Alert archive / California / Frost Advisories in 2016

Frost Advisory 14, NWS Eureka, CA

November 1, 2016Trinity County, California

NWS Eureka, CA issued this frost advisory at Nov 1, 2016, 9:57 PM PDT for Trinity County, California. It took effect at Nov 2, 2016, 1:00 AM PDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Nov 1, 2016, 9:57 PM PDT (04:57 UTC)
In effect from
Nov 2, 2016, 1:00 AM PDT
Expired
Nov 2, 2016, 8:00 AM PDT
In force
7 hr
Issued by
NWS Eureka, CA

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 101 km from the middle of the area, began a volume at 04:54 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 00:00Z, 5.0 hours before the alert went out and 193 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 00:00Z on 2016-11-02Temperature 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 00:00Z on 2016-11-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 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
1487 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

954 
WWUS76 KEKA 020457
NPWEKA

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
957 PM PDT TUE NOV 1 2016

...LOCALIZED FROST IS EXPECTED IN SEVERAL VALLEYS ACROSS TRINITY
COUNTY TONIGHT DUE TO TEMPERATURES IN THE MID 30S AND LIGHT WINDS...

CAZ107-108-021500-
/O.NEW.KEKA.FR.Y.0014.161102T0800Z-161102T1500Z/
NORTHERN TRINITY-SOUTHERN TRINITY-
957 PM PDT TUE NOV 1 2016

...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM PDT WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A FROST
ADVISORY...WHICH IS IN EFFECT FROM 1 AM TO 8 AM PDT WEDNESDAY. 

* LOW TEMPERATURES...MID TO UPPER 30S.

* LOCATIONS INCLUDE...HAYFORK...TRINITY CENTER...PEANUT...WITH
  LOWER PROBABILITIES IN WEAVERVILLE...JUNCTION CITY...LEWISTON.

* 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
604 
WWUS76 KEKA 021443
NPWEKA

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
743 AM PDT WED NOV 2 2016

CAZ107-108-021545-
/O.EXP.KEKA.FR.Y.0014.000000T0000Z-161102T1500Z/
NORTHERN TRINITY-SOUTHERN TRINITY-
743 AM PDT WED NOV 2 2016

...FROST ADVISORY WILL EXPIRE AT 8 AM PDT THIS MORNING...

OVERNIGHT TEMPERATURES DROPPED INTO THE LOW TO MID 30S. TRINITY
CENTER REPORTED A LOW OF 32. HAYFORK REPORTED A LOW OF 37...WHILE
RUTH OBSERVED A LOW OF 36. TEMPERATURES SHOULD BE RISING THIS
MORNING WITH DAYTIME HEATING.

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
Nov 2, 10:45 AM PDTBeach Hazards StatementEKADel Norte, Humboldt, Mendocino24 hr

Nearby

Frost Advisories in California, 2016Every frost advisory in 2016

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.