weather.gov     
National Weather Service

Watches, Warnings & Advisories
NWS Homepage

High Surf Warning


Coastal Hazard Message
National Weather Service San Francisco Bay Area
337 AM PST Sat Dec 15 2018

...A powerful west to northwest swell, the largest seen this
season so far, will impact the coast Sunday into Monday with
breaking waves of 25 to 40 feet...

CAZ006-505-509-529-530-160700-
/O.CON.KMTR.SU.W.0002.181216T1700Z-181218T0500Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
337 AM PST Sat Dec 15 2018

...HIGH SURF WARNING REMAINS IN EFFECT FROM 9 AM SUNDAY TO 9 PM
PST MONDAY...

* WAVES AND SURF...A powerful west to northwest swell will create
  breakers of 25 to 40 feet, with breakers occasionally exceeding
  50 feet in spots.

* TIMING...Energetic waves will build through the day Sunday,
  peaking Sunday night into Monday morning. Waves will begin to
  gradually subside late Monday night into Tuesday.

* IMPACTS...Large breaking waves along the coast will lead to
  increased wave run-up on beaches with waves topping and washing
  over large rocks and jetties. They can easily move large logs
  and other beach debris and cause localized beach erosion.
  Localized coastal flooding is possible. Use extreme caution near
  the surf zone as these large waves will be capable of sweeping
  people into the frigid and turbulent ocean water. Cold water
  shock may cause cardiac arrest, and it also can cause an
  involuntary gasp reflex causing drowning, even for a good
  swimmer. The surf zone will be very dangerous due to strong
  currents and powerful breaking waves.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Warning indicates that dangerous, life threatening
waves will impact the shoreline. It is advised that people remain
off and well away from the shoreline during this event.

&&

$$


Small Craft Advisory For Rough Bar


URGENT - Marine Weather Message
National Weather Service San Francisco Bay Area
247 AM PST Sat Dec 15 2018

PZZ545-151900-
/O.EXT.KMTR.RB.Y.0017.000000T0000Z-181216T1400Z/
/O.EXT.KMTR.SC.Y.0247.000000T0000Z-181217T0200Z/
Point Reyes To Pigeon Point To 10 nm-
247 AM PST Sat Dec 15 2018

...SMALL CRAFT ADVISORY FOR ROUGH BAR NOW IN EFFECT UNTIL 6 AM
PST SUNDAY...
...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 6 PM PST SUNDAY...

* WINDS...Southeast 20 to 30 kt with gusts up to 40 kt.

* SEAS...6 to 11 feet.

* FIRST EBB...1.4 knots at 10:55 AM Saturday.

* SECOND EBB...1.5 knots at 10:37 PM Saturday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Small Craft Advisory means that wind speeds of 21 to 33 knots
and/or steep waves are expected to produce hazardous wave
conditions to small craft. Inexperienced mariners...especially
those operating smaller vessels should avoid navigating in these
conditions.

A Small Craft Advisory for rough bar means that wave conditions
are expected to be hazardous to small craft in or near harbor
entrances.

&&

$$


Small Craft Advisory


URGENT - Marine Weather Message
National Weather Service San Francisco Bay Area
247 AM PST Sat Dec 15 2018

PZZ545-151900-
/O.EXT.KMTR.RB.Y.0017.000000T0000Z-181216T1400Z/
/O.EXT.KMTR.SC.Y.0247.000000T0000Z-181217T0200Z/
Point Reyes To Pigeon Point To 10 nm-
247 AM PST Sat Dec 15 2018

...SMALL CRAFT ADVISORY FOR ROUGH BAR NOW IN EFFECT UNTIL 6 AM
PST SUNDAY...
...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 6 PM PST SUNDAY...

* WINDS...Southeast 20 to 30 kt with gusts up to 40 kt.

* SEAS...6 to 11 feet.

* FIRST EBB...1.4 knots at 10:55 AM Saturday.

* SECOND EBB...1.5 knots at 10:37 PM Saturday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Small Craft Advisory means that wind speeds of 21 to 33 knots
and/or steep waves are expected to produce hazardous wave
conditions to small craft. Inexperienced mariners...especially
those operating smaller vessels should avoid navigating in these
conditions.

A Small Craft Advisory for rough bar means that wave conditions
are expected to be hazardous to small craft in or near harbor
entrances.

&&

$$

URGENT - Marine Weather Message
National Weather Service San Francisco Bay Area
247 AM PST Sat Dec 15 2018

PZZ530-151900-
/O.NEW.KMTR.SC.Y.0248.181216T1800Z-181217T0200Z/
San Pablo Bay Suisun Bay The West Delta and San Francisco Bay
North of the Bay Bridge-
247 AM PST Sat Dec 15 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM TO 6 PM PST SUNDAY...

The National Weather Service in San Francisco has issued a Small
Craft Advisory, which is in effect from 10 AM to 6 PM PST Sunday.

