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From: Thomas Giella (fmci{at}gbronline.com)
Date: Tue Jan 07 2003 - 17:20:19 EST
2003 Florida Daily Weather Discussion
http://www.kn4lf.com/sub/fmci17.htm
2003-6 Published 01/07/03 at 4:00 PM EST
For those of you used to an 11:00 AM post, I decided to delay until now, so
as to get a better handle on the regional synoptic situation. We have seen
some pretty strong cold air advection (CAA) so far today with temperatures
10-20 deg. colder then this time yesterday but the dry air advection has not
been that impressive. There is a slight NNE component along the east coast
allowing for some moistening of the surface flow along and east of the
central ridge.
At 4:00 pm dewpoints in the low 20's have reached down to the latitude of
Ocala, with upper 20's down to the latitude of Brooksville, west of the
Ronald Reagan Florida Turnpike. Here in rural west Plant City east of the
Tampa the dewpoint is 32 deg. with low 30's along the inland west side of
the peninsula down to Collier County.
Yes it was cold AGAIN early this morning with the subfreezing line down to
near S.R. 50 west of U.S. 27, with subfreezing wind chills deep into the
southern peninsula. The cold spot in the state was 27 deg. at MacClenny and
Bell in the NE part of the state. The cold spot on the central peninsula was
30 deg. at Inverness, Ocala and west Nobleton. The cold spot on the southern
peninsula was 41 deg. at the tourist mecca of Devils Garden with 41 deg.
Some other notable minimum temperatures include 30 deg. at Alachua, 32 deg.
at Brooksville, Citra, Putnam Hall and 33 deg. at Mount Plymouth.
In the Tampa Bay area the minimum temperatures were:
35 deg. Rural West Plant City
35 deg. Rural North Plant City (Knights Station)
35 deg. Urban Climate Station Plant City
37 deg. Suburban East Tampa Vandenberg Airport
38 deg. Rural FAWN Station Dover
39 deg. Suburban Lakeland Linder Airport
40 deg. Suburban NWS Tampa Bay Office Ruskin
40 deg. Rural Balm
41 deg. Urban/Coastal Tampa International Airport
43 deg. Urban/Coastal St. Pete/Clearwater Airport
44 deg. Urban/Coastal Mac Dill AFB
45 deg. Urban/Coastal St. Pete. Albert Whitted Airport
Minimum temperatures were uniform due to wind but on calm clear nights huge
temperature differences of up to 20 deg. occur between inland versus coastal
and rural versus urban locations.
Tonight is another tough minimum temperature forecast, not that any are ever
easy here on heterogenous FLorida peninsula. I don't think we will see
optimum radiational cooling conditions overnight. With the main cold and dry
surface high pressure center axis still along the upper Texas coast,
boundary level winds will stay up, with occasional mixing down to the
surface of a light inversion busting winds and a slight onshore flow.
However if a surface ridge extension noses eastward to the central peninsula
later tonight, winds "could" go calm for an extended period of time, with
the coldest temperatures across the inland rural citrus and vegetable
growing region of the south central/northern Everglades region of the
southern peninsula. We also still have several mid level vorticity maximums
that will swing through overnight with occasional broken cirrus clouds, that
could slow the temperature fall.
Bottom line though I think the subfreezing line will extend southward into
the inland rural southern peninsula down to near U.S. 41 west of U.S. 27,
with a significant freeze in inland rural areas north of I-4 and west of the
Ronald Reagan Florida Turnpike.
Thomas Giella
FL Meteorological & Climatic Institute
http://www.kn4lf.com/sub/fmci.htm
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