Special Weather Statement, NWS Eureka, CA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
238 PM PST Sun Mar 5 2017

.SYNOPSIS...A cold upper disturbance will exit east away from the
region tonight through Monday, but will be followed by additional
wet weather systems Tuesday through Saturday.

&&

.DISCUSSION...An upper trough, with 500 mb temperature around -36
C, will gradually move east away from the region tonight through
Monday. This will cause lapse rates and upward vertical motion to
weaken with time. Thus, expect shower intensity to slowly
diminish, brining an end to the thunderstorm and accumulating hail
threat. However, cold air aloft will be sufficient for
accumulating snowfall above 1000-2000 feet...thus maintained the
winter storm warning and winter weather advisory through late
Monday morning.

After Monday...quasi-zonal flow is forecast to persist through
late week. This will maintain moist onshore flow, with
precipitation chances being augmented by the passage of individual
small-scale waves. One wave is forecast to reach NWRN CA during
Tuesday, a second during Thursday, and a third on Saturday.

&&

.AVIATION...A cold, unstable air mass produced showers, hail and
gusty winds across Northwest California today...especially at CEC,
ACV and most of the coastal locations. Visible Satellite Imagery
at 1:40 pm still showed plenty of unstable showers persisting over
the North Coast's inner/outer waters. The continual stream of
convective activity has been somewhat enhanced by a couple of
upper level disturbances moving through the region. Frequent MVFR
conditions have also been widespread today...resulting in some
possible flight hazards and restrictions. Guidance indicates
conditions to continue overnight and Monday, although showers may
start to diminish a little by Monday afternoon.

&&

.MARINE...Low pressure over the northeastern Pacific is forecast
to move inland and dissipate tonight. This will aid in a slight
weakening of northwesterly winds, though occasional gusts from
20-30 kt remain probable during the next 24 hours. In addition,
steep seas from 10-13 feet will persist through Monday. Thus,
ongoing small craft advisory has been extended until Monday
evening. A second surface low is forecast to move east across the
NERN Pacific late Monday night through Tuesday afternoon. This
will aid in a possible period of gale force southerlies. Winds
will then weaken significantly by Wednesday.

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...Winter Storm Warning until 10 AM PST Monday for CAZ102-104>108-
     110-111.

     Winter Weather Advisory until 10 AM PST Monday for CAZ112-113.

NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory until
     10 PM PST Monday for PZZ450-455-470- 475.

&&

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Hazardous Weather Outlook
National Weather Service Eureka CA
655 PM PST Sun Mar 5 2017

CAZ101-103-070300-
Coastal Del Norte-Northern Humboldt Coast-
655 PM PST Sun Mar 5 2017

This hazardous weather outlook is for northwest California.

.DAY ONE...Tonight.

Small hail is possible this evening, with the threat diminishing
greatly overnight.

Occasional bursts of snow will also be possible to as low as 500 to
1000 feet this evening and overnight, but is not likely to
accumulate at these elevations.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

No hazardous weather is expected.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

For further details please refer to NOAA Weather Radio or
weather.gov/eureka.

CAZ102-104>108-070300-
Del Norte Interior-Southwestern Humboldt-Northern Humboldt Interior-
Southern Humboldt Interior-Northern Trinity-Southern Trinity-
655 PM PST Sun Mar 5 2017

...WINTER STORM WARNING IN EFFECT UNTIL 10 AM PST MONDAY...

This hazardous weather outlook is for northwest California.

.DAY ONE...Tonight.

Several inches of snow can be expected at elevations above 1500 feet
tonight. Snow will be highly variable and periodic as waves of
showers move in and out of the region. Snowfall accumulations of 2 to
6 inches are expected for elevations from 2000 to 5000 feet, while 7
to 10 inches are expected above 5000 feet.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Showers will continue through late Monday, with gradually rising
snow levels and diminishing coverage through the day and overnight.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

For further details please refer to NOAA Weather Radio or
weather.gov/eureka.

CAZ110-111-070300-
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
655 PM PST Sun Mar 5 2017

...WINTER STORM WARNING IN EFFECT UNTIL 10 AM PST MONDAY...

This hazardous weather outlook is for northwest California.

.DAY ONE...Tonight.

Light to moderate snow can be expected at elevations above 1000 feet
tonight. Snow will be highly variable and periodic as waves of
showers move in and out of the region. Snowfall accumulations of 2 to
5 inches are expected for elevations above 1000 feet.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Showers will continue through late Monday, with gradually rising
snow levels and diminishing coverage through the day and overnight.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

For further details please refer to NOAA Weather Radio or
weather.gov/eureka.

CAZ112-113-070300-
Southwestern Mendocino Interior-Southeastern Mendocino Interior-
655 PM PST Sun Mar 5 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 10 AM PST MONDAY...

