493  
WWUS74 KBRO 200858  
NPWBRO  
 
URGENT - WEATHER MESSAGE  
NATIONAL WEATHER SERVICE BROWNSVILLE TX  
358 AM CDT FRI JUL 20 2018  
 
...DANGEROUS HEAT INDICES EXPECTED ACROSS SOUTHERN HIDALGO COUNTY  
THIS AFTERNOON...  
 
.STABLE HIGH PRESSURE SPREADING ACROSS TEXAS WILL MAINTAIN ANOTHER  
DAY OF HIGH HEAT ACROSS THE RIO GRANDE VALLEY AND DEEP SOUTH  
TEXAS TODAY. THE EXCESSIVE HEAT WILL COMBINE WITH INCREASED  
SURFACE HUMIDITY TO BRING HEAT INDEX VALUES TO POTENTIALLY  
DANGEROUS LEVELS THIS AFTERNOON ACROSS SOUTHERN HIDALGO COUNTY.  
 
TXZ253-202300-  
/O.NEW.KBRO.HT.Y.0002.180720T1800Z-180720T2300Z/  
SOUTHERN HIDALGO-  
INCLUDING THE CITIES OF MCALLEN, EDINBURG, PHARR, MISSION,  
AND WESLACO  
358 AM CDT FRI JUL 20 2018  
 
...HEAT ADVISORY IN EFFECT FROM 1 PM THIS AFTERNOON TO 6 PM CDT  
THIS EVENING...  
 
THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A HEAT  
ADVISORY, WHICH IS IN EFFECT FROM 1 PM THIS AFTERNOON TO 6 PM CDT  
THIS EVENING.  
 
* TEMPERATURE...HIGH TEMPERATURES CLIMBING INTO THE 102 TO 104  
DEGREE RANGE BY LATE THIS AFTERNOON.  
 
* HEAT INDEX...RISING TO BETWEEN 110 AND 113 DEGREES BY 3 PM AND  
CONTINUING UNTIL 6 PM.  
 
* IMPACTS...PERSONS SPENDING TIME OUTSIDE TODAY ARE URGED TO  
HYDRATE CONTINUOUSLY BEFORE, DURING, AND AFTER OUTDOOR WORK OR  
ACTIVITY. TAKE FREQUENT BREAKS IN SHADY AREAS IN ORDER TO KEEP  
COOL. THOSE WHO DO NOT FOLLOW HEAT SAFETY TIPS WILL BE  
SUSCEPTIBLE TO HEAT EXHAUSTION OR HEAT STROKE DUE TO  
DEHYDRATION.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A HEAT ADVISORY IS ISSUED WHEN THE HEAT INDEX...A MEASURE OF HOW  
IT FEELS WHEN TEMPERATURE AND HUMIDITY ARE COMBINED...EQUALS OR  
EXCEEDS 111 DEGREES FOR 2 HOURS OR MORE DURING THE DAY.  
 

 
 

 
 
SPEECE  
 
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