Re: Did Harvey have "More Moisture" than other storms?
Posted by
Chris in Tampa on 8/28/2017, 6:07 pm
I think it is primarily due to stalling. If this had moved like a normal storm, the rain totals would have been dramatically less. However, I have seen mention of the precipitable water value being high:
From:
https://canetalk.com/2017/08/1503748692.shtml
Here was Jim Cantore's response to that:
Wikipedia:
https://en.wikipedia.org/wiki/Precipitable_water
"Precipitable water is the depth of water in a column of the atmosphere, if all the water in that column were precipitated as rain."
More technical definition:
http://glossary.ametsoc.org/wiki/Precipitable_water
I don't know how this compares to other storms. I don't know where values like that could be compared. Maybe a tropical cyclone report has soundings with that information? But I don't know how to compare to other storms.
I don't see anything about that in Allison's particular Tropical Cyclone Report (TCR):
http://www.nhc.noaa.gov/data/tcr/AL012001_Allison.pdf
It only seems to talk about dry air after it dropped most of the rainfall, later when it moved back into Gulf. Actually, Harvey is getting some dry air into it, so in that regard it is similar.
Wikipedia article on Allison:
https://en.wikipedia.org/wiki/Tropical_Storm_Allison
I think most of it is just not moving and being close to the Gulf still. If it had been further inland, more cutoff from the Gulf, we would have seen less rain. But perhaps the precipitable water is also a little higher in this storm too, even if it is not the main factor in the rain.
I don't know much about it, but I would think being close to the Gulf is a big reason. If precipitable water around 3 inches is high, where did 40 inches of rain come from? I assume because of access to the Gulf. |
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