Alert archive / California / Frost Advisories in 2022

Frost Advisory 21, NWS Eureka, CA

April 16, 2022Humboldt County, California

NWS Eureka, CA issued this frost advisory at Apr 16, 2022, 2:09 PM PDT for Humboldt County, California. It took effect at Apr 17, 2022, 12:00 AM PDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Apr 16, 2022, 2:09 PM PDT (21:09 UTC)
In effect from
Apr 17, 2022, 12:00 AM PDT
Expired
Apr 17, 2022, 9:00 AM PDT
In force
9 hr
Issued by
NWS Eureka, CA

County Humboldt County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 39 km from the middle of the area, began a volume at 21:11 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 9.2 hours before the alert went out and 207 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, Medford/Jackson, OR at 12:00Z on 2022-04-16Temperature 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, Medford/Jackson, OR at 12:00Z on 2022-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 square meters per square second.1939587897117Sfc1 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
497 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

887 
WWUS76 KEKA 162109
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
209 PM PDT Sat Apr 16 2022

CAZ106>111-114-170500-
/O.UPG.KEKA.HZ.A.0006.220417T0700Z-220417T1600Z/
/O.NEW.KEKA.HZ.W.0010.220417T0700Z-220417T1600Z/
Southern Humboldt Interior-Northern Trinity-Southern Trinity-
Mendocino Coast-Northwestern Mendocino Interior-
Northeastern Mendocino Interior-Northern Lake-
209 PM PDT Sat Apr 16 2022

...HARD FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM
SUNDAY...

* WHAT...Sub-freezing temperatures as low as 25 expected.

* WHERE...Southern Humboldt Interior, Trinity County, Mendocino 
  Coast, Northwestern Mendocino Interior, Northeastern Mendocino 
  Interior, and Northern Lake Counties.

* WHEN...From midnight tonight to 9 AM Sunday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those who have in-
ground sprinkler systems should drain them and cover above- ground 
pipes to protect them from freezing.

$$

CAZ102-104-105-112-113-115-170500-
/O.UPG.KEKA.FZ.A.0006.220417T0700Z-220417T1600Z/
/O.NEW.KEKA.FZ.W.0014.220417T0700Z-220417T1600Z/
Del Norte Interior-Southwestern Humboldt-
Northern Humboldt Interior-Southwestern Mendocino Interior-
Southeastern Mendocino Interior-Southern Lake-
209 PM PDT Sat Apr 16 2022

...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM SUNDAY...

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

* WHERE...Del Norte Interior, Southwestern Humboldt, Northern
  Humboldt Interior, Southwestern Mendocino Interior, Southeastern
  Mendocino Interior, and Southern Lake County.

* WHEN...From midnight tonight to 9 AM Sunday.

* IMPACTS...Frost and freeze conditions will kill crops and other
  sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Provide
adequate shelter for outdoor pets or consider bringing them
indoors.

$$

CAZ103-170500-
/O.NEW.KEKA.FR.Y.0021.220417T0700Z-220417T1600Z/
Northern Humboldt Coast-
209 PM PDT Sat Apr 16 2022

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM SUNDAY...

* WHAT...Temperatures as low as 34 will result in frost formation.

* WHERE...Northern Humboldt Coast County.

* WHEN...From midnight tonight to 9 AM Sunday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if left
  uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

$$
4 follow-up statements
932 
WWUS76 KEKA 170505
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
1005 PM PDT Sat Apr 16 2022

CAZ109-171600-
/O.CAN.KEKA.HZ.W.0010.220417T0700Z-220417T1600Z/
/O.EXA.KEKA.FZ.W.0014.220417T0700Z-220417T1600Z/
Mendocino Coast-
1005 PM PDT Sat Apr 16 2022

...FREEZE WARNING IN EFFECT UNTIL 9 AM PDT SUNDAY...
...HARD FREEZE WARNING IS CANCELLED...

* WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...The coldest inland valley locations in northern portions
  of the Mendocino Coast.

* WHEN...Until 9 AM PDT Sunday.

