Alert archive / California / Flash Flood Warnings in 1986

Flash Flood Warning 13, NWS San Francisco Bay Area, CA

February 17, 1986Alameda County, Contra Costa County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 17, 1986, 7:00 PM PST for Alameda County, Contra Costa County, California. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued
Feb 17, 1986, 7:00 PM PST (03:00 UTC)
Expired
Feb 18, 1986, 9:00 AM PST
In force
14 hr
Issued by
NWS San Francisco Bay Area, CA
Area
Whole counties

Counties Alameda County, CA, Contra Costa 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, 3.0 hours before the alert went out and 24 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 1986-02-18Temperature 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 1986-02-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 413 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
523 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
413 m²/s²
0-3 km storm-relative helicity
515 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 17, 7:00 PM PSTFlash Flood WarningMTRSan Mateo, Santa Clara, Santa Cruz14 hr
Feb 17, 7:00 PM PSTFlash Flood WarningMTRMarin14 hr
Feb 17, 7:00 PM PSTFlash Flood WarningMTRMonterey14 hr
Feb 17, 7:00 PM PSTFlash Flood WarningMTRNapa, Sonoma14 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.