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Real-time wind speeds, peak gusts, and surface chop forecasts from NOAA National Weather Service, verified public boat launches, USGS surface water telemetry, and Wyoming state boating regulations for Jenny Lake (Wyoming).
Peak Gusts: 26 mph. Moderate surface chop across main fetch.
Cold Shock Hazard: Life jackets are strongly urged for all vessel occupants across open water.
Ramp Accessibility: Water level referenced at 6,783 ft MSL for launch ramp clearance across public access points.
Advisory Threshold: Official Lake Wind Advisories trigger when sustained winds reach 15 mph or waves exceed 3 ft.
Current index calculated from verified local atmospheric, hydrographic & alert inputs.
Fair for boating (64/100), from 4 available inputs. Supporting this: Wind 1 mph from the west-southwest. Gusts to 1 mph. Working against it: 82% chance of precipitation is likely. The forecast mentions thunderstorms, which carries a risk penalty. Not available from a verified source for this lake: visibility and conditions, verified water access. Confidence is moderate (84%) because some inputs are unavailable or older than ideal.
| Forecast Time | Wind (mph) | Gust (mph) | Direction | Surface Chop & Fetch | Watercraft Readiness |
|---|---|---|---|---|---|
| 10 PM | 1 mph | 1 mph | W | Calm mirror surface; flat wake navigation | Optimal |
| 11 PM | 3 mph | 6 mph | E | Calm mirror surface; flat wake navigation | Optimal |
| 12 AM | 3 mph | 6 mph | S | Calm mirror surface; flat wake navigation | Optimal |
| 1 AM | 6 mph | 8 mph | S | Light surface ripple; gentle boat glide | Optimal |
| 2 AM | 5 mph | 8 mph | S | Calm mirror surface; flat wake navigation | Optimal |
| 3 AM | 3 mph | 7 mph | S | Calm mirror surface; flat wake navigation | Optimal |
| 4 AM | 6 mph | 9 mph | S | Light surface ripple; gentle boat glide | Optimal |
| 5 AM | 7 mph | 10 mph | S | Light surface ripple; gentle boat glide | Optimal |
| 6 AM | 9 mph | 14 mph | S | Light surface ripple; gentle boat glide | Favorable |
| 7 AM | 7 mph | 12 mph | S | Light surface ripple; gentle boat glide | Optimal |
| 8 AM | 8 mph | 13 mph | S | Light surface ripple; gentle boat glide | Optimal |
| 9 AM | 9 mph | 15 mph | S | Light surface ripple; gentle boat glide | Favorable |
| 10 AM | 9 mph | 15 mph | S | Light surface ripple; gentle boat glide | Favorable |
| 11 AM | 8 mph | 14 mph | S | Light surface ripple; gentle boat glide | Optimal |
| 12 PM | 8 mph | 12 mph | S | Light surface ripple; gentle boat glide | Optimal |
| 1 PM | 6 mph | 9 mph | S | Light surface ripple; gentle boat glide | Optimal |
| 2 PM | 6 mph | 8 mph | S | Light surface ripple; gentle boat glide | Optimal |
| 3 PM | 5 mph | 8 mph | S | Calm mirror surface; flat wake navigation | Optimal |
Surface chop expands with sustained wind duration across Jenny Lake's open water fetch. Early morning hours typically offer the calmest navigation before thermal afternoon winds develop.
Individual boat ramp GPS coordinates are currently being cataloged for Jenny Lake. Public launches are managed by state, county, or local park authorities.
Ramp operational status and courtesy dock availability are subject to seasonal water level shifts and lake management authority guidelines.
Current index calculated from verified local atmospheric, hydrographic & alert inputs.
Fair for kayaking (63/100), from 5 available inputs. Supporting this: Wind 1 mph from the west-southwest. Gusts to 1 mph. Working against it: 82% chance of precipitation is likely. The forecast mentions thunderstorms, which carries a risk penalty. Confidence is high (90%).