Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 27, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 20, 2017, 4:49 AM PST for Sonoma 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
- Jan 20, 2017, 4:49 AM PST (12:49 UTC)
- Expired
- Jan 20, 2017, 8:45 AM PST
- In force
- 4 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Sonoma County, CA
The radar
The Sacramento radar (KDAX), 79 km from the middle of the area, began a volume at 12:51 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 12:00Z, 0.8 hours before the alert went out and 61 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
- 774 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 501 m²/s²
- 0-3 km storm-relative helicity
- 746 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
807
WGUS56 KMTR 201249
FFWMTR
CAC097-201645-
/O.NEW.KMTR.FF.W.0027.170120T1249Z-170120T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
449 AM PST FRI JAN 20 2017
The National Weather Service in The San Francisco Bay Area has issued
a
* Flash Flood Warning for...
Southeastern Sonoma County in northern California...
* Until 845 AM PST
* At 447 AM PST, Doppler radar and automated rain gauges indicated
heavy rain falling across the warned area. Flash flooding is
already occurring in the Petaluma area, specifically in Willow
Brook at Penngrove Park.
* Steep rises in water level are also being reported on Sonoma Creek
at Agua Caliente, and are quickly approaching flood stage.
* Some locations that will experience flooding include...
Petaluma, Sonoma, Boyes Hot Springs, Fetters Hot Spring, Fetters
Hot Springs-Agua Caliente, Temelec, El Verano and Eldridge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 3824 12237 3816 12237 3816 12241 3815 12238
3811 12249 3815 12253 3816 12256 3818 12257
3818 12260 3822 12266 3829 12269 3832 12263
3827 12253 3833 12251 3834 12246
$$
MWS1 follow-up statement
591
WGUS76 KMTR 201640
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
840 AM PST FRI JAN 20 2017
CAC097-201646-
/O.EXP.KMTR.FF.W.0027.000000T0000Z-170120T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sonoma CA-
840 AM PST FRI JAN 20 2017
...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SONOMA COUNTY WILL EXPIRE
AT 845 AM PST...
Flood waters have receded in most of the Petaluma area creeks. Water
levels are still above flood levels at the Willow Brook and Petaluma
River at Corona Road gaging sites, but are beginning to fall
rapidly. Sonoma Creek at Agua Caliente has receded back down below
flood stage. Sporadic showers remain possible today, but excessive
runoff is not expected to exacerbate conditions. Please continue to
heed any remaining road closures.
LAT...LON 3824 12237 3816 12237 3816 12241 3815 12238
3811 12249 3815 12253 3816 12256 3818 12257
3818 12260 3822 12266 3829 12269 3832 12263
3827 12253 3833 12251 3834 12246
$$
MWSThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 19, 9:01 PM PST | Gale Warning | MTR | 10 hr | |
| Jan 19, 9:01 PM PST | Small Craft Advisory | MTR | 42 hr | |
| Jan 20, 1:26 AM PST | Areal Flood Advisory | MTR | Marin, Sonoma | 3 hr |
| Jan 20, 3:02 AM PST | Special Marine Warning | MTR | 43 min | |
| Jan 20, 3:39 AM PST | Special Weather Statement | MTR | San Mateo | 36 min |
| Jan 20, 4:07 AM PST | Special Marine Warning | MTR | 23 min | |
| Jan 20, 4:14 AM PST | Special Weather Statement | MTR | Alameda, Contra Costa, San Mateo | 31 min |
| Jan 20, 5:27 AM PST | Areal Flood Advisory | MTR | San Mateo, Santa Clara, Santa Cruz | 3 hr |
| Jan 20, 6:38 AM PST | Flash Flood Warning | MTR | Santa Cruz | 6 hr |
| Jan 20, 7:08 AM PST | Flash Flood Warning | MTR | Santa Clara | 6 hr |
| Jan 20, 7:31 AM PST | Areal Flood Warning | MTR | Santa Cruz | 12 hr |
| Jan 20, 7:55 AM PST | Areal Flood Warning | MTR | Sonoma | 18 hr |
| Jan 20, 12:20 PM PST | Flash Flood Warning | MTR | San Benito | 4 hr |
| Jan 20, 12:51 PM PST | High Wind Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 15 hr |
| Jan 20, 1:27 PM PST | Flash Flood Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 3 days |
| Jan 20, 2:33 PM PST | Gale Watch | MTR | 14 hr | |
| Jan 20, 2:33 PM PST | Gale Warning | MTR | 42 hr | |
| Jan 20, 3:51 PM PST | Areal Flood Advisory | MTR | San Benito, Santa Clara | 70 hr |
| Jan 20, 3:56 PM PST | Areal Flood Warning | MTR | San Benito, Santa Clara | 72 hr |
Nearby
Flash Flood Warnings in California, 2017Every flash flood warning in 2017
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.