* WINDS...South 15 to 25 kt with gusts up to 30 kt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Small Craft Advisory means that wind speeds of 21 to 33 knots
and/or steep waves are expected to produce hazardous wave
conditions to small craft. Inexperienced mariners...especially
those operating smaller vessels should avoid navigating in these
conditions.

&&

$$

URGENT - Marine Weather Message
National Weather Service San Francisco Bay Area
247 AM PST Sat Dec 15 2018

PZZ531-151900-
/O.NEW.KMTR.SC.Y.0248.181216T1800Z-181217T0200Z/
San Francisco Bay South of the Bay Bridge-
247 AM PST Sat Dec 15 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM TO 6 PM PST SUNDAY...

The National Weather Service in San Francisco has issued a Small
Craft Advisory, which is in effect from 10 AM to 6 PM PST Sunday.

* WINDS...Southeast 15 to 20 kt with gusts up to 25 kt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Small Craft Advisory means that wind speeds of 21 to 33 knots
and/or steep waves are expected to produce hazardous wave
conditions to small craft. Inexperienced mariners...especially
those operating smaller vessels should avoid navigating in these
conditions.

&&

$$

URGENT - Marine Weather Message
National Weather Service San Francisco Bay Area
247 AM PST Sat Dec 15 2018

PZZ540-151900-
/O.EXT.KMTR.SC.Y.0247.000000T0000Z-181217T0200Z/
Point Arena To Point Reyes To 10 nm-
247 AM PST Sat Dec 15 2018

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 6 PM PST SUNDAY...

* WINDS...Southeast 20 to 30 kt with gusts up to 40 kt.

* SEAS...10 to 15 feet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Small Craft Advisory means that wind speeds of 21 to 33 knots
and/or steep waves are expected to produce hazardous wave
conditions to small craft. Inexperienced mariners...especially
those operating smaller vessels should avoid navigating in these
conditions.

&&

$$

URGENT - Marine Weather Message
National Weather Service San Francisco Bay Area
247 AM PST Sat Dec 15 2018

PZZ571-151900-
/O.EXT.KMTR.SC.Y.0247.000000T0000Z-181217T0200Z/
Point Reyes to Pigeon Point 10 To 60 nm Offshore-
247 AM PST Sat Dec 15 2018

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 6 PM PST SUNDAY...

* WINDS...South 20 to 30 kt with gusts up to 40 kt.

* SEAS...9 to 14 feet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Small Craft Advisory means that wind speeds of 21 to 33 knots
and/or steep waves are expected to produce hazardous wave
conditions to small craft. Inexperienced mariners...especially
those operating smaller vessels should avoid navigating in these
conditions.

&&

$$


Wind Advisory


URGENT - WEATHER MESSAGE
National Weather Service Medford OR
510 AM PST Sat Dec 15 2018

...Moderate to Strong Winds Expected Later Today into Sunday...

.A strong area of low pressure in the Gulf of Alaska will bring
increasing southerly winds later today into Sunday.

CAZ081-160000-
/O.NEW.KMFR.WI.Y.0034.181216T0000Z-181217T0600Z/
/O.NEW.KMFR.HW.A.0013.181216T1200Z-181217T0000Z/
Central Siskiyou County-
Including the city of Weed
510 AM PST Sat Dec 15 2018

...WIND ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO 10 PM PST
SUNDAY...
...HIGH WIND WATCH IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
AFTERNOON...

The National Weather Service in Medford has issued a Wind
Advisory...which is in effect from 4 PM this afternoon to 10 PM
PST Sunday. A High Wind Watch has also been issued. This High
Wind Watch is in effect from late tonight through Sunday
afternoon.

* Winds...South 35 to 40 mph with gusts 45 to 55 mph. Stronger
  winds gusting 60 to 70 mph are possible Sunday.

* Timing...Late this afternoon through late Sunday evening. The
  High Wind Watch is for Sunday.

* Locations include...Most of the Shasta Valley from the town of
  Weed north to the Klamath River, including Interstate 5 and the
  portion of Highway 97 near Weed. The High Wind Watch is for the
  weed area north to between Grenada and Gazelle.

* Impacts...Strong winds may make travel difficult, especially for
  high profile vehicles. Loose items may be blown about. Property
  and tree damage is possible in the warning area.

* View the hazard area in detail at
  https://www.wrh.noaa.gov/mfr/HAZARD

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Advisory means that winds of 35 mph are expected with
higher gusts possible. Winds this strong can make driving
difficult, especially for high profile vehicles. Use extra
caution.

A High Wind Watch means a hazardous high wind event is possible.
Sustained wind speeds of at least 40 mph or gusts of 58 mph or
more are possible.

&&

$$

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
510 AM PST Sat Dec 15 2018

...Moderate to Strong Winds Expected Later Today into Sunday...

.A strong area of low pressure in the Gulf of Alaska will bring
increasing southerly winds later today into Sunday.