* IMPACTS...Frost and freeze conditions will kill crops and other
  sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Provide
adequate shelter for outdoor pets or consider bringing them
indoors.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ106>108-110-111-114-171600-
/O.CON.KEKA.HZ.W.0010.220417T0700Z-220417T1600Z/
Southern Humboldt Interior-Northern Trinity-Southern Trinity-
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Northern Lake-
1005 PM PDT Sat Apr 16 2022

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT SUNDAY...

* WHAT...Sub-freezing temperatures as low as 25 expected.

* WHERE...Colder valley locations in Southern Trinity, 
  Northeastern Mendocino Interior, Northern Trinity, Southern 
  Humboldt Interior, Northern Lake and Northwestern Mendocino 
  Interior Counties.

* WHEN...Until 9 AM PDT Sunday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ102-104-105-112-113-115-171600-
/O.CON.KEKA.FZ.W.0014.220417T0700Z-220417T1600Z/
Del Norte Interior-Southwestern Humboldt-
Northern Humboldt Interior-Southwestern Mendocino Interior-
Southeastern Mendocino Interior-Southern Lake-
1005 PM PDT Sat Apr 16 2022

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT SUNDAY...

* WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...Sheltered valleys through the Del Norte Interior, 
  Southwestern Mendocino Interior, Southeastern Mendocino 
  Interior, Northern Humboldt Interior, Southwestern Humboldt and 
  Southern Lake Counties.

* WHEN...Until 9 AM PDT Sunday.

* IMPACTS...Frost and freeze conditions will kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Provide
adequate shelter for outdoor pets or consider bringing them
indoors.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ103-171600-
/O.CON.KEKA.FR.Y.0021.220417T0700Z-220417T1600Z/
Northern Humboldt Coast-
1005 PM PDT Sat Apr 16 2022

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT SUNDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

* WHERE...Northern Humboldt Coast County.

* WHEN...Until 9 AM PDT Sunday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$
076 
WWUS76 KEKA 170908
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
208 AM PDT Sun Apr 17 2022

CAZ106-107-171715-
/O.NEW.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
/O.CON.KEKA.HZ.W.0010.000000T0000Z-220417T1600Z/
Southern Humboldt Interior-Northern Trinity-
208 AM PDT Sun Apr 17 2022

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS
MORNING...
...WIND ADVISORY IN EFFECT FROM 8 AM TO 2 PM PDT MONDAY...

* WHAT...For the Hard Freeze Warning, sub-freezing temperatures 
  as low as 23. For the Wind Advisory, south winds 15 to 25 mph 
  with gusts up to 50 mph expected.

* WHERE...Southern Humboldt Interior and Northern Trinity 
  Counties.

* WHEN...For the Hard Freeze Warning, until 9 AM PDT this 
  morning. For the Wind Advisory, from 8 AM to 2 PM PDT Monday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ102-104-105-171715-
/O.NEW.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
/O.CON.KEKA.FZ.W.0014.000000T0000Z-220417T1600Z/
Del Norte Interior-Southwestern Humboldt-
Northern Humboldt Interior-
208 AM PDT Sun Apr 17 2022

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...
...WIND ADVISORY IN EFFECT FROM 8 AM TO 2 PM PDT MONDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 29. For the Wind Advisory, south winds 20 to 30 mph 
  with gusts up to 55 mph expected.

* WHERE...Del Norte Interior, Southwestern Humboldt and Northern 
  Humboldt Interior Counties.

* WHEN...For the Freeze Warning, until 9 AM PDT this morning. 
  For the Wind Advisory, from 8 AM to 2 PM PDT Monday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold. Provide
adequate shelter for outdoor pets or consider bringing them
indoors.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ108-110-111-114-171600-
/O.CON.KEKA.HZ.W.0010.000000T0000Z-220417T1600Z/
Southern Trinity-Northwestern Mendocino Interior-
Northeastern Mendocino Interior-Northern Lake-
208 AM PDT Sun Apr 17 2022

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS
MORNING...

