Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 50, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 9, 2017, 12:27 PM PST for Sonoma County, California. It was in force for 6 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
- Feb 9, 2017, 12:27 PM PST (20:27 UTC)
- Expired
- Feb 9, 2017, 6:30 PM PST
- In force
- 6 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), 74 km from the middle of the area, began a volume at 20:29 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, 8.5 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
- 2 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 838 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 353 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
421
WGUS56 KMTR 092027
FFWMTR
CAC097-100230-
/O.NEW.KMTR.FF.W.0050.170209T2027Z-170210T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
1227 PM PST THU FEB 9 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 630 PM PST Thursday
* At 1226 PM PST, Heavy rain has been falling across the warning
area for much of the morning, and stream gages on Sonoma Creek are
rapidly rising above flood stages. Flash flooding is already
occurring or is imminent.
* Some locations that will experience flooding include...
Sonoma, Boyes Hot Springs, Glen Ellen, Fetters Hot Springs-Agua
Caliente, Eldridge, Temelec, and El Verano.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
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 3838 12250 3833 12247 3830 12242 3823 12237
3817 12237 3816 12242 3813 12243 3812 12246
3817 12248 3819 12245 3820 12245 3826 12251
3837 12256
$$
MWS1 follow-up statement
266
WGUS76 KMTR 100229
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
629 PM PST THU FEB 9 2017
CAC097-100237-
/O.EXP.KMTR.FF.W.0050.000000T0000Z-170210T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sonoma CA-
629 PM PST THU FEB 9 2017
...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SONOMA COUNTY WILL EXPIRE
AT 630 PM PST THURSDAY...
Rainfall in the area ended hours ago and stream gages on the Sonoma
Creek indicate the creek has receded and is back in its banks, or
will be shortly. Therefore, the flash flood warning for southeastern
Sonoma County will be allowed to expire at 6:30 PM PST. Please
continue to heed all road closures.
LAT...LON 3838 12250 3833 12247 3830 12242 3823 12237
3817 12237 3816 12242 3813 12243 3812 12246
3817 12248 3819 12245 3820 12245 3826 12251
3837 12256
$$The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 9, 2:20 AM PST | Small Craft Advisory for Rough Bar | MTR | 19 hr | |
| Feb 9, 4:10 AM PST | River Flood Warning | MTR | Napa | 24 hr |
| Feb 9, 11:41 AM PST | Flash Flood Warning | MTR | Marin, Sonoma | 7 hr |
| Feb 9, 12:15 PM PST | Flash Flood Warning | MTR | Marin | 6 hr |
| Feb 9, 12:40 PM PST | Flash Flood Warning | MTR | Sonoma | 5 hr |
| Feb 9, 1:21 PM PST | Flash Flood Warning | MTR | Napa | 5 hr |
| Feb 9, 3:04 PM PST | Small Craft Advisory | MTR | 71 hr | |
| Feb 9, 3:36 PM PST | River Flood Warning | MTR | Napa | 23 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.