Alert archive / California / Areal Flood Advisories in 2012

Areal Flood Advisory 14, NWS Eureka, CA

December 2, 20124 counties in California

NWS Eureka, CA issued this areal flood advisory at Dec 2, 2012, 10:45 AM PST for 4 counties in California. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Dec 2, 2012, 10:45 AM PST (18:45 UTC)
Expired
Dec 2, 2012, 2:45 PM PST
In force
4 hr
Issued by
NWS Eureka, CA
Area
Storm-based polygon

Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA, Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 60 km from the middle of the area, began a volume at 18:45 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, 6.8 hours before the alert went out and 204 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 2012-12-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 joules per kilogram.LCLLFCEL10008507005003002001001 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 2012-12-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.1939587897117136156Sfc1 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
8 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
838 m above ground
0-6 km bulk shear
85 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Eureka, CA wrote its last area forecast discussion before this areal flood advisory went out at Dec 2, 10:00 AM PST, 45 minutes earlier.

Area forecast discussion, Dec 2, 10:00 AM PST, 45 minutes before
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Hazardous weather outlook, Dec 2, 5:36 AM PST, 5 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EUREKA CA
536 AM PST SUN DEC 2 2012

CAZ001>004-076-031345-
REDWOOD COAST-MENDOCINO COAST-NORTH COAST INTERIOR-
UPPER TRINITY RIVER-MENDOCINO INTERIOR-
536 AM PST SUN DEC 2 2012

...FLOOD WATCH IN EFFECT UNTIL NOON PST TODAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST CALIFORNIA.

HEAVY RAIN WILL TAPER OFF FROM NORTHWEST TO SOUTHEAST THIS MORNING
WITH SUBSIDING WINDS. FLOODING PROBLEMS WILL PERSIST ON MANY
AREA ROADS TODAY WITH CRESTING ON THE LARGER RIVERS NOT EXPECTED
UNTIL LATER TODAY OR TONIGHT. ROADWAYS ACROSS HIGHER TERRAIN HAVE
BEEN IMPACTED BY MUD AND ROCK SLIDES IN SOME AREAS. FOR
INFORMATION ABOUT ROAD CONDITIONS CALL 1 800 GAS ROAD.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

ANOTHER WET STORM SYSTEM WILL ARRIVE MONDAY NIGHT WITH A PERIOD OF
MODERATE TO HEAVY RAIN TUESDAY. 1 TO 3 INCHES OF RAINFALL IS
LIKELY BUT THE HEAVIER AMOUNTS WILL BE CONFINED TO MAINLY NORTHERN
HUMBOLDT AND DEL NORTE COUNTIES.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

FOR FURTHER DETAILS PLEASE REFER TO NOAA WEATHER RADIO OR
WEATHER.GOV/EUREKA.

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 1, 7:11 PM PSTAreal Flood WarningEKADel Norte, Humboldt12 hr
Dec 1, 8:44 PM PSTAreal Flood WarningEKAMendocino10 hr
Dec 1, 8:49 PM PSTAreal Flood WarningEKAMendocino10 hr
Dec 1, 11:42 PM PSTAreal Flood AdvisoryEKADel Norte, Humboldt, Trinity8 hr
Dec 1, 11:47 PM PSTAreal Flood AdvisoryEKAMendocino12 hr
Dec 2, 3:04 AM PSTGale WatchEKA24 hr
Dec 2, 3:04 AM PSTSmall Craft AdvisoryEKA12 hr
Dec 2, 6:52 AM PSTAreal Flood WarningEKADel Norte, Humboldt3 hr
Dec 2, 6:56 AM PSTAreal Flood WarningEKAMendocino3 hr
Dec 2, 6:58 AM PSTAreal Flood WarningEKAMendocino3 hr
Dec 2, 9:40 AM PSTRiver Flood WarningEKAHumboldt5 hr
Dec 2, 2:46 PM PSTAreal Flood AdvisoryEKADel Norte, Humboldt, Mendocino, Trinity3 hr

Nearby

Areal Flood Advisories in California, 2012Every areal flood advisory in 2012

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.