* WHAT...Sub-freezing temperatures as low as 25.

* WHERE...Southern Trinity, Northeastern Mendocino Interior, 
  Northern Lake and Northwestern Mendocino Interior Counties.

* WHEN...Until 9 AM PDT this morning.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ109-112-113-115-171600-
/O.CON.KEKA.FZ.W.0014.000000T0000Z-220417T1600Z/
Mendocino Coast-Southwestern Mendocino Interior-
Southeastern Mendocino Interior-Southern Lake-
208 AM PDT Sun Apr 17 2022

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 31.

* WHERE...Mendocino Coast, Southeastern Mendocino Interior, 
  Southwestern Mendocino Interior and Southern Lake Counties.

* WHEN...Until 9 AM PDT this morning.

* IMPACTS...Frost and freeze conditions will kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Provide
adequate shelter for outdoor pets or consider bringing them
indoors.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ103-171715-
/O.NEW.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
/O.CON.KEKA.FR.Y.0021.000000T0000Z-220417T1600Z/
Northern Humboldt Coast-
208 AM PDT Sun Apr 17 2022

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...
...WIND ADVISORY IN EFFECT FROM 8 AM TO 2 PM PDT MONDAY...

* WHAT...For the Frost Advisory, temperatures as low as 34 will 
  result in frost formation. For the Wind Advisory, southeast 
  winds 15 to 25 mph with gusts up to 50 mph expected.

* WHERE...Northern Humboldt Coast County.

* WHEN...For the Frost Advisory, until 9 AM PDT this morning. 
  For the Wind Advisory, from 8 AM to 2 PM PDT Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.
  Frost could kill sensitive outdoor vegetation if left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ101-171715-
/O.NEW.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
Coastal Del Norte-
208 AM PDT Sun Apr 17 2022

...WIND ADVISORY IN EFFECT FROM 8 AM TO 2 PM PDT MONDAY...

* WHAT...South winds 15 to 25 mph with gusts up to 50 mph 
  expected.

* WHERE...Coastal Del Norte County.

* WHEN...From 8 AM to 2 PM PDT Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
924 
WWUS76 KEKA 171321
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
621 AM PDT Sun Apr 17 2022

CAZ106-107-172130-
/O.CON.KEKA.HZ.W.0010.000000T0000Z-220417T1600Z/
/O.CON.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
Southern Humboldt Interior-Northern Trinity-
621 AM PDT Sun Apr 17 2022

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS
MORNING...
...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM TO 2 PM PDT MONDAY...

* WHAT...For the Hard Freeze Warning, sub-freezing temperatures 
  as low as 23. For the Wind Advisory, south winds 15 to 25 mph 
  with gusts up to 50 mph expected.

* WHERE...Northern Trinity and Southern Humboldt Interior 
  Counties.

* WHEN...For the Hard Freeze Warning, until 9 AM PDT this 
  morning. For the Wind Advisory, from 8 AM to 2 PM PDT Monday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ102-104-105-172130-
/O.CON.KEKA.FZ.W.0014.000000T0000Z-220417T1600Z/
/O.CON.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
Del Norte Interior-Southwestern Humboldt-
Northern Humboldt Interior-
621 AM PDT Sun Apr 17 2022

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...
...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM TO 2 PM PDT MONDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as low
  as 30. For the Wind Advisory, south winds 20 to 30 mph with 
  gusts up to 55 mph expected.

* WHERE...Del Norte Interior, Northern Humboldt Interior and 
  Southwestern Humboldt Counties.

* WHEN...For the Freeze Warning, until 9 AM PDT this morning. 
  For the Wind Advisory, from 8 AM to 2 PM PDT Monday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold. Provide
adequate shelter for outdoor pets or consider bringing them
indoors.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ108-110-111-114-171600-
/O.CON.KEKA.HZ.W.0010.000000T0000Z-220417T1600Z/
Southern Trinity-Northwestern Mendocino Interior-
Northeastern Mendocino Interior-Northern Lake-
621 AM PDT Sun Apr 17 2022

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS
MORNING...

