San Mateo County, California
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The National Weather Service's Watches, Warnings and Advisories by state counties include: Thunderstorm, Tornado, Flood, Flash Flood, Winter Storm, High Wind, Gale, Small Aircraft, High Surf, Marine, Heat, Air Quality, Ashfall, Hazardous, and Special Statements.
Weather Alerts: San Mateo County, California
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Aviation Weather Warning
CAZ508-211100-

Airport Weather Warning
National Weather Service San Francisco Bay Area
425 AM PST Mon Feb 20 2017

...SFO AIRPORT WEATHER WARNING FOR STRONG AND GUSTY WINDS 00Z (4 PM
PST THIS AFTERNOON) TO 11Z (3 AM PST TUESDAY)...

POTENTIAL IS THERE FOR NEARLY ALL DAY STRONG LOW LEVEL WIND SHEAR
IN THE BAY AREA. AT KSFO SOUTH TO SOUTHEAST SURFACE WINDS REACHING
AIRPORT WEATHER WARNING CRITERIA OF 30 TO 40 KNOTS IN THE 00Z TO
11Z TIME-FRAME.

$$
Flash Flood Warning
CAC081-210330-
/O.NEW.KMTR.FF.W.0064.170221T0129Z-170221T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Francisco CA
529 PM PST MON FEB 20 2017

The National Weather Service in The San Francisco Bay Area has issued
a

* Flash Flood Warning for...
Northeastern San Mateo County in northern California...

* Until 730 PM PST

* At 524 PM PST, a stream gage on Belmont Creek near El Camino
Real highway in Belmont indicated flooding was occurring.

* Some locations that will experience flooding include...
Neighborhoods along Belmont Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you
can do so safely.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 3753 12223 3751 12227 3751 12228 3752 12229
3754 12226 3755 12225

$$

Flood Advisory
CAC081-210545-
/O.NEW.KMTR.FA.Y.0038.170221T0203Z-170221T0545Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Mateo CA-
603 PM PST MON FEB 20 2017

The National Weather Service in The San Francisco Bay Area has issued
a

* Small Stream Flood Advisory for...
Southwestern San Mateo County in northern California...

* Until 945 PM PST

* Runoff from an extended period of moderate to heavy rain has
caused sharp rises on streams and creeks in western San Mateo
County. At 5:37 PM PST the stream gage on the Pilarcitos Creek at
Half Moon Bay indicated a stage of 10.0 feet. Minor flooding
begins at 9.1 feet. In addition, stream gages on the San Gregorio
Creek at San Gregorio and the Pescadero Creek near Pescadero show
significant rises on these creeks, although both of these creeks
remain below flood stage. Rainfall has tapered off across western
San Mateo County and it is expected that these creeks will crest
soon and begin to recede within a few hours. In the meantime,
expect minor flooding along creeks in western San Mateo county.

* Some locations that will experience flooding include...
Locations along the Pilarcitos Creek, San Gregorio Creek and
Pescadero Creek in western San Mateo County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

&&

LAT...LON 3751 12249 3752 12241 3744 12235 3731 12230
3724 12230 3719 12240 3724 12242 3728 12241
3736 12240 3743 12244 3748 12245

$$
Flood Watch
CAZ006-505>513-516>518-528>530-210500-
/O.CON.KMTR.FA.A.0002.000000T0000Z-170221T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of...San Francisco...Tamalpais-Homestead...
Sausalito...Santa Rosa...South Santa Rosa...Napa...San Rafael...
Petaluma...Novato...Rohnert Park...Angwin...
Lagunitas-Forest Knolls...Woodacre...Oakland...Fremont...
Hayward...Daly City...Berkeley...Pacifica...Concord...Antioch...
Livermore...Walnut Creek...Pleasanton...Pittsburg...San Ramon...
Blackhawk...Scotts Valley...Boulder Creek...Day Valley...
San Jose...Greenfield...King City...Salinas...Santa Cruz...
Watsonville...Live Oak...Seaside...Monterey...Marina
512 AM PST Mon Feb 20 2017

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT...

