Stormsfury wrote:FLguy wrote:Stormsfury wrote:Just noticed that the 1024 mb high in the Mid-Atlantic (Day 7) would serve to continue to keep cold air in the Carolinas, and although, the 850mb temperatures warm across the lower South Carolina region, CAD may keep the moisture as freezing/frozen depending on the depth of the colder SFC air.
SF
probably...since the models dont handle it that well...but with 850 temps above 0C and impossible to tell the depth of the cold (or below freezing) layer theres no way to tell precip type.
http://cyclone.plymouth.edu/cgi-bin/gen ... &cu=latestbut with 850 temps of only +2C across southeast SC theres a good chance that P-type would probably be FRZRA or sleet. but is really hard to say based on the low-resolution EC and the long range. were talking about 7 days out here.
And given my experience, the ECMWF has a slight warm bias in the MR (like during the PDS of 2003, the temperatures trended colder and colder as we neared the event ... and also, according to the EC, the moisture initially has to overcome some VERY dry air in the Southeast beforehand ... so evapo cooling will play some role as well ...
SF
which should imply at least a period of mixed precip in most area to start and where soundings are isothermally near 0C thru a deep layer...snow may be favored initially
but we must also remember the origin of this system...its loaded with moisture and going to put down a hell of alot of precipitation north of its track but with that comes warm air. the warm advection from a system like this can wreak havoc with precipitation types in the face of a weak ageostrophic component moreso than a coastal system in the mid-atlantic or northeast would. so while i think mixed precip is a good bet to start its hard to tell what goes on thereafter. if the high is stronge rthe CAD stronger and a more impressive ageostrophic component is present then its possible. and that said i dont think that coastal sections will hold the frozen precip.
but lets hold off on the speculation for now. for some reason it always seems we get caught up in this material which shgould be saved for the SR 7 days out. lets concern ourselvs moreso with the synoptic set-up to first make sure this is all possible.
yes i know i at times encourage it...lol