Question 1

What is a spot forecast?

Accepted Answer

A spot forecast is a weather forecast for a precise geographic point rather than a broad region. The National Weather Service divides the US into a grid of roughly 1km cells. When you click on the map, this tool identifies the NWS grid cell that contains your click and returns the 7-day forecast for that exact cell — including temperature, wind, snow, cloud cover, and precipitation probability.

Question 2

How is this different from a regular weather forecast?

Accepted Answer

Standard weather apps give forecasts for the nearest city or a broad region. A spot forecast is modeled for a specific 1km grid cell, and the elevation of that cell is a primary input. This makes a real difference in the mountains — a forecast for a valley town may show rain while a ridge 2,000 feet above it gets snow. That said, the NWS model factors in more than just elevation: two locations a couple miles apart at similar elevations can produce noticeably different forecasts due to local terrain, aspect, and atmospheric modeling. The key limitation to understand is that each grid cell uses a single averaged elevation. If you click on a summit, the grid may cover a wide area of mixed terrain, and the averaged elevation could be significantly lower than the actual peak — which directly affects snow level predictions. If accurate snow level is critical, experiment by clicking nearby locations and comparing the displayed elevations until you find a grid cell whose elevation matches what you care about.

Question 3

Why does the purple grid appear on the map?

Accepted Answer

The purple polygon shows the exact NWS grid cell used for the forecast you just requested. Each cell covers roughly 1 square kilometer. The cell boundaries show you the precise area the forecast data represents.

Question 4

Can I use this for backcountry trip planning?

Accepted Answer

Yes — this tool is built with backcountry use in mind. Click directly on your intended trailhead, pass, or summit to get an elevation-adjusted forecast. Pay attention to the snow level, wind gust, and precipitation columns when evaluating avalanche and visibility conditions.

Question 5

Does this work outside the United States?

Accepted Answer

No. The National Weather Service grid forecast only covers the contiguous 48 states. Clicking outside the US will return an error. For international forecasts, tools like Open-Meteo or weather.gov equivalents in other countries are an alternative.

U.S. Spot Forecast

~1km grid resolution

Elevation-aware

Official NWS data

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