Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
1210 PM EDT Wed Sep 18 2019
Day 1
Valid 16Z Wed Sep 18 2019 - 12Z Thu Sep 19 2019
...A HIGH RISK OF EXCESSIVE RAINFALL EXISTS FOR PORTIONS OF THE
UPPER TEXAS COAST...
...East TX/Southwest LA...
1600 UTC Update -- Shifted the High Risk area a little farther to
the east, while extending the eastern periphery of the Moderate
eastward as well, based on the 12Z guidance/trends (including
high-res CAMs). Still a bit concerned with the strongest
instability offshore; however, some of those outer inflow bands
are drawing 2000-3000 j/kg of mixed CAPE, which earlier had led to
hourly rainfall rates of 2.5-3.0+ inches along portions of the
Upper Texas Coast. Currently, the CDO continues to result in a
relative min in instability toward Imelda's center (thus lower
short term rainfall rates). However, as the TD lifts slowly
northward, so will those outer inflow bands.