CAZ084-085-ORZ029>031-160000-
/O.NEW.KMFR.WI.Y.0034.181216T0600Z-181217T0600Z/
Northeast Siskiyou and Northwest Modoc Counties-Modoc County-
Klamath Basin-
Northern and Eastern Klamath County and Western Lake County-
Central and Eastern Lake County-
Including the cities of Newell, Lakeview, and Valley Falls
510 AM PST Sat Dec 15 2018

...WIND ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 10 PM PST
SUNDAY...

The National Weather Service in Medford has issued a Wind
Advisory...which is in effect from 10 PM this evening to 10 PM
PST Sunday.

* Winds...Southerly at 30 to 40 mph with gusts 45 to 55 mph,
  except locally higher in the mountains.

* Timing...Late this evening through late Sunday evening.

* Locations include...Areas in Klamath, Lake, and Modoc counties
  including Highway 97 at and near Modoc Point, portions of
  highways 140, 395, 299, 139, and 31. This includes Lakeview,
  Valley Falls, Paisley, and Alkali Lake.

* Impacts...Strong winds may make travel difficult, especially for
  high profile vehicles. Loose items may be blown about.

* View the hazard area in detail at
  https://www.wrh.noaa.gov/mfr/HAZARD

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Advisory means that winds of 35 mph are expected with
higher gusts possible. Use extra caution.

&&

$$


Winter Storm Watch


URGENT - WINTER WEATHER MESSAGE
National Weather Service Sacramento CA
251 AM PST Sat Dec 15 2018

...Heavy Mountain Snow Late Sunday Through Noon Monday...

.A winter storm will bring moderate to heavy snow to the
mountains of Western Plumas County and the Northern and Central
Sierra Nevada above 5500 feet late Sunday into late Monday
morning.

CAZ068-069-152000-
/O.CON.KSTO.WS.A.0014.181217T0000Z-181217T2000Z/
Western Plumas County/Lassen Park-
West Slope Northern Sierra Nevada-
251 AM PST Sat Dec 15 2018

...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON
THROUGH MONDAY MORNING ABOVE 5500 FEET...

* WHAT...Heavy snow possible. Plan on difficult travel conditions.
  Tree branches could fall as well. Total snow accumulations of 10
  to 18 inches, with localized amounts up to 24 inches, are
  possible.

* WHERE...Western Plumas County/Lassen Park and West Slope
  Northern Sierra Nevada, including Lassen National Park, Interstate
  80 over Donner Pass, Highway 50 over Echo Summit and Highway 88
  over Carson Pass.

* WHEN...From Sunday afternoon through Monday morning.

* ADDITIONAL DETAILS...Significant reductions in visibility are
  possible at times. Plan on travel delays with chain controls.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is potential for significant
snow, sleet or ice accumulations that may impact travel. Continue
to monitor the latest forecasts.

$$


High Wind Watch


URGENT - WEATHER MESSAGE
National Weather Service Medford OR
510 AM PST Sat Dec 15 2018

...Moderate to Strong Winds Expected Later Today into Sunday...

.A strong area of low pressure in the Gulf of Alaska will bring
increasing southerly winds later today into Sunday.

CAZ081-160000-
/O.NEW.KMFR.WI.Y.0034.181216T0000Z-181217T0600Z/
/O.NEW.KMFR.HW.A.0013.181216T1200Z-181217T0000Z/
Central Siskiyou County-
Including the city of Weed
510 AM PST Sat Dec 15 2018

...WIND ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO 10 PM PST
SUNDAY...
...HIGH WIND WATCH IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
AFTERNOON...

The National Weather Service in Medford has issued a Wind
Advisory...which is in effect from 4 PM this afternoon to 10 PM
PST Sunday. A High Wind Watch has also been issued. This High
Wind Watch is in effect from late tonight through Sunday
afternoon.

* Winds...South 35 to 40 mph with gusts 45 to 55 mph. Stronger
  winds gusting 60 to 70 mph are possible Sunday.

* Timing...Late this afternoon through late Sunday evening. The
  High Wind Watch is for Sunday.

* Locations include...Most of the Shasta Valley from the town of
  Weed north to the Klamath River, including Interstate 5 and the
  portion of Highway 97 near Weed. The High Wind Watch is for the
  weed area north to between Grenada and Gazelle.

* Impacts...Strong winds may make travel difficult, especially for
  high profile vehicles. Loose items may be blown about. Property
  and tree damage is possible in the warning area.

* View the hazard area in detail at
  https://www.wrh.noaa.gov/mfr/HAZARD

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Advisory means that winds of 35 mph are expected with
higher gusts possible. Winds this strong can make driving
difficult, especially for high profile vehicles. Use extra
caution.

A High Wind Watch means a hazardous high wind event is possible.
Sustained wind speeds of at least 40 mph or gusts of 58 mph or
more are possible.

&&

$$

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE