Alert archive / California / Flash Flood Warnings in 1997

Flash Flood Warning 27, NWS San Francisco Bay Area, CA

January 2, 1997Contra Costa County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 2, 1997, 11:45 AM PST for Contra Costa 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 counties it named.

The facts

Issued
Jan 2, 1997, 11:45 AM PST (19:45 UTC)
Expired
Jan 2, 1997, 4:00 PM PST
In force
4 hr
Issued by
NWS San Francisco Bay Area, CA
Area
Whole counties

County Contra Costa County, CA

The nearest sounding before it

Oakland, CA (KOAK), launched 12:00Z, 7.8 hours before the alert went out and 31 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 12:00Z on 1997-01-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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 12:00Z on 1997-01-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 148 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
2 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
474 m above ground
0-6 km bulk shear
79 kt
0-1 km storm-relative helicity
148 m²/s²
0-3 km storm-relative helicity
268 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
Jan 1, 5:03 PM PSTFlash Flood WarningMTRSanta Clara117 min
Jan 1, 7:00 PM PSTFlash Flood WarningMTRSan Mateo, Santa Clara, Santa Cruz4 hr
Jan 1, 7:22 PM PSTFlash Flood WarningMTRSan Luis Obispo6 hr
Jan 1, 10:59 PM PSTFlash Flood WarningMTRSan Mateo, Santa Clara, Santa Cruz3 hr
Jan 2, 5:52 AM PSTFlash Flood WarningMTRSan Mateo, Santa Clara, Santa Cruz3 hr
Jan 2, 5:52 AM PSTFlash Flood WarningMTRAlameda, Contra Costa3 hr
Jan 2, 11:45 AM PSTFlash Flood WarningMTRAlameda, San Mateo, Santa Clara, Santa Cruz4 hr
Jan 2, 11:45 AM PSTFlash Flood WarningMTRMonterey4 hr

Nearby

Flash Flood Warnings in California, 1997Every flash flood warning in 1997

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.