I'm afraid so, kids. Just when you thought it was safe to go outside again, southerly winds on Saturday and Sunday ahead of an approaching cold front will bring high temperatures in the 90s and high, tropical humidities. The national Weather Service has issued heat advisories for most of the state, from Frederick County to Harford County, and south to the Potomac (along with much of northern and easternm Virginia). It will be in effect Saturday from noon to 6 p.m. Here's how it goes:

"THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A
HEAT ADVISORY...WHICH IS IN EFFECT FROM NOON TO 6 PM EDT
SATURDAY.

"HIGH TEMPERATURES SATURDAY ARE FORECAST INTO THE LOW AND MID 90S.
COMBINED WITH HIGH HUMIDITY...THIS WILL CREATE HEAT INDEX VALUES
AROUND 100 DEGREES.

"HEAT RELATED INJURIES WILL BE POSSIBLE IF APPROPRIATE ACTION IS
NOT TAKEN. REDUCE PHYSICAL ACTIVITY...ESPECIALLY DURING THE
HOTTEST PART OF THE DAY. DRINK PLENTY OF FLUIDS...WATER IS YOUR
BEST CHOICE. STAY OUT OF THE SUN FOR PROLONGED PERIODS.

"THE ELDERLY AND THE YOUNG ARE MOST SUSCEPTIBLE TO HEAT RELATED
INJURIES...SO BE SURE TO CHECK ON ELDERLY RELATIVES AND
NEIGHBORS. DO NOT KEEP CHILDREN OR PETS IN CARS WITH WINDOWS
ROLLED UP...EVEN PARTIALLY. TEMPERATURES INSIDE A CAR WITH
WINDOWS UP CAN REACH OVER 150 DEGREES QUICKLY...RESULTING IN HEAT
STROKE AND DEATH."

Once the cold front and any associated showers and thunderstorms push through late Sunday, we'll return to more seasonable daytime highs in the low 80s and high 70s, and overnight lows in the (Gasp! Open the windows!) 50s and 60s.