Suppression Forecast
Issued by NWS Eureka, CA

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000
FNUS76 KEKA 180304
FWSEKA

Spot Forecast for SHF-1770 Helena Fire...USFS
National Weather Service Eureka CA
804 PM PDT Tue Oct 17 2017

If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office at (707) 443-6484, if you have questions
or concerns with this forecast.

.DISCUSSION...Warm and dry conditions will continue during the day
Wednesday, with a continuation of mostly light and terrain-driven
winds.

Overnight Wednesday, southwesterly winds will gradually
begin to increase in higher elevations as a cold front approaches
the region. Southwest winds will continue to increase through the
day Thursday, reaching peak speeds during the late afternoon.
These winds will primarily impact the higher elevations,
especially southwest-facing slopes. Meanwhile, winds in the narrow
and protected valleys of the region will likely be erratic but
much lighter overall.

Fortunately, rain is expected to begin falling by early to mid
afternoon Thursday as wind speeds reach their maximum, and a light
wetting rain is expected Thursday afternoon and evening. Rainfall
totals of between .15 inches in low elevations to near .75 inches
in the high elevations can be expected by Friday morning.

.WEDNESDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
LAL.................1.
Max temperature.....Valleys: 76 to 81.

                    Mid Slopes and ridges: 68 to 75

Min humidity........20 to 28 percent.
Wind (20 ft)........Downslope 2 to 5 mph in the morning...becoming
                    southwest/upslope 4 to 7 mph with gusts to 12 mph
                    in the afternoon.
Mixing height.......300 ft AGL increasing to 2800 ft AGL by mid
                    afternoon.
Transport winds.....West around 7 mph.

.WEDNESDAY NIGHT...

Sky/weather.........Mostly clear.
CWR.................0 percent.
LAL.................1.
Min temperature.....42 to 50. Coolest temperatures in valleys and
                    on taller ridges.
Max humidity........Valleys: 80 to 90 percent
                    Mid Slopes and Ridges: 60 to 80 percent.
Wind (20 ft)........Valleys: Variable/downslope 2 to 5 mph.
                    Mid Slopes and Ridges: Becoming Southwest 8 to 15
                    mph after midnight. Gusts to 20 mph on taller
                    peaks with South and Southwest exposure.
Mixing height.......600 ft AGL.
Transport winds.....Southwest around 15 mph.

.THURSDAY...

Sky/weather.........Partly cloudy then becoming cloudy. Rain in the
                    afternoon and evening.
CWR.................80 percent.
LAL.................1.
Max temperature.....Valleys: 60 to 65
                    Mid Slopes: 55 to 60
                    Ridges: 48 to 55.
Min humidity........40 to 60 percent.
Wind (20 ft)........Valleys:  Variable 6 to 10 mph, occasional gusts
                    to 15 mph.
                    Mid Slopes and Ridges: Southwest 10 to 20 mph,
                    increasing to Southwest 15 to 25 mph by mid
                    afternoon. Gusts to 35 mph and occasionally higher
                    will be possible late afternoon on taller peaks
                    and ridges with southwest exposure.
Mixing height.......1500 ft AGL.
Transport winds.....Southwest around 25 mph.

$$
Forecaster...Charboneau
Requested by...Dave Nelson
Type of request...WILDFIRE
.TAG 1717096.7/EKA
.EMAIL dcnelson02@fs.fed.us



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