195  
WWUS71 KLWX 210743  
NPWLWX  
 
URGENT - WEATHER MESSAGE  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
343 AM EDT FRI JUL 21 2017  
 
MDZ503-505-210845-  
/O.CAN.KLWX.HT.Y.0005.170721T1400Z-170722T0000Z/  
NORTHWEST MONTGOMERY-NORTHWEST HOWARD-  
INCLUDING THE CITIES OF GERMANTOWN, DAMASCUS, AND LISBON  
343 AM EDT FRI JUL 21 2017  
   
..HEAT ADVISORY IS CANCELLED
 
 
THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS  
CANCELLED THE HEAT ADVISORY.  
 
THESE HIGHER ELEVATION ZONES ARE NOT EXPECTED TO REACH A HEAT  
INDEX OF 105 DEGREES TODAY.  
 

 
 
DCZ001-MDZ011-013-014-016>018-504-506-508-VAZ037>039-050>057-502-  
506-211545-  
/O.CON.KLWX.HT.Y.0005.170721T1400Z-170722T0000Z/  
DISTRICT OF COLUMBIA-SOUTHERN BALTIMORE-PRINCE GEORGES-  
ANNE ARUNDEL-CHARLES-ST. MARYS-CALVERT-  
CENTRAL AND SOUTHEAST MONTGOMERY-CENTRAL AND SOUTHEAST HOWARD-  
SOUTHEAST HARFORD-ALBEMARLE-GREENE-MADISON-ORANGE-CULPEPER-  
PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-  
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-  
KING GEORGE-SOUTHERN FAUQUIER-EASTERN LOUDOUN-  
INCLUDING THE CITIES OF WASHINGTON, BALTIMORE, BOWIE,  
SUITLAND-SILVER HILL, CLINTON, COLLEGE PARK, GREENBELT, LAUREL,  
CAMP SPRINGS, GLEN BURNIE, ANNAPOLIS, SEVERN, SOUTH GATE,  
SEVERNA PARK, ARNOLD, ODENTON, ST. CHARLES, WALDORF,  
LEXINGTON PARK, CALIFORNIA, CHESAPEAKE BEACH, HUNTINGTOWN,  
DUNKIRK, NORTH BEACH, LUSBY, PRINCE FREDERICK, BETHESDA,  
ROCKVILLE, GAITHERSBURG, SILVER SPRING, COLUMBIA, ELLICOTT CITY,  
ABERDEEN, CHARLOTTESVILLE, STANARDSVILLE, MADISON, ORANGE,  
GORDONSVILLE, CULPEPER, DALE CITY, MANASSAS, WOODBRIDGE,  
LAKE RIDGE, MONTCLAIR, RESTON, HERNDON, ANNANDALE, CENTREVILLE,  
CHANTILLY, MCLEAN, FRANCONIA, ARLINGTON, ALEXANDRIA, FALMOUTH,  
FREDERICKSBURG, DAHLGREN, TURNBULL, LEESBURG, ASHBURN,  
AND STERLING  
343 AM EDT FRI JUL 21 2017  
 
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO  
8 PM EDT THIS EVENING...  
 
* HEAT INDEX VALUES...UP TO 107 DEGREES WITH MAXIMUM TEMPERATURES  
IN THE MID TO UPPER 90S, AND DEWPOINTS IN THE LOWER 70S.  
 
* IMPACTS...THE HEAT AND HUMIDITY MAY CAUSE HEAT STRESS DURING  
OUTDOOR EXERTION OR EXTENDED EXPOSURE.  
 
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.  
 

 
 

 
 
JACKSON  
 
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