This hazardous weather outlook is for northwest California.

.DAY ONE...Tonight.

Small hail is possible this evening. Hail accumulating on roadways
may result in potentially hazardous driving conditions.

In addition, bursts of snow can be expected at elevations primarily
above 1500 feet tonight, with 2 to 5 inches of storm total
accumulation possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Light snow can be expected through at least early Monday, with
rising snow levels and diminishing shower coverage and intensity
during the remainder of the day.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

For further details please refer to NOAA Weather Radio or
weather.gov/eureka.

CAZ109-070300-
Mendocino Coast-
655 PM PST Sun Mar 5 2017

This hazardous weather outlook is for northwest California.

.DAY ONE...Tonight.

Small hail is possible this evening. Hail accumulating on roadways
may result in potentially hazardous driving conditions.

In addition, bursts of snow can be expected at elevations primarily
above 1500 feet tonight, with light accumulations possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Light snow can be expected through at least early Monday, with
rising snow levels and diminishing shower coverage and intensity
occurring during the remainder of the day.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

For further details please refer to NOAA Weather Radio or
weather.gov/eureka.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EUREKA CA
459 PM PST SUN MAR 5 2017

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

0445 PM     SNOW             5 N RUTH                40.35N 123.41W
03/05/2017  E12.0 INCH       TRINITY            CA   PUBLIC

            INTERNET SUBMITTED STORM TOTAL SNOWFALL OF
            12". LOCATION WAS RUTH LAKE HOWEVER EXACT
            LOCATION ESTIMATED.

&&

WI

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EUREKA CA
655 PM PST SUN MAR 5 2017

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

0652 PM     SNOW             1 NNW BIG BAR           40.74N 123.25W
03/05/2017  E0.3 INCH        TRINITY            CA   TRAINED SPOTTER

            SNOWFALL BEGAN TO STICK AROUND 4PM AT AN
            ELEVATION OF 1000 FEET.

&&

WI

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EUREKA CA
852 PM PST SUN MAR 5 2017

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

0848 PM     SNOW             1 ENE BRIDGEVILLE       40.47N 123.79W
03/05/2017  E6.0 INCH        HUMBOLDT           CA   TRAINED SPOTTER

            ELEVATION OF 2800 FEET. SNOW IS CURRENTLY
            FALLING WITH 6" TOTAL ON THE GROUND. .

&&

WI

Special Weather Statement
National Weather Service Eureka CA
852 PM PST SUN MAR 5 2017

CAZ103-106-060515-
Northern Humboldt Coast CA-Southern Humboldt Interior CA-
852 PM PST SUN MAR 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL HUMBOLDT COUNTY
UNTIL 915 PM PST...

At 852 PM PST, Doppler radar was tracking a strong thunderstorm 8
miles northwest of Fortuna, or 12 miles southwest of Eureka, moving
northeast at 35 mph.

Half inch hail will be possible with this storm.

This strong thunderstorm will be near...
  Fortuna around 900 PM PST.
  Eureka around 915 PM PST.

Other locations impacted by this storm include Myrtletown, Cutten,
Loleta, Humboldt Hill, Ferndale, Pine Hills, Bayview and Fernbridge.

LAT...LON 4055 12436 4066 12430 4073 12425 4082 12407
      4059 12408
TIME...MOT...LOC 0452Z 239DEG 30KT 4065 12431

GARNER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EUREKA CA
906 PM PST SUN MAR 5 2017

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

0904 PM     SNOW             3 ENE WESTHAVEN-MOONSTO 41.05N 124.05W
03/05/2017  M0.5 INCH        HUMBOLDT           CA   TRAINED SPOTTER

            ELEVATION 800 FEET. HALF AN INCH OF SNOW HAS
            FALLEN IN THE LAST 30 MINUTES. .

&&

WI

Special Weather Statement
National Weather Service Eureka CA
907 PM PST SUN MAR 5 2017

CAZ103-106-060600-
Northern Humboldt Coast CA-Southern Humboldt Interior CA-
907 PM PST SUN MAR 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL HUMBOLDT COUNTY
UNTIL 1000 PM PST...

At 907 PM PST, Doppler radar was tracking a strong thunderstorm near
Fortuna, or 7 miles south of Eureka, moving east at 30 mph.

Half inch hail will be possible with this storm.

This strong thunderstorm will be near...
  Eureka around 920 PM PST.

Other locations impacted by this storm include Myrtletown, Cutten,
Fairhaven, Loleta, Humboldt Hill, Pine Hills, Freshwater, Bayview,
Samoa and Fernbridge.

LAT...LON 4060 12421 4065 12425 4076 12423 4090 12415
      4091 12407 4062 12399
TIME...MOT...LOC 0507Z 252DEG 26KT 4069 12417

GARNER