Arlington and much of the rest of the D.C. region is under a Heat Advisory for Thursday.
The National Weather Service issued the advisory Wednesday afternoon, warning of heat index values of more than 100 degrees and an elevated risk of heat-related illness for those spending time outdoors between noon and 8 p.m.
Those who are sensitive to the heat or performing outdoor activities should take proper precautions, authorities say.
More from NWS:
… HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM EDT THURSDAY… THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS ISSUED A HEAT ADVISORY, WHICH IS IN EFFECT FROM NOON TO 8 PM EDT THURSDAY. * TEMPERATURES… HIGHS IN THE MID TO UPPER 90S. * HEAT INDEX VALUES… AROUND 105 DEGREES. * IMPACTS… RISK OF HEAT-RELATED ILLNESS FOR THOSE WITHOUT AIR- CONDITIONING OR THOSE OUTDOORS FOR AN EXTENDED PERIOD. PRECAUTIONARY/PREPAREDNESS ACTIONS… A HEAT ADVISORY MEANS THAT A PERIOD OF HIGH TEMPERATURES IS EXPECTED. THE COMBINATION OF HIGH TEMPERATURES AND HIGH HUMIDITY WILL CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE POSSIBLE. TAKE EXTRA PRECAUTIONS IF YOU WORK OR SPEND TIME OUTSIDE. WHEN POSSIBLE, RESCHEDULE STRENUOUS ACTIVITIES TO EARLY MORNING OR EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND HEAT STROKE. WEAR LIGHT WEIGHT AND LOOSE FITTING CLOTHING WHEN POSSIBLE AND DRINK PLENTY OF WATER. TO REDUCE RISK DURING OUTDOOR WORK, THE OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE IS AN EMERGENCY – CALL 911. &&