Alert archive / California / Flash Flood Warnings in 2018
Flash Flood Warning 1, NWS Eureka, CA
NWS Eureka, CA issued this flash flood warning at Oct 3, 2018, 1:01 PM PDT for Mendocino County, California. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Oct 3, 2018, 1:01 PM PDT (20:01 UTC)
- Expired
- Oct 3, 2018, 4:00 PM PDT
- In force
- 3 hr
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Mendocino County, CA
The radar
The Beale AFB radar (KBBX), 125 km from the middle of the area, began a volume at 20:03 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Oct 3, 1:10 PM PDT | FLASH FLOOD | 8 Ene Talmage, CA | EMERGENCY MANAGER RELAYED A REPORT OF A CREEK BEGINNING TO FLOOD A BARN NEAR THE MENDOCINO-LAKE COUNTY BORDER. THE WATER WAS BLACK FROM ASH IN THE MENDOCINO COMPLEX AND HIGHER THAN THE RESIDENT HAD EVER SEEN BEFORE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 8.0 hours before the alert went out and 185 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
- 1131 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
174
WGUS56 KEKA 032001
FFWEKA
CAC045-032300-
/O.NEW.KEKA.FF.W.0001.181003T2001Z-181003T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Eureka CA
101 PM PDT WED OCT 3 2018
The National Weather Service in Eureka California has issued a
* Flash Flood Warning for...
East central Mendocino County in northwestern California...
* Until 400 PM PDT.
* At 1259 PM PDT...Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to one inch of rain has
already fallen. Flash flooding is expected to begin shortly.
* Flash flooding will remain over mainly rural areas of east central
Mendocino County.
Excessive rainfall over the Mendocino Complex burn scar will
result in rock and mudslides and possible debris flows in areas of
steep terrain near highway 20 east of Ukiah.
This is a dangerous situation. If you observe movement of soils,
debris, or large amounts of water you should move to higher ground
immediately.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move away from recently burned areas. Life-threatening flooding of
creeks...roads and normally dry areas is likely. The heavy rains
will likely trigger rockslides...mudslides and debris flows in steep
terrain...especially in and around these areas.
&&
LAT...LON 3923 12301 3922 12302 3918 12305 3917 12307
3920 12312 3925 12315 3928 12310 3932 12308
3933 12303 3932 12303 3932 12302 3928 12302
3928 12300 3924 12299
$$
KR2 follow-up statements
688
WGUS76 KEKA 032112
FFSEKA
Flash Flood Statement
National Weather Service Eureka CA
212 PM PDT WED OCT 3 2018
CAC045-032300-
/O.CON.KEKA.FF.W.0001.000000T0000Z-181003T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mendocino CA-
212 PM PDT WED OCT 3 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM PDT FOR
EAST CENTRAL MENDOCINO COUNTY...
At 209 PM PDT, the public reported flash flooding of a creek near
the Mendocino and Lake County boarder. Up to one inch of rain has
already fallen in this area.
Excessive rainfall over the Mendocino Complex fire burn scar will
result in debris flows. Debris flows can consist of rock, mud,
vegetation and other loose materials.
Flash flooding will remain over mainly rural areas of east central
Mendocino County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry arroyos is likely. The heavy rains
will likely trigger rockslides, mudslides and debris flows in steep
terrain, especially in and around these areas.
&&
LAT...LON 3923 12301 3922 12302 3918 12305 3917 12307
3920 12312 3925 12315 3928 12310 3932 12308
3933 12303 3932 12303 3932 12302 3928 12302
3928 12300 3924 12299
$$
KR083
WGUS76 KEKA 032258
FFSEKA
Flash Flood Statement
National Weather Service Eureka CA
358 PM PDT WED OCT 3 2018
CAC045-032308-
/O.EXP.KEKA.FF.W.0001.000000T0000Z-181003T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mendocino CA-
358 PM PDT WED OCT 3 2018
...THE FLASH FLOOD WARNING FOR EAST CENTRAL MENDOCINO COUNTY WILL
EXPIRE AT 400 PM PDT...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3923 12301 3922 12302 3918 12305 3917 12307
3920 12312 3925 12315 3928 12310 3932 12308
3933 12303 3932 12303 3932 12302 3928 12302
3928 12300 3924 12299
$$
MKKThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 3, 9:54 AM PDT | Flash Flood Watch | EKA | Mendocino | 9 hr |
| Oct 3, 3:01 PM PDT | Small Craft Advisory | EKA | 36 hr |
Nearby
Flash Flood Warnings in California, 2018Every flash flood warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.