ALTA/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@utah.edu WETBULBZERO, 1H QPF, ACCUM QPF DIRECTLY FROM HRRR COLLINS SNOW RATIO/H2O, MT BALDY T/RH, MT BALDY WIND, 1H SNOW, and ACCUM SNOW based on machine learning including UU RF SLR algorithm Based on 12Z 07-Sep-2025 intialized HRRR FORECAST HOURS 0-48 FHR VALID MOUNTAIN TIME COLLINS T MT BALDY T/RH MT BALDY WIND WETBULBZERO SLR/H2O 1H QPF / 1H SNOW / ACCUM QPF / ACCUM SNOW 0 06 AM Sun Sep 07 2025 44F 43F / 69% WSW 15 G 21 MPH 13200 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 1 07 AM Sun Sep 07 2025 44F 43F / 65% WSW 14 G 20 MPH 13100 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 2 08 AM Sun Sep 07 2025 45F 44F / 57% W 15 G 21 MPH 12800 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 3 09 AM Sun Sep 07 2025 46F 45F / 52% W 15 G 21 MPH 13000 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 4 10 AM Sun Sep 07 2025 50F 45F / 49% WSW 13 G 19 MPH 12900 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 5 11 AM Sun Sep 07 2025 54F 46F / 46% WSW 11 G 19 MPH 12800 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 6 12 PM Sun Sep 07 2025 56F 48F / 40% WSW 9 G 17 MPH 12800 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 7 01 PM Sun Sep 07 2025 57F 49F / 39% WSW 10 G 19 MPH 13000 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 8 02 PM Sun Sep 07 2025 60F 50F / 37% SW 9 G 21 MPH 13400 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 9 03 PM Sun Sep 07 2025 60F 50F / 31% SW 10 G 20 MPH 13700 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 10 04 PM Sun Sep 07 2025 53F 47F / 42% SSW 10 G 20 MPH 13600 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 11 05 PM Sun Sep 07 2025 55F 48F / 42% SW 9 G 17 MPH 13600 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 12 06 PM Sun Sep 07 2025 56F 50F / 31% SW 11 G 24 MPH 13000 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 13 07 PM Sun Sep 07 2025 53F 49F / 39% SW 14 G 23 MPH 13400 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 14 08 PM Sun Sep 07 2025 49F 46F / 48% WSW 16 G 27 MPH 13000 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 15 09 PM Sun Sep 07 2025 48F 46F / 42% SW 17 G 26 MPH 12900 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 16 10 PM Sun Sep 07 2025 48F 46F / 50% SW 17 G 27 MPH 13000 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 17 11 PM Sun Sep 07 2025 47F 45F / 53% SSW 18 G 30 MPH 12900 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 18 12 AM Mon Sep 08 2025 47F 45F / 50% SSW 17 G 31 MPH 12600 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 19 01 AM Mon Sep 08 2025 47F 45F / 45% SSW 19 G 34 MPH 11400 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 20 02 AM Mon Sep 08 2025 45F 44F / 37% SW 22 G 36 MPH 11300 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 21 03 AM Mon Sep 08 2025 45F 44F / 40% SW 22 G 38 MPH 11300 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 22 04 AM Mon Sep 08 2025 44F 43F / 32% SW 22 G 38 MPH 11200 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 23 05 AM Mon Sep 08 2025 44F 43F / 24% WSW 23 G 37 MPH 11300 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 24 06 AM Mon Sep 08 2025 43F 44F / 24% WSW 22 G 33 MPH 11400 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 25 07 AM Mon Sep 08 2025 42F 43F / 25% SW 21 G 32 MPH 11500 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 26 08 AM Mon Sep 08 2025 44F 43F / 29% WSW 19 G 28 MPH 11700 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 27 09 AM Mon Sep 08 2025 46F 44F / 32% WSW 16 G 24 MPH 11500 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 28 10 AM Mon Sep 08 2025 50F 45F / 30% WSW 13 G 22 MPH 11300 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 29 11 AM Mon Sep 08 2025 54F 46F / 36% SW 12 G 23 MPH 11300 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 30 12 PM Mon Sep 08 2025 56F 47F / 32% SW 12 G 24 MPH 11600 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 31 01 PM Mon Sep 08 2025 58F 48F / 42% SW 12 G 25 MPH 12100 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 32 02 PM Mon Sep 08 2025 60F 49F / 39% SSW 12 G 26 MPH 12600 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 33 03 PM Mon Sep 08 2025 59F 49F / 43% SW 11 G 25 MPH 12500 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 34 04 PM Mon Sep 08 2025 59F 50F / 44% SW 12 G 25 MPH 12700 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 35 05 PM Mon Sep 08 2025 59F 50F / 41% SW 12 G 24 MPH 12700 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 36 06 PM Mon Sep 08 2025 56F 49F / 33% SW 13 G 26 MPH 12700 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 37 07 PM Mon Sep 08 2025 55F 51F / 34% SW 15 G 27 MPH 13100 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 38 08 PM Mon Sep 08 2025 50F 48F / 43% SW 14 G 25 MPH 13200 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 39 09 PM Mon Sep 08 2025 49F 47F / 47% SW 15 G 25 MPH 13200 FT 0:1 / -% 0.00" / 0.0" 0.00" / 0.0" 40 10 PM Mon Sep 08 2025 48F 47F / 72% SSW 16 G 26 MPH 13900 FT 0:1 / -% 0.04" / 0.0" 0.04" / 0.0" 41 11 PM Mon Sep 08 2025 48F 46F / 57% SSW 16 G 32 MPH 13200 FT 0:1 / -% 0.01" / 0.0" 0.05" / 0.0" 42 12 AM Tue Sep 09 2025 47F 46F / 50% SSW 18 G 33 MPH 12800 FT 0:1 / -% 0.00" / 0.0" 0.05" / 0.0" 43 01 AM Tue Sep 09 2025 45F 45F / 54% SSW 18 G 34 MPH 12600 FT 0:1 / -% 0.00" / 0.0" 0.05" / 0.0" 44 02 AM Tue Sep 09 2025 46F 44F / 57% SSW 17 G 28 MPH 12300 FT 0:1 / -% 0.00" / 0.0" 0.05" / 0.0" 45 03 AM Tue Sep 09 2025 45F 44F / 59% S 17 G 30 MPH 12700 FT 0:1 / -% 0.00" / 0.0" 0.05" / 0.0" 46 04 AM Tue Sep 09 2025 45F 43F / 65% S 19 G 34 MPH 12700 FT 0:1 / -% 0.00" / 0.0" 0.05" / 0.0" 47 05 AM Tue Sep 09 2025 44F 43F / 65% SSW 18 G 34 MPH 12500 FT 0:1 / -% 0.00" / 0.0" 0.05" / 0.0" 48 06 AM Tue Sep 09 2025 45F 44F / 61% S 19 G 34 MPH 12000 FT 0:1 / -% 0.00" / 0.0" 0.05" / 0.0"