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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Saturday
• 
• High: 70 °
• Low: 48 °
• Partly Cloudy

• Sunday
• 
• High: 72 °
• Low: 50 °
• Clear

• Monday
• 
• High: 77 °
• Low: 55 °
• Clear

• Tuesday
• 
• High: 77 °
• Low: 68 °
• Partly Cloudy

• Wednesday
• 
• High: 88 °
• Low: 70 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Baltimore Maryland/Washington District of Columbia 
227 PM EDT Sat may 25 2013 


Synopsis... 
high pressure will build into the middle Atlantic region through the 
Memorial Day weekend. The high will move offshore Monday...and a 
warm front will cross the area on Tuesday. An upper ridge then 
builds through the rest of the week. 


&& 


Near term /through Sunday/... 
17z surface analysis indicated about 1004 mb low pressure in the 
Gulf of Maine...while 1030 mb high pressure was moving southward 
through the Great Lakes and into the Ohio Valley. 


Tight gradient between these two pressure systems have helped to 
produce another windy day...gusting at or above 25 miles per hour at times. But as 
high pressure continues to build in through the late 
afternoon/evening...gusts should diminish particularly around 
sunset. 


Have seen few-scattered cumulus development this afternoon particularly along 
the ridges and northern portion of the County Warning Area. But the atmosphere is 
relatively dry and stable...so cumulus have been rather flat and have 
not put much of a Dent in abundant sunshine today. Like wind 
gusts...any clouds should diminish around sunset...leaving a 
clear sky overnight. 


Despite the sunshine and a downsloping flow east of the 
mountains...temperatures have been slow to rise this afternoon and 
middle 60s may be as high as we get for many areas. Normal is middle to 
upper 70s. This will pave the way for another chilly night with 
minima in the 40s east of the Blue Ridge and 30s west of there. 
Will continue the frost advisory for The Highlands for minima in 
the mids 30s...and with winds expected to drop off late tonight. 


On Sunday...northwest flow continues but it should not be as windy 
as today and the cool air mass should begin to modify. 
Therefore...expect temperatures to rebound around 70 in the 
afternoon with ample sunshine. 


&& 


Short term /Sunday night through Tuesday/... 
high pressure is forecast to move off the coast on Memorial Day 
Monday...resulting in a return flow to develop. May start to see 
an increase in clouds especially Monday night to the north of a 
warm front. This warm front will cross the County Warning Area on 
Tuesday...instigating a more significant warming trend. With the 
warm front and a return in moisture...there is a small chance of 
convection late Monday night into Tuesday...but most areas may 
wind up staying dry. 


&& 


Long term /Tuesday night through Saturday/... 
above normal temperatures are expected middle to late week...perhaps 
even into the weekend as an upper ridge builds over the eastern 
states. Under the ridge...subsidence will likely put a lid on 
convection...however can/T rule out isolated diurnally driven 
storms over the mountains. 


&& 


Aviation /17z Saturday through Wednesday/... 
wind will be the weather-related aviation impact through the rest 
of the afternoon at the lwx terminals. With good 
mixing...northwest winds of 15 knots will gust to 25 knots for the rest 
of the afternoon. Gusts diminish after sunset as high pressure 
builds in from the rest. 


Aside from a small chance of thunderstorms Tuesday...no 
significant weather is expected during the outlook period. 


&& 


Marine... 
northwest winds continue this afternoon with low pressure in the 
Gulf of Maine and high pressure building in from the west. Small 
Craft Advisory continues...with occasional gusts around 25 knots 
through the afternoon. Winds diminish some tonight...enough for 
the Small Craft Advisory over the Upper/Middle tidal Potomac to drop. Will continue 
with Small Craft Advisory over much of the Bay/lower tidal Potomac into Sunday for 
20 knots gusts. 


High pressure builds in through early next week. Will have to 
watch southerly flow up the for gusts at or above 15 knots during the middle 
week. 


&& 


Fire weather... 
dewpoints in the 30s will remain over the area this afternoon. As 
temperatures rise into the middle 60s...this may bring relative humidity values of 
near 30 percent in some areas. This will occur as winds continue 
to gust 20 to 25 miles per hour. However...fuel moistures are very high which 
will limit an enhanced fire risk. 


&& 


Lwx watches/warnings/advisories... 
District of Columbia...none. 
Maryland...frost advisory from midnight tonight to 8 am EDT Sunday for 
mdz501. 
Virginia...frost advisory from midnight tonight to 8 am EDT Sunday for 
vaz503-504. 
WV...frost advisory from midnight tonight to 8 am EDT Sunday for 
wvz501-503-505-506. 
Marine...Small Craft Advisory until 6 PM EDT Sunday for anz530>534- 
537>543. 
Small Craft Advisory until 8 PM EDT this evening for anz535- 
536. 


&& 


$$ 
Bpp