Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 12, NWS San Francisco Bay Area, CA

March 11, 2016Sonoma County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Mar 11, 2016, 12:15 AM PST for Sonoma 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
Mar 11, 2016, 12:15 AM PST (08:15 UTC)
Expired
Mar 11, 2016, 3:15 AM PST
In force
3 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), 105 km from the middle of the area, began a volume at 08:14 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, 8.3 hours before the alert went out and 104 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 2016-03-11Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 00:00Z on 2016-03-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 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
774 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

486 
WGUS56 KMTR 110815
FFWMTR
CAC097-111115-
/O.NEW.KMTR.FF.W.0012.160311T0815Z-160311T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1215 AM PST FRI MAR 11 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 315 AM PST

* AT 1211 AM PST...STREAM GAUGE REPORTS INDICATED FLASH FLOODING IS
  CONTINUING TO OCCUR.  KMUX DOPPLER RADAR IS SHOWING ADDITIONAL
  RAIN HEADED TOWARDS THE WARNING AREA.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  THE MARK WEST AREA NEAR MIRABEL HEIGHTS.

FLOOD WATERS ARE CONTINUING TO MOVE DOWN MARK WEST CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3849 12289 3851 12293 3851 12291 3850 12288
      3850 12284 3847 12283

$$

BLIER
1 follow-up statement
591 
WGUS76 KMTR 111113
FFSMTR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
313 AM PST FRI MAR 11 2016

CAC097-111121-
/O.EXP.KMTR.FF.W.0012.000000T0000Z-160311T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SONOMA CA-
313 AM PST FRI MAR 11 2016

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SONOMA COUNTY WILL EXPIRE
AT 315 AM PST...

AS OF 03:14 AM PST...FLOOD WATERS IN THE MARK WEST AREA NEAR MIRABEL
HEIGHTS ARE RECEDING...AND ARE NO LONGER EXPECTED TO POSE A THREAT
TO LIFE OR PROPERTY. THEREFORE THE FLASH FLOOD WARNING WILL BE
ALLOWED TO EXPIRE. MORE MINOR NUISANCE FLOODING IS STILL POSSIBLE
HOWEVER...AS WELL AS PONDING OF WATER ON ROADWAYS. PLEASE USE
CAUTION WHEN DRIVING AND CONTINUE TO HEED ANY ROAD CLOSURES.

RAIN RATES MAY AGAIN INCREASE TOWARDS MORNING AND SO PERSONS IN AND
AROUND THIS AREA NEED TO REMAIN ALERT IN THE EVENT A NEW FLASH FLOOD
WARNING IS ISSUED.

LAT...LON 3849 12289 3851 12293 3851 12291 3850 12288
      3850 12284 3847 12283

$$

BLIER

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 10, 4:56 PM PSTAreal Flood AdvisoryMTRAlameda, Contra Costa, Marin, Napa, City and County of San Francisco, San Mateo and 1 more4 hr
Mar 10, 7:54 PM PSTFlash Flood WarningMTRSonoma4 hr
Mar 10, 8:15 PM PSTFlash Flood WarningMTRSonoma4 hr
Mar 10, 8:20 PM PSTRiver Flood WarningMTRNapa24 hr
Mar 11, 3:04 AM PSTGale WarningMTR18 hr
Mar 11, 3:04 AM PSTSmall Craft AdvisoryMTR18 hr
Mar 11, 3:28 AM PSTWind AdvisoryMTRAlameda, Contra Costa, Marin, Monterey, San Benito, City and County of San Francisco and 4 more18 hr
Mar 11, 8:44 AM PSTSpecial Marine WarningMTR46 min
Mar 11, 8:50 AM PSTFlash Flood WarningMTRMonterey3 hr
Mar 11, 8:59 AM PSTAreal Flood AdvisoryMTRMonterey, Santa Cruz2 hr
Mar 11, 9:10 AM PSTSpecial Weather StatementMTRSanta Cruz50 min
Mar 11, 10:28 AM PSTSpecial Weather StatementMTRSan Mateo47 min
Mar 11, 10:40 AM PSTSevere Thunderstorm WarningMTRSan Mateo, Santa Cruz20 min
Mar 11, 11:02 AM PSTAreal Flood AdvisoryMTRMonterey, Santa Cruz118 min

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.