Alert archive / California / Flash Flood Warnings in 2016
Flash Flood Warning 17, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Dec 15, 2016, 3:38 PM PST for Napa 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
- Dec 15, 2016, 3:38 PM PST (23:38 UTC)
- Expired
- Dec 15, 2016, 6:30 PM PST
- In force
- 3 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Napa County, CA
The radar
The Sacramento radar (KDAX), 59 km from the middle of the area, began a volume at 23:41 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, 11.6 hours before the alert went out and 70 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 767 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 276 m²/s²
- 0-3 km storm-relative helicity
- 311 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
359
WGUS56 KMTR 152338
FFWMTR
CAC055-160230-
/O.NEW.KMTR.FF.W.0017.161215T2338Z-161216T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
338 PM PST THU DEC 15 2016
The National Weather Service in The San Francisco Bay Area has issued
a
* Flash Flood Warning for...
Southwestern Napa County in northern California...
* Until 630 PM PST
* At 335 PM PST, gauge reports indicated heavy rain falling across
the warned area. Flash flooding is already occurring.
Flooding is already occurring or is expected to occur in many Napa
River tributary creeks and on the Napa River mainstem. This Flash
Flood Warning supplements the previously issued Flood Warning for
the Napa River near St. Helena.
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 3834 12220 3827 12221 3827 12222 3826 12221
3816 12222 3816 12233 3832 12238 3847 12247
3860 12264 3868 12251
$$
MWS2 follow-up statements
716
WGUS76 KMTR 160059
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
459 PM PST THU DEC 15 2016
CAC055-160230-
/O.CON.KMTR.FF.W.0017.000000T0000Z-161216T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Napa CA-
459 PM PST THU DEC 15 2016
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PST FOR
SOUTHWESTERN NAPA COUNTY...
At 458 PM PST, gauge reports indicated that heavy rain was falling
over the warned area. Flash flooding is already occurring.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 3834 12220 3827 12221 3827 12222 3826 12221
3816 12222 3816 12233 3832 12238 3847 12247
3860 12264 3868 12251
$$
rww307
WGUS76 KMTR 160229
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
629 PM PST THU DEC 15 2016
CAC055-160238-
/O.EXP.KMTR.FF.W.0017.000000T0000Z-161216T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Napa CA-
629 PM PST THU DEC 15 2016
...THE FLASH FLOOD WARNING FOR SOUTHWESTERN NAPA COUNTY WILL EXPIRE
AT 630 PM PST...
Flooding is no longer expected to pose a threat. Please continue to
heed any remaining road closures.
LAT...LON 3834 12220 3827 12221 3827 12222 3826 12221
3816 12222 3816 12233 3832 12238 3847 12247
3860 12264 3868 12251
$$
WPThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 14, 6:07 PM PST | Areal Flood Advisory | MTR | Marin, Napa, Sonoma | 12 hr |
| Dec 15, 3:06 AM PST | Small Craft Advisory | MTR | 3 days | |
| Dec 15, 3:40 AM PST | Wind Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, San Benito, San Mateo and 3 more | 21 hr |
| Dec 15, 10:24 AM PST | Areal Flood Advisory | MTR | Marin, Napa, Sonoma | 6 hr |
| Dec 15, 12:57 PM PST | Flash Flood Warning | MTR | Marin, Sonoma | 4 hr |
| Dec 15, 3:12 PM PST | Areal Flood Advisory | MTR | Alameda, Contra Costa | 4 hr |
| Dec 15, 3:16 PM PST | Areal Flood Advisory | MTR | City and County of San Francisco, San Mateo | 4 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.