Alert archive / California / Flash Flood Warnings in 2016
Flash Flood Warning 19, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Dec 15, 2016, 5:08 PM PST for Marin County, Sonoma County, California. It was in force for 3 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Dec 15, 2016, 5:08 PM PST (01:08 UTC)
- Expired
- Dec 15, 2016, 8:00 PM PST
- In force
- 3 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Marin County, CA, Sonoma County, CA
The radar
The Sacramento radar (KDAX), 91 km from the middle of the area, began a volume at 01:11 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 15, 6:59 PM PST | FLASH FLOOD | 1 S Sonoma, CA | 500 FEET OF ROADWAY FLOODING - AT LEAST 6 VEHICLES STALLED IN THE FLOODED ROAD |
| Dec 15, 7:49 PM PST | FLASH FLOOD | 2 W Rohnert Park, CA | UP TO 4 FOOT HIGH WATER ON ROADWAY. SMALL VEHICLES STUCK IN FLOOD WATERS NR ROHNERT PARK EXPRESSWAY / STONY POINT RD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Oakland, CA (KOAK), launched 00:00Z, 1.1 hours before the alert went out and 84 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
- 3 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 436 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 336 m²/s²
- 0-3 km storm-relative helicity
- 481 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
920
WGUS56 KMTR 160108
FFWMTR
CAC041-097-160400-
/O.NEW.KMTR.FF.W.0019.161216T0108Z-161216T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
508 PM PST THU DEC 15 2016
The National Weather Service in The San Francisco Bay Area has issued
a
* Flash Flood Warning for...
Southeastern Sonoma County in northern California...
Northern Marin County in northern California...
* Until 800 PM PST
* At 503 PM PST, although rain gauge reports indicate that much of
the intense rainfall across the warned area has passed, creek
gauges continue to show rising stages or creek levels remaining
above flood stages at many locations.
Automated stream gages have reported water levels remaining above
flood stage in Petaluma area creeks, Sonoma Creek at Agua Caliente,
and in the lower Laguna de Santa Rosa. There have also been reports
of flooding in other lowland valley settings in southern Sonoma
County and northern Marin County, as well as roadway flooding.
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 3857 12264 3839 12247 3816 12240 3813 12249
3816 12272 3825 12297 3837 12307 3848 12290
3856 12282
$$
MWS1 follow-up statement
299
WGUS76 KMTR 160357
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
757 PM PST THU DEC 15 2016
CAC041-097-160407-
/O.EXP.KMTR.FF.W.0019.000000T0000Z-161216T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sonoma CA-Marin CA-
757 PM PST THU DEC 15 2016
...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SONOMA AND NORTHERN MARIN
COUNTIES WILL EXPIRE AT 800 PM PST...
Flooding is no longer expected to pose a threat. Please continue to
heed any remaining road closures.
LAT...LON 3857 12264 3839 12247 3816 12240 3813 12249
3816 12272 3825 12297 3837 12307 3848 12290
3856 12282
$$
rwwThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 4:13 PM PST | Flash Flood Warning | MTR | Marin | 3 hr |
| Dec 15, 4:16 PM PST | Areal Flood Advisory | MTR | Marin, Napa, Sonoma | 3 hr |
| Dec 15, 4:58 PM PST | Areal Flood Advisory | MTR | Santa Clara, Santa Cruz | 4 hr |
| Dec 15, 5:27 PM PST | Areal Flood Advisory | MTR | San Mateo, Santa Cruz | 3 hr |
| Dec 15, 5:29 PM PST | Flash Flood Warning | MTR | Santa Clara | 46 min |
| Dec 15, 5:46 PM PST | Areal Flood Advisory | MTR | Alameda, Contra Costa | 3 hr |
| Dec 15, 6:12 PM PST | Flash Flood Warning | MTR | Santa Clara | 3 hr |
| Dec 15, 6:16 PM PST | Flash Flood Warning | MTR | Monterey | 6 hr |
| Dec 15, 6:38 PM PST | Flash Flood Warning | MTR | San Mateo, Santa Clara, Santa Cruz | 4 hr |
| Dec 15, 7:20 PM PST | Areal Flood Advisory | MTR | Monterey, San Benito | 3 hr |
| Dec 15, 9:02 PM PST | Small Craft Advisory | MTR | 48 hr | |
| Dec 16, 2:43 AM PST | Small Craft Advisory | MTR | 18 hr | |
| Dec 16, 7:14 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Monterey, San Mateo, Santa Clara, Santa Cruz | 25 hr |
| Dec 16, 7:14 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, City and County of San Francisco, San Mateo and 3 more | 49 hr |
| Dec 16, 7:14 AM PST | Freeze Warning | MTR | Marin, Napa, Sonoma | 25 hr |
| Dec 16, 7:14 AM PST | Freeze Warning | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 49 hr |
Nearby
Flash Flood Warnings in California, 2016Every flash flood warning in 2016
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.