The SI Weather
29Jul/14Tue

7:00 AM | Great weather as we close out July

6-Day Forecast

Today

Mainly sunny, pleasant, highs in the upper 70’