A strong wave associated with the storm that slowly moved inland spread more heavy snow across parts of Eastern Oregon and the West Central Mountains and Boise Mountains of Idaho.
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The episode as NWS BOI wrote it up.
A strong wave associated with the storm that slowly moved inland spread more heavy snow across parts of Eastern Oregon and the West Central Mountains and Boise Mountains of Idaho.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Boise, ID wrote its last area forecast discussion before the first event at Feb 9, 9:10 PM MST, 50 minutes earlier.
Area Forecast Discussion
National Weather Service Boise ID
910 PM MST Sat Feb 9 2019
.DISCUSSION...Deep closed low along the Oregon coast this evening
will turn eastward overnight, reaching eastern Oregon by sunrise.
Widespread showers will continue out ahead of the low center
overnight. Given the convective nature of the precipitation,
accumulations in the lower valleys will be localized and brief,
with amounts of less than an inch. East-central Oregon and the
west-central Idaho mountains and Boise mountains will see
accumulating snow into Sunday morning before precipitation tapers
off. Precipitation dissipates across Harney and Malheur counties
overnight as a dry slot wraps around the approaching low center.
No updates to the current forecast for tonight.
In regards to the current suite of hazard products: Winter
Weather Advisories and Winter Storm Warnings remain posted for
this current storm through early Sunday morning. There is also a
Winter Storm Watch and a separate set of Winter Weather
Advisories for a separate storm that moves into the region Sunday
night and continues through Tuesday.
&&
.AVIATION...Generally MVFR/IFR with areas of LIFR conditions due
to snow showers. Mountain obscurations. Snow showers move into
the mountains by Sunday afternoon with a few lingering showers for
lower valleys. Another round of showers moves in late Sunday night
hitting our northern zones. Surface winds, southerly 10-15kts
with gusts 20- 25kts in showers and higher elevations. Winds aloft
to 10k feet MSL, southwest 40-50kts becoming west- northwest by
Sunday afternoon 25- 30kts.
&&
.PREV DISCUSSION...
SHORT TERM...Tonight through Monday...Current storm will end
late tonight in eastern Oregon, and Sunday morning in western
Idaho, after dropping 6 to 12 inches total snow in Baker County
and Idaho north of the Snake Basin. Areas farther south had
much less snow, although Nampa through Eagle, ID, did report
2 to 3 inches overnight and this morning.
We continue to forecast a slight chance of thunderstorms in
eastern Oregon and southwestern-most Idaho through early this
evening.
Attention then turns to the next winter storm in the north
Pacific currently beginning to form in the western Aleutians.
That storm will head southeast across the north Pacific Sunday,
and will be off the WA/OR coast Monday. The storm is expected
to circulate much more moisture into our area than the current
storm, and models are already estimating 1 to 2 feet of new snow
for Idaho mountains north of the Snake Basin Sunday night through
Tuesday. We therefore have issued a new Winter Storm Watch there,
as well as for Baker County, for Sunday night through Tuesday.
Snow is expected as far south as the Snake Basin adjacent to the
foothills to the north, where up to 3 inches are expected. The
timing of this snow is late Sunday night through Monday morning,
which means that it will include the morning commuting period.
It should also be cold enough for snow to accumulate on the roads,
and a new winter weather advisory has been issued for it.
LONG TERM...Monday night through Thursday...
Models all in good consensus by indicating that the frontal system
that drops into the PacNW coast will pivot off the coast. This lifts
a warm front into the west central mountains Monday night through
Tuesday. The cold front will slide into eastern Oregon Tuesday
morning and then remain nearly stationary through the day. This
would tend to bring drier and warmer conditions (closer to normal)
to the lower elevations of southwest Idaho. Heavy snow will continue
across Idaho's west central mountains where an additional 6 to 12
inches of snow are possible Monday night through Tuesday. The cold
front will finally slide into southwest Idaho Wednesday and into
eastern Idaho Thursday morning as models all build a brief upper
ridge into the PacNW.
Thursday night through Saturday...Partly cloudy skies are expected
across the region as a dirty shortwave ridge temporarily dominates
the weather. Northern sections will see a chance of snow showers
as Moisture spills into those areas ahead of the next trough. With
persistent cold air in place, snow is expected to fall throughout
the entire time period. By Friday night, snow showers should
increase and spread eastward as a large batch of moist, unsettled
air gets ushered in in advance of an upper level shortwave trough.
Heavier snow amounts are expected in the mountains. Little change
is expected throughout the remainder of the period as the trough
moves across the region. High and low temperature are expected to
measure in around 6 to 8 degrees below normal.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Winter Weather Advisory from 5 PM Sunday to 5 PM MST Monday
IDZ014>016-029.
Winter Storm Warning until 11 AM MST Sunday IDZ011-013-028-033.
Winter Weather Advisory until 11 AM MST Sunday IDZ015-029.
Winter Storm Watch from Sunday afternoon through Tuesday
afternoon IDZ011-013-028-033.
OR...Winter Weather Advisory from 5 PM MST /4 PM PST/ Sunday to 5 PM
MST /4 PM PST/ Monday ORZ063.
Winter Storm Warning until 10 AM PST Sunday ORZ062.
Winter Storm Watch from Sunday afternoon through Tuesday
afternoon ORZ062.
Winter Weather Advisory until 5 AM MST /4 AM PST/ Sunday ORZ063.
Winter Weather Advisory until 10 PM PST this evening ORZ061.
&&
www.weather.gov/Boise
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DISCUSSION...DG
AVIATION.....JC
PREV SHORT TERM...LC
PREV LONG TERM....CR/WHThe national radar mosaic for the moment the first event began.
1 heavy snow. Local standard time, as filed.
The COOP observer in Halfway reported 11 inches of new snow with several areas reporting 6 to 10 inches.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2019Every state in 2019This day in weather historyWarnings in Oregon, February 2019
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 810575.