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re: Tornado! Bama - State of Emergency - High Risk Portions of GA & SC

Posted on 4/5/17 at 10:32 am to
Posted by rds dc
Member since Jun 2008
19824 posts
Posted on 4/5/17 at 10:32 am to
quote:

What does that mean RDS?


quote:


DISCUSSION...GPS PW data are exhibiting a low bias by at least 0.5 
inch from parts of AL into GA, which has influenced initialization 
of the latest numerical weather prediction guidance.


GPS data is put through radio occulation to measure the Doppler shift in the GPS data to determine atmospheric moisture content. Simple version, they can us GPS data to tell models how much water is in the air. That isn't working properly today and it is f'ing up the models.
Posted by TU Rob
Birmingham
Member since Nov 2008
12762 posts
Posted on 4/5/17 at 10:42 am to
What usually happens in Alabama, at least around Birmingham, is one of the larger school systems cancels, and the rest follow suit. My wife worked for Jefcoed and they have schools scattered all over the county, so they can’t just say “Schools XYZ” is cancelled today, but the rest of you teachers and students have to show up. So they cancel or call school early, and then you’ll have Hoover, Vestavia, Homewood etc all start cancelling as well. I think it was actually Hoover that called it first with today’s forecast. It was supposed to hit pretty hard between 3-5 AM, and it sort of did, just without any tornado activity. I still had to work, but my drive in this morning around 7:30 was pretty hairy. Some areas a light drizzle, others a torrential downpour. You don’t want kids on busses during all that, combined with the normal carpool traffic of parents dropping off, and especially inexperienced teenage drivers at high schools.
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