A storm complex moved across Galveston County causing havoc in the Santa Fe area where 7 to 9” caused flooding. Ironically, rainfall amounts were quite varied even across small areas as the storms tended to move slowly across the same locales. As a result, precipitation totals at official reporting sites varied from only 0.51” at Scholes Field in Galveston to 4.06” at the NWS Office in League City/Dickinson. Reports from volunteer observers ranged from 3.50” just northwest of Friendswood to less than an inch over some parts of La Marque and League City.
The storms were a result of a weak upper-level low, combined with a stream of deep Gulf moisture and daytime heating. This generated what is known as a MCV (mesoscale convective vortex) or thunderstorm complex with a low pressure center that is capable of producing prodigious amounts of rain.
Unfortunately, the lingering upper-level low has produced more thundershowers this morning with the bulk of the rain falling over the area most drenched by yesterday’s downpours.
High pressure, however, should build in from the west by tomorrow bringing us a day or two of dry, warm weather. Some rain can’t be ruled this weekend as a cold front moves in, but amounts should be light compared to Tuesday. The good news is that there will be enough cool air behind the front to drop overnight temperatures into the 50’s and bring less humid conditions by Sunday and Monday.
Looking further ahead, the Climate Prediction Center still is calling for slightly wetter than normal weather though early May. Given the recent rains, I wouldn’t rule out that possibility just yet!