Update on storms expected Tuesday night and Wednesday

After taking a look at some the latest model guidance here’s an updated look at what to expect on Tuesday and Wednesday, which likely will be the worst times for storm activity in the greater Houston metro area.

TUESDAY

Right now I anticipate light to moderate rainfall on Tuesday afternoon, with most areas seeing between 0 and 1 inch of rain. There should not be too much trouble with the commute home on Tuesday evening. At some point between 6 p.m. and midnight we’ll see an increase in rain showers. Here’s why:

A low-pressure system will act like a vacuum cleaner to draw exceptionally high levels of moisture (seen here in precipitable water standard deviations) into Texas, Louisiana and Arkansas. (Weather Bell)
A low-pressure system will act like a vacuum cleaner to draw exceptionally high levels of moisture (seen here in precipitable water standard deviations) into Texas, Louisiana and Arkansas, and points further north. (Weather Bell)

The bottom line is that the Houston area will see near record moisture levels beginning Tuesday evening. I still think the heaviest rain will come between just before midnight on Tuesday night, running through at least the mid-morning hours on Wednesday. Some models are suggesting a few parts of the region could see as much as 4 to 8 inches of rain during this time frame, with lesser amounts for widespread areas. At this time I do not see these rain storms matching the intensity of the Memorial Day rain event in Houston, but with these kinds of moisture levels we can’t be certain of that.

GFS model forecast for rain accumulation from now through Thursday. (Weather Bell)
GFS model forecast for rain accumulation from now through Thursday. (Weather Bell)

 

The other concern is the potential for damaging winds and even tornadoes. However it looks like the most favorable conditions for this severe weather will be to the west of Houston. I continue to believe our biggest threat will come from heavy rains.

WEDNESDAY

By the middle of Wednesday some of the forecast models show a worked over atmosphere beginning to dry out, but the European model keeps the rain train going through Thursday morning. This is something we’ll have to watch closely because of the potential for flooding once Tuesday night’s rains soak the ground.

Matt and I will continue to remain on top of this.

Posted at 1:15 pm CT on Monday.

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