Alert archive / California / Frost Advisories in 2017

Frost Advisory 19, NWS Eureka, CA

October 4, 2017Trinity County, California

NWS Eureka, CA issued this frost advisory at Oct 4, 2017, 12:24 AM PDT for Trinity County, California. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Oct 4, 2017, 12:24 AM PDT (07:24 UTC)
Expired
Oct 4, 2017, 9:00 AM PDT
In force
9 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 07:29 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, 7.4 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 2017-10-04Temperature 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 2017-10-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 square meters per square second.193958Sfc1 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
3114 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
-1 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

633 
WWUS76 KEKA 040724
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
1224 AM PDT Wed Oct 4 2017

CAZ108-041600-
/O.NEW.KEKA.FR.Y.0019.171004T0724Z-171004T1600Z/
Southern Trinity-
1224 AM PDT Wed Oct 4 2017

...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. 

* TEMPERATURES...32 to 36 degrees.

* LOCATIONS INCLUDE...Hayfork...Ruth.

* 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
553 
WWUS76 KEKA 041537
NPWEKA

URGENT - WEATHER MESSAGE
National Weather Service Eureka CA
837 AM PDT Wed Oct 4 2017

CAZ108-041645-
/O.EXP.KEKA.FR.Y.0019.000000T0000Z-171004T1600Z/
Southern Trinity-
837 AM PDT Wed Oct 4 2017

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

Overnight low temperatures were in the upper 20s to mid 30s.
Temperatures will rise 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
Oct 4, 2:46 PM PDTFrost AdvisoryEKAHumboldt, Mendocino18 hr
Oct 4, 2:46 PM PDTFreeze WarningEKAMendocino, Trinity18 hr

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.