Alert archive / California / Flood Watches in 2008

Flood Watch 1, NWS San Francisco Bay Area, CA

January 24, 200811 counties in California

NWS San Francisco Bay Area, CA issued this flood watch at Jan 24, 2008, 1:34 PM PST for 11 counties in California. It took effect at Jan 25, 2008, 4:53 AM PST. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Jan 24, 2008, 1:34 PM PST (21:34 UTC)
In effect from: Jan 25, 2008, 4:53 AM PST
Expired: Jan 26, 2008, 2:03 AM PST
In force: 21 hr
Issued by: NWS San Francisco Bay Area, CA
Flood severity: None

Counties Alameda County, CA, City and County of San Francisco, CA, Contra Costa County, CA, Marin County, CA, Monterey County, CA, Napa County, CA, San Benito County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Sonoma County, CA

The radar

The San Francisco radar (KMUX), 46 km from the middle of the area, began a volume at 21:36 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 12:00Z, 9.6 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 647 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Francisco Bay Area, CA wrote its last area forecast discussion before this flood watch went out at Jan 24, 9:52 AM PST, 3 hours 42 minutes earlier.

Area forecast discussion, Jan 24, 9:52 AM PST, 3 hours 42 minutes before

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Hazardous weather outlook, Jan 24, 8:35 AM PST, 4 hours 59 minutes before

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In the hours before

Local storm report, Jan 24, 9:22 AM PST, 4 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
922 AM PST THU JAN 24 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0913 AM     SNOW             4 SSW CAMPBELL          37.23N 121.99W
01/24/2008  M4.0 INCH        SANTA CLARA        CA   TRAINED SPOTTER

            MEASURED AT 3000 FEET. 4 INCHES NEW. 12 INCHES ON GROUND.

0913 AM     SNOW             12 SE CARMEL VALLEY VIL 36.35N 121.59W
01/24/2008  E6.0 INCH        MONTEREY           CA   PUBLIC

            MEASURED AT 3500 FEET. 6 INCHES NEW. 24 INCHES ON GROUND.

&&

STEVE ANDERSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 24, 8:06 AM PST	Snow Advisory	MTR	Monterey, San Benito, San Mateo, Santa Clara, Santa Cruz	23 hr
Jan 24, 1:59 PM PST	Wind Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, San Benito, City and County of San Francisco and 4 more	38 hr

Nearby

Flood Watches in California, 2008 Every flood watch in 2008

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.