* WHAT...Sub-freezing temperatures as low as 26.

* WHERE...Southern Trinity, Northeastern Mendocino Interior, 
  Northern Lake and Northwestern Mendocino Interior Counties.

* WHEN...Until 9 AM PDT this morning.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ109-112-113-115-171600-
/O.CON.KEKA.FZ.W.0014.000000T0000Z-220417T1600Z/
Mendocino Coast-Southwestern Mendocino Interior-
Southeastern Mendocino Interior-Southern Lake-
621 AM PDT Sun Apr 17 2022

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 31.

* WHERE...Mendocino Coast, Southeastern Mendocino Interior, 
  Southwestern Mendocino Interior and Southern Lake Counties.

* WHEN...Until 9 AM PDT this morning.

* IMPACTS...Frost and freeze conditions will kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Provide
adequate shelter for outdoor pets or consider bringing them
indoors.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ103-172130-
/O.CON.KEKA.FR.Y.0021.000000T0000Z-220417T1600Z/
/O.CON.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
Northern Humboldt Coast-
621 AM PDT Sun Apr 17 2022

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...
...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM TO 2 PM PDT MONDAY...

* WHAT...For the Frost Advisory, temperatures as low as 34 will 
  result in frost formation. For the Wind Advisory, southeast 
  winds 15 to 25 mph with gusts up to 50 mph expected.

* WHERE...Northern Humboldt Coast County.

* WHEN...For the Frost Advisory, until 9 AM PDT this morning. 
  For the Wind Advisory, from 8 AM to 2 PM PDT Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result. Frost could kill sensitive outdoor vegetation if left 
  uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold.

Frost Advisories and Freeze Warnings are issued during the local
growing season as defined by climatology and local agriculture
experts. Once the growing season has ended these statements will
no longer be issued until the spring.

&&

$$

CAZ101-172130-
/O.CON.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
Coastal Del Norte-
621 AM PDT Sun Apr 17 2022

...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM TO 2 PM PDT MONDAY...

* WHAT...South winds 15 to 25 mph with gusts up to 50 mph 
  expected.

* WHERE...Coastal Del Norte County.

* WHEN...From 8 AM to 2 PM PDT Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
355 
WWUS76 KEKA 171604
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
904 AM PDT Sun Apr 17 2022

CAZ106-107-180015-
/O.EXP.KEKA.HZ.W.0010.000000T0000Z-220417T1600Z/
/O.CON.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
Southern Humboldt Interior-Northern Trinity-
904 AM PDT Sun Apr 17 2022

...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM TO 2 PM MONDAY...
...HARD FREEZE WARNING HAS EXPIRED...

* WHAT...South winds 15 to 25 mph with gusts to 50 mph expected.

* WHERE...Northern Trinity and Southern Humboldt Interior.

* WHEN...From 8 AM to 2 PM Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

$$

CAZ102-104-105-180015-
/O.EXP.KEKA.FZ.W.0014.000000T0000Z-220417T1600Z/
/O.CON.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
Del Norte Interior-Southwestern Humboldt-
Northern Humboldt Interior-
904 AM PDT Sun Apr 17 2022

...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM TO 2 PM MONDAY...
...FREEZE WARNING HAS EXPIRED...

* WHAT...South winds 20 to 30 mph with gusts to 55 mph expected.

* WHERE...Del Norte Interior, Northern Humboldt Interior, and
  Southwestern Humboldt.

* WHEN...From 8 AM to 2 PM Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

$$

CAZ108-110-111-114-171715-
/O.EXP.KEKA.HZ.W.0010.000000T0000Z-220417T1600Z/
Southern Trinity-Northwestern Mendocino Interior-
Northeastern Mendocino Interior-Northern Lake-
904 AM PDT Sun Apr 17 2022

...HARD FREEZE WARNING HAS EXPIRED...

$$

CAZ109-112-113-115-171715-
/O.EXP.KEKA.FZ.W.0014.000000T0000Z-220417T1600Z/
Mendocino Coast-Southwestern Mendocino Interior-
Southeastern Mendocino Interior-Southern Lake-
904 AM PDT Sun Apr 17 2022

...FREEZE WARNING HAS EXPIRED...

$$

CAZ103-180015-
/O.EXP.KEKA.FR.Y.0021.000000T0000Z-220417T1600Z/
/O.CON.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
Northern Humboldt Coast-
904 AM PDT Sun Apr 17 2022

...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM TO 2 PM MONDAY...
...FROST ADVISORY HAS EXPIRED...

