• Hydrologic Outlook for Southeastern San Joaquin Valley County, California
  • Hydrologic Outlook issued June 21 at 6:20PM PDT until June 23 at 11:00PM PDT by NWS
  • Effective: Wednesday, June 21, 2017 at 6:20 p.m.
  • Expires: Friday, June 23, 2017 at 11 p.m.
    With record breaking heat across the Central California
    Interior...area rivers, lakes and streams are at very high
    levels due to the extensive winter snow pack melting at a very
    fast rate.
    As we enter the summer recreation season, the National Weather
    Service would like to remind people of the hidden dangers of the
    cold snow melt waters feeding Central California waterways.
    Area rivers, streams and reservoirs are directly fed from the
    melting snowpack on the Sierra Nevada. Even though a stream or
    river looks cool and inviting, the water is actually very cold
    ranging from 45 to 55 degrees Fahrenheit. Outdoor enthusiasts are
    advised to use extreme caution near rivers, streams and lakes. If
    possible please avoid these areas all together.
    If you are planning to travel to area rivers and streams,
    remember that the fast flowing and very cold water is a deadly
    combination. Although afternoon temperatures are expected to be
    100 to 110, water temperatures are in the upper 40`s to lower
    50`s. Up to fifteen minutes exposure to water this cold could lead
    to hypothermia, and the fast flow of the river can easily carry a
    rafter or swimmer quickly downstream...which can and has led to
    Hypothermia is a sudden loss of body temperature that can be
    fatal. Warning signs include uncontrolled shivering, slurred
    speech, drowsiness and apparent exhaustion. Even strong swimmers
    can tire quickly in the cold water. When you add a strong current
    and underwater debris, such as rocks, limbs and sharp objects,
    drowning becomes more likely.
    River fluctuations can and will occur without notice. River
    levels can change very quickly depending on upstream dam releases
    and debris in the rivers and streams, creating partial blocking
    of the water flow. If you are only near the edge of the river or
    stream, you could slip and fall. Don`t turn your back on the
    river or stream.
    Central California rivers and streams are Swift! Cold! and
    Dangerous! Many people have already lost their lives across the
    Central California Interior due to drowning in area rivers and
    streams. Please have life vests handy and keep a close eye on
    children and pets near the rivers edge.
    Stay tuned to our Facebook page at US National Weather Service
    Hanford or on our Twitter page @NWSHanford. Use
    #SwiftColdDangerous to follow on twitter feeds.
    Be Safe, not a Statistic!!

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