3/19 – Payton’s Monday Evening Forecast

The cold front over northeast to southwest Louisiana will continue to
push fairly quickly east through most of the forecast area the
remainder of this afternoon and this evening and through the
coastal waters overnight. Drier air has already filtered into the
forecast area ahead of the cold front, and this has capped off and
inhibited most of the convective development today. There is still
a slight chance of a stray shower and possibly a thunderstorm over
eastern areas through just before sunset in advance of the cold
front, but most locations should remain dry. The cooler and drier
air will surge in very noticeably tonight as surface high
pressure builds from the plains into the Mississippi Valley and an
upper level trough slides east towards the eastern seaboard. This
will lead to very pleasant conditions under clear skies despite
being below normal for temperatures Tuesday into Wednesday. Very
low humidity values down around 25 percent are expected during
peak heating on Wednesday, so naturally this will support some
cooler low temperatures in the low to mid 40s for the south
Mississippi Tuesday and Wednesday nights.

Northwest flow aloft and surface high pressure will keep the
forecast area dry on Thursday with moderating high temperatures
returning closer to the seasonal normals. Upper level troughs on
both the west and east coast regions will be gradually sliding
east which will allow the shortwave ridge to move over and east of
the forecast area Friday night through Saturday night. Southwest
flow will become more active in the southern stream out of Mexico
and Texas, so the next initial weak shortwave trough may bring our
next chance of showers about Monday, but it appears it should
be dry and warm this weekend.

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