338  
WWUS73 KDMX 210912  
NPWDMX  
 
URGENT - WEATHER MESSAGE  
NATIONAL WEATHER SERVICE DES MOINES IA  
412 AM CDT FRI JUL 21 2017  
   
..EXCESSIVE HEAT WILL PERSIST THROUGH SATURDAY
 
 
.ANOTHER EXTREMELY HOT AND HUMID DAY WILL OCCUR TODAY WITH HIGH  
TEMPERATURES APPROACHING 100 DEGREES AGAIN OVER THE SOUTHERN HALF  
OF THE STATE AND HEAT INDICIES EXCEEDING 110 AT TIMES. SATURDAY  
WILL BE A BIT COOLER, ESPECIALLY OVER NORTHERN IOWA. THE HEAT  
HEADLINES MAY BE ABLE TO BE CANCELLED ACROSS THE NORTH SATURDAY AS  
A COLD FRONT PASSES THROUGH THAT PORTION OF THE STATE. HOT  
CONDITIONS WILL PERSIST ACROSS THE SOUTH SATURDAY.  
 
IAZ057>062-070>075-081>086-092>097-211715-  
/O.CON.KDMX.EH.W.0001.000000T0000Z-170723T0100Z/  
AUDUBON-GUTHRIE-DALLAS-POLK-JASPER-POWESHIEK-CASS-ADAIR-MADISON-  
WARREN-MARION-MAHASKA-ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-  
TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS-  
INCLUDING THE CITIES OF AUDUBON, EXIRA, GUTHRIE CENTER, PANORA,  
BAYARD, CASEY, PERRY, WAUKEE, ADEL, DES MOINES, NEWTON, GRINNELL,  
ATLANTIC, GREENFIELD, STUART, ADAIR, FONTANELLE, WINTERSET,  
EARLHAM, INDIANOLA, NORWALK, CARLISLE, PELLA, KNOXVILLE,  
OSKALOOSA, CORNING, CRESTON, OSCEOLA, CHARITON, ALBIA, OTTUMWA,  
BEDFORD, LENOX, NEW MARKET, MOUNT AYR, LAMONI, LEON, CORYDON,  
SEYMOUR, ALLERTON, HUMESTON, CENTERVILLE, AND BLOOMFIELD  
412 AM CDT FRI JUL 21 2017  
 
...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT  
SATURDAY...  
 
* TEMPERATURE...HIGH TEMPERATURES OF 95 TO 100 DEGREES AND  
DEWPOINTS IN THE LOW TO MID 70S WILL CREATE HEAT INDEX VALUES OF  
105 TO 115 THIS AFTERNOON. CONDITIONS TONIGHT WILL REMAIN WARM  
AND HUMID WITH LOWS IN 75 TO 80 RANGE. TEMPERATURES WILL BE  
SLIGHTLY COOLER ON SATURDAY, HOWEVER, EXPECT HEAT INDICIES BACK  
IN THE 100 TO 110 RANGE.  
 
* IMPACTS...PROLONGED EXPOSURE TO HEAT AND HUMIDITY MAY LEAD TO  
HEAT-RELATED ILLNESS IF PRECAUTIONS ARE NOT TAKEN.  
 
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.  
 
YOUNG CHILDREN AND PETS SHOULD NEVER BE LEFT UNATTENDED IN  
VEHICLES UNDER ANY CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING  
WARM OR HOT WEATHER WHEN CAR INTERIORS CAN REACH LETHAL  
TEMPERATURES IN A MATTER OF MINUTES.  
 

 
 

 
 
IAZ023-024-033>037-044>050-211715-  
/O.CON.KDMX.HT.Y.0003.000000T0000Z-170723T0100Z/  
POCAHONTAS-HUMBOLDT-SAC-CALHOUN-WEBSTER-HAMILTON-HARDIN-CRAWFORD-  
CARROLL-GREENE-BOONE-STORY-MARSHALL-TAMA-  
INCLUDING THE CITIES OF POCAHONTAS, LAURENS, ROLFE, FONDA,  
GILMORE CITY, HUMBOLDT, SAC CITY, LAKE VIEW, ODEBOLT, WALL LAKE,  
SCHALLER, EARLY, ROCKWELL CITY, MANSON, LAKE CITY, POMEROY,  
FORT DODGE, WEBSTER CITY, IOWA FALLS, ELDORA, ACKLEY, DENISON,  
CARROLL, JEFFERSON, BOONE, AMES, MARSHALLTOWN, TAMA, TOLEDO,  
TRAER, DYSART, AND GLADBROOK  
412 AM CDT FRI JUL 21 2017  
   
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT SATURDAY
 
 
* TEMPERATURE...HIGH TEMPERATURES IN THE 90S AND DEW POINTS IN THE  
LOW TO MID 70S WILL CREATE HEAT INDEX VALUES OF 100 TO 110 THIS  
AFTERNOON. SATURDAY WILL BE COOLER NORTH OF HIGHWAY 30. HEAT  
HEADLINES MAY BE CANCELLED ACROSS THAT PORTION OF THE ADVISORY  
AREA FOR SATURDAY. FARTHER SOUTH EXPECT HEAT INDICIES BACK ABOVE  
100 DEGREES BY SATURDAY AFTERNOON.  
 
* IMPACTS...PROLONGED EXPOSURE TO HEAT AND HUMIDITY MAY LEAD TO  
HEAT-RELATED ILLNESS IF PRECAUTIONS ARE NOT TAKEN.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES IS  
EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY  
WILL COMBINE TO CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE  
POSSIBLE. DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED  
ROOM, STAY OUT OF THE SUN, AND CHECK UP ON RELATIVES AND  
NEIGHBORS.  
 
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.  
 

 
 

 
 
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