Area forecast discussion
National Weather Service Baltimore Maryland/Washington District of Columbia
330 am EDT Sat may 25 2013
Synopsis...
High pressure will build into the middle Atlantic region through the
weekend. The high will move offshore early in the week...promoting
a warm up.
&&
Near term /today/...
As of 07z...upper low is centered over New Jersey with back edge of middle-level
cloud shield breaking up over the Maryland western shore. Precipitation has ended
across the area. Low upslope clouds persist over The Laurels of PA
and the Allegheny Highlands of MD/WV...but are expected to continue
eroding as the low level flow backs from north-northwesterly to northwesterly...changing the
source region.
Today...a vorticity lobe currently seen in infrared/WV over the Georgian Bay of
Lake Huron brings some middle-level clouds over central Maryland around midday.
Otw sunny with downsloping northwesterly flow gusting to around 30 miles per hour. Maximum
temperatures upper 60s to 70f at lower elevations across the County Warning Area.
&&
Short term /tonight/...
Northwesterly gusts ease with only sheltered valleys decoupling. Min temperatures
low 40s inland with some upper 30s in the shen valley and around 50f
for urban/near shore.
Cool again in the Allegheny Highlands...went for middle 30s with 925
and 850mb temperatures prognosticated a couple degrees higher than now. Despite
expected mixing will go with a frost advisory for western portions of
Allegany...Mineral...and Grant counties (division is the Allegheny
front) as well as Highland/ Pendleton. Temperatures tend to drop off
rapidly in clear conditions as expected tonight...so went for
midnight to 8 am for the headline.
&&
Long term /Sunday through Friday/...
The extend portion of the forecast looks pretty cut and dried. High pressure
over the area Sunday should bring plenty of sunshine and continued
cooler than normal temperatures. On Monday hgh temperatures should draw closer to
normal - u70s. Aftr that daytime temperatures should climb as high pressure
moves offshore and a trough develops east of The Rockies right through
Friday. Highs in the u80s...possibly a90 by week's end. Lows in the 60s.
Precipitation chances look pretty scant in the coming weak. Perhaps afternoon/evening
isolated thunderstorms over the mountains for the 2nd half of the weak.
&&
Aviation /06z Saturday through Wednesday/...
Northwesterly flow continues to gust around 20 knots until sunrise...with 25 to
30 knots through the daylight hours. Gusts ease this evening with
around 10 knots overnight. VFR with any ceilings breaking this morning.
In the extend VFR conds expeceted through midweek.
&&
Marine...
Northwesterly flow 20 to 25 knots overnight...increasing to 30 knots during
daylight hours with an Small Craft Advisory. Winds ease this evening with middle/upper
tidal Potomac dropping off the Small Craft Advisory at 8pm. Rest of waters see 20 knots
gusts through tonight.
In the extend...it is likely that some gusts reaching Small Craft Advisory level will occur
on the Bay/lower ptmc Sun afternoon. Then no probs expeceted on the waters
mem day or through midweek
&&
Coastal flood...
Gusty northwest flow will continue to push water out of the Chesapeake
Bay...with water levels -1 to -1.5 MLLW at low tide through this
evening.
Lwx watches/warnings/advisories...
District of Columbia...none.
Maryland...freeze warning until 8 am EDT this morning for mdz501.
Virginia...freeze warning until 8 am EDT this morning for vaz503.
WV...freeze warning until 8 am EDT this morning for wvz501-503-505.
Marine...Small Craft Advisory until 6 PM EDT Sunday for anz530-531-538-
539.
Small Craft Advisory until 4 PM EDT Sunday for anz532>534-537-
540>543.
Small Craft Advisory until 8 PM EDT this evening for anz535-
536.
&&
$$
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