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   Heat wave continues with no let up in sight
   UNDATED, Ala. (AP) -- Make plans to stay cool this weekend
because the intense heat blanketing the state shows no signs of
letting up.
   The National Weather Service office in Birmingham issued a heat
advisory yesterday for 39 of the state's 67 counties. It was set to
expire at 7 p.m. today but has now been extended through tomorrow.
   Thermometer readings were in the upper 90's yesterday from
Huntsville to Mobile with heat index values surpassing the 100
degree mark. More of the same is expected today.
   Meanwhile, the threat of heat-related illness remains high.
Health experts say the most important thing for people to remember
is to stay hydrated.
   To combat the loss of salts and potassium through sweating,
people should drink sports drinks that replenish electrolytes and
eat bananas to restore potassium.