Alert archive / California / Flash Flood Warnings in 2025

Flash Flood Warning 5, NWS Eureka, CA

July 30, 2025Trinity County, California

NWS Eureka, CA issued this flash flood warning at Jul 30, 2025, 5:37 PM PDT for Trinity County, California. It was in force for 3 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 30, 2025, 5:37 PM PDT (00:37 UTC)
Expired: Jul 30, 2025, 8:30 PM PDT
In force: 3 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), 86 km from the middle of the area, began a volume at 00:38 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, 0.6 hours before the alert went out and 188 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: 509 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 2891 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

536 
WGUS56 KEKA 310037
FFWEKA
CAC105-310330-
/O.NEW.KEKA.FF.W.0005.250731T0037Z-250731T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Eureka CA
537 PM PDT Wed Jul 30 2025

The National Weather Service in Eureka has issued a

* Flash Flood Warning for...
  West Central Trinity County in northwestern California...

* Until 830 PM PDT.

* At 537 PM PDT, gauge reports indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Gauges reported.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
   Big Bar and Del Loma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4067 12342 4083 12343 4080 12315 4065 12315

FLASH FLOOD...GAUGE INDICATED

$$

JB

1 follow-up statement

319 
WGUS76 KEKA 310325
FFSEKA

Flash Flood Statement
National Weather Service Eureka CA
825 PM PDT Wed Jul 30 2025

CAC105-310335-
/O.EXP.KEKA.FF.W.0005.000000T0000Z-250731T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Trinity CA-
825 PM PDT Wed Jul 30 2025

...FLASH FLOOD WARNING WILL EXPIRE AT 830 PM PDT THIS EVENING FOR 
WEST CENTRAL TRINITY COUNTY...

Flooding is no longer expected to pose a threat. 

&&

LAT...LON 4065 12315 4067 12342 4083 12343 4080 12315

$$

JJW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 5:03 PM PDT	Special Weather Statement	EKA	Trinity	27 min
Jul 30, 5:10 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	50 min
Jul 30, 5:17 PM PDT	Areal Flood Advisory	EKA	Trinity	20 min
Jul 30, 5:18 PM PDT	Special Weather Statement	EKA		27 min
Jul 30, 5:23 PM PDT	Special Weather Statement	EKA	Trinity	37 min
Jul 30, 5:27 PM PDT	Special Weather Statement	EKA	Trinity	33 min
Jul 30, 5:47 PM PDT	Special Weather Statement	EKA	Trinity	28 min
Jul 30, 6:05 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	40 min
Jul 30, 6:23 PM PDT	Areal Flood Advisory	EKA	Trinity	3 hr
Jul 31, 4:01 PM PDT	Special Weather Statement	EKA	Trinity	29 min
Jul 31, 4:08 PM PDT	Special Weather Statement	EKA	Trinity	37 min
Jul 31, 4:25 PM PDT	Special Weather Statement	EKA	Trinity	35 min
Jul 31, 4:30 PM PDT	Special Weather Statement	EKA	Siskiyou	30 min
Jul 31, 4:41 PM PDT	Special Weather Statement	EKA	Trinity	34 min
Jul 31, 4:43 PM PDT	Special Weather Statement	EKA	Trinity	32 min

Nearby

Flash Flood Warnings in California, 2025 Every flash flood warning in 2025

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.