Thunderstorms rumbled across Galveston County on Thursday and night, bringing up to 3 inches of rain to some areas along the Bay and the extreme northwest part of the County. By late evening, outflow boundaries set off additional storms closer to the coast bringing precipitation totals there ranging from a little over 1/3 to nearly 1 ½ inches. More rounds of thunderstorm activity are expected for at least the next 2-3 days.

Daily Precipitation

The storms are part of a slowly developing pattern of deep tropical moisture, a mostly stationary frontal boundary over Southeast Texas and an upper-level low pressure trough creeping eastward across the region.

36-Hour Precipitable Water
Current upper-level map showing upper-level trough and developing low over Texas

Current upper-level map showing upper-level trough and developing low over Texas

So far, the heaviest rains with this slow-moving system have been in a band from near Corpus Christi to Matagorda County where flash flooding will be possible with any additional rainfall.

RAP32 Boundary Layer

As for Galveston County, the prospects for additional precipitation today and through the weekend remain somewhat elevated with a marginal risk for excessive rains lingering into Sunday.

SPC Thunderstorm Outlook
Day 2 Excessive Rainfall Outlook

As for the longer-term outlook, high pressure building in late next week should result in a return to more typical June weather with isolated to widely scattered thundershowers in the afternoon hours. Unfortunately, the subsequent decrease in clouds will result in warmer temperatures with afternoon highs in the mid to upper-80’s.

Stan Blazyk is a life-long weather enthusiast, long-time Galveston resident and author of "A Century of Galveston Weather." He has written about weather for The Daily News for more than a decade.

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