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Area forecast discussion 
National Weather Service Spokane Washington
456 am PST Wednesday Mar 4 2015

Synopsis...
mild high pressure will build over the inland northwest the next
few days bringing a prolonged period of dry weather.
Precipitation is not expected until Tuesday or Wednesday next
week. A warming trend is expected over the next few days. By
Friday, most areas will be about 10 degrees above average, and the
mild weather is expected to carry into early next week.



&&

Discussion...

Today through friday: split flow over North America will keep the
inland northwest high and dry through early next week. The
northern branch of the polar jet will remain well north of the
British Columbia border through the weekend. Today into Thursday,
a large 500mb high will spread on-shore leading to a moderation of
our resident chilly air mass. Look for temperatures to be 3 to 5
degrees warmer today than yesterday. The warming trend will
continue Thursday and Friday. By Friday, we are looking for
afternoon temperatures to be in the mid 50s to near 60 which is
10 degrees above average. A weak upper level disturbance will
over-top the ridge Thursday into Friday bringing an increase in
mid and high level clouds. The low level air mass will likely be
too dry for rain or snow, so precipitation chances have been
decreased to 20 percent or less, even in the mountainous zones.
/Gkoch

Friday night through wednesday: the upper level ridge will
continue to dictate the weather across the inland northwest with
mainly dry and mild conditions. With the ridge axis aloft anchored
off the coast, the flow aloft will be out of the northwest with
minor disturbances brushing along our northern border. Each
disturbance will provide an increase of cloud cover and possible
mountain sprinkles through the weekend. By early next week, the
GFS and European model (ecmwf) show subtle difference that weakens the confidence
for later portion of the forecast. The European model (ecmwf) wants to hold onto
the strong ridge while Pacific energy and moisture pools in the
eastern Pacific. This would keep the weather continued mild and
mostly dry. The GFS shows a more progressive pattern that flattens
the ridge and brings energy down from the Gulf of Alaska. The GFS
would bring more unsettled weather by Tuesday and into Wednesday.
Opted to follow the current slower trends depicted by the European model (ecmwf)
and keep a drier forecast through early next week. Temperatures
will warm each day and remain above normal for early next week.
/Rfox.

&&

Aviation...
12z tafs: clear skies and light winds will be the prevailing
condition at the taf sites in eastern Washington and north Idaho
today and tonight. Strong upper level high pressure currently
off-shore will spread into the inland northwest during the next 24
hours bringing the clear and placid conditions. /Gkoch

&&

Preliminary point temps/pops...
Spokane 44 23 49 30 54 33 / 0 0 0 0 0 0
Coeur D'Alene 44 21 49 28 54 30 / 0 0 0 0 0 0
Pullman 44 26 52 29 56 34 / 0 0 0 0 0 0
Lewiston 49 27 56 33 58 36 / 0 0 0 0 0 0
Colville 46 21 52 28 55 30 / 0 0 0 0 0 0
Sandpoint 41 20 45 26 49 28 / 0 0 0 0 10 0
Kellogg 41 25 46 31 50 31 / 0 0 0 0 10 10
Moses Lake 51 22 54 29 59 34 / 0 0 0 0 0 0
Wenatchee 50 29 53 36 58 38 / 0 0 0 0 0 0
Omak 48 23 53 30 56 33 / 0 0 0 0 0 0

&&

Otx watches/warnings/advisories...
Idaho...none.
Washington...none.
&&

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