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3/11-3/12 Winter Storm


BornAgain13

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RAH finished their afternoon AFD.

This lead front will settle to the Gulf coast through Sat night,
while a separate frontal zone --along the leading edge of arctic
high pressure initially centered over the nrn Plains and Upper
Midwest-- develops NEwd along/west of the srn Appalachians. As is
often times the case, the models are likely too aggressive to bring
that air mass Swd, in backdoor/damming fashion, through central NC
Sat night. However, the sub-cloud and boundary layer will have
already dried appreciably behind the lead front, such that surface
dewpoints will likely be in the teens at the time precipitation
streams E into the Piedmont early Sat night. As such, diabatic
cooling should prove sufficient to cool the thermal profiles to ones
supportive of mostly snow north of 64, with a rain/snow mix along
the srn tier, **if** sufficiently heavy precipitation falls to fully
wet-bulb the sub-cloud layer. Given that the models have trended
drier with the 12Z run, such a solution is at least somewhat in
doubt. Given the fast progression of the precipitation shield, in
any one area for 3-6 hours, precipitation amounts should be
relatively light, less than a quarter inch expected at this time.
While a light snow accumulation may result, preceding warmth and
ground temperatures would favor most accumulation on elevated
surfaces.
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My grid forecast:

Saturday Night
A chance of snow after 11pm. Mostly cloudy, with a low around 33. Chance of precipitation is 50%.
Sunday
Snow likely before 10am, then a chance of rain between 10am and 2pm. Mostly cloudy, with a high near 41. Chance of precipitation is 60%.
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Debbie Downer AFD out of RAH but is to be expected given climo and still some differences in how much QPF.  MHX on the other hand stops short of waxing it.

Saturday night through Sunday night...Impacting weather will occur
during this timeframe as a low pressure system develops over the
Gulf of Mexico and strengthens as it tracks off the Southeast coast.
Most of the models continue to show accumulating snow over the
northern half of the FA, plus models are trending colder, especially
12z GFS. There remains accumulation differences in exactly how much
snow will fall, but 12z GFS model is bringing the snow farther south
than 24 hrs ago versus the Euro. Have adjusted weather grids to
account for current trends, plus lowered temps based on the colder
temps at 850 mb. Precip will begin early Sunday morning (after
midnight) and lasting through early Sunday evening as high pressure
builds into the area. Stay tune for further updates on this event.
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30 minutes ago, SN_Lover said:

This run is epic. Features a second low bombing up the coast. Would mean a 2 hitter for coastal regions. Busy week next week. 

The PNA ridge is hooking over the top...if that got stronger...EPS showing it too. 

gfs-ens_z500a_namer_23.png

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1 hour ago, mackerel_sky said:

How was 18z GFS ?? Did I miss the talk, or did it just suck/trend north??

pretty much more of the same....not moving much now run to run...of course it did that in Jan as well and gave me 12" of snow run after run after run...ended up with 1.5" of sleet after 32 and rain all night.18 g.png

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