A warm front moved through the area bringing snow and rain to the valleys and higher snow accumulations in the mountains.
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The episode as NWS BOI wrote it up.
A warm front moved through the area bringing snow and rain to the valleys and higher snow accumulations in the mountains.
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 Jan 4, 2:42 PM MST, 4 hours 18 minutes earlier.
Area Forecast Discussion
National Weather Service Boise ID
242 PM MST Tue Jan 4 2022
.SHORT TERM...Tonight through Thursday night...A stationary front
laying across the southern portion of the area will move back
north and then stall over the northern portion of the area tonight
before sliding back a little south tomorrow. This will bring
higher snow levels to the southwestern third and central of the
area tonight, then lower them back down across the central part of
the area tomorrow (it won't get far enough south to lower them
again over the southwestern third of the area). This will result
in snow changing to rain and then back to snow for folks mainly in
the central part of the CWA - notably much of the Treasure Valley.
Snowfall will be significant enough for another round of winter
weather warnings and advisories (see below). For much of the
Treasure Valley, snow this afternoon will change to rain late this
evening, then back to light snow Wednesday late morning.
Believe it or not, this more or less stationary front will move
back north late Wednesday night and Thursday morning, changing the
snow back to rain over the central part of the CWA, and even in
some parts of the mountains (below around 5500 feet in the
southern part of the Boise Mountains such as Idaho City and below
around 4500 feet in the northern part of the West Central
Mountains). Additional advisories or warnings will probably be
needed there Wednesday night and Thursday. Oddly enough, the
timing of the front will mean mostly snow in the Treasure Valley
during the days and mostly rain at night. Temperatures will show
fairly small diurnal ranges tonight through Wednesday night,
before warming up above normal Thursday (lower to mid 40s over
most of the western Magic and Treasure Valleys, as well as the
Baker Valley). Most of southeast Oregon will also see lower to mid
40s Thursday, with the far southern part of both Harney and
Malheur counties getting there on Wednesday. Snowfall totals in
the lower elevations will not be significant (with the exception
of the northern part of the western Magic Valley, 2 to 4 inches
are possible by the end of Wednesday, and where a winter weather
advisory has been extended). By late Thursday night, another push
of moisture will bring heavy snow to the mountains, and yet
another winter weather warning or advisory may be needed.
.LONG TERM...Friday through Tuesday...The last low pressure trough
of the current series will cross our area Friday and Friday night.
Snow levels are forecast to be around 4500 feet on Friday, lowering
to around 3500 feet by Saturday morning. Only light precipitation is
expected at lower elevations, with a few inches of snow in the
mountains. Models show precipitation ending on Saturday as the
system moves east of the Rockies and a high pressure ridge begins to
build in from the west. The ridge will keep our area dry through
Monday night. On Tuesday a weak disturbance will bring a slight
chance of snow to our northern zones and increasing clouds in
southern areas. Temperatures will average around 10 degrees above
normal on Friday, around 5 degrees above normal on Saturday, and
around 5 degrees below normal Sunday through Tuesday as a
temperature inversion develops beneath the high pressure ridge.
&&
.AVIATION...Widespread precipitation will bring mountain obscuration
and areas of MVFR/IFR conditions tonight through Wednesday. Expect a
mix of rain and snow in the lower valleys and moderate to heavy snow
above 4k feet MSL. Low level wind shear possible tonight. Surface
winds: tonight...mainly southeast 5-15 kts except 10-20 kts gusting
to around 30 kts in the Magic Valley and south of the Snake River
Valley. Wednesday...west to northwest 10-20 kts except 15-25 kts
gusting to around 35 kts in the Magic Valley and south of the Snake
River valley. Winds aloft at 10k feet MSL west-northwest 40-60
kts.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Winter Storm Warning until 5 AM MST Wednesday IDZ033.
Winter Storm Warning until 5 AM MST Wednesday IDZ015-029-030.
Winter Weather Advisory until 11 AM MST Wednesday IDZ011-013-028.
Winter Weather Advisory until 5 AM MST Wednesday IDZ016.
OR...Winter Weather Advisory until 10 AM PST Wednesday ORZ062.
&&
www.weather.gov/Boise
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SHORT TERM...SP
LONG TERM....JT
AVIATION.....JTThe national radar mosaic for the moment the first event began.
1 heavy snow. Local standard time, as filed.
The SNOTEL at Wolf Creek measured 8.0 inches of snow at 5,630 feet.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2022Every state in 2022This day in weather historyWarnings in Oregon, January 2022
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: 997926.