Aug 28, 2014 4:47 PM by Rob Perillo
A surge of deep tropical moisture is on the way for Acadiana with high rain chances likely to develop area-wide by Saturday.
High tropical moisture content in the Gulf of Mexico was located near the lower Texas Coast Thursday afternoon with a tropical wave and weak area of low pressure near Brownsville, Texas.
Another tropical wave entered the Gulf from the southeast by the Yucatan Thursday and this moisture will likely get drawn northward to the Gulf Coast through Saturday as an upper level trough moves eastward across the Central U.S.
This will bring the deepest moisture into Acadiana beginning late Friday with highest values likely Saturday.
There should be enough instability aloft to trigger widespread showers and storms toward Saturday morning with locally heavy rainfall of 1-3" likely by Saturday afternoon.
And per the KATC RPM Futurecast Model, there may be some isolated spots that see upwards of 5" of accumulated rainfall through the weekend, especially across the coastal parishes and to the south and west toward the Upper Texas Coast.
Rainfall totals however, could be markedly lower farther northern into Central Louisiana through the weekend.
The risk of tropical showers and a few storms will increase late Friday afternoon into early Friday evening with some rain chances possible overnight into Saturday.
Highest rain chances will likely arrive for Acadiana Saturday (70-90%) with lower numbers, (probably closer to 40-50%) Sunday.
Next week (including Labor Day) looks to bring more "typical" summer weather with rain chances closer to 30-40% along with highs getting back well into the lower-mid 90s.
RPM Precipitation Accumulation through Saturday Afternoon: