Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 31, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 22, 2017, 5:11 AM PST for Napa County, 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 22, 2017, 5:11 AM PST (13:11 UTC)
- Expired
- Jan 22, 2017, 9:15 AM PST
- In force
- 4 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Napa County, CA, Sonoma County, CA
The radar
The Sacramento radar (KDAX), 73 km from the middle of the area, began a volume at 13:15 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, 1.2 hours before the alert went out and 57 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
- 760 m above ground
- 0-6 km bulk shear
- 101 kt
- 0-1 km storm-relative helicity
- 706 m²/s²
- 0-3 km storm-relative helicity
- 1006 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
287
WGUS56 KMTR 221311
FFWMTR
CAC055-097-221715-
/O.NEW.KMTR.FF.W.0031.170122T1311Z-170122T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
511 AM PST SUN JAN 22 2017
The National Weather Service in The San Francisco Bay Area has issued
a
* Flash Flood Warning for...
Southern Napa County in northern California...
Southeastern Sonoma County in northern California...
* Until 915 AM PST
* At 509 AM PST, gauge reports indicated heavy rain falling across
the warned area, as well as stage rapidly rising above flood
levels on Sonoma Creek at Agua Caliente. Flash flooding is already
occurring.
* Some locations that will experience flooding include...
the lower Sonoma Valley area.
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 3816 12239 3815 12240 3816 12240 3814 12242
3833 12253 3836 12249
$$
MWSThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 22, 12:45 AM PST | Areal Flood Warning | MTR | Monterey | 6 hr |
| Jan 22, 1:47 AM PST | Areal Flood Warning | MTR | Sonoma | 6 hr |
| Jan 22, 2:47 AM PST | High Surf Advisory | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 48 hr |
| Jan 22, 4:30 AM PST | Areal Flood Advisory | MTR | San Mateo | 60 min |
| Jan 22, 5:47 AM PST | Areal Flood Advisory | MTR | Alameda, Santa Clara, Santa Cruz | 118 min |
| Jan 22, 6:28 AM PST | Flash Flood Warning | MTR | Santa Cruz | 4 hr |
| Jan 22, 7:32 AM PST | Areal Flood Warning | MTR | Sonoma | 24 hr |
| Jan 22, 8:08 AM PST | Flash Flood Warning | MTR | Monterey | 3 hr |
| Jan 22, 8:12 AM PST | Flash Flood Warning | MTR | Santa Clara | 3 hr |
| Jan 22, 8:35 AM PST | Flash Flood Warning | MTR | Santa Cruz | 3 hr |
| Jan 22, 11:34 AM PST | Areal Flood Warning | MTR | Santa Cruz | 24 hr |
| Jan 22, 12:27 PM PST | Areal Flood Advisory | MTR | San Mateo, Santa Clara, Santa Cruz | 6 hr |
| Jan 22, 12:35 PM PST | Flash Flood Warning | MTR | San Benito, Santa Clara | 6 hr |
| Jan 22, 1:17 PM PST | Special Marine Warning | MTR | 28 min | |
| Jan 22, 2:29 PM PST | Special Weather Statement | MTR | San Mateo | 16 min |
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.