Winter Weather in Idaho, December 1, 2014

Name: Winter Weather in Idaho, December 1, 2014
Start: 2014-12-01T05:30
End: 2014-12-01T06:10
Location: Idaho

December 1, 2014 · NWS BOI · 1 event in 1 county or zone

A warm front moving through the Great Basin spread snow and pockets of freezing rain across parts of Southwest Idaho and Southeast Oregon making roads slick and hazardous. Numerous accidents were reported including 3 fatalities.

Where it happened

Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 2
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 BOI wrote it up.

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 Boise, ID wrote its last area forecast discussion before the first event at Dec 1, 4:02 AM MST, 1 hour 28 minutes earlier.

Area forecast discussion, Dec 1, 4:02 AM MST, 1 hour 28 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
402 AM MST MON DEC 1 2014

.SHORT TERM...TODAY THROUGH TUESDAY...THE WARM FRONT WE HAVE BEEN
DISCUSSING WILL FINALLY MOVE INTO THE AREA LATER TODAY. LIGHT SNOW
SHOWERS IN ADVANCE OF THIS FRONT HAVE BEEN OCCURRING ACROSS THE
WESTERN MAGIC VALLEY AND IN NEARBY AREAS. ADDITIONAL SHOWERS ARE
FORMING ACROSS SOUTHCENTRAL OREGON...AND THESE WILL BE MOVING AND
DEVELOPING NE INTO OUR SE OREGON ZONES DURING THE DAY. AS THE WARM
FRONT INTERACTS WITH THE MOUNTAINS...SNOW INTENSITY WILL INCREASE.
WE HAVE DECIDED TO ISSUE A WINTER WEATHER ADVISORY FOR SNOW FOR
ZONES 11 AND 33 FROM 18Z TODAY TO 06Z TONIGHT. AMOUNTS ARE
MARGINAL...BUT THE ROADS ARE VERY COLD AND THE SNOW WILL STICK AND
PACK IMMEDIATELY. TEMPS TODAY ARE QUITE TRICKY...ESPECIALLY IN THE
TREASURE VALLEY. COLD AIR IS EXPECTED TO BE SLOW TO ERODE IN THE
LOWER TREASURE...BUT EXACTLY HOW SLOW IS DIFFICULT TO DETERMINE.
WE HAVE ALLOWED ONTARIO TO WARM TO ABOVE FREEZING THIS AFTERNOON
IN OUR FORECAST...BUT THERE IS SOME DOUBT AS TO WHETHER OR NOT
THIS WILL HAPPEN. IF IT DOES NOT...THEN FREEZING RAIN IS POSSIBLE
IN THE LOWER TREASURE VALLEY...EXTENDING INTO SE BAKER COUNTY AND
ALSO NORTH INTO THE WEISER RIVER BASIN. THIS THREAT OF FREEZING
RAIN IS ALSO FOUND IN THESE SAME AREAS LATE TONIGHT AND EARLY
TUESDAY. FOR TODAY...DID NOT PUT THE MENTION OF FREEZING RAIN IN
THE FORECAST BECAUSE WE WARMED TEMPS ABOVE FREEZING...AND BECAUSE
WE EXPECT SNOW TO BE THE DOMINATE WEATHER TYPE. HOWEVER...THE
MENTION IS THERE TONIGHT AND EARLY TUESDAY. IN THE MOUNTAINS WHERE
THE ADVISORY HAS BEEN ISSUED..WE EXPECT AROUND 4 INCHES IN MCCALL
AND UP TO A FOOT IN HIGHER ELEVATIONS. IN THE UPPER WEISER RIVER
BASIN...WE EXPECT 1 TO 3 INCHES. BY TUESDAY...THE WARM FRONT WILL
BE ALONG THE NORTHERN PORTION OF THE AREA...AND PRECIP WILL
CONTINUE MAINLY IN THE MOUNTAINS. INTENSITY WILL DECREASE NOTABLE
IN THE AFTERNOON. AT THIS TIME...A NEW SYSTEM WILL BE APPROACHING
FROM THE SOUTHWEST...BUT IT WILL NOT YET IMPACT THE AREA. TEMPS
TUESDAY WILL BE AROUND 5 DEGREES WARMER THAN TODAY.

.LONG TERM...TUESDAY NIGHT THROUGH SUNDAY...NO SIGNIFICANT CHANGES
IN THE EXTENDED PERIOD AS SPLIT FLOW WILL RESULT IN WEAKENED STORM
SYSTEMS OVER THE INTERMOUNTAIN REGION AFTER WEDNESDAY. A SYSTEM
WILL BRING WIDESPREAD PRECIPITATION TO THE AREA WEDNESDAY INTO
THURSDAY WITH THE PASSAGE OF WHAT REMAINS OF THE UPPER TROUGH.
SNOW LEVELS INCREASE TO 6000 FEET WEDNESDAY. CHANCES FOR
PRECIPITATION DIMINISH FRIDAY THROUGH THE WEEKEND AS AN UPPER
RIDGE AMPLIFIES OVER THE REGION...AHEAD OF ANOTHER SYSTEM
APPROACHING THE COAST. THE FORECAST MODELS CONTINUE TO SHOW THIS
SYSTEM SPLITTING AS IT MOVES THROUGH THE PAC NW THIS WEEKEND.
TEMPERATURES THROUGH THE PERIOD WILL BE ABOUT 5 DEGREES ABOVE
NORMAL.

&&

.AVIATION...LOW VFR-MVFR CEILINGS THIS MORNING. SCATTERED SNOW
SHOWERS AT KTWF AND KJER ENDING BY 12Z. SCATTERED SHOWERS MOVING
INTO THE AREA FROM THE WEST-SOUTHWEST AFTER 12Z PRODUCE MVFR AND IFR
CONDITIONS. LIGHT SNOW EXPECTED TO CHANGE TO RAIN BELOW 5K FT EARLY
MONDAY AFTERNOON SOUTH OF A KBNO-KBOI-KJER LINE. SURFACE WINDS
SOUTHERLY AROUND 10 KTS TODAY. WINDS ALOFT NEAR 10K FEET MSL...WSW
10-20KT BECOMING WSW 25-40KT MONDAY AFTERNOON.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...WINTER WEATHER ADVISORY FROM 11 AM THIS MORNING TO 11 PM MST
     THIS EVENING IDZ011-033.
OR...NONE.

&&

WEATHER.GOV/BOISE

SHORT TERM...SP
LONG TERM....JS
AVIATION.....JS

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 winter weather. Local standard time, as filed.

Winter Weather, Western Magic Valley

When: December 1, 5:30 AM MST to 6:10 AM MST
Where: Western Magic Valley forecast zone
Deaths: 2 direct, 0 indirect
Reported by: Newspaper
Coordinates: 42.672, -114.581 (the zone’s center; the record gives no point)

Two fatalities occurred in Jerome County in two separate incidents in the early morning due to snow covered roads. The first accident occurred at 5:37 AM on Interstate 84 near mile marker 179 when the vehicle slid into the median and rolled over. The second occurred at 6:06 AM on Interstate 84 near mile marker 170. The vehicle overturned after hitting an icy patch on an overpass.

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.

Event	Date	Age	Sex	Where	Kind
Winter Weather, Western Magic Valley	2014-12-01	51	Male	Other	Direct
Winter Weather, Western Magic Valley	2014-12-01			Other	Direct

What these are

Winter Weather: Snow, sleet or freezing rain below warning levels that still caused disruption, damage or casualties.

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

The same day elsewhere

Every storm in Idaho in 2014 Every state in 2014 This day in weather history Warnings in Idaho, December 2014

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: 552151.