Alert archive / California / Frost Advisories in 2018

Frost Advisory 3, NWS Eureka, CA

March 16, 2018Mendocino County, California

NWS Eureka, CA issued this frost advisory at Mar 16, 2018, 2:12 PM PDT for Mendocino County, California. It took effect at Mar 17, 2018, 1:00 AM PDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Mar 16, 2018, 2:12 PM PDT (21:12 UTC)
In effect from
Mar 17, 2018, 1:00 AM PDT
Expired
Mar 17, 2018, 9:00 AM PDT
In force
8 hr
Issued by
NWS Eureka, CA

County Mendocino County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 139 km from the middle of the area, began a volume at 21:12 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

Oakland, CA (KOAK), launched 12:00Z, 9.2 hours before the alert went out and 218 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, Oakland, CA at 12:00Z on 2018-03-16Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 12:00Z on 2018-03-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 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
896 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

602 
WWUS76 KEKA 162112
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
212 PM PDT Fri Mar 16 2018

...A cold air mass will lead to near freezing temperatures the
next several mornings...

CAZ110-111-171015-
/O.UPG.KEKA.FZ.A.0001.180317T0800Z-180317T1600Z/
/O.NEW.KEKA.FR.Y.0003.180317T0800Z-180317T1600Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
212 PM PDT Fri Mar 16 2018

...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT SATURDAY FOR
INTERIOR VALLEYS OF MENDOCINO COUNTY...

The National Weather Service in Eureka has issued a Frost
Advisory...which is in effect from 1 AM to 9 AM PDT Saturday. The
Freeze Watch is no longer in effect. 

* LOW TEMPERATURES...33 to 36 degrees.

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

* 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.

&&

$$

CAZ113-171015-
/O.NEW.KEKA.FR.Y.0003.180317T0800Z-180317T1600Z/
Southeastern Mendocino Interior-
212 PM PDT Fri Mar 16 2018

...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM PDT FOR INTERIOR
VALLEYS OF SOUTHEAST MENDOCINO COUNTY...

The National Weather Service in Eureka has issued a Frost
Advisory...which is in effect from 1 AM to 9 AM PDT Saturday. 

* LOW TEMPERATURES...33 to 36 degrees.

* LOCATIONS INCLUDE...Ukiah Valley...Redwood Valley...Potter
  Valley.

* 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.

&&

$$
2 follow-up statements
820 
WWUS76 KEKA 170813
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
113 AM PDT Sat Mar 17 2018

...A cold air mass will lead to near freezing temperatures the
next several mornings...

CAZ109-112-171600-
/O.EXA.KEKA.FR.Y.0003.000000T0000Z-180317T1600Z/
Mendocino Coast-Southwestern Mendocino Interior-
113 AM PDT Sat Mar 17 2018

...FROST ADVISORY IN EFFECT UNTIL 9 AM PDT THIS MORNING...

The National Weather Service in Eureka has issued a Frost
Advisory...which is in effect until 9 AM PDT this morning. 

* LOW TEMPERATURES...33 to 36 degrees.

* LOCATIONS INCLUDE...Fort Bragg...Point Arena...Boonville...
  Comptche.

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

$$

CAZ110-111-113-171600-
/O.CON.KEKA.FR.Y.0003.000000T0000Z-180317T1600Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-
113 AM PDT Sat Mar 17 2018

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING...

* LOW TEMPERATURES...33 to 36 degrees.

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

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

$$
567 
WWUS76 KEKA 171542
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
842 AM PDT Sat Mar 17 2018

CAZ109>113-171645-
/O.EXP.KEKA.FR.Y.0003.000000T0000Z-180317T1600Z/
Mendocino Coast-Northwestern Mendocino Interior-
Northeastern Mendocino Interior-Southwestern Mendocino Interior-
Southeastern Mendocino Interior-
842 AM PDT Sat Mar 17 2018

...FROST ADVISORY WILL EXPIRE AT 9 AM PDT THIS MORNING...

This will be the final statement issued for this event.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 16, 3:38 AM PDTFreeze WatchEKAMendocino11 hr

Nearby

Frost Advisories in California, 2018Every frost advisory 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.