National Weather Service United States Department of Commerce

Tracking Two Storms Crossing the U.S. with Rain, Snow and Gusty Winds

A storm gathering strength over Texas today will shift to the Mid-Atlantic through Tuesday night. Areas of freezing rain and heavy snow will spread from the central Plains east into the Mid-Atlantic and southern New England. Further south, areas of severe thunderstorms and heavy rain are possible from the southern Plains into the Ohio Valley. A Pacific storm will move into the Southwest Monday. Read More >

A High Wind Warning is in effect for the Kern County desert until midnight Monday night. A High Wind Warning means that a hazardous, high wind event is expected. Here are projected wind gusts valid at 7 PM PST Monday evening, January 25th, 2021.
A Winter Storm Warning is in effect for the Kern County mountains until 10 PM PST Monday night. The majority of this snow will fall this morning. Accumulating snowfall over Kern County mountain passes today may cause travel delays and road closures. If you plan to travel, consider alternate strategies. If you must travel, remember to carry plenty of food, a good deal of water, and warm clothing in your vehicle. For information on road conditions, including closures or delays, call Caltrans at 1-800-427-7623.
A Winter Weather Advisory is in effect for the Sierra Nevada and adjacent foothills until 4 PM PST this afternoon. A Winter Weather Advisory for snow means that periods of snow may cause travel difficulties. The majority of snow will fall this morning. If you plan to travel, consider alternate strategies. If you must travel, remember to carry tire chains, plenty of food, a good deal of water, and warm clothing in your vehicle. For information on road conditions, including closures or delays, call Caltrans at 1-800-427-7623.
A major storm system will impact Central California Tuesday night through Thursday night. Three to four feet of snow is conceivable in the Sierra Nevada above 5,000 feet Tuesday night into Wednesday night, resulting in the possibility of extreme winter storm conditions due to blowing snow and snow load.
Deep, subtropical moisture funneled into Central California will be responsible for the possibility of heavy to excessive rainfall Wednesday and Wednesday night. There is a marginal (5-10%) risk of excessive rainfall in Merced County, as well as in the western portions of Madera, Fresno, and Kings Counties.

 

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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
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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.