* WHAT...Southeast winds 15 to 25 mph with gusts to 50 mph expected.

* WHERE...Northern Humboldt Coast.

* WHEN...From 8 AM to 2 PM Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

$$

CAZ101-180015-
/O.CON.KEKA.WI.Y.0005.220418T1500Z-220418T2100Z/
Coastal Del Norte-
904 AM PDT Sun Apr 17 2022

...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM TO 2 PM MONDAY...

* WHAT...South winds 15 to 25 mph with gusts to 50 mph expected.

* WHERE...Coastal Del Norte.

* WHEN...From 8 AM to 2 PM Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

$$

What forecasters said that day

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

NWS Eureka, CA wrote its last area forecast discussion before this frost advisory went out at Apr 16, 3:45 AM PDT, 10 hours 24 minutes earlier.

Area forecast discussion, Apr 16, 3:45 AM PDT, 10 hours 24 minutes before
AREA FORECAST DISCUSSION
National Weather Service Eureka CA
345 AM PDT Sat Apr 16 2022

.SYNOPSIS...Widespread rain and high mountain snow will come to
an end over northwest California by this afternoon. Cold
temperatures will then occur Sunday morning, followed by
additional periods of rain Monday and Tuesday, and again Wednesday
and Thursday.

&&

.DISCUSSION...Satellite and regional radar imagery showed an
expansive area of cold cloud tops and stratiform precipitation
spreading across Northern California early Saturday morning. MRMS
precipitation estimates show the heaviest rainfall totals have
thus far occurred across the orographically favored King Range of
southwestern Humboldt County. Rain is forecast to peak in
intensity across the region shortly before 5 AM, and then begin
the process of dissipation during late morning into the afternoon
as an upper vort lobe moves across the coast and exits east.
Thereafter, neutral to slightly positive midlevel height
tendencies will spread east across NWRN CA tonight. A dry
subsident low-level air mass will develop as a result and favor
freezing temperatures across valley locations along with frost and
patchy fog. However, there is considerable uncertainty in that
scenario due to mid and high level cloudiness spreading east
across the area during the night, which could disrupt robust
radiational cooling.

After Sunday...an upper-level trough and associated surface
frontal boundary are forecast to progress east across the NERN PAC
Monday morning. South winds gusting from 20 to 40 mph during
Monday morning are probable across many exposed ridges as well as
coastal areas based on NBM v4.1 guidance. In addition, the
previously mentioned frontal boundary will aid in precipitation
development that is forecast to impact Del Norte County during
late Monday morning, Humboldt and Trinity Counties during Monday
afternoon, and then Mendocino and Lake Counties by Monday evening.
Post frontal showers will then occur Tuesday, followed by a second
storm system and additional beneficial rainfall sweeping eastward
across the West Coast Wednesday and Thursday. In addition, travel
impacts due to snow will be possible with the Wednesday/Thursday
storm system across northern Trinity County and Scott Mountain
Pass on Highway 3.

