Alert archive / California / Flash Flood Warnings in 2017

Flash Flood Warning 22, NWS San Francisco Bay Area, CA

January 10, 2017Santa Cruz County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 10, 2017, 10:53 PM PST for Santa Cruz County, California. It was in force for 6 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
Jan 10, 2017, 10:53 PM PST (06:53 UTC)
Expired
Jan 11, 2017, 4:45 AM PST
In force
6 hr
Issued by
NWS San Francisco Bay Area, CA
Area
Storm-based polygon
Flood severity
None

County Santa Cruz County, CA

The radar

The San Francisco radar (KMUX), 20 km from the middle of the area, began a volume at 06:56 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, 6.9 hours before the alert went out and 77 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 2017-01-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 40 joules per kilogram.LCLLFCEL10008507005003002001001 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 2017-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 245 square meters per square second.1939587897117136156Sfc1 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
40 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
585 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
245 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

834 
WGUS56 KMTR 110653
FFWMTR
CAC087-111245-
/O.NEW.KMTR.FF.W.0022.170111T0653Z-170111T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
1053 PM PST TUE JAN 10 2017

The National Weather Service in The San Francisco Bay Area has issued
a

* Flash Flood Warning for...
  Central Santa Cruz County in northern California...

* Until 445 AM PST

* At 1052 PM PST, emergency management officials reported flooding
  is occurring in the warned area. 

* Some locations that will experience flooding include...
  Felton Grove and Paradise Park. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3699 12208 3711 12213 3712 12208 3701 12202

$$

WB
1 follow-up statement
341 
WGUS76 KMTR 111236
FFSMTR

Flash Flood Statement
National Weather Service San Francisco CA
436 AM PST WED JAN 11 2017

CAC087-111245-
/O.EXP.KMTR.FF.W.0022.000000T0000Z-170111T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Santa Cruz CA-
436 AM PST WED JAN 11 2017

...THE FLASH FLOOD WARNING FOR CENTRAL SANTA CRUZ COUNTY WILL EXPIRE
AT 445 AM PST...

The heavy rain has ended. Flood waters are receeding. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.

LAT...LON 3699 12208 3711 12213 3712 12208 3701 12202

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 10, 4:26 PM PSTAreal Flood WarningMTRSonoma24 hr
Jan 10, 5:46 PM PSTAreal Flood AdvisoryMTRCity and County of San Francisco, San Mateo4 hr
Jan 10, 6:18 PM PSTAreal Flood WarningMTRSonoma12 hr
Jan 10, 6:41 PM PSTAreal Flood WarningMTRSanta Clara15 hr
Jan 10, 7:26 PM PSTFlash Flood WarningMTRSanta Cruz3 hr
Jan 10, 7:59 PM PSTAreal Flood WarningMTRNapa12 hr
Jan 10, 8:01 PM PSTFlash Flood WarningMTRAlameda10 hr
Jan 10, 8:28 PM PSTAreal Flood WarningMTRMarin12 hr
Jan 10, 8:43 PM PSTSpecial Weather StatementMTRSanta Cruz47 min
Jan 10, 8:45 PM PSTSpecial Marine WarningMTR30 min
Jan 10, 9:03 PM PSTGale WarningMTR5 hr
Jan 10, 9:03 PM PSTSmall Craft Advisory for Rough BarMTR36 hr
Jan 10, 9:03 PM PSTSmall Craft AdvisoryMTR5 hr
Jan 10, 9:14 PM PSTFlash Flood WarningMTRMonterey9 hr
Jan 10, 9:20 PM PSTSpecial Marine WarningMTR40 min
Jan 10, 10:07 PM PSTAreal Flood AdvisoryMTRSanta Clara5 hr
Jan 10, 11:07 PM PSTAreal Flood AdvisoryMTRCity and County of San Francisco, San Mateo113 min
Jan 10, 11:43 PM PSTSpecial Marine WarningMTR32 min
Jan 10, 11:50 PM PSTAreal Flood AdvisoryMTRAlameda, Contra Costa115 min
Jan 11, 12:27 AM PSTAreal Flood AdvisoryMTRSan Mateo4 hr
Jan 11, 12:45 AM PSTRiver Flood WarningMTRMonterey15 hr
Jan 11, 6:03 AM PSTFlash Flood WarningMTRMonterey3 hr
Jan 11, 7:43 AM PSTAreal Flood WarningMTRSan Benito, Santa Clara12 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.