Alert archive / California / Flash Flood Warnings in 2009

Flash Flood Warning 1, NWS Eureka, CA

June 3, 2009Humboldt County, Trinity County, California

NWS Eureka, CA issued this flash flood warning at Jun 3, 2009, 5:05 PM PDT for Humboldt County, Trinity County, California. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 3, 2009, 5:05 PM PDT (00:05 UTC)
Expired: Jun 3, 2009, 5:30 PM PDT
In force: 25 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon
Flood severity: None

Counties Humboldt County, CA, Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 94 km from the middle of the area, began a volume at 00:07 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, 0.1 hours before the alert went out and 150 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 12 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 2186 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS56 KEKA 040005
FFWEKA
CAC023-105-040030-
/O.NEW.KEKA.FF.W.0001.090604T0005Z-090604T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE
505 PM PDT WED JUN 3 2009

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA...
  THIS INCLUDES THE CITIES OF...WILLOW CREEK...HOOPA...
  TRINITY COUNTY IN NORTHWEST CALIFORNIA...

* UNTIL 530 PM PDT

* AT 504 PM PDT...THE PUBLIC REPORTED FLASH FLOODING FROM A
  THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WEITCHPEC

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4126 12394 4128 12344 4127 12343 4122 12343
      4119 12340 4117 12339 4085 12353 4088 12377

$$

TH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 5:00 PM PDT	Severe Thunderstorm Warning	EKA	Humboldt, Trinity	15 min
Jun 3, 5:17 PM PDT	Severe Thunderstorm Warning	EKA	Humboldt	13 min
Jun 3, 5:24 PM PDT	Special Weather Statement	EKA	Mendocino	21 min
Jun 3, 5:42 PM PDT	Special Weather Statement	EKA	Mendocino	33 min

Nearby

Flash Flood Warnings in California, 2009 Every flash flood warning in 2009

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.