National Weather Service United States Department of Commerce

Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

 

Pictures from around western Colorado and eastern Utah

 

SURFACE  |  UPPER AIR  |  CAMERAS  |  WINTER DATA  | ROAD CONDITIONS 

 

Winter Data

 Snow data  | Avalanche Information | Snow Information  |  Wind Chill 

 Snow Data

Daily SNOTEL Reports using Old 1961 to 1990 climate averages. From NRCS 

"SNOTEL (Snow Telemetry) is a remote measuring system, operated and maintained by the Snow Survey branch of the Natural Resources Conservation Service , designed to determine the water equivalent (not snow depth) of mountain snowpacks. 

Avalanche Information

Snow Information

Wind Chill 

 

 

Wind Chill Chart
Temperature (°F)
Wind
Speed
(MPH)
calm 40 35 30 25 20 15 10 5 0 -5 -10 -15 -20 -25
5 36 31 25 19 13 7 1 -5 -11 -16 -22 -28 -34 -40
10 34 27 21 15 9 3 -4 -10 -16 -22 -28 -35 -41 -47
15 32 25 19 13 6 0 -7 -13 -19 -26 -32 -39 -45 -51
20 30 24 17 11 4 -2 -9 -15 -22 -29 -35 -42 -48 -55
25 29 23 16 9 3 -4 -11 -17 -24 -31 -37 -44 -51 -58
30 28 22 15 8 1 -5 -12 -19 -26 -33 -39 -46 -53 -60
35 28 21 14 7 0 -7 -14 -21 -27 -34 -41 -48 -55 -62
40 27 20 13 6 -1 -8 -15 -22 -29 -36 -43 -50 -57 -64
45 26 19 12 5 -2 -9 -16 -23 -30 -37 -44 -51 -58 -65

"Calm-air" as used in wind chill determinations actually refers to the conditions created by a person walking briskly (at 4 miles-per-hour) under calm wind conditions.

Frostbite Time for Exposed Skin (minutes)

  30   15   10   5