South Texas Weather Forecast
Weather forecast for April 28, 2016
April 28 – 30, 2017
Daily Weather Forecast
South Texas Weather Modification Association

Weather Discussion:
Mostly cloudy across south TX this morning, with widespread fog across the region.  Fog looks
to last through the early to mid morning hours.  Mostly cloudy skies this morning will gradually
give way to partly cloudy skies by midday.  High temperatures in the lower to mid 90’s with
warmer temps along the Rio Grande plains.  High heat index values are likely this afternoon and
evening.  Partly then mostly cloudy overnight with possible fog.  Low temps in the lower to mid 70’
s.

Mostly cloudy Saturday morning with clouds slowly dissipating to becoming partly cloudy in the
afternoon.  A strong trough of low pressure looks to move through the Southwest US, with a
strong cold front slowing moving south through TX.  Isolated to scattered showers and
thunderstorms are possible in the late afternoon Saturday.  A few storms could be severe with
large hail, damaging winds, and localized flooding.  Saturday high temps in the mid to upper 80’s
with warmer temps across extreme south TX.  The strong cold front looks to push through the
region overnight Saturday with scattered to widespread showers and thunderstorms, with severe
weather possible.  Large hail, damaging winds, and localized flooding are possible overnight
Saturday into early Sunday morning as the storms move from northwest to southeast across the
region.  Saturday lows in the upper 50’s, lower 60’s.  Depending on the speed of the system,
scattered showers and storms could still be possible through the late morning hours, mainly east
of San Antonio.  Otherwise mostly sunny on Sunday with breezy conditions as high pressure
moves into the region.  Sunday highs in the mid to upper 70’s.  Mostly sunny both Monday and
Tuesday.

Daily normal (F): high 83, low 62

Pilots (STWMA): no cloud seeding today.  

Today: Mostly cloudy in the morning with widespread fog.  Fog looks to last through the early to
mid morning hours.  Partly cloudy in the afternoon.  High temps in the lower to mid 90’s with
warmer temps along the Rio Grande plains.  High heat index values are likely in the afternoon
and evening.  Southeasterly winds 5 – 15 mph.

Tonight: Partly then mostly cloudy with patchy fog.  Low temps in the lower to mid 70’s.  
Southeasterly winds 5 – 15 mph.

Saturday: Mostly cloudy in the morning, then partly cloudy in the afternoon.  Isolated to
scattered showers and thunderstorms possible in the late afternoon Saturday.  Some storms
could be severe.  Highs in the mid to upper 80’s with warmer temps across extreme south TX.  
Mostly cloudy overnight with scattered to widespread showers and thunderstorms.  Severe
weather is possible overnight.  Large hail, damaging winds, and localized flooding are the main
threats.  Overnight low temps in the upper 50’s, lower 60’s.  Southeasterly winds 5 – 15 mph,
then northwesterly at 10 – 20 mph after the front passes in the overnight hours.

Sunday: Mostly cloudy with scattered showers and thunderstorms east of San Antonio in the
morning, with clearing skies to the west.  Mostly sunny in the afternoon.  Breezy.  High temps in
the mid to upper 70’s.  Mostly clear overnight.  Overnight lows in the lower to mid 50’s, with
cooler temps over hill country.  Northwesterly winds 10 – 20 mph and decreasing throughout the
day.

Extended: Mostly sunny both Monday and Tuesday (May 2).


Forecast Notes:
Temperatures are in Fahrenheit (F)
Wind speeds are in miles per hour (mph)
Rainfall amounts in inches (in.)
Visibility in miles

Rain chance terminology from lowest to highest chance: isolated, scattered, widespread.
South Texas Weather Modification Association