943  
FXUS64 KHGX 202037  
AFDHGX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX  
337 PM CDT MON AUG 20 2018  
   
DISCUSSION
 
 
A HEAT ADVISORY HAS BEEN ISSUED FOR THE SOUTHERN HALF OF THE AREA  
THIS AFTERNOON FOR HEAT INDICES RANGING FROM 106 TO 110 DEGREES.  
A FEW THUNDERSTORMS HAVE DEVELOPED ACROSS THE HOUSTON METRO AREA  
ALONG THE SEA BREEZE/BAY BREEZE THIS AFTERNOON BUT SHOULD  
DISSIPATE SHORTLY AFTER SUNSET. A LINE OF SHOWERS AND  
THUNDERSTORMS IS BEGINNING TO DEVELOP JUST TO THE NORTH OF THE  
AREA AHEAD OF A COLD FRONT. THESE SHOWERS AND THUNDERSTORMS WILL  
PUSH INTO THE NORTHERN ZONES OVER THE NEXT HOUR OR SO BEFORE  
EVENTUALLY DYING OFF AFTER SUNSET. SOME OF THESE STORMS COULD  
PRODUCE LOCALLY HEAVY DOWNPOURS AND GUSTY WINDS.  
 
THE WEAK COLD FRONT SAGGING INTO THE AREA COULD SERVE AS A FOCUS  
FOR SHOWER AND THUNDERSTORM DEVELOPMENT AGAIN TOMORROW,  
PARTICULARLY AS IT COLLIDES WITH THE SEA BREEZE. HOWEVER,  
COVERAGE IS EXPECTED TO BE LESS THAN TODAY AS ANY CONVECTION WILL  
HAVE TO FIGHT SOME SUBSIDENCE DUE TO UPPER RIDGING ALREADY  
BUILDING IN BEHIND THE EJECTING UPPER LOW.  
 
HOTTER AND DRIER CONDITIONS ARE EXPECTED IN THE WAKE OF THE FRONT  
WITH A LARGE PORTION OF THE AREA FORECAST TO NEAR 100 DEGREES ON  
WEDNESDAY. FORTUNATELY, DEW POINTS ARE EXPECTED TO DROP INTO THE  
LOW 60S TO LOW 70S WHICH SHOULD HELP KEEP HEAT INDICES IN THE  
100-106 DEGREE RANGE.  
 
RAIN CHANCES MAY CREEP UP HEADING INTO THE WEEKEND AS THE RIDGE  
SLIDES NORTHWARD A BIT. HIGH TEMPERATURES NUDGE BACK DOWN A FEW  
DEGREES BUT MOISTURE RETURNS, KEEPING HEAT INDICES IN THAT 101-107  
DEGREE RANGE.  
 
11  
 

 
   
MARINE
 
 
AS A WEAK COOL FRONT DESCENDS INTO EASTERN TEXAS THROUGH TUESDAY,  
THE MARITIME PRESSURE GRADIENT WILL RELAX GOING INTO MID WEEK. THIS  
WEAKER REGIONAL GRADIENT WILL MAINTAIN A PRIMARILY LIGHT WEST TO  
SOUTHWESTERLY WIND FIELD THROUGH EARLY WEDNESDAY. THIS SURFACE  
BOUNDARY MAY REACH THE NEARSHORE WATERS BY WEDNESDAY AFTERNOON AND  
BRIEFLY SWING LIGHT WINDS MORE NORTH OF WEST. LOW END RAIN AND STORM  
CHANCES TUESDAY AND WEDNESDAY IN RELATION TO THIS VICINITY BOUNDARY.  
SEA HEIGHTS WILL GENERALLY RANGE BETWEEN 1 NEAR 3 FEET THROUGH THE  
REMAINDER OF THE WEEK. 31  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
COLLEGE STATION (CLL) 98 77 98 75 101 / 40 30 20 10 10  
HOUSTON (IAH) 96 79 97 77 100 / 20 30 30 10 10  
GALVESTON (GLS) 92 82 93 81 94 / 20 10 20 20 20  
 

 
   
HGX WATCHES/WARNINGS/ADVISORIES
 
 
TX...HEAT ADVISORY UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING  
ZONES: BRAZORIA ISLANDS...CHAMBERS...COASTAL BRAZORIA...  
COASTAL GALVESTON...COASTAL HARRIS...COASTAL JACKSON...  
COASTAL MATAGORDA...FORT BEND...GALVESTON ISLAND AND  
BOLIVAR PENINSULA...INLAND BRAZORIA...INLAND GALVESTON...  
INLAND HARRIS...INLAND JACKSON...INLAND MATAGORDA...  
MATAGORDA ISLANDS...NORTHERN LIBERTY...SOUTHERN LIBERTY...  
WHARTON.  
 
GM...NONE.  

 
 

 
 
DISCUSSION...11  
AVIATION/MARINE...31  
 
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