Excessive Heat Warning Remains in Effect

From National Weather Service
243 PM PDT TUE JUL 28 2009

..EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL 10 PM PDT THURSDAY FOR INTERIOR PORTIONS OF SOUTHWEST WASHINGTON AND NORTHWEST OREGON ...
THE EXCESSIVE HEAT WARNING IS NOW IN EFFECT UNTIL 10 PM PDT THURSDAY.
HIGH TEMPERATURES YESTERDAY AFTERNOON WERE IN THE 100 TO 105 DEGREE RANGE FOR INTERIOR LOCATIONS. THIS AFTERNOON VALLEY TEMPERATURES ARE ALREADY IN THE TRIPLE DIGITS AT 2 PM...WITH 90 DEGREES AT ASTORIA ON THE NORTHERN OREGON COAST. TODAY AND WEDNESDAY HIGH TEMPERATURES INLAND ARE EXPECTED TO BE AROUND 105 DEGREES. EVEN THE COAST RANGE AND CASCADES WILL BE HOT...WITH TEMPERATURES CLIMBING WELL INTO THE 90S DURING THIS HEAT WAVE.
TEMPERATURES WILL BE A LITTLE COOLER THURSDAY...HOWEVER MAXIMUM TEMPERATURES WILL STILL BE NEAR 100 DEGREES.
IN ADDITION TO THE HOT AFTERNOONS...LITTLE RELIEF FROM THE HEAT IS EXPECTED OVERNIGHT. WITH LITTLE TO NO COOLING INFLUENCE FROM THE OCEAN...AND A SOMEWHAT HUMID AIR MASS IN PLACE...NIGHTS WILL REMAIN QUITE UNCOMFORTABLE AWAY FROM THE COAST. THIS WILL ESPECIALLY BE THE CASE IN URBAN AREAS SUCH AS PORTLAND AND VANCOUVER. PORTLAND TIED THE ALL-TIME RECORD HIGH MINIMUM TEMPERATURE OF 74 DEGREES MONDAY NIGHT. OVERNIGHT LOW TEMPERATURES TONIGHT AND WEDNESDAY NIGHT WILL BE SIMILARLY WARM. THIS LACK OF OVERNIGHT RELIEF MAY MAKE THIS HEATWAVE PARTICULARLY DANGEROUS IN THE CITIES...ESPECIALLY FOR THOSE WITHOUT ACCESS TO AIR CONDITIONING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF DANGEROUSLY HOT TEMPERATURES WILL OCCUR. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY WILL COMBINE TO CREATE A DANGEROUS SITUATION IN WHICH HEAT ILLNESSES ARE LIKELY. DRINK PLENTY OF FLUIDS...STAY IN AN AIR CONDITIONED ROOM...STAY OUT OF THE SUN...AND CHECK UP ON RELATIVES AND NEIGHBORS.