National Weather Service United States Department of Commerce

Heavy Rainfall For Parts Of Louisiana and Texas; Elevated/Critical Fire Weather Conditions in the Great Basin

Heavy rain from tropical showers/thunderstorms are possible for areas of Louisiana and Texas. The heavy rain and possible flooding are likely to persist the next few days, especially in southeast Texas. Critical fire weather threats continue for much of the Great Basin, from dry/windy conditions. Finally, rip currents/heavy surf are likely to continue from Florida to the Carolinas from Humberto. Read More >

A High Wind Warning is in effect for the Southern Sierra Nevada crest from 12 PM PDT this afternoon until 9 PM PDT this evening. A High Wind Warning means that a hazardous, high wind event is expected or occurring. Destructive winds may blow down trees and power lines. Wind gusts of 58 miles per hour or more can lead to property damage.
A Wind Advisory is in effect for a portion of the Kern County mountains and desert from 2 PM PDT this afternoon until 11 PM PDT tonight. Strong wind gusts may blow down tree limbs and power lines. A few power outages are possible. Travel will be difficult, particularly for high profile vehicles. Highways affected include, but are not limited to Highway 14, U.S. Highway 395, Highway 58 below Tehachapi Pass, and Highway 178 below Walker Pass, including the town of Inyokern.
A few strong thunderstorms are possible in the Southern Sierra Nevada, north of Madera County, this afternoon and evening. Dangerous cloud to ground lightning strikes, funnel clouds, small hail, and wind gusts near 40 miles per hour are hazards associated with strong thunderstorms.
Light rain and high elevation snow is expected, north of Fresno County, this afternoon and evening. Precipitation amounts in the northern portion of the San Joaquin Valley will be light. The majority of this precipitation will fall this afternoon.


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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.