453 am CDT Wed Aug 20 2014
... Hot and humid weather is on the way...
An upper-level ridge of high pressure will build across the region
by the end of the week... resulting in increasing temperature and
humidity levels. Afternoon highs will climb into the lower to
middle 90s Friday through Monday... while peak heat index values
top out in the 100 to 105 degree range.
This will be the longest and most sustained period of heat of the
entire Summer. People are urged to use caution if they must be outside
for extended periods of time. Drink plenty of fluids and take
frequent breaks to avoid overheating.
... High heat indices are expected over the weekend...
Warmer temperatures will move into the area this afternoon as a
warm front lifts northeast across central Illinois. These warmer
temperatures will combine with higher dewpoints to create heat
index values in the middle to upper 90s by this afternoon. By this
weekend... temperatures will have climbed into the lower to middle
90s and surface dewpoints will be in the lower 70s. This will
produce higher heat index values of around 100 for Friday through
This will be the first time this Summer that heat index readings
will be at this level and also for a duration of over two days.
Residents are therefore urged to use caution if outside for an
extended period of time. Drink plenty of fluids and take frequent
breaks so as not to become overheated.