Alert archive / California / Frost Advisories in 2018

Frost Advisory 7, NWS Eureka, CA

March 27, 2018Mendocino County, California

NWS Eureka, CA issued this frost advisory at Mar 27, 2018, 2:26 AM PDT for Mendocino County, California. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Mar 27, 2018, 2:26 AM PDT (09:26 UTC)
Expired
Mar 27, 2018, 9:00 AM PDT
In force
7 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 09:31 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 00:00Z, 9.4 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 00:00Z on 2018-03-27Temperature 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, Oakland, CA at 00:00Z on 2018-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 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
2009 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

882 
WWUS76 KEKA 270926
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
226 AM PDT Tue Mar 27 2018

CAZ110>112-271600-
/O.NEW.KEKA.FR.Y.0007.180327T0926Z-180327T1600Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southwestern Mendocino Interior-
226 AM PDT Tue Mar 27 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...mid 30s.

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

* 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.

&&

$$
1 follow-up statement
099 
WWUS76 KEKA 271603
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
903 AM PDT Tue Mar 27 2018

CAZ110>112-271715-
/O.EXP.KEKA.FR.Y.0007.000000T0000Z-180327T1600Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southwestern Mendocino Interior-
903 AM PDT Tue Mar 27 2018

...FROST ADVISORY HAS EXPIRED...

Low temperatures are expected to be a few degrees warmer tonight.

$$

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.