Garner

&&

.AVIATION...Another round of showers crossing the area this
morning has brought widespread MVFR ceilings alongside gusty
winds, particularly in Mendocino county. The system is expected to
quickly move east with most showers ending by sunrise for the
North Coast and before noon in for inland terminals. Model
soundings show MVFR ceilings lingering through the morning before
gradually lifting and scattering out to VFR this afternoon. Weak,
elevated marine clouds are possible, though unlikely, this
weekend; otherwise, VFR conditions are expected. /JHW

&&

.MARINE...A low pressure system is currently coming ashore just
south of Cape Mendocino. This has brought strong, erratic winds to
the area with localized gale force gusts. Northerly winds are
expected to calm and move southeast throughout the morning,
becoming mostly gentle by this evening. Small craft advisories out
for the southern waters through late this morning cover the
elevated winds. NWPS doesn't show short period seas reaching above
6 feet, but any higher seas could later justify extending the
advisories into the afternoon. Moderate to strong southerly
breezes will start to build in from north to south late Sunday
night. Models show the possibility of gale conditions during the
day Monday, but current forecasts are too uncertain to justify a
watch. Aside from wind waves, a modest westerly swell at 4 feet is
expected to arrive late Monday. /JHW

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Hard Freeze Watch from late tonight through Sunday morning
     for CAZ106-108>110-114.

     Winter Weather Advisory until 11 AM PDT this morning for
     CAZ102-107-108.

     Freeze Watch from late tonight through Sunday morning for
     CAZ102-104-105-112-113-115.

NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 9 PM PDT this evening for PZZ455.

     Small Craft Advisory until 6 PM PDT this evening for PZZ475.

&&

Visit us at https://www.weather.gov/eureka

Follow us on Facebook and Twitter at:
https://www.facebook.com/NWSEureka
https://www.twitter.com/NWSEureka

For forecast zone information
see the forecast zone map online:
https://www.weather.gov/images/eka/zonemap.png
Hazardous weather outlook, Apr 16, 5:29 AM PDT, 8 hours 40 minutes before
Hazardous Weather Outlook
National Weather Service Eureka CA
529 AM PDT Sat Apr 16 2022

CAZ102-104-105-112-113-115-171230-
Del Norte Interior-Southwestern Humboldt-Northern Humboldt Interior-
Southwestern Mendocino Interior-Southeastern Mendocino Interior-
Southern Lake-
529 AM PDT Sat Apr 16 2022

...FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY MORNING...

This hazardous weather outlook is for northwest California.

.DAY ONE...Today and tonight.

A Freeze Watch is currently in effect.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

A Freeze Watch is currently in effect.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

CAZ101-103-111-171230-
Coastal Del Norte-Northern Humboldt Coast-
Northeastern Mendocino Interior-
529 AM PDT Sat Apr 16 2022

This hazardous weather outlook is for northwest California.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

CAZ106-109-110-114-171230-
Southern Humboldt Interior-Mendocino Coast-
Northwestern Mendocino Interior-Northern Lake-
529 AM PDT Sat Apr 16 2022

...HARD FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
MORNING...

This hazardous weather outlook is for northwest California.

.DAY ONE...Today and tonight.

A Hard Freeze Watch is currently in effect.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

A Hard Freeze Watch is currently in effect.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

CAZ107-108-171230-
Northern Trinity-Southern Trinity-
529 AM PDT Sat Apr 16 2022

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 11 AM PDT THIS MORNING...
...HARD FREEZE WATCH IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
MORNING...

This hazardous weather outlook is for northwest California.

.DAY ONE...Today and tonight.

A Winter Weather Advisory is currently in effect.
A Hard Freeze Watch is currently in effect.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

A Hard Freeze Watch is currently in effect.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

The office that day

Everything else NWS Eureka, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 16, 2:17 AM PDTFreeze WatchEKADel Norte, Humboldt, Mendocino12 hr
Apr 16, 2:17 AM PDTHard Freeze WatchEKAHumboldt, Lake, Mendocino, Trinity12 hr
Apr 16, 2:09 PM PDTFreeze WarningEKADel Norte, Humboldt, Mendocino19 hr
Apr 16, 2:09 PM PDTHard Freeze WarningEKAHumboldt, Lake, Mendocino, Trinity19 hr
Apr 16, 3:05 PM PDTGale WarningEKA50 hr
Apr 16, 3:05 PM PDTSmall Craft AdvisoryEKA60 hr

Nearby

Frost Advisories in California, 2022Every frost advisory in 2022

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.