Alert archive / California / Flash Flood Warnings in 2015

Flash Flood Warning 1, NWS Eureka, CA

July 4, 2015Trinity County, California

NWS Eureka, CA issued this flash flood warning at Jul 4, 2015, 5:13 PM PDT for Trinity County, California. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 4, 2015, 5:13 PM PDT (00:13 UTC)
Expired
Jul 4, 2015, 7:15 PM PDT
In force
2 hr
Issued by
NWS Eureka, CA
Area
Storm-based polygon
Flood severity
None

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 102 km from the middle of the area, began a volume at 00:13 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, 0.2 hours before the alert went out and 221 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 2015-07-05Temperature 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 00:00Z on 2015-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.19395878Sfc1 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
3806 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
31 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.

743 
WGUS56 KEKA 050013
FFWEKA
CAC105-050215-
/O.NEW.KEKA.FF.W.0001.150705T0013Z-150705T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE EUREKA
513 PM PDT SAT JUL 4 2015

THE NATIONAL WEATHER SERVICE IN EUREKA CALIFORNIA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL TRINITY COUNTY IN NORTHWESTERN CALIFORNIA...

* UNTIL 715 PM PDT
    
* AT 508 PM PDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA EAST OF PEANUT AND ALONG HIGHWAY 
  36. ONE TO TWO INCHES OF RAIN HAS ALREADY FALLEN. FLASH FLOODING 
  IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT MAY EXPERIENCE FLOODING INCLUDE...PEANUT AND 
  HAYFORK AND ALSO HIGHWAYS 36 AND 3 NEAR PEANUT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD 
DEATHS OCCUR IN VEHICLES.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4035 12306 4034 12307 4033 12316 4050 12318
      4053 12307 4035 12304

$$

RPA
2 follow-up statements
688 
WGUS76 KEKA 050103
FFSEKA

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE EUREKA
603 PM PDT SAT JUL 4 2015

CAC105-050215-
/O.CON.KEKA.FF.W.0001.000000T0000Z-150705T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TRINITY CA-
603 PM PDT SAT JUL 4 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM PDT FOR
CENTRAL TRINITY COUNTY...

AT 559 PM PDT...DOPPLER RADAR INDICATES THAT THUNDERSTORMS PRODUCED 
HEAVY RAIN EAST OF PEANUT ALONG HIGHWAY 36. TWO TO THREE INCHES OF 
RAIN HAS ALREADY FALLEN AND RUNOFF WILL LIKELY RESULT IN FLASH 
FLOODING.

SOME LOCATIONS THAT MAY EXPERIENCE FLASH FLOODING INCLUDE...PEANUT 
AND HAYFORK AND ALSO HIGHWAYS 36 AND 3 NEAR PEANUT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4035 12306 4034 12307 4033 12316 4050 12318
      4053 12307 4035 12304

$$

RPA
967 
WGUS76 KEKA 050217
FFSEKA

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE EUREKA
717 PM PDT SAT JUL 4 2015

CAC105-050225-
/O.EXP.KEKA.FF.W.0001.000000T0000Z-150705T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TRINITY CA-
717 PM PDT SAT JUL 4 2015

...THE FLASH FLOOD WARNING FOR CENTRAL TRINITY COUNTY HAS EXPIRED...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO 
POSE A SIGNIFICANT THREAT. MOTORISTS SHOULD REMAIN VIGILANT FOR 
POSSIBLE WASHED OUT ROADWAYS AND ROCKS ON THE ROAD AROUND AND 
EAST OF PEANUT.

LAT...LON 4035 12306 4034 12307 4033 12316 4050 12318
      4053 12307 4035 12304

$$

RPA

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 5:28 PM PDTSpecial Weather StatementEKATrinity32 min
Jul 4, 5:36 PM PDTSevere Thunderstorm WarningEKATrinity28 min
Jul 4, 6:28 PM PDTSpecial Weather StatementEKATrinity32 min
Jul 5, 4:45 PM PDTSpecial Weather StatementEKATrinity30 min

Nearby

Flash Flood Warnings in California, 2015Every flash flood warning in 2015

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.