Sun Valley
ID · 9,150 ft summit · SUN
NWS Grade
2025–26 Season Snapshot
Storms This Season
39
storms tracked
Season Snowfall
46"
calibrated total
Best Storm
25/100
Tracked
Current Snowpack
26"
489:ID:SNTL
Avg Daily Rate
1.2"/day
storms with data
Season SWE
9.0"
snow water equivalent
NWS Forecast Accuracy
Good news — NWS underestimates snowfall here by -95%
Sun Valley typically receives 15.0× the NWS forecast amount. When NWS says 6 inches, you should expect closer to 90 inches. StormDrop calibrated estimates account for this.
With only 2 storms, patterns are tentative. Both events show extreme underprediction (95% error). Low snow levels and subfreezing temperatures characterize the largest error case. The 10× variance in actual/forecast ratio between storms suggests temperature and/or snow level are key moderators. Recommend collecting 5–10 additional storms for robust rule calibration.
Based on 2 verified storms · SNOTEL ground truth (489:ID:SNTL)
Storm History — 2025–26 Season
Apr 17 – Apr 17
NWS Forecast
0.2"
Calibrated
0.4"
Actual (SNOTEL)
Pending
Density: Average
Rate: 0.4"/day
Apr 16 – Apr 17
NWS Forecast
1.1"
Calibrated
2.2"
Actual (SNOTEL)
Pending
Density: Ultra-Light
Rate: 2.2"/day
Apr 15 – Apr 15
NWS Forecast
0.2"
Calibrated
0.4"
Actual (SNOTEL)
Pending
Density: Dense
Rate: 0.4"/day
Show 36 more storms
Apr 13 – Apr 13
Level 1 · 0" calibrated
Apr 13 – Apr 13
Level 1 · 0" calibrated
Apr 13 – Apr 13
Level 1 · 1" calibrated
Apr 13 – Apr 13
Level 1 · 1" calibrated
Apr 13 – Apr 13
Level 1 · 1" calibrated
Apr 13 – Apr 13
Level 1 · 1" calibrated
Apr 13 – Apr 13
Level 1 · 1" calibrated
Apr 13 – Apr 13
Level 1 · 1" calibrated
Apr 13 – Apr 13
Level 1 · 1" calibrated
Apr 13 – Apr 13
Level 1 · 1" calibrated
Apr 13 – Apr 13
Level 1 · 1" calibrated
Apr 3 – Apr 3
Level 1 · 0" calibrated
Apr 3 – Apr 3
Level 1 · 0" calibrated
Apr 3 – Apr 3
Level 1 · 0" calibrated
Apr 3 – Apr 3
Level 1 · 0" calibrated
Apr 2 – Apr 3
Level 1 · 1" calibrated
Apr 2 – Apr 3
Level 1 · 1" calibrated
Apr 2 – Apr 3
Level 1 · 1" calibrated
Apr 2 – Apr 3
Level 1 · 1" calibrated
Apr 2 – Apr 3
Level 1 · 1" calibrated
Apr 2 – Apr 3
Level 1 · 2" calibrated
Apr 2 – Apr 3
Level 1 · 2" calibrated
Apr 2 – Apr 3
Level 1 · 2" calibrated
Apr 2 – Apr 3
Level 1 · 2" calibrated
Apr 2 – Apr 3
Level 1 · 2" calibrated
Apr 2 – Apr 3
Level 1 · 2" calibrated
Apr 2 – Apr 3
Level 1 · 2" calibrated
Apr 2 – Apr 3
Level 1 · 2" calibrated
Apr 2 – Apr 3
Level 1 · 3" calibrated
Apr 2 – Apr 3
Level 1 · 3" calibrated
Apr 2 – Apr 3
Level 1 · 3" calibrated
Apr 2 – Apr 3
Level 1 · 3" calibrated
Apr 2 – Apr 3
Level 1 · 3" calibrated
Mar 31 – Mar 31
Level 1 · 0" calibrated
Mar 12 – Mar 12
Level 1 · 0" calibrated
Mar 11 – Mar 12
Level 1 · 0" calibrated
Local Knowledge
TGR Community IntelFull local intelligence for Sun Valley
$500/year · 7-day free trial — cancel anytime
Based on 6 community reports · 2019-01-07 → 2025-05-30
Road & Access
No live DOT road data available for Sun Valley.
Historical Patterns
Temperature effect: Colder storms (avg 25.9°F) show larger underprediction ratios (20×) than warmer storms (avg 30.9°F, 10× ratio). Suggests NWS may underestimate precipitation efficiency at near-freezing temperatures or mishandle cold-cloud dynamics.
Full intelligence for Sun Valley and 75 other resorts
Real-time storm alerts · Calibrated forecasts · Local knowledge · Trip logistics
Start 7-Day Free Trial — $500/yearCancel anytime · No commitment required