Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 14, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Oct 25, 2021, 1:07 AM PDT for Monterey County, California. It was in force for 4 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
- Oct 25, 2021, 1:07 AM PDT (08:07 UTC)
- Expired
- Oct 25, 2021, 5:00 AM PDT
- In force
- 4 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Monterey County, CA
The radar
The San Francisco radar (KMUX), 124 km from the middle of the area, began a volume at 08:09 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
Oakland, CA (KOAK), launched 00:00Z, 8.1 hours before the alert went out and 193 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
- 1 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 472 m above ground
- 0-6 km bulk shear
- 83 kt
- 0-1 km storm-relative helicity
- 377 m²/s²
- 0-3 km storm-relative helicity
- 444 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
852
WGUS56 KMTR 250807
FFWMTR
CAC053-251200-
/O.NEW.KMTR.FF.W.0014.211025T0807Z-211025T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
107 AM PDT Mon Oct 25 2021
The National Weather Service in San Francisco has issued a
* Flash Flood Warning for...
The Dolan and Willow burn area in...
Southwestern Monterey County in central California...
* Until 500 AM PDT.
* At 107 AM PDT, Doppler radar and automated rain gauges indicated
heavy rain falling over the Dolan and Willow Burn Areas. Between
0.5 and 1 inch of rain has fallen. Additional rainfall amounts of
2 to 4 inches are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly.
Excessive rainfall over the burn area will result in debris flow
moving through the Dolan and Willow Fire burn areas. The debris flow
can consist of rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding in and around the Dolan and Willow Burn
Area.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of areas in and around
the Dolan and Willow Burn Areas.
* Some locations that will experience flash flooding include...
Lucia and Esalen Institute.
There is also a high likelihood of debris and/or rocks impacting
highway one.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall will cause
extensive and severe flash flooding of creeks...streams...and
ditches in the Dolan and Willow Burn Areas. Severe debris flows can
also be anticipated across roads. Roads and driveways may be washed
away in places. If you encounter flood waters...climb to safety.
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.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3597 12145 3594 12147 3601 12150 3605 12159
3618 12167 3618 12163 3613 12159 3621 12149
3620 12147 3620 12148 3617 12145 3618 12148
3615 12148 3615 12142 3613 12138 3600 12126
3597 12126 3596 12135
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MM2 follow-up statements
664
WGUS76 KMTR 250955
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
255 AM PDT Mon Oct 25 2021
CAC053-251200-
/O.CON.KMTR.FF.W.0014.000000T0000Z-211025T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monterey CA-
255 AM PDT Mon Oct 25 2021
...FLASH FLOOD WARNING FOR THE DOLAN AND WILLOW BURN AREA REMAINS IN
EFFECT UNTIL 5 AM PDT EARLY THIS MORNING FOR SOUTHWESTERN MONTEREY
COUNTY...
At 255 AM PDT, Doppler radar and automated rain gauges indicated
that heavy rain was falling over the Dolan and Willow Burn Areas.
Between 0.5 and 1.5 inches of rain have fallen. Additional rainfall
amounts of 2 to 4 inches are possible in the warned area. Flash
flooding is ongoing or expected to begin shortly.
Excessive rainfall over the burn area will result in debris flow
moving through the Dolan and Willow Fire burn area. The debris flow
can consist of rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding in and around the Dolan and Willow Burn
Areas.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of areas in and around
the Dolan and Willow Burn Areas.
Some locations that will experience flash flooding include...
Lucia and Esalen Institute.
There is also a high likelihood of debris and/or rocks impacting
highway one.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall will cause
extensive and severe flash flooding of creeks...streams...and
ditches in the Dolan and Willow Burn Area. Severe debris flows can
also be anticipated across roads. Roads and driveways may be washed
away in places. If you encounter flood waters...climb to safety.
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.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3597 12145 3594 12147 3601 12150 3605 12159
3618 12167 3618 12163 3613 12159 3621 12149
3620 12147 3620 12148 3617 12145 3618 12148
3615 12148 3615 12142 3613 12138 3600 12126
3597 12126 3596 12135
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MM204
WGUS76 KMTR 251156
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
456 AM PDT Mon Oct 25 2021
CAC053-251206-
/O.EXP.KMTR.FF.W.0014.000000T0000Z-211025T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monterey CA-
456 AM PDT Mon Oct 25 2021
...FLASH FLOOD WARNING FOR THE DOLAN AND WILLOW BURN AREA WILL
EXPIRE AT 5 AM PDT EARLY THIS MORNING FOR SOUTHWESTERN MONTEREY
COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3597 12145 3594 12147 3601 12150 3605 12159
3618 12167 3618 12163 3613 12159 3621 12149
3620 12147 3620 12148 3617 12145 3618 12148
3615 12148 3615 12142 3613 12138 3600 12126
3597 12126 3596 12135
$$
MMThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 24, 8:19 PM PDT | Areal Flood Advisory | MTR | Monterey, San Benito, San Mateo, Santa Clara, Santa Cruz | 9 hr |
Nearby
Flash Flood Warnings in California, 2021Every flash flood warning in 2021
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.