The Flood Watch continues for

* A portion of western California...including the following
areas...Coastal North Bay Including Point Reyes National
Seashore...East Bay Hills and the Diablo Range...East Bay
Interior Valleys...Mountains Of San Benito County And Interior
Monterey County Including Pinnacles National Park...North Bay
Interior Valleys...North Bay Mountains...Northern Monterey
Bay...Northern Salinas Valley/Hollister Valley and Carmel
Valley...San Francisco...San Francisco Bay Shoreline...San
Francisco Peninsula Coast...Santa Clara Valley Including San
Jose...Santa Cruz Mountains...Santa Lucia Mountains and Los
Padres National Forest...Southern Monterey Bay and Big Sur
Coast and Southern Salinas Valley/Arroyo Seco and Lake San
Antonio.

* Through late tonight

* A prolonged period of moderate to heavy rainfall is anticipated
to fall on already saturated soils through Monday evening. This
will result in sharp rises on area creeks, streams and rivers and
will likely result in flooding.

* Impacts include enhanced runoff and associated flooding in low
lying areas and waterways, rising water levels and flooding on
area streams, creeks and rivers. Other impacts include increased
risk of rock/mud slides in steep terrain, downed trees and power
lines, and damaged to or washed out roadways.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

You should monitor later forecasts and be alert for possible
Flood Warnings. Those living in areas prone to flooding should be
prepared to take action should flooding develop.

&&

$$
High Wind Warning
CAZ006-505-507-509>512-517-518-529-530-210500-
/O.CON.KMTR.HW.W.0005.170220T2100Z-170221T1100Z/
/O.CON.KMTR.WI.Y.0012.000000T0000Z-170220T2100Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Mountains-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-
Santa Lucia Mountains and Los Padres National Forest-
Mountains Of San Benito County And Interior Monterey County
Including Pinnacles National Park-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
Including the cities of...San Francisco...Tamalpais-Homestead...
Sausalito...Angwin...Lagunitas-Forest Knolls...Woodacre...
Pacifica...Concord...Antioch...Livermore...Walnut Creek...
Pleasanton...Pittsburg...San Ramon...Blackhawk...Scotts Valley...
Boulder Creek...Day Valley...Santa Cruz...Watsonville...
Live Oak...Seaside...Monterey...Marina
523 AM PST Mon Feb 20 2017

...WIND ADVISORY REMAINS IN EFFECT UNTIL 1 PM PST THIS
AFTERNOON...
...HIGH WIND WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON
TO 3 AM PST TUESDAY...

* TIMING...Southeast winds increase through this morning and then
further intensify this afternoon. Strongest southerly winds
expected this afternoon and evening. Winds diminish late
tonight.

* WINDS...Sustained southerly winds 15 to 25 mph with gusts to 45
mph. Winds increasing to 25 to 40 mph this afternoon and evening
with gusts to 60 mph.

* IMPACTS...Winds may be strong enough to cause property damage.
Strong and gusty winds will make driving difficult, especially
for drivers of high profile vehicles. Saturated soils will also
contribute to an increased risk of downed trees and powerlines.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Advisory means that wind gusts of at least 45 mph are
expected. Winds this strong can make driving difficult...
especially for high profile vehicles. Use extra caution. Winds
this strong combined with saturated soils can result in downed
trees and power outages.

A High Wind Warning means a hazardous high wind event is expected
or occurring. Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

Wind Advisory
CAZ506-508-513-516-528-210500-
/O.CON.KMTR.WI.Y.0012.000000T0000Z-170221T1100Z/
North Bay Interior Valleys-San Francisco Bay Shoreline-
Santa Clara Valley Including San Jose-
Southern Salinas Valley/Arroyo Seco and Lake San Antonio-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Including the cities of...Santa Rosa...South Santa Rosa...Napa...
San Rafael...Petaluma...Novato...Rohnert Park...Oakland...
Fremont...Hayward...Daly City...Berkeley...San Jose...
Greenfield...King City...Salinas
523 AM PST Mon Feb 20 2017

...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 AM PST TUESDAY...

* TIMING...Southeast winds increase through this morning.
Strongest southerly winds expected this afternoon and evening.
Winds diminish late tonight.

* WINDS...Sustained southerly winds 15 to 25 mph with gusts to 45
mph. Winds increasing to 20 to 30 mph this afternoon and evening
with gusts to 50 mph.

* IMPACTS...Gusty winds will make driving difficult especially
for drivers of high profile vehicles. Saturated soils will
also contribute to an increased risk of downed trees and
powerlines.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Advisory means that wind gusts of at least 45 mph are
expected. Winds this strong can make driving difficult...
especially for high profile vehicles. Use extra caution. Winds
this strong combined with saturated soils can result in downed
trees and power outages.

&&

$$
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