Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 5, NWS San Francisco Bay Area, CA

March 5, 2016Sonoma County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Mar 5, 2016, 10:50 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 5, 2016, 10:50 PM PST (06:50 UTC)
Expired
Mar 6, 2016, 2:45 AM 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), 87 km from the middle of the area, began a volume at 06:50 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 00:00Z, 6.8 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.

Skew-T log-pSkew-T log-p diagram, Oakland, CA at 00:00Z on 2016-03-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2016-03-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 198 square meters per square second.19395878Sfc1 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
31 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
748 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
198 m²/s²
0-3 km storm-relative helicity
207 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

036 
WGUS56 KMTR 060650
FFWMTR
CAC097-061045-
/O.NEW.KMTR.FF.W.0005.160306T0650Z-160306T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1050 PM PST SAT MAR 5 2016

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

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN SONOMA COUNTY IN NORTHERN CALIFORNIA...

* UNTIL 245 AM PST
    
* AT 1046 PM PST...RIVER GAUGE REPORTS INDICATED THE WILLOW BROOK AT
  PENNGROVE PARK HAD EXCEEDED FLOOD STAGE. FLASH FLOODING IS
  EXPECTED TO CONTINUE ALONG THE WILLOW BROOK IN NORTHERN PETALUMA
  FOR THE NEXT TWO TO FOUR HOURS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  NORTHERN PETALUMA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. DO NOT ATTEMPT TO CROSS FLOODED ROADWAYS
WITH YOUR AUTOMOBILE. TURN AROUND...DON'T DROWN.

&&

LAT...LON 3832 12263 3827 12261 3826 12266 3830 12269

$$

DYKEMA
1 follow-up statement
772 
WGUS76 KMTR 061025
FFSMTR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
225 AM PST SUN MAR 6 2016

CAC097-061033-
/O.CAN.KMTR.FF.W.0005.000000T0000Z-160306T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SONOMA CA-
225 AM PST SUN MAR 6 2016

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SONOMA COUNTY IS
CANCELLED...

THE WILLOW BROOK AT PENNGROVE PARK IN SONOMA COUNTY HAS FALLEN BELOW
FLOOD STAGE. HEAVY RAIN IS NO LONGER EXPECTED. THEREFORE...THE FLASH
FLOOD WARNING HAS BEEN CANCELLED. PLEASE CONTINUE TO HEED ALL ROAD
CLOSURES.

LAT...LON 3832 12263 3827 12261 3826 12266 3830 12269

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 5, 4:17 PM PSTAreal Flood AdvisoryMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more6 hr
Mar 5, 9:07 PM PSTSmall Craft AdvisoryMTR54 hr
Mar 5, 9:59 PM PSTFlash Flood WarningMTRNapa3 hr
Mar 5, 10:14 PM PSTFlash Flood WatchMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more5 hr
Mar 5, 10:27 PM PSTFlash Flood WarningMTRSanta Cruz4 hr
Mar 5, 10:41 PM PSTFlash Flood WarningMTRAlameda4 hr
Mar 5, 11:46 PM PSTFlash Flood WarningMTRSanta Cruz3 hr
Mar 6, 12:12 AM PSTFlash Flood WarningMTRSanta Cruz108 min
Mar 6, 2:24 AM PSTGale WarningMTR23 hr
Mar 6, 2:24 AM PSTSmall Craft AdvisoryMTR13 hr
Mar 6, 4:57 AM PSTWind AdvisoryMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more23 hr
Mar 6, 5:16 AM PSTFlash Flood WatchMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more23 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.