Alert archive / California / Flood Watches in 2016

Flood Watch 9, NWS Eureka, CA

November 25, 2016Del Norte County, Humboldt County, California

NWS Eureka, CA issued this flood watch at Nov 25, 2016, 8:52 AM PST for Del Norte County, Humboldt County, California. It took effect at Nov 25, 2016, 10:00 PM PST. It was in force for .

The area

The counties it named.

The facts

Issued
Nov 25, 2016, 8:52 AM PST (16:52 UTC)
In effect from
Nov 25, 2016, 10:00 PM PST
Expired
Nov 25, 2016, 2:26 PM PST
In force
Issued by
NWS Eureka, CA

Counties Del Norte County, CA, Humboldt County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 86 km from the middle of the area, began a volume at 16:53 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, 4.9 hours before the alert went out and 158 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 2016-11-25Temperature 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 12:00Z on 2016-11-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 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
1508 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

965 
WGUS66 KEKA 251652
FFAEKA

URGENT - IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE EUREKA CA
852 AM PST FRI NOV 25 2016

CAZ101-102-105-260600-
/O.CAN.KEKA.FA.A.0008.000000T0000Z-161126T1800Z/
/O.NEW.KEKA.FA.A.0009.161126T0600Z-161126T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COASTAL DEL NORTE-DEL NORTE INTERIOR-NORTHERN HUMBOLDT INTERIOR-
852 AM PST FRI NOV 25 2016

...FLOOD WATCH IN EFFECT FROM 10 PM THIS EVENING THROUGH SATURDAY
MORNING...

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

* FLOOD WATCH FOR A PORTION OF NORTHWEST CALIFORNIA...INCLUDING 
  THE FOLLOWING AREAS...COASTAL DEL NORTE...DEL NORTE INTERIOR 
  AND NORTHERN HUMBOLDT INTERIOR. 

* FROM LATE THIS EVENING THROUGH SATURDAY MORNING.

* A COLD FRONT WILL BRING PERIODS OF HEAVY RAIN TONIGHT THAT MAY
  RESULT IN MINOR URBAN AND SMALL STREAM FLOODING BY EARLY
  SATURDAY MORNING.

* THE PRIMARY IMPACTS FROM THIS EVENT WILL BE LOCALIZED PONDING OF
  WATER ON LOW LYING ROADWAYS WITH POOR DRAINAGE...RAPID RISES OF
  SMALL STREAMS...AND POTENTIALLY ROCK AND MUD SLIDES ON MOUNTAIN
  ROADS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON
CURRENT FORECASTS.

YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE
FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE
PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP.

&&

$$
1 follow-up statement
314 
WGUS66 KEKA 252226
FFAEKA

FLOOD WATCH
NATIONAL WEATHER SERVICE EUREKA CA
226 PM PST FRI NOV 25 2016

CAZ101-102-105-252330-
/O.CAN.KEKA.FA.A.0009.161126T0600Z-161126T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COASTAL DEL NORTE-DEL NORTE INTERIOR-NORTHERN HUMBOLDT INTERIOR-
226 PM PST FRI NOV 25 2016

...FLOOD WATCH IS CANCELLED...

THE FLOOD WATCH FOR A PORTION OF NORTHWEST CALIFORNIA HAS BEEN
CANCELLED. 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 25, 3:36 AM PSTGale WarningEKA23 hr
Nov 25, 3:36 AM PSTSmall Craft AdvisoryEKA4 days
Nov 25, 8:51 AM PSTWind AdvisoryEKADel Norte, Humboldt16 hr
Nov 25, 3:07 PM PSTWinter Weather AdvisoryEKADel Norte, Humboldt, Mendocino, Trinity41 hr

Nearby

Flood Watches in California, 2016Every flood watch 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.