Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 17, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 10, 2017, 2:08 PM PST for Napa County, California. It was in force for 6 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
- Jan 10, 2017, 2:08 PM PST (22:08 UTC)
- Expired
- Jan 10, 2017, 8:00 PM PST
- In force
- 6 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), 65 km from the middle of the area, began a volume at 22:12 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 |
|---|---|---|---|
| Jan 10, 5:13 PM PST | FLOOD | 3 N Napa, CA | BIG RANCH RD COMPLETELY UNDER WATER AT SALVADOR AVE |
| Jan 10, 5:13 PM PST | FLOOD | 4 N Napa, CA | SILVERADO TRAIL FOODING AT TRANCAS ST |
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 12:00Z, 10.1 hours before the alert went out and 74 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
- 8 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 604 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 191 m²/s²
- 0-3 km storm-relative helicity
- 263 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
977
WGUS56 KMTR 102208
FFWMTR
CAC055-110400-
/O.NEW.KMTR.FF.W.0017.170110T2208Z-170111T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
208 PM PST TUE JAN 10 2017
The National Weather Service in The San Francisco Bay Area has issued
a
* Flash Flood Warning for...
Southwestern Napa County in northern California...
* Until 800 PM PST
* At 205 PM PST, Doppler radar indicated heavy rain across the
warned area. Most stream gaging sites in the area are indicating
that water levels are quickly rising, and many sites have reached
Monitor Stage. Flash flooding is expected to begin shortly, and
rainfall is expected to continue through the afternoon and evening
hours.
* Some locations that will experience flooding include...
Napa, American Canyon, St. Helena, Calistoga, Yountville, Deer Park
and Angwin.
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 3849 12235 3842 12223 3816 12222 3816 12232
3822 12236 3825 12237 3828 12240 3831 12240
3833 12241 3837 12246 3838 12245 3843 12250
3845 12248 3847 12253 3859 12259 3860 12248
$$
MWS1 follow-up statement
753
WGUS76 KMTR 110354
FFSMTR
Flash Flood Statement
National Weather Service San Francisco CA
754 PM PST TUE JAN 10 2017
CAC055-110400-
/O.EXP.KMTR.FF.W.0017.000000T0000Z-170111T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Napa CA-
754 PM PST TUE JAN 10 2017
...THE FLASH FLOOD WARNING FOR SOUTHWESTERN NAPA COUNTY WILL EXPIRE
AT 800 PM PST...
At 7:50 PM PST, heavy rainfall continues to diminish across the
region and the threat for flash flooding has ended. However, run-off
from recent rainfall continues to result in flooding of low lying
areas and an Areal Flood Warning will be posted for this threat.
Please continue to heed any remaining road closures.
LAT...LON 3849 12235 3842 12223 3816 12222 3816 12232
3822 12236 3825 12237 3828 12240 3831 12240
3833 12241 3837 12246 3838 12245 3843 12250
3845 12248 3847 12253 3859 12259 3860 12248
$$
RGassThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 9, 9:10 PM PST | Small Craft Advisory for Rough Bar | MTR | 24 hr | |
| Jan 10, 2:25 AM PST | River Flood Warning | MTR | Napa | 25 hr |
| Jan 10, 2:25 AM PST | River Flood Warning | MTR | Napa | 31 hr |
| Jan 10, 8:38 AM PST | Gale Warning | MTR | 12 hr | |
| Jan 10, 10:56 AM PST | Areal Flood Warning | MTR | Sonoma | 48 hr |
| Jan 10, 11:29 AM PST | Areal Flood Warning | MTR | Monterey, Santa Cruz | 48 hr |
| Jan 10, 12:18 PM PST | Flash Flood Warning | MTR | Sonoma | 6 hr |
| Jan 10, 12:40 PM PST | Flash Flood Warning | MTR | Santa Clara | 6 hr |
| Jan 10, 2:27 PM PST | Flash Flood Warning | MTR | Marin | 6 hr |
| Jan 10, 2:51 PM PST | Areal Flood Warning | MTR | Santa Clara | 36 hr |
| Jan 10, 2:55 PM PST | Areal Flood Advisory | MTR | San Mateo, Santa Clara | 2 hr |
| Jan 10, 3:07 PM PST | Small Craft Advisory | MTR | 60 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.