National Weather Service United States Department of Commerce

Rivers are fed by melting snow over the higher elevations of the Sierra this time of year. The warmer the air gets, the faster the snow melts and the more dangerous rivers become. Rivers will be running fast and deep during the next several weeks and they will be unsafe places for swimmers, rafters and boaters. Water temperatures in these rivers are only in the 40s to lower 50s. Exposure to water this cold can quickly lead to hypothermia. Don’t risk your life or safety by venturing into any of these rivers!


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Aviation Advisories
Before departure, call 1-800-WX-BRIEF for latest weather and file flight plans.
Advisories Observations Forecasts Aviation Info
AWC - Icing/Turbulence/Freezing Level and Volcanic Ash
Icing | Turbulence | Freezing Level | Volcanic Ash
Center Weather Service Units
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Airmets/Sigmets and Convective Sigmets
TEXT Products Zulu (Icing) Sierra (IFR and Mountain Obscuration) Tango (Turbulence)