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Carolus Jcl's avatar

Regarding central Texas weather, geology and soils: yes the Hill Country and it surrounding environs offer a very unusual, and unpredictable set of circumstances regarding weather, climate and geographic location near both the Gulf of Mexico and the monsoon belt of southwestern USA. Matt Lanza, Houston meteorologist and substack contributor offered an early explanation of some of the contributing factors regarding the central Texas flooding and unusual rainfall events.

However, potentially catastrophic rainfall events are not that unusual for this region as borne out by a gander of the records for some of the highest rainfall events occuring over the course of an hour to 48 hours in North America.. Texas is very well represented in the statistics.

The hill country rivers are famous for white water canoeing due partially the sloping terrain, but also from a strong, steady baseflow from the underlining limestone. Another surprising characteristic of these rivers concerns flood response times when a given watershed is completely inundated by large scale precipitation events. The response time of water being delivered to the flood channel; no matter how far away, or at what elevation it fell is one of the shortest, fastest respones certainly seen anywhere in rhe US, and is the subject of many interesting papers in USGS academic literature since at least 1970.

A combination all of these factors has contributed a rich flood history of catastrophic floods historically in central Texas as far back as you care to research, whether its the Nueces, Guadalupe, San Antonio, Colorado Rivers or others.

As populations increase, it places more people at risk who are unaware of these unique factors as they recreate in this beautiful region. I grew up there in the 1950s-60s. It is clearly time to address these immense tragedies that periodically unfold with regularity; and they are not as predictable as some would have us believe.

As for for GW, a warmer atmosphere will always be able to entrain more moisture aloft, and the increase of ctastrophic rainfall is evidence of this. In the case of this July 4th event, the instigation arose from a tropical depression out of Mexico.

Attribution of CC as a contributing factor will take statistical analysis after the fact. It is time to act, and also to rescind the cuts to weather research and NOAA.

Further, a flood warning system tied to 'river flood gauges' is long overdue. How will the cost of resources consumed by this event compare to a warning system. 60 - 80 lives is worth starting now. Further consideration should be givwn to zoning and planning regs as well.

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Charlotte Wilson's avatar

Hearing this morning the story of family friends who were in the RV park next to the Howdy Restaurant. Of the couple, one is in hospital and one still missing. They woke because the RV was moving. Water already inside. Husband kicked the door open and was swept away. Wife went out after him and was plucked from a tree by someone in a boat. They heard no warnings whatsoever, BUT she makes the point that her husband takes out his hearing aids at night AND they have the air conditioning running full tilt which masks many sounds. Don't know about cell phone alerts but most people I know place phones on do not disturb at night. Also the emergency cell phone notifications are so ubiquitous -- silver alerts from 600 miles away, amber alerts ditto etc -- that I for one have silenced them.

Local authorities are only too happy to take the economic benefits from tourism, the least they can do, in a known danger zone, is install a working alert system.

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