LITTLE COTTONWOOD CANYON HRRR-DERIVED FORECAST GUIDANCE *************************************************************** * THIS IS AN EXPERIMENTAL, AUTOMATED, AND UNOFFICIAL FORECAST * *************************************************************** CREATED/MAINTAINED BY THE STEENBURGH GROUP DEPARTMENT OF ATMOSPHERIC SCIENCES UNIVERSITY OF UTAH CONTACT: JIM.STEENBURGH AT UTAH.EDU AMB: MT BALDY (11066 FT); ALT:TOP COLLINS (10443 FT); IFF: CARDIFF PK (10059) CLN:COLLINS (9662 FT); ATH20:ATWATER (8752 FT); ELBUT:Elberts (7600 FT) WINDS, TEMPERATURES, SNOW-TO-LIQUID RATIO (SLR) AND SNOW WATER CONTENT (H2O) USE HRRR-BASED MACHINE LEARNING HEIGHT OF WET BULB ZERO LEVEL (WBZ) DERIVED FROM HRRR PROFILE OVER KSLC 1H WATER EQUIVALENT PRECIPITATION (1HP) AND TOTAL WATER EQUIVALENT PRECIPITATION (TP) FROM NEAREST HRRR GRIDPOINT TO CLN 1H SNOW (1HS) AND TOTAL SNOW (TS) USE HOURLY SLR APPLIED TO 1HP BASED ON 00Z 14-DEC-2025 INITIALIZED HRRR WINDS (MPH) TEMPERATURES (F) SLR/H2O 1HP/TP (in) 1HS/TS (in) FHR VALID MOUNTAIN TIME AMB ALT IFF AMB ALT CLN ATH20 ELBUT WBZ(ftMSL) CLN CLN CLN 1 06 PM Sat Dec 13 2025 NW10G13 NW04G06 WNW06G09 37F 38F 31F 40F 38F 6700FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 2 07 PM Sat Dec 13 2025 NNW11G14 NW04G07 NW07G08 34F 36F 29F 35F 31F 6700FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 3 08 PM Sat Dec 13 2025 NW12G14 NW04G07 WNW08G10 33F 35F 29F 34F 30F 6900FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 4 09 PM Sat Dec 13 2025 NW11G13 S04G06 NW08G09 34F 36F 29F 32F 30F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 5 10 PM Sat Dec 13 2025 NW11G12 S04G05 WSW07G10 34F 35F 30F 33F 32F 7200FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 6 11 PM Sat Dec 13 2025 SSE11G13 S05G07 WSW08G11 35F 36F 30F 33F 31F 7300FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 7 12 AM Sun Dec 14 2025 SSW12G15 S05G08 WSW10G13 35F 36F 30F 33F 33F 7300FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 8 01 AM Sun Dec 14 2025 S13G16 S06G09 SW10G15 35F 36F 32F 35F 33F 7200FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 9 02 AM Sun Dec 14 2025 SSW13G18 S06G11 SW11G15 35F 36F 33F 35F 33F 7200FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 10 03 AM Sun Dec 14 2025 SSW13G20 S06G11 SW12G16 35F 36F 33F 35F 33F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 11 04 AM Sun Dec 14 2025 SSW14G21 SSW07G10 SW12G17 35F 35F 33F 35F 34F 6900FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 12 05 AM Sun Dec 14 2025 SW15G22 SSW07G12 SW12G19 35F 35F 33F 34F 33F 7000FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 13 06 AM Sun Dec 14 2025 SW16G24 SSW07G13 SW13G20 35F 35F 33F 35F 33F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 14 07 AM Sun Dec 14 2025 SSW18G26 SSW08G15 SW14G20 35F 34F 32F 35F 32F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 15 08 AM Sun Dec 14 2025 SSW17G27 SSW08G15 SW14G21 34F 35F 33F 36F 33F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 16 09 AM Sun Dec 14 2025 SSW18G26 SSW08G14 SW14G19 34F 35F 32F 37F 33F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 17 10 AM Sun Dec 14 2025 SSW17G28 SSW08G15 SSW14G21 35F 37F 34F 41F 33F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 18 11 AM Sun Dec 14 2025 SSW17G30 SSW08G17 SSW15G23 34F 39F 34F 46F 34F 7000FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 19 12 PM Sun Dec 14 2025 SSW17G31 SSW09G18 SSW15G24 34F 38F 36F 49F 38F 6800FT 10:1/10% 0.00/0.00 0.0/ 0.0 20 01 PM Sun Dec 14 2025 SSW17G33 SSW10G19 SSW15G25 35F 39F 38F 50F 40F 6900FT 10:1/10% 0.00/0.00 0.0/ 0.0 21 02 PM Sun Dec 14 2025 SSW16G30 SSW09G19 SSW15G23 34F 40F 38F 51F 44F 7100FT 10:1/10% 0.00/0.00 0.0/ 0.0 22 03 PM Sun Dec 14 2025 SW14G28 SSW09G18 SSW14G24 35F 40F 38F 50F 43F 7300FT 9:1/11% 0.00/0.00 0.0/ 0.0 23 04 PM Sun Dec 14 2025 SW14G29 SW08G18 SSW14G21 35F 39F 35F 49F 41F 7400FT 10:1/10% 0.00/0.00 0.0/ 0.0 24 05 PM Sun Dec 14 2025 SW16G29 SW09G17 SSW13G20 35F 39F 33F 47F 40F 7400FT 10:1/10% 0.00/0.00 0.0/ 0.0 25 06 PM Sun Dec 14 2025 WSW16G29 SW09G17 SW13G19 35F 38F 34F 41F 37F 7500FT 10:1/10% 0.00/0.00 0.0/ 0.0 26 07 PM Sun Dec 14 2025 WSW17G27 WSW08G16 SW12G18 34F 37F 32F 37F 35F 7400FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 27 08 PM Sun Dec 14 2025 W16G26 WSW08G15 SW12G18 33F 35F 31F 35F 32F 7400FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 28 09 PM Sun Dec 14 2025 W17G25 W08G14 WSW11G17 32F 34F 31F 34F 32F 4300FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 29 10 PM Sun Dec 14 2025 W17G25 W08G14 WSW10G17 32F 34F 31F 33F 31F 7200FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 30 11 PM Sun Dec 14 2025 W17G25 W08G13 WSW10G17 31F 34F 31F 33F 32F 7200FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 31 12 AM Mon Dec 15 2025 W16G24 W08G14 WSW11G18 31F 34F 31F 34F 32F 7200FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 32 01 AM Mon Dec 15 2025 W17G27 W08G14 WSW10G19 30F 34F 30F 34F 31F 7200FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 33 02 AM Mon Dec 15 2025 W19G27 W08G15 WSW11G18 30F 33F 31F 33F 32F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 34 03 AM Mon Dec 15 2025 W18G25 W08G14 W10G17 29F 33F 31F 32F 31F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 35 04 AM Mon Dec 15 2025 W19G26 W08G14 W10G17 28F 33F 30F 33F 30F 7100FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 36 05 AM Mon Dec 15 2025 W18G24 W07G12 W10G15 28F 33F 30F 32F 30F 7000FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 37 06 AM Mon Dec 15 2025 WNW18G24 WNW07G10 W09G15 28F 31F 29F 31F 29F 7000FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 38 07 AM Mon Dec 15 2025 WNW18G21 WNW06G09 WNW08G12 27F 31F 28F 31F 29F 7000FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 39 08 AM Mon Dec 15 2025 WNW17G22 WNW06G10 WNW07G11 27F 30F 27F 31F 28F 7000FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 40 09 AM Mon Dec 15 2025 WNW17G22 WNW06G10 W08G12 28F 31F 27F 33F 29F 6900FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 41 10 AM Mon Dec 15 2025 WNW16G22 W06G10 WSW07G12 30F 33F 30F 38F 30F 6900FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 42 11 AM Mon Dec 15 2025 WNW16G23 WNW06G11 WSW07G12 30F 35F 31F 42F 29F 6800FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 43 12 PM Mon Dec 15 2025 WNW15G24 WNW07G12 SW08G14 33F 37F 34F 46F 35F 6700FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 44 01 PM Mon Dec 15 2025 WNW17G27 WNW07G13 WSW08G13 34F 37F 35F 47F 39F 6700FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 45 02 PM Mon Dec 15 2025 WNW15G25 WNW07G13 WSW07G11 33F 38F 37F 46F 42F 6800FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 46 03 PM Mon Dec 15 2025 WNW14G26 WNW07G13 WSW08G15 33F 37F 37F 47F 41F 6800FT 11:1/ 9% 0.00/0.00 0.0/ 0.0 47 04 PM Mon Dec 15 2025 WNW17G27 WNW07G14 WSW08G15 32F 37F 33F 45F 39F 6800FT 10:1/10% 0.00/0.00 0.0/ 0.0 48 05 PM Mon Dec 15 2025 WNW18G27 WNW08G14 WSW08G15 32F 36F 34F 43F 39F 6900FT 11:1/ 9% 0.00/0.00 0.0/ 0.0