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Think twice before you head to area rivers and streams this week. Water temperatures in the rivers are cold at this time of year and can cause a shock to the body shortly after exposure. Additionally, swift undercurrents in the rivers can carry even an experienced swimmer quickly downstream and into trees and other vegetation along the banks. If you decide to swim, please wear a life-vest. It could save someone you love or your own life! Don’t be the next victim of a drowning or a water rescue.
Another round of hot temperatures will affect the area beginning Wednesday. High temperatures will surpass the century mark throughout much of the San Joaquin Valley, lower foothills and the Kern County Desert, especially over the weekend. Prolonged exposure to triple digit heat can pose a health risk to the elderly, persons with respiratory ailments and anyone who is not yet acclimated to hot weather. If you’re going to be outdoors during the hottest time of the day (between 1 pm and 6 pm), avoid strenuous exercise, stay hydrated and wear light colored, loose fitting clothing. Remember that going from hot air temperatures into cold water in area rivers could cause shock to the body and lead to drowning. Use caution if entering local waterways and remember to wear a life vest.
The first heat wave of 2018 will begin Thursday and continue through at least Sunday. High temperatures will be above the century mark over much of the San Joaquin Valley, lower foothills and the Kern County desert during this period, making it the longest stretch of triple digit heat so far this year. The hot weather could be especially stressful for those who haven’t yet acclimated themselves to it. Prolonged exposure to the heat could lead to heat stroke or heat exhaustion, especially during the hottest time of the day (12 pm to 6 pm). The hot weather will also increase the threat of new fire starts.

 

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Upper Air Observations


Raw Upper Air Sounding Data
RAW data for all US Soundings

Decoded Upper Level Winds

Plotted Upper Air Soundings

GOES Derived Atmospheric Vertical Soundings

Alternate Sources for Upper Air Soundings
University of Wyoming
Ohio State

California Wind Profiler Data Can be Found Here

Information About the Upper Air Program 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.