Discussione scientifica sulle previsioni

NWS Discussion
			
				

Area forecast discussion 
National Weather Service Newport/Morehead City NC 
230 am EDT sun may 26 2013 


Synopsis... 
high pressure will build over the area from the northwest through 
tonight...then extend over the area from offshore through next 
week. 


&& 


Near term /through today/... 
as of 230 am Sunday...high pressure continues to build into the 
area from the northwest producing a flow of cool and dry low level 
air across eastern NC. Satellite imagery indicates middle and high 
level clouds streaking southeast into eastern NC early this 
morning. These clouds will be most widespread across the SW zones 
with the northeast zones remaining mostly clear. The clouds are 
forecast to dissipate after 18z this afternoon. After a chilly 
start with low temperatures near record levels...highs are 
expected to remain below normal but average a little higher than 
yesterday with middle 70s inland and upper 60s to lower 70s at the 
beaches. Winds will be light with local sea breeze circulations 
expected to develop late in the afternoon. 


Some record lows for this morning 5/26: 


Kewn 50 1967 
Greenville 43 1988 
Washington 51 1904 


&& 


Short term /tonight/... 
as of 230 am Sunday...high pressure will crest over the area 
tonight producing light winds and clear skies. Resulting strong 
radiational cooling will produce another night of chilly 
temperatures with readings in the upper 40s to lower 50s inland 
and 55 to 60 at the beaches. 


&& 


Long term /Monday through Saturday/... 
as of 230 am sun...25/12z European model (ecmwf) and 26/00z GFS in very close 
agreement through the extended period. Upper ridge will continue 
to build through midweek...peaking on Thursday. The ridge axis 
will then shift east as an upper trough approaches from the west. At 
the surface a warm front will lift through on Tuesday. Time 
sections indicate low level Theta-E ridge along with sufficient 
lift and moisture content to keep isolated convection in the 
forecast. Otherwise dry and warm through the week as the offshore 
ridge builds west into the Carolinas. 


&& 


Aviation /06z Sunday through Thursday/... 
short term /through Sunday night/... 
as of 1230 am Sunday...high confidence in VFR conditions through 
the taf period as high pressure with dry air prevails across 
eastern NC. Some increase in middle and high level cloudiness is 
expected late tonight into early Sunday afternoon. Winds will be 
much lighter with speeds expected to remain 10 knots or less. 


Long term /Monday through Thursday/... 
as of 230 am sun...isolated afternoon/evening convection possible 
Tuesday. Otherwise dry/VFR. Light south southwest surface winds. 


&& 


Marine... 
short term /through tonight/... 
as of 230 am Sunday...high pressure will build over the waters 
through tonight. Light variable winds currently over the 
waters may briefly surge this morning out of the northwest to 15 
knots mainly over the northern...central...and sound waters peaking 
around 12z. The flow then is expected to become light again as the 
gradient relaxes this afternoon leading to the development of 
local sea breeze circulations (onshore flow). Tonight winds are 
forecast to be 10 knots or less. Seas 2 to 4 feet today will be 2 to 3 
feet tonight. 


Long term /Monday through Thursday/... 
as of 230 am sun...used a consensus blend of the latest run of the 
European model (ecmwf) and GFS. Main weather feature will be the surface ridge 
centered over the central west Atlantic through the period. Mainly 
light south winds no higher than 15 knots...and seas running 2-4 
feet. 


&& 


Mhx watches/warnings/advisories... 
NC...none. 
Marine...none. 


&& 


$$ 
Synopsis...jme 
near term...jme 
short term...jme 
long term...hsa 
aviation...jme/hsa 
marine...jme/hsa