THE WEATHER BEAT · EXPLAINER · OCT 19

Watch or warning? Interior Alaska's snowstorm splits: the mountains now under warnings, Fairbanks still on a watch

NWS Fairbanks upgraded the Alaska Range and Delta Junction to Winter Storm Warnings and kept Fairbanks on a watch. Here is what that difference means.

By the Weather Rock October 19, 2026, 8:46 a.m. · 6 min read

Isabel Pass, Alaska, looking toward the Gulkana Glacier — The Gulkana Glacier seen from Isabel Pass, about 12 miles north of Paxson, Alaska, photographed on 24 September 2010. Photo: Beeblebrox, Wikimedia Commons, CC BY-SA 3.0. This crop carries the same licence.

Key points

On Sunday afternoon, NWS Fairbanks turned most of its Interior Alaska Winter Storm Watches into Winter Storm Warnings. That covers the Eastern Alaska Range, Delta Junction, the Upper Tanana Valley, Fortymile Country, the Upper Chena River Valley and the Yukon Flats. Fairbanks, Nenana and the Denali Borough stayed under a watch.
A watch means heavy snow is possible. A warning means it is expected. The Fairbanks watch says why the forecast is still uncertain there: "A 30 mile change east or west will result in drastic differences."
The deepest snow is expected in the Eastern Alaska Range: 18 to 36 inches above 2,500 feet and 12 to 24 inches below it, from 7 a.m. Monday to 4 a.m. Thursday AKDT.

Yesterday

On Sunday morning, every Interior zone in this storm sat under the same product, a Winter Storm Watch, and The Weather Beat reported it that way. By 2:59 p.m. AKDT the map had split in two. Delta Junction and the mountains to its south got warnings. The Fairbanks area, a short drive up the Richardson Highway, kept its watch. That split is the clearest lesson the week has given in what the two words mean.

A watch is the National Weather Service saying the ingredients for a dangerous storm are on the way, but whether they come together over your town is not settled. A warning says the forecasters now expect it. It is not a stronger storm. It is a more certain forecast. Fairbanks' own Sunday watch shows how that works. The office wrote that there is "high uncertainty in the exact snow amounts and the placement of the heavier snow," that it is "leaning towards the heaviest snow being towards Eielson with lighter snow in Fairbanks and especially west of Fairbanks," and that "a 30 mile change east or west will result in drastic differences." When a town sits on the edge of the heavy snow, a watch is the honest product.

The mountains are past that point. In the 3:14 p.m. AKDT discussion, the office expects snow to fall at "rates exceeding 1 inch per hour at times Monday night through Tuesday night" in the Alaska Range. It adds that Isabel Pass could see totals "upwards of 2 to 3 feet."

The forecast also changed between the morning and afternoon products. These are the changes, with both numbers. The products give no reason for them.

Today, officially

As of the Sunday afternoon products, snow starts in the Alaska Range Monday afternoon and moves into the Interior Monday night. It continues through Wednesday. On Tuesday, gusty north and northwest winds may cut visibility in the range and the Eastern Interior. The discussion expects most of the snow to end by Wednesday afternoon. After that it turns cold, with lows "near 0 Thursday night across much of the Interior." Every product here was due to expire at 7 a.m. AKDT Monday, so a newer update may already have changed these figures. Watch for the next one. If Fairbanks moves from watch to warning, the forecasters have become more sure where the heavy snow will fall.

Product, NWS Fairbanks, 2:59 p.m. AKDT Sun Oct 18	Snow	Gusts	When
Warning: Eastern Alaska Range, above 2,500 ft	18 to 36 in expected, more above pass level (morning watch: 18 to 30 in possible)	40 mph	7 a.m. Mon to 4 a.m. Thu
Warning: Eastern Alaska Range, below 2,500 ft	12 to 24 in expected (morning watch: 12 to 18 in possible)	40 mph	7 a.m. Mon to 4 a.m. Thu
Warning: Delta Junction, Fortymile Country, Upper Tanana Valley	6 to 12 in; locally 12 to 18 in Tanacross to Dot Lake; 2 to 5 in Northway to the Alcan Border	35 mph	10 p.m. Mon to 4 p.m. Wed
Warning: Upper Chena River Valley, White Mountains, Eagle Summit, southern and eastern Yukon Flats	5 to 10 in; 1 to 3 in or less near Beaver and Livengood (morning watch, Yukon Flats: 4 to 8 in possible)	35 mph, higher elevations	10 a.m. Tue to 4 p.m. Wed
Watch: Fairbanks North Star Borough and Nenana	4 to 8 in possible		Tue morning to Wed afternoon
Watch: Denali Borough	6 to 12 in possible, more above pass level (morning watch: 8 to 12 in)	40 mph	Mon afternoon to Wed afternoon

Other products	Office, issued	Figures
Winter Weather Advisory, Thompson Pass	NWS Anchorage, 3:07 p.m. AKDT Sun	10 to 18 in, mainly near the top of the pass, 4 a.m. Mon to 4 a.m. Wed
Winter Weather Advisory, Northern Copper Valley	NWS Anchorage, 3:07 p.m. AKDT Sun	4 to 10 in, 4 a.m. Mon to 4 p.m. Tue
High Wind Watch, Skagway	NWS Juneau, 11:17 p.m. AKDT Sun	south winds 30 to 40 mph, gusts to 60 mph possible, Mon evening to Wed afternoon
Area Forecast Discussion	NWS Fairbanks, 3:14 p.m. AKDT Sun	Isabel Pass "upwards of 2 to 3 feet"; rates over 1 in per hour at times

*Source: NWS Fairbanks Winter Storm Warnings and Watches (2:59 p.m. AKDT Oct 18) and Area Forecast Discussion (3:14 p.m. AKDT Oct 18); NWS Anchorage Winter Weather Advisories (3:07 p.m. AKDT Oct 18); NWS Juneau High Wind Watch (11:17 p.m. AKDT Oct 18). The morning figures are from the 6:06 a.m. AKDT Oct 18 watches. Watch figures are "possible" ranges; warning figures are "expected" ranges.*

This is a morning summary, not emergency information. For live warnings see weather.gov and your local officials. NWS Fairbanks: https://www.weather.gov/afg/

The rock's live forecast for the places in this story