024  
FXUS64 KBRO 221937  
AFDBRO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BROWNSVILLE TX  
237 PM CDT FRI JUN 22 2018  
 
.SHORT TERM (NOW THROUGH SATURDAY NIGHT): BROWNSVILLE RADAR  
CURRENTLY SHOWS SOME ISOLATED ACTIVITY, MAINLY SOUTH OF THE RIO  
GRANDE RIVER. A FEW ISOLATED SHOWERS AND THUNDERSTORMS ARE  
POSSIBLE THROUGH THIS AFTERNOON DUE TO DAYTIME HEATING AND AMPLE  
LOW LEVEL MOISTURE. HIGH DEWPOINTS IN THE MID TO UPPER 70S ARE  
PRODUCING HEAT INDEX VALUES IN THE 105-110 DEGREES RANGE ACROSS  
MUCH OF THE AREA THIS AFTERNOON. RAIN-FREE CONDITIONS SHOULD  
FINALLY RETURN TO DEEP SOUTH TEXAS TONIGHT THROUGH SATURDAY NIGHT  
AS 500 MB RIDGING BUILDS EAST OVER THE TEXAS. WARMING TEMPERATURES  
ARE ALSO ANTICIPATED AS THE MID-LEVEL HIGH BECOMES THE MAIN  
WEATHER FEATURE. HEAT INDEX VALUES SATURDAY AFTERNOON ARE EXPECTED  
TO BE BETWEEN 105-110 DEGREES AGAIN ACROSS MUCH OF THE AREA. A  
PAIR OF AREAL FLOOD WARNINGS REMAIN IN EFFECT FOR PORTIONS OF  
HIDALGO AND CAMERON COUNTIES DUE TO EXISTING FLOODWATERS LEFTOVER  
FROM RECENT HEAVY SHOWERS AND THUNDERSTORMS.  
 
.LONG TERM (SUNDAY THROUGH FRIDAY): THE PERIOD STARS OFF WITH A  
MID LEVEL INVERTED TROUGH OVER THE FORECAST AREA WITH THE TROUGH  
SLATED TO SLOWLY FILL AS IT MOVES SLOWLY EASTWARD. INCREASED  
MOISTURE BROUGHT INTO DEEP SOUTH TEXAS WITH THE TROUGH WILL CAUSE  
LOW CHANCES OF SHOWERS AND THUNDERSTORMS TO RE-ENTER THE FORECAST  
SUNDAY NIGHT THROUGH TUESDAY NIGHT. HIGH TEMPERATURES SUNDAY  
AFTERNOON WILL BE NEAR SEASONAL NORMALS AND RANGE FROM THE LOWER  
90S AT THE COAST WITH MID 90S TO AROUND 101 OVER THE INLAND  
LOCATIONS. INCREASED MOISTURE ACROSS THE RIO GRANDE VALLEY WILL  
BRING SOMEWHAT LOWER HIGHS MONDAY AND TUESDAY. THESE WILL RANGE  
FROM 90 TO 93 AT THE COAST WITH MID/UPPER 90S INLAND.  
 
ON WEDNESDAY, THE TROUGH MOVES OFF TO THE WEST AND HIGH PRESSURE  
REBUILDS ALOFT OVER DEEP SOUTH TEXAS FROM THE NORTHERN GULF. THIS  
HIGH PRESSURE WILL PREVAIL THROUGH FRIDAY BRINGING PRECIPITATION-  
FREE BUT HOT AND HUMID CONDITIONS. NOT ANTICIPATING MUCH CHANGE IN  
HIGH TEMPERATURES WED-FRI THAN THOSE ON TAP FOR MON-TUE.  
 

 
 
.MARINE (NOW THROUGH SATURDAY NIGHT): BUOY 42019 REPORTED SOUTH  
WINDS AROUND 9 KNOTS WITH SEAS SLIGHTLY OVER 2.6 FEET WITH A  
PERIOD OF 7 SECONDS AT 150 CDT/1850 UTC. GENERALLY MODERATE WINDS  
AND SEAS WILL PREVAIL ALONG THE LOWER TEXAS COAST WITH SURFACE  
HIGH PRESSURE IN CONTROL ACROSS THE WESTERN GULF OF MEXICO. SMALL  
CRAFT EXERCISE CAUTION IS POSSIBLE FOR GULF OF MEXICO WATERS ON  
SATURDAY AS SEAS BUILD AND WINDS INCREASE SLIGHTLY.  
 
SUNDAY THROUGH TUESDAY: ELEVATED WINDS/SEAS WILL BRING EITHER  
SMALL CRAFT SHOULD EXERCISE CAUTION HEADLINES OR LOW END SMALL  
CRAFT ADVISORIES THROUGH THE PERIOD.  
 

 
   
BRO WATCHES/WARNINGS/ADVISORIES
 
 
TX...NONE.  
GM...NONE.  

 
 

 
 
THIS PRODUCT IS ALSO AVAILABLE ON THE WEB AT:  
HTTP://WEATHER.GOV/RGV  
 
63/19  
 
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