Alert archive / California / Flash Flood Warnings in 1986

Flash Flood Warning 4, NWS San Francisco Bay Area, CA

February 16, 1986Marin County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 16, 1986, 5:00 PM PST for Marin County, California. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Feb 16, 1986, 5:00 PM PST (01:00 UTC)
Expired
Feb 17, 1986, 1:00 AM PST
In force
8 hr
Issued by
NWS San Francisco Bay Area, CA
Area
Whole counties

County Marin County, CA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Oakland, CA (KOAK), launched 00:00Z, 1.0 hours before the alert went out and 60 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 1986-02-17Temperature 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 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 1986-02-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 334 square meters per square second.1939587897Sfc1 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
518 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
334 m²/s²
0-3 km storm-relative helicity
611 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 16, 5:00 PM PSTFlash Flood WarningMTRNapa, Sonoma8 hr
Feb 17, 10:20 AM PSTFlash Flood WarningMTRMarin, Sonoma14 hr
Feb 17, 10:20 AM PSTFlash Flood WarningMTRNapa14 hr
Feb 17, 12:30 PM PSTFlash Flood WarningMTRSan Mateo, Santa Clara, Santa Cruz12 hr
Feb 17, 2:40 PM PSTFlash Flood WarningMTRAlameda, Contra Costa9 hr

Nearby

Flash Flood Warnings in California, 1986Every flash flood warning in 1986

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.