Alert archive / California / Flash Flood Warnings in 2023
Flash Flood Warning 1, NWS Eureka, CA
NWS Eureka, CA issued this flash flood warning at Aug 19, 2023, 1:15 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
- Aug 19, 2023, 1:15 PM PDT (20:15 UTC)
- Expired
- Aug 19, 2023, 3:45 PM PDT
- In force
- 3 hr
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 103 km from the middle of the area, began a volume at 20:20 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, 8.3 hours before the alert went out and 225 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1937 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
468
WGUS56 KEKA 192015
FFWEKA
CAC105-192145-
/O.NEW.KEKA.FF.W.0001.230819T2015Z-230819T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Eureka CA
115 PM PDT Sat Aug 19 2023
The National Weather Service in Eureka has issued a
* Flash Flood Warning for...
Southern Trinity County in northwestern California...
* Until 245 PM PDT.
* At 115 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 1.5 inches of
rain have fallen. The expected rainfall rate is 0.5 to 1 inch in 1
hour. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
mainly rural areas of Southern Trinity County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4030 12307 4032 12314 4034 12313 4036 12316
4038 12315 4039 12315 4039 12314 4038 12313
4040 12311 4040 12308 4039 12306 4037 12303
4036 12304 4035 12304 4035 12306 4033 12307
4031 12306 4031 12307
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...0.5-1 INCH IN 1 HOUR
$$
SEC2 follow-up statements
264
WGUS56 KEKA 192142
FFWEKA
CAC105-192245-
/O.EXT.KEKA.FF.W.0001.000000T0000Z-230819T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Eureka CA
242 PM PDT Sat Aug 19 2023
The National Weather Service in Eureka has extended the
* Flash Flood Warning for...
Southern Trinity County in northwestern California...
* Until 345 PM PDT.
* At 242 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 to 2.5 inches of
rainfall have fallen. Additional rainfall amounts of 0.5 to 1 inch
are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
mainly rural areas of Southern Trinity County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4030 12307 4032 12314 4034 12313 4036 12316
4038 12315 4039 12315 4039 12314 4038 12313
4040 12311 4040 12308 4039 12306 4037 12303
4036 12304 4035 12304 4035 12306 4033 12307
4031 12306 4031 12307
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 2 HOURS
$$
SEC980
WGUS76 KEKA 192245
FFSEKA
Flash Flood Statement
National Weather Service Eureka CA
345 PM PDT Sat Aug 19 2023
CAC105-192255-
/O.EXP.KEKA.FF.W.0001.000000T0000Z-230819T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Trinity CA-
345 PM PDT Sat Aug 19 2023
...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHERN TRINITY COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 4030 12307 4032 12314 4034 12313 4036 12316
4038 12315 4039 12315 4039 12314 4038 12313
4040 12311 4040 12308 4039 12306 4037 12303
4036 12304 4035 12304 4035 12306 4033 12307
4031 12306 4031 12307
$$
MKKThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 5:26 PM PDT | Special Weather Statement | EKA | Trinity | 34 min |
| Aug 18, 5:32 PM PDT | Special Weather Statement | EKA | Trinity | 28 min |
| Aug 18, 6:26 PM PDT | Special Weather Statement | EKA | Trinity | 34 min |
| Aug 19, 3:35 AM PDT | Red Flag Warning | EKA | 16 hr | |
| Aug 19, 9:02 AM PDT | Small Craft Advisory | EKA | 39 hr | |
| Aug 19, 12:36 PM PDT | Special Weather Statement | EKA | Trinity | 39 min |
| Aug 19, 2:30 PM PDT | Special Weather Statement | EKA | 45 min | |
| Aug 19, 2:32 PM PDT | Special Weather Statement | EKA | Mendocino | 43 min |
| Aug 19, 2:41 PM PDT | Special Weather Statement | EKA | Trinity | 34 min |
| Aug 19, 2:45 PM PDT | Special Weather Statement | EKA | Humboldt | 45 min |
| Aug 19, 2:54 PM PDT | Special Weather Statement | EKA | Humboldt | 36 min |
| Aug 19, 3:10 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Mendocino, Trinity | 20 min |
| Aug 19, 3:17 PM PDT | Special Weather Statement | EKA | Trinity | 43 min |
| Aug 19, 3:50 PM PDT | Flash Flood Warning | EKA | Trinity | 85 min |
Nearby
Flash Flood Warnings in California, 2023Every flash flood warning in 2023
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.