Suppression Forecast
Issued by NWS Spokane, WA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
000
FNUS76 KOTX 202041
FWSOTX

Spot Forecast for Jack Creek Fire...USFS
National Weather Service Spokane WA
141 PM PDT Sun Aug 20 2017

Forecast is based on request time of 0600 PDT on August 21.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...

...Solar eclipse 0909-1141 PDT Monday...
...Strong cold front to pass through fire early Thursday...

A weak disturbance is moving through today providing high clouds
over the fire. The clouds will dissipate through the evening hours.
Just some very high cirrus is expected during the eclipse Monday.
92% obscuration of the sun is expected over the fire, which
will produce light and variable winds and cause the mixing heights
rise slower than what has been seen previous days.

An upper level ridge will build over the fire Monday and Tuesday.
This will produce warmer temps and lower daytime RH values.
Overnight RH values will be fair.

Wednesday there will be some cooling as the ridge slips east ahead
of the trough and associated cold front gearing up to move in.

Thursday`s cold front will be dry. Not expecting any precipitation
associated with it for your fire. Westerly winds will start to
increase Wednesday night at around 10 mph. They will increase Thur
morning to around 15 mph and then even further in the afternoon.
Given the location the fire plots at, unless the fire is along the
ridgeline, would expect you to be protected from the strongest winds.
However any fire along exposed areas or ridgelines will see very
gusty winds Thursday.

Any comments on how the westerly winds impacted your fire over
the last week would be helpful in forecasting for the upcoming cold
front.



.MONDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
LAL.................1.
Max temperature.....76.
Min humidity........30 percent.
Wind (20 ft)........Upslope 2 to 5 mph, except variable winds during
                    the eclipse.
Mixing height.......Near surface in the morning, slow to rise during
                    the morning hours...becoming 4500 ft AGL in the
                    afternoon.
Transport winds.....Southeast 1 to 5 mph.
Haines Index........2 very low.

.MONDAY NIGHT...

Sky/weather.........Mostly clear.
CWR.................0 percent.
LAL.................1.
Min temperature.....56.
Max humidity........60 percent.
Wind (20 ft)........Variable 2 to 5 mph.
Mixing height.......Near surface.
Transport winds.....Southeast 1 to 5 mph.
Haines Index........3 very low.

.TUESDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
LAL.................1.
Max temperature.....80.
Min humidity........26 percent.
Wind (20 ft)........Variable 2 to 5 mph.
Mixing height.......600 ft AGL in the morning increasing to 5800 ft
                    AGL in the afternoon.
Transport winds.....South 4 to 8 mph.
Haines Index........3 very low.

$$
Forecaster...LN
Requested by...Toby Stapleton
Type of request...WILDFIRE
.TAG 1714476.2/OTX



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.