Alert archive / California / Areal Flood Advisories in 2019

Areal Flood Advisory 21, NWS San Francisco Bay Area, CA

February 13, 2019Sonoma County, California

NWS San Francisco Bay Area, CA issued this areal flood advisory at Feb 13, 2019, 3:31 PM PST for Sonoma County, California. It was in force for 83 min.

The area

The counties it named.

The facts

Issued: Feb 13, 2019, 3:31 PM PST (23:31 UTC)
Expired: Feb 13, 2019, 4:54 PM PST
In force: 83 min
Issued by: NWS San Francisco Bay Area, CA
Area: Storm-based polygon

County Sonoma County, CA

The radar

The Sacramento radar (KDAX), 108 km from the middle of the area, began a volume at 23:34 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 11.5 hours before the alert went out and 428 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 479 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 657 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 advisory 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 advisory went out at Feb 13, 2:58 PM PST, 33 minutes earlier.

Area forecast discussion, Feb 13, 2:58 PM PST, 33 minutes before

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In the hours before

Local storm report, Feb 13, 12:37 PM PST, 2 hours 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1237 PM PST WED FEB 13 2019

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

0428 AM     NON-TSTM WND GST 9 NNE EAST FOOTHILLS    37.50N 121.74W
02/13/2019  M62 MPH          ALAMEDA            CA   MESONET

            MESONET STATION RSPC1, ROSE PEAK.

&&

PALMER

Local storm report, Feb 13, 12:41 PM PST, 2 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1241 PM PST WED FEB 13 2019

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

1235 PM     NON-TSTM WND DMG 1 S DEL MONTE FOREST    36.57N 121.95W
02/13/2019                   MONTEREY           CA   BROADCAST MEDIA

            TREE DOWN ON TWO CARS AND GUARD STATION AT
            COUNTRY CLUB GATE IN PEBBLE BEACH. EMPLOYEES
            REPORT NO INJURIES. ENTRANCE/EXIT IS CLOSED.

&&

PALMER

Local storm report, Feb 13, 2:08 PM PST, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
208 PM PST WED FEB 13 2019

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

0104 PM     NON-TSTM WND DMG 3 SSE DEL MONTE FOREST  36.55N 121.93W
02/13/2019                   MONTEREY           CA   BROADCAST MEDIA

            TREE DOWN CARMELO & 9TH.

0104 PM     NON-TSTM WND DMG 3 SSE DEL MONTE FOREST  36.55N 121.93W
02/13/2019                   MONTEREY           CA   BROADCAST MEDIA

            BRANCH DOWN ON CAR ON SCENIC RD S OF 10TH
            AVE.

1251 PM     NON-TSTM WND DMG 1 SSW CARMEL VALLEY VIL 36.47N 121.73W
02/13/2019                   MONTEREY           CA   LAW ENFORCEMENT

            TREE DOWN, ACROSS ENTIRE ROADWAY, 166 EL
            ECHO.

1245 PM     DEBRIS FLOW      2 W PORTOLA VALLEY      37.37N 122.25W
02/13/2019                   SAN MATEO          CA   BROADCAST MEDIA

            PART OF LA HONDA RD NEAR SKYLINE BLVD WASHED
            AWAY.

1245 PM     FLOOD            3 S SAN FRANCISCO       37.74N 122.41W
02/13/2019                   SAN FRANCISCO      CA   BROADCAST MEDIA

            ROADWAY FLOODING ON ALEMANY AT 101 & 280
            ENTRANCE.

1242 PM     DEBRIS FLOW      5 SE BLACKHAWK          37.78N 121.83W
02/13/2019                   CONTRA COSTA       CA   LAW ENFORCEMENT

            MUD SLIDE BLOCKING NORTHBOUND LANES.

1241 PM     NON-TSTM WND DMG 6 SE SAN JOSE           37.24N 121.77W
02/13/2019                   SANTA CLARA        CA   LAW ENFORCEMENT

            LARGE TREE ON THE RAMP, SB 85 TO SB 101.

&&

Local storm report, Feb 13, 2:58 PM PST, 33 minutes before

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Local storm report, Feb 13, 3:11 PM PST, 20 minutes before

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Local storm report, Feb 13, 3:31 PM PST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 13, 4:34 AM PST	Areal Flood Advisory	MTR	Sonoma	4 hr
Feb 13, 6:42 AM PST	Areal Flood Warning	MTR	Sonoma	9 hr
Feb 13, 8:28 AM PST	Areal Flood Advisory	MTR	Sonoma	2 hr
Feb 13, 9:28 AM PST	River Flood Warning	MTR	Napa	21 days
Feb 13, 10:42 AM PST	Special Weather Statement	MTR	San Mateo	18 min
Feb 13, 10:49 AM PST	Areal Flood Advisory	MTR	Alameda, Contra Costa, Marin, City and County of San Francisco, San Mateo	116 min
Feb 13, 12:15 PM PST	Special Weather Statement	MTR	Santa Clara	45 min
Feb 13, 12:28 PM PST	Areal Flood Advisory	MTR	San Mateo, Santa Clara, Santa Cruz	26 hr
Feb 13, 12:40 PM PST	Coastal Flood Advisory	MTR	Alameda, Contra Costa, Marin, Napa, City and County of San Francisco, San Mateo and 2 more	19 hr
Feb 13, 2:33 PM PST	Gale Warning	MTR		24 hr
Feb 13, 2:33 PM PST	Small Craft Advisory	MTR		12 hr
Feb 13, 2:35 PM PST	River Flood Warning	MTR	Santa Clara	3 hr
Feb 13, 2:35 PM PST	River Flood Warning	MTR	Napa	28 hr

Nearby

Areal Flood Advisories in California, 2019 Every areal flood advisory in 2019

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.