and even some single digits.

Ward

LONG TERM...Tuesday through Saturday night...

Large upper level troughing pattern continues through Tuesday
morning, then starts to break down with slight H2 height rises
going into Thursday evening allowing for temperatures to warm.
Thursday night into Friday an H5 positively tilted trough will
approach the FA bringing slight chance for precipitation in the
far eastern FA. Friday night another surface cold front will move
in from the north as the mid to upper level shortwave axis
traverses the Panhandles. A mid to upper level ridge will build in
Saturday night into Sunday as the trough exits the region
possibly bringing well above normal temperatures out past the
extended period.

One key topic for Tuesday will be the well below freezing
temperatures to start out the day on Tuesday. This combined with
strong northerly winds behind a front around 20 to 25 mph will
keep daytime temperatures held back well below normal Tuesday
afternoon. The winds and gusts will gradually decrease going into
the late afternoon as the pressure gradient relaxes both at the
surface and H85. Daytime temperatures are looking to only reach
the upper 40s to lower 50s. This will be around 20 degrees below
normal. Light winds and clear skies Tuesday night may lead to
below freezing temperatures across the majority of the area
Wednesday morning as well.

For Wednesday, temperatures will only be slightly warmer with
daytime highs in the upper 50s to lower 60s. Even though cloud
cover will increase early Wednesday winds will pick up out of the
south to help warm to these temperatures. Overnight Wednesday into
Thursday most of the area should remain in the mid 30s or just
above freezing with the exception of the for northwest FA.
Thursday a LLTR will build in over New Mexico with its eastern
edge over the far western CWA. This will cause H85 temperatures to
be 10C degrees warmer over the western Panhandles than the
eastern Panhandles. Also, an surface trough will build into the
west bringing drier air. This will cause daytime temperatures to
warm into the mid 60s in the far western FA and only mid to upper
50s in the eastern FA regardless of clear skies and southerly
winds. By Friday the LLTR will propagate east encompassing more of
the FA and bringing daytime temperatures into the upper 60s to
70s.

Friday is also when the next mid to upper level shortwave troughs
moves in from the west. Chances for precipitation with this next
system look to be limited to the far eastern Panhandles into
western Oklahoma. There are some differences in the models at this
time, as the GFS is showing a more westward extent for PoPs. This
is due to a dryline type feature forming as the gradient steepens
from dewpoints in the 20s to 30s west of this boundary and 40 to
50 dewpoints east of the boundary. The previous 06Z run of the GFS
had this feature much more of a true dryline with a triple point
in the north central FA. The new 00Z GFS has a good axis of
theta-e advection at H7 over the eastern two stacks of counties in
the Texas Panhandle. The EC and Canadian have this axis further
east impacting more of western Oklahoma. Have stuck with the NBM
PoPs for now until there is further agreement between the models.
Even if the GFS is right, there will be much cooler H85
temperatures on the moist side of the pseudo dryline. This will
most likely create an inversion at H7 capping off any surface
based convection limiting severe storms.

The cold front of the pseudo triple point will move through
sometime in the afternoon into evening Friday. According to the
NBM, temperatures on Saturday could return to the low 70s as
winds quickly return to an east-southeast direction. The GFS does
show northerly winds all day on Saturday. If this were to be the
case, daytime temperatures on Saturday could end up being cooler.
But overall it looks like a warming trend could be occurring into
the weekend bringing well above normal temperatures in the 80s out
past day 7.

Hoffeditz

&&

.AMA Watches/Warnings/Advisories...
TX...Freeze Watch from late tonight through Tuesday morning for the
     following zones: Armstrong...Carson...Collingsworth...
     Dallam...Deaf Smith...Donley...Gray...Hansford...Hartley...
     Hemphill...Hutchinson...Lipscomb...Moore...Ochiltree...
     Oldham...Palo Duro Canyon...Potter...Randall...Roberts...
     Sherman...Wheeler.

OK...Freeze Watch from late tonight through Tuesday morning for the
     following zones: Beaver...Cimarron...Texas.

&&

99/99
Hazardous weather outlook, Apr 18, 2:16 PM CDT, 12 hours 20 minutes before
Hazardous Weather Outlook
National Weather Service Amarillo TX
216 PM CDT Sun Apr 18 2021

OKZ001>003-TXZ001>020-317-191100-
Cimarron-Texas-Beaver-Dallam-Sherman-Hansford-Ochiltree-Lipscomb-
Hartley-Moore-Hutchinson-Roberts-Hemphill-Oldham-Potter-Carson-
Gray-Wheeler-Deaf Smith-Randall-Armstrong-Donley-Collingsworth-
Palo Duro Canyon-
216 PM CDT Sun Apr 18 2021

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

.DAY ONE...The rest of Tonight.

Widespread hazardous weather is not expected.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Light snow will be possible Monday night mainly in the Oklahoma
Panhandle and northern Texas Panhandle. Some limited impacts are
possible.

Temperatures will drop below freezing Monday night, and a freeze
watch is in effect as temperatures are forecasted drop down to 22
to 32 degrees across the area.

Thunderstorms will be possible Friday afternoon across the far
eastern portions of the Oklahoma and Texas Panhandles. Any storms
that develop are forecast to remain below severe levels at this
time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 2:36 AM CDTHard Freeze WarningAMACarson, Dallam, Deaf Smith, Hansford, Hartley, Hutchinson and 8 more30 hr
Apr 19, 2:53 AM CDTFreeze WatchAMAArmstrong, Carson, Collingsworth, Dallam, Deaf Smith, Donley and 14 more24 hr
Apr 19, 2:53 AM CDTWind AdvisoryAMADallam, Deaf Smith, Hartley, Moore, Oldham, Potter and 2 more27 hr

Nearby

Freeze Warnings in Texas, 2021Every freeze warning in 2021

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.