Idaho, 2017

Avalanche in Idaho, February 9, 2017

February 9, 2017 · NWS PIH · 1 event in 1 county or zone

A snowmobiler was killed in an avalanche near McCoy Creek. The location was in extreme eastern Bonneville County right on the Wyoming border.

The toll

Deaths
1
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS PIH wrote it up.

A snowmobiler was killed in an avalanche near McCoy Creek. The location was in extreme eastern Bonneville County right on the Wyoming border. He was buried under 3 feet of snow and died from injuries sustained in the avalanche.

What forecasters said that day

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 Pocatello, ID wrote its last area forecast discussion before the first event at Feb 9, 10:43 AM MST, 2 hours 17 minutes earlier.

Area forecast discussion, Feb 9, 10:43 AM MST, 2 hours 17 minutes before
Area Forecast Discussion
National Weather Service Pocatello ID
1043 AM MST Thu Feb 9 2017

.UPDATE...Model updates this morning were primarily focused on
adjusting forecast liquid precipitation amounts for the next 24
hours. Looking at trends last night and the 12Z model runs this
morning, the adjustments resulted in roughly a 20-30 percent
reduction, depending on location, over the previous forecast. A
good deal of the snow melt we have experienced lately is from
temperatures. Both temperature and new rainfall on existing snow
are important considerations when estimating how much water makes
it into local rivers. RS

&&

.PREV DISCUSSION... /issued 235 AM MST Thu Feb 9 2017/

SHORT TERM...Today through Saturday. Another storm system moving
into the Pac NW today will continue to spread rain and high
elevation snow across the area through tonight. Snow levels will
be pushing 8000 ft today...lowering tonight to around 7000 ft. The
heaviest snow is expected in the central mtns where an additional
6 to 12 inches is possible thru tonight. The upper Snake
Highlands may see an additional 3 to 6 inches above 7000 ft. The
main area of precip shifts to the southeast highlands on
Fri...while coverage and amounts decrease elsewhere. By Sat...most
of the precip is in the eastern highlands with fairly light
amounts. Temps will be a few degrees cooler Fri and Sat...but warm
enough to continue melting the low elevation snowpack. Hedges

LONG TERM...Sunday through Thursday...High pressure will be in
control of the weather pattern the latter half of the weekend and
going into early next week. This will allow for clear skies but
foggy mornings. Chilly temperatures are expected on Sunday as
northerly flow spills into the northern half of our region. Eastern
Magic Valley and the Southern Snake Plain areas are expected to
remain at near normal temperatures. Warmer conditions are expected
for all Monday and Tuesday with a further increasing temperature
trend Wednesday. Temperatures are then likely to settle as the next
weather system approaches from the west on Thursday with increasing
cloud cover and a chance for rain and snow showers is forecast.
NP/Hedges

AVIATION...Wind shear will be a concern at KSUN throughout the
day. Expect shear in the 30 to 35 kt range but it will not be
impossible for higher amounts of shear to be reached. MVFR ceilings
are forecast to drop to IFR this morning and remain down through
this evening. For KBYI, ceilings will be VFR but it may rain. Even
though we are not forecasting thunderstorms in this region in
particular, there is a slightly elevated concern here for downburst
potential should any convective activity develop nearby. Sounding
data is too favorable to ignore in the late morning to early
afternoon hours of this potential. Ceilings at KDIJ, KIDA and KPIH
are forecast to vary between IFR and MVFR today due to precipitation
activity once again. Winds are expected to be gusty this afternoon
to 30 kts. NP/Hedges

HYDROLOGY...Rain across the area today and tonight...combined
with warm temps will result in more snowmelt and continuing
flooding problems at lower elevations. Precip is expected to
diminish on Fri...but continued warm temps will prolong the
flooding threat for at least a few more days.
Hedges

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory until 5 PM MST this afternoon for IDZ019-
023.

Winter Storm Warning until 5 AM MST Friday for IDZ018-031.

&&

In the hours before

Local storm report, Feb 9, 8:32 AM MST, 4 hours 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
832 AM MST THU FEB 09 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 AM     FLOOD            6 SSE GRACE             42.50N 111.68W
02/09/2017                   CARIBOU            ID   TRAINED SPOTTER

            IN THE TOWN OF THATCHER, FIELDS ALONG THE RIVER BOTTOMS
            HAVE STANDING WATER FROM SNOW MELT AND RAIN. TRAINED
            SPOTTER MEASURED 0.45 INCHS OF RAIN THE PAST 24 HOURS.

&&

RSURVICK
Local storm report, Feb 9, 11:21 AM MST, 1 hour 39 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
1121 AM MST THU FEB 09 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1050 AM     FLOOD            2 NE RUPERT             42.64N 113.65W
02/09/2017                   MINIDOKA           ID   LAW ENFORCEMENT

            HIGHWAY 24 STILL CLOSED NORTHEAST OF RUPERT. 10 INCHES OF
            WATER OVER ROAD. FLOODING GETTING WORSE ACROSS MINIDOKA
            COUNTY. NUMEROUS ROAD CLOSURES DUE TO WATER OVER THEM. A
            COUPLE OF VEHICLES HAVE BEEN FLOATED BY THE WATER.

&&

KB
Local storm report, Feb 9, 11:30 AM MST, 1 hour 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
1130 AM MST THU FEB 09 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1120 AM     FLOOD            10 SSE ROCKLAND         42.44N 112.80W
02/09/2017                   POWER              ID   NWS EMPLOYEE

            FLOODING AT INTERSECTION OF ROCKLAND HIGHWAY AND SIMMS
            ROAD. SOME EROSION OF SIMMS ROAD.

&&

KB
Local storm report, Feb 9, 11:47 AM MST, 1 hour 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
1147 AM MST THU FEB 09 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1115 AM     FLOOD            5 NE AMERICAN FALLS     42.83N 112.78W
02/09/2017                   POWER              ID   LAW ENFORCEMENT

            ENTRANCE/EXIT RAMPS TO INTERSTATE 86 AT MILE POST 44
            CLOSED DUE TO FLOODING.

&&

KB
Local storm report, Feb 9, 12:09 PM MST, 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
1209 PM MST THU FEB 09 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1150 AM     FLOOD            ALBION                  42.41N 113.58W
02/09/2017                   CASSIA             ID   LAW ENFORCEMENT

            WIDESPREAD FLOODING CONTINUES ACROSS CASSIA COUNTY. HOME
            FLOODED IN ALBION. TRAPPER CREEK ABOVE OAKLEY RESERVOIR
            WASHED OUT A ROAD...ISOLATING 2 HOMES. NUMEROUS COUNTY
            ROADS FLOODED.

&&

KB

Event by event

1 avalanche. Local standard time, as filed.

Avalanche, Caribou Highlands

When
February 9, 1:00 PM MST to 6:00 PM MST
Where
Caribou Highlands forecast zone
Deaths
1 direct, 0 indirect
Reported by
Newspaper

A snowmobiler was killed in an avalanche near McCoy Creek. The location was in extreme eastern Bonneville County right on the Wyoming border. He was buried under 3 feet of snow and died from injuries sustained in the avalanche.

The people who died

As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.

EventDateAgeSexWhereKind
Avalanche, Caribou Highlands2017-02-0935MaleOutside/Open AreasDirect

What these are

Avalanche
A mass of snow sliding down a mountainside that caused a death, an injury or damage.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Idaho in 2017Every state in 2017This day in weather historyWarnings in Idaho, February 2017

Sources

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: 681117.