National Weather Service United States Department of Commerce

Severe Weather Threat in the North-central Great Plains

Strong to severe storms are expected to bring severe wind gusts and large hail across parts of South Dakota and Nebraska. Additional thunderstorm activity likely Sunday from the Northern Plains into the Upper Great Lakes. A fire weather threat continues from portions of the Great Basin into the Rockies. Read More >

High temperatures throughout Central California this afternoon will be two to four degrees warmer than Thursday. Maximum temperatures across Central California Saturday afternoon will be near normal for this time of year.
A warming trend is expected throughout the San Joaquin Valley today into the weekend. High temperatures across the San Joaquin Valley Sunday afternoon and Monday afternoon will be around five degrees above normal for this time of year. Dry weather will persist.
Remember cold and swift waters continue to move through our local streams and rivers, making them very dangerous to enter.


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Upper Air Observations

Decoded Upper Level Winds

Plotted Upper Air Soundings

GOES Derived Atmospheric Vertical Soundings

Alternate Sources for Upper Air Soundings
Ohio State

California Wind Profiler Data Can be Found Here

Why Do Forecasters Still Rely on Weather Balloons?

Twice every day, from nearly 100 locations in the United States, the National Weather Service launches weather balloons, carrying instrument packages called radiosondes. Radiosonde sensors measure upper-air conditions such as atmospheric pressure, temperature and humidity, wind speed and direction. The data is important for aviation safety, and meteorologists use radiosonde information to prepare weather forecasts.