690  
FGUS76 KHNX 220120  
ESFHNX  
CAZ089>097-230000-  
 
HYDROLOGIC OUTLOOK  
NATIONAL WEATHER SERVICE HANFORD CA  
620 PM PDT WED JUN 21 2017  
 
...FAST FLOWING COLD WATER IN AREA RIVERS AND STREAMS IS  
DEADLY RIGHT NOW...  
 
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  
DROWNINGS.  
 
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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