NWS says 14 inches.
We know it'll be 8.

The National Weather Service overpredicts snowfall by 53% on average across the resorts we track. In extreme cases, NWS has forecast 25" when only 6" fell. StormDrop applies empirical calibration derived from 183 verified storms and SNOTEL ground-truth measurements, giving you a corrected estimate instead of the raw — and frequently inflated — NWS number.

SNOTEL (SNOwpack TELemetry) is a network of 900+ automated weather stations operated by the USDA NRCS, positioned at high elevations across the mountain West. They measure snow depth, snow water equivalent, temperature, and precipitation — an objective record of what actually falls. StormDrop uses SNOTEL readings as ground truth to verify every NWS forecast and build resort-specific calibration models.

StormDrop monitors 31 ski road corridors from 5 state DOTs (CDOT, UDOT, NDOT, CalTrans, WSDOT) in real time. For high-stakes corridors like I-70 Eisenhower Tunnel, US-2 Stevens Pass, and Little Cottonwood Canyon, we surface live chain control and closure status directly on each resort page — so you know before you leave the driveway.

StormDrop is the only app that calibrates NWS forecasts against SNOTEL ground truth for 76 specific resorts. Instead of showing you the raw model output, we show you a corrected estimate backed by 183 verified storms — plus real-time road conditions, local knowledge from the TGR community, storm alert emails, and smart booking links.

Timing is everything — and it depends on the resort, the storm, and the road. StormDrop's access planner surfaces the optimal departure window for each resort. For Little Cottonwood Canyon that often means being past the gate before 6:30am or waiting until 10:30am after avalanche control. For Breckenridge, it means beating the I-70 backup at Eisenhower Tunnel. We pull live DOT data so you get a specific answer, not a generic forecast.

OpenSnow's meteorologists provide solid qualitative forecasting. Where StormDrop differs: we apply quantitative calibration derived from 183 verified storms and SNOTEL ground truth. When NWS says 18" and our data shows a resort historically gets 60% of the NWS forecast, you see 11" — not 18". Both have a place in a powder chaser's toolkit; StormDrop focuses on verified numbers.

StormDrop Premium is $500/year with a 7-day free trial — no credit card required to start. That's $1.37/day during ski season. A single drive to a busted forecast typically costs more than a full year of StormDrop.

StormDrop covers 76 resorts across the US and Canada, including Alta, Snowbird, Park City, Palisades Tahoe, Mammoth, Breckenridge, Vail, Copper Mountain, Jackson Hole, Big Sky, Stevens Pass, Crystal Mountain, and Mt. Baker — plus dozens more.

A SNOTEL-calibrated forecast adjusts the raw NWS output based on how accurate that forecast has historically been at a specific resort. If NWS has overpredicted by 40% across 183 storms at a given mountain, StormDrop's calibrated number reflects that pattern — showing you what historically falls on the ground, not what the model outputs.

StormDrop monitors all 76 covered resorts continuously and sends email alerts when a storm reaches Level 2 (12–24" forecast) or higher. Level 3 (24–48") and Level 4 (48"+) events trigger high-priority alerts. Every alert includes the calibrated estimate, road corridor status, powder density grade, and booking links for flights, hotels, and rental cars.