Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 9, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 27, 2021, 4:19 PM PST for Monterey County, California. It was in force for 5 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
- Jan 27, 2021, 4:19 PM PST (00:19 UTC)
- Expired
- Jan 27, 2021, 9:30 PM PST
- In force
- 5 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 00:24 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
Vandenberg AFB, CA (KVBG), launched 00:00Z, 0.3 hours before the alert went out and 175 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
- 8 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 489 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 628 m²/s²
- 0-3 km storm-relative helicity
- 730 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
874
WGUS56 KMTR 280019
FFWMTR
CAC053-280330-
/O.NEW.KMTR.FF.W.0009.210128T0019Z-210128T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
419 PM PST Wed Jan 27 2021
The National Weather Service in San Francisco has issued a
* Flash Flood Warning for...
The Dolan burn area in...
Southwestern Monterey County in central California...
* Until 730 PM PST.
* At 419 PM PST, Doppler radar and automated rain gauges indicated
heavy rain falling over the Dolan Burn Area. Up to 0.5 inches has
fallen in the last 30 minutes. Flash flooding is ongoing or
expected to begin shortly.
Excessive rainfall over the burn area will result in debris flow
moving through the Dolan 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 Burn Area.
SOURCE...Doppler radar and automated gauges.
IMPACT...Life threatening flash flooding of areas in and around
the Dolan Burn Area.
* Some locations that will experience flash flooding include...
Lucia and Esalen Institute.
This is a life threatening situation for people in or near the Dolan
Fire burn area. Some drainage basins impacted include...Stony
Creek...Nacimiento River...San Antonio River...Big Creek North Fork.
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.
This is a life-threatening situation. If you observe movement of
soils move to higher ground immediately.
&&
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
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
MM2 follow-up statements
865
WGUS56 KMTR 280315
FFWMTR
CAC053-280530-
/O.EXT.KMTR.FF.W.0009.000000T0000Z-210128T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
715 PM PST Wed Jan 27 2021
The National Weather Service in San Francisco has extended the
* Flash Flood Warning for...
The Dolan burn area in...
Southwestern Monterey County in central California...
* Until 930 PM PST.
* At 715 PM PST, Doppler radar and automated rain gauges indicated
heavy rain falling over the Dolan Burn Area. Between 0.5 and 1
inch of rain has fallen over the last hour. Flash flooding is
ongoing or expected to begin shortly.
Excessive rainfall over the burn area will result in debris flow
moving through the Dolan 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 Burn Area.
SOURCE...Doppler radar and automated gauges.
IMPACT...Life threatening flash flooding of areas in and around
the Dolan Burn Area.
* Some locations that will experience flash flooding include...
Lucia and Esalen Institute.
This is a life threatening situation for people in or near the Dolan
Fire burn area. Some drainage basins impacted include...Stony
Creek...Nacimiento River...San Antonio River...Big Creek North Fork.
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.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
This is a life-threatening situation. If you observe movement of
soils move to higher ground immediately.
&&
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
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
MM773
WGUS76 KMTR 280522
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
922 PM PST Wed Jan 27 2021
CAC053-280532-
/O.EXP.KMTR.FF.W.0009.000000T0000Z-210128T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monterey CA-
922 PM PST Wed Jan 27 2021
...FLASH FLOOD WARNING FOR THE DOLAN BURN AREA WILL EXPIRE AT 930 PM
PST THIS EVENING FOR SOUTHWESTERN MONTEREY COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Additional rain is still possible through Thursday. Please
continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 400 PM PST Thursday for
a portion of western California.
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 |
|---|---|---|---|---|
| Jan 27, 4:02 PM PST | Areal Flood Advisory | MTR | Monterey, San Benito | 3 hr |
| Jan 27, 5:28 PM PST | Small Craft Advisory | MTR | 22 hr | |
| Jan 27, 7:02 PM PST | Flash Flood Warning | MTR | Monterey | 3 hr |
| Jan 27, 7:05 PM PST | Flash Flood Warning | MTR | Monterey | 3 hr |
| Jan 27, 7:32 PM PST | Areal Flood Advisory | MTR | Monterey, San Benito, Santa Clara, Santa Cruz | 3 hr |
| Jan 27, 10:39 PM PST | Areal Flood Advisory | MTR | Monterey, San Benito, Santa Clara, Santa Cruz | 4 hr |
| Jan 28, 4:33 AM PST | Areal Flood Advisory | MTR | Monterey, San Benito, Santa Clara, Santa Cruz | 11 hr |
| Jan 28, 4:59 AM PST | Areal Flood Warning | MTR | Monterey | 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.