Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 9, NWS San Francisco Bay Area, CA

March 10, 2016Sonoma County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Mar 10, 2016, 3:57 PM PST for 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
Mar 10, 2016, 3:57 PM PST (23:57 UTC)
Expired
Mar 10, 2016, 8:00 PM PST
In force
4 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), 88 km from the middle of the area, began a volume at 23:55 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, 12.0 hours before the alert went out and 71 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.

Skew-T log-pSkew-T log-p diagram, Oakland, CA at 12:00Z on 2016-03-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 12:00Z on 2016-03-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1281 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
312 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

324 
WGUS56 KMTR 102357
FFWMTR
CAC097-110400-
/O.NEW.KMTR.FF.W.0009.160310T2357Z-160311T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
357 PM PST THU MAR 10 2016

THE NATIONAL WEATHER SERVICE IN THE SAN FRANCISCO BAY AREA HAS ISSUED
A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL SONOMA COUNTY IN NORTHERN CALIFORNIA...

* UNTIL 800 PM PST

* AT 354 PM PST...GAUGE REPORTS INDICATED HEAVY RAIN FALLING ACROSS
  THE WARNED AREA. FLASH FLOODING IS EXPECTED TO CONTINUE
  THROUGH THE EVENING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  FROM PENNGROVE SOUTHEAST INTO PETALUMA.

FLOOD WATERS ARE MOVING DOWN WILLOW BROOK CREEK FROM PENNGROVE PARK
TO OLD REDWOOD HIGHWAY BRIDGE AND STONY POINT ROAD. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3829 12264 3826 12264 3823 12260 3822 12262
      3827 12269 3830 12266

$$

LARRY

The office that day

Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 10, 2:41 AM PSTSmall Craft AdvisoryMTR24 hr
Mar 10, 8:35 AM PSTAreal Flood AdvisoryMTRMarin, Napa, Sonoma3 hr
Mar 10, 10:05 AM PSTAreal Flood AdvisoryMTRMarin, Napa, Sonoma115 min
Mar 10, 11:43 AM PSTAreal Flood AdvisoryMTRMarin, Napa, Sonoma3 hr
Mar 10, 12:02 PM PSTFlash Flood WarningMTRSonoma4 hr
Mar 10, 3:48 PM PSTRiver Flood WarningMTRNapa, Sonoma281 days

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.