Alert archive / California / Frost Advisories in 2016

Frost Advisory 13, NWS Eureka, CA

October 23, 2016Trinity County, California

NWS Eureka, CA issued this frost advisory at Oct 23, 2016, 5:12 AM PDT for Trinity County, California. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Oct 23, 2016, 5:12 AM PDT (12:12 UTC)
Expired
Oct 23, 2016, 8:00 AM PDT
In force
3 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 12:16 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, 0.2 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 12:00Z on 2016-10-23Temperature 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 2016-10-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 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
977 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
215 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

651 
WWUS76 KEKA 231212
NPWEKA

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
512 AM PDT SUN OCT 23 2016

CAZ107-108-231500-
/O.NEW.KEKA.FR.Y.0013.161023T1212Z-161023T1500Z/
NORTHERN TRINITY-SOUTHERN TRINITY-
512 AM PDT SUN OCT 23 2016

...FROST ADVISORY IN EFFECT UNTIL 8 AM PDT THIS MORNING...

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A FROST
ADVISORY...WHICH IS IN EFFECT UNTIL 8 AM PDT THIS MORNING. 

* LOW TEMPERATURES...MID 30S. A FEW OF THE COLDEST SPOTS MAY SEE
  TEMPERATURES BRIEFLY HIT 32 DEGREES.

* LOCATIONS INCLUDE...HAYFORK...RUTH...TRINITY CENTER AND
  WEAVERVILLE.

* 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
401 
WWUS76 KEKA 231452
NPWEKA

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
752 AM PDT SUN OCT 23 2016

CAZ107-108-231600-
/O.EXP.KEKA.FR.Y.0013.000000T0000Z-161023T1500Z/
NORTHERN TRINITY-SOUTHERN TRINITY-
752 AM PDT SUN OCT 23 2016

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

TEMPERATURES DROPPED TO THE LOW TO MID 30S ACROSS INTERIOR VALLEYS
THIS MORNING. HAYFORK SAW A LOW OF 32...AND SCOTT VALLEY OBSERVED
A LOW OF 31. RUTH HAD A LOW OF 33. TEMPERATURES ARE EXPECTED TO
REBOUND 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
Oct 22, 9:02 PM PDTGale WatchEKA17 hr
Oct 23, 3:29 AM PDTGale WarningEKA36 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.