Alert archive / California / Frost Advisories in 2017

Frost Advisory 8, NWS Eureka, CA

April 13, 2017Del Norte County, Humboldt County, Mendocino County, California

NWS Eureka, CA issued this frost advisory at Apr 13, 2017, 3:21 PM PDT for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Apr 14, 2017, 2:00 AM PDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Apr 13, 2017, 3:21 PM PDT (22:21 UTC)
In effect from
Apr 14, 2017, 2:00 AM PDT
Expired
Apr 14, 2017, 7:00 AM PDT
In force
5 hr
Issued by
NWS Eureka, CA

Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 47 km from the middle of the area, began a volume at 22:23 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, 10.4 hours before the alert went out and 210 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 2017-04-13Temperature 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, Medford/Jackson, OR at 12:00Z on 2017-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
658 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

620 
WWUS76 KEKA 132221
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
321 PM PDT Thu Apr 13 2017

CAZ110-111-113-141130-
/O.NEW.KEKA.FR.Y.0008.170414T0900Z-170414T1400Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-
321 PM PDT Thu Apr 13 2017

...FROST ADVISORY IN EFFECT FROM 2 AM TO 7 AM PDT FRIDAY...

The National Weather Service in Eureka has issued a Frost
Advisory...which is in effect from 2 AM to 7 AM PDT Friday. 

* LOCATIONS INCLUDE...Willits...Leggett...Laytonville. 

* FOR A DETAILED VIEW OF THE HAZARD AREA...visit 
  http://www.wrh.noaa.gov/map

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Frost Advisory means that frost is possible. Sensitive outdoor
plants may be killed if left uncovered.

&&

$$
4 follow-up statements
724 
WWUS76 KEKA 132225 CCA
NPWEKA

URGENT - WEATHER MESSAGE...CORRECTED
National Weather Service Eureka CA
325 PM PDT Thu Apr 13 2017

CAZ110-111-113-141030-
/O.COR.KEKA.FR.Y.0008.170414T0900Z-170414T1400Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-
325 PM PDT Thu Apr 13 2017

...FROST ADVISORY IN EFFECT FROM 2 AM TO 7 AM PDT FRIDAY...

The National Weather Service in Eureka has issued a Frost
Advisory...which is in effect from 2 AM to 7 AM PDT Friday. 

* LOCATIONS INCLUDE...Willits...Leggett...Laytonville. 

* LOW TEMPERATURES...33 to 37.

* FOR A DETAILED VIEW OF THE HAZARD AREA...visit 
  http://www.wrh.noaa.gov/map

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Frost Advisory means that frost is possible. Sensitive outdoor
plants may be killed if left uncovered.

&&

$$
780 
WWUS76 KEKA 140139
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
639 PM PDT Thu Apr 13 2017

CAZ102-105-106-141400-
/O.EXA.KEKA.FR.Y.0008.170414T0900Z-170414T1400Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
639 PM PDT Thu Apr 13 2017

...FROST ADVISORY IN EFFECT FROM 2 AM TO 7 AM PDT FRIDAY...

The National Weather Service in Eureka has issued a Frost
Advisory...which is in effect from 2 AM to 7 AM PDT Friday. 

* LOCATIONS INCLUDE...Gasquet...Willow ...Creek...Orleans...
  Garberville...Bridgeville.

* LOW TEMPERATURES...33 to 36.

* FOR A DETAILED VIEW OF THE HAZARD AREA...visit 
  http://www.wrh.noaa.gov/map

$$

CAZ110-111-113-141400-
/O.CON.KEKA.FR.Y.0008.170414T0900Z-170414T1400Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-
639 PM PDT Thu Apr 13 2017

...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 7 AM PDT
FRIDAY...

* LOCATIONS INCLUDE...Covelo...Ukiah...Hopland...Leggett...
  Laytonville...Willits.

* LOW TEMPERATURES...33 to 36.

* FOR A DETAILED VIEW OF THE HAZARD AREA...visit 
  http://www.wrh.noaa.gov/map

$$
581 
WWUS76 KEKA 141037
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
337 AM PDT Fri Apr 14 2017


CAZ102-105-106-141145-
/O.CAN.KEKA.FR.Y.0008.000000T0000Z-170414T1400Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
337 AM PDT Fri Apr 14 2017

...FROST ADVISORY IS CANCELLED...

The National Weather Service in Eureka has cancelled the Frost
Advisory. 

Patchy frost may be possible in isolated areas with little cloud
coverage early this morning. 

$$

CAZ110-111-113-141400-
/O.CON.KEKA.FR.Y.0008.000000T0000Z-170414T1400Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-
337 AM PDT Fri Apr 14 2017

...FROST ADVISORY REMAINS IN EFFECT UNTIL 7 AM PDT THIS MORNING...

* LOCATIONS INCLUDE...Covelo...Ukiah...Hopland...Leggett...
  Laytonville...Willits.

* LOW TEMPERATURES...33 to 36.

* FOR A DETAILED VIEW OF THE HAZARD AREA...visit 
  http://www.wrh.noaa.gov/map

$$
759 
WWUS76 KEKA 141400
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
700 AM PDT Fri Apr 14 2017


CAZ110-111-113-141500-
/O.EXP.KEKA.FR.Y.0008.000000T0000Z-170414T1400Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-
700 AM PDT Fri Apr 14 2017

...FROST ADVISORY HAS EXPIRED...


$$

Nearby

Frost Advisories in California, 2017Every frost advisory in 2017

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.