Alert archive / California / Areal Flood Warnings in 2017

Areal Flood Warning 45, NWS San Francisco Bay Area, CA

February 23, 2017Monterey County, California

NWS San Francisco Bay Area, CA issued this areal flood warning at Feb 23, 2017, 1:20 PM PST for Monterey County, California. It was in force for 9 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 23, 2017, 1:20 PM PST (21:20 UTC)
Expired
Feb 23, 2017, 10:15 PM PST
In force
9 hr
Issued by
NWS San Francisco Bay Area, CA
Area
Storm-based polygon
Flood severity
None

County Monterey County, CA

The radar

The San Francisco radar (KMUX), 115 km from the middle of the area, began a volume at 21:26 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, 9.3 hours before the alert went out and 184 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 2017-02-23Temperature 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 12:00Z on 2017-02-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 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
1618 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
59 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 areal flood warning 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 areal flood warning went out at Feb 23, 9:40 AM PST, 3 hours 40 minutes earlier.

Area forecast discussion, Feb 23, 9:40 AM PST, 3 hours 40 minutes before
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Hazardous weather outlook, Feb 23, 12:10 PM PST, 1 hour 10 minutes before
Hazardous Weather Outlook
National Weather Service San Francisco CA
1210 PM PST Thu Feb 23 2017

CAZ006-505>513-516>518-528>530-242015-
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Southern Salinas Valley/Arroyo Seco and Lake San Antonio-
Santa Lucia Mountains and Los Padres National Forest-
Mountains Of San Benito County And Interior Monterey County
Including Pinnacles National Park-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
1210 PM PST Thu Feb 23 2017

This Hazardous Weather Outlook is for portions of western
California.

.DAY ONE...This Afternoon and Tonight

Chilly overnight temperatures can be expected tonight along with
patchy frost.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

A system will bring showers to our region Saturday into Monday,
although amounts should generally be light. Snow levels will be
low, so locations above 3000 feet could see several inches of
accumulation.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 22, 8:16 PM PSTAreal Flood WarningMTRSonoma12 hr
Feb 23, 3:39 PM PSTFlood WatchMTRMonterey, San Benito18 hr

Nearby

Areal Flood Warnings in California, 2017Every areal flood warning in 2017

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.