Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 11, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 27, 2021, 7:05 PM PST for Monterey 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
- Jan 27, 2021, 7:05 PM PST (03:05 UTC)
- Expired
- Jan 27, 2021, 10:15 PM PST
- In force
- 3 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), 82 km from the middle of the area, began a volume at 03:10 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, 3.1 hours before the alert went out and 151 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
- 685 m above ground
- 0-6 km bulk shear
- 76 kt
- 0-1 km storm-relative helicity
- 236 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
254
WGUS56 KMTR 280305
FFWMTR
CAC053-280615-
/O.NEW.KMTR.FF.W.0011.210128T0305Z-210128T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
705 PM PST Wed Jan 27 2021
The National Weather Service in San Francisco has issued a
* Flash Flood Warning for...
The River Fire burn area in...
Northwestern Monterey County in central California...
* Until 1015 PM PST.
* At 705 PM PST, Doppler radar and automated rain gauges indicated
heavy rain falling over the River Fire Burn Area. Between 0.5 and
0.75 inch of rain has fallen. Flash flooding is expected to begin
shortly.
Excessive rainfall over the burn area will result in debris flow
moving through the River 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 River Fire Burn Area.
SOURCE...Doppler radar and automated gauges.
IMPACT...Life threatening flash flooding of areas in and around
the River Fire Burn Area.
* Some locations that will experience flash flooding include...
mainly rural areas of Northwestern Monterey County
This is a life threatening situation for people in or near the River
Fire burn area. Some drainage basins impacted include...Tularcitos
Creek and Agua Mala Creek
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 3645 12163 3645 12161 3647 12161 3649 12164
3652 12160 3657 12169 3660 12169 3660 12165
3657 12161 3658 12159 3639 12144 3638 12145
3643 12151 3642 12150 3640 12153 3639 12152
3637 12152 3637 12153 3643 12158 3642 12160
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
AS1 follow-up statement
519
WGUS76 KMTR 280607
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
1007 PM PST Wed Jan 27 2021
CAC053-280617-
/O.EXP.KMTR.FF.W.0011.000000T0000Z-210128T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monterey CA-
1007 PM PST Wed Jan 27 2021
...FLASH FLOOD WARNING FOR THE RIVER FIRE BURN AREA WILL EXPIRE AT
1015 PM PST THIS EVENING FOR NORTHWESTERN MONTEREY COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Additional rain showers are possible through Thursday.
Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 500 PM PST Thursday for
a portion of western California.
LAT...LON 3645 12163 3645 12161 3647 12161 3649 12164
3652 12160 3657 12169 3660 12169 3660 12165
3657 12161 3658 12159 3639 12144 3638 12145
3643 12151 3642 12150 3640 12153 3639 12152
3637 12152 3637 12153 3643 12158 3642 12160
$$
ASThe 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, 4:19 PM PST | Flash Flood Warning | MTR | Monterey | 5 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, 7:32 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.