Alert archive / California / Flash Flood Warnings in 1998

Flash Flood Warning 32, NWS San Francisco Bay Area, CA

February 6, 1998Monterey County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 6, 1998, 8:42 AM PST for Monterey 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 counties it named.

The facts

Issued
Feb 6, 1998, 8:42 AM PST (16:42 UTC)
Expired
Feb 6, 1998, 2:45 PM PST
In force
6 hr
Issued by
NWS San Francisco Bay Area, CA
Area
Whole counties

County Monterey County, CA

The radar

The San Francisco radar (KMUX), 115 km from the middle of the area, began a volume at 16:43 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

Vandenberg AFB, CA (KVBG), launched 12:00Z, 4.7 hours before the alert went out and 183 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, Vandenberg AFB, CA at 12:00Z on 1998-02-06Temperature 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, Vandenberg AFB, CA at 12:00Z on 1998-02-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 424 square meters per square second.1939587897117136Sfc1 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
675 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
424 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 5, 4:00 PM PSTFlash Flood WarningMTRNapa, Sonoma8 hr
Feb 5, 4:00 PM PSTFlash Flood WarningMTRMarin8 hr
Feb 6, 9:38 AM PSTFlash Flood WarningMTRSan Mateo, Santa Clara5 hr
Feb 6, 11:45 AM PSTFlash Flood WarningMTRMarin, Sonoma3 hr
Feb 6, 2:02 PM PSTSevere Thunderstorm WarningMTRSanta Clara, Santa Cruz58 min
Feb 6, 2:44 PM PSTFlash Flood WarningMTRSonoma3 hr
Feb 6, 2:44 PM PSTFlash Flood WarningMTRSan Mateo3 hr

Nearby

Flash Flood Warnings in California, 1998Every flash flood warning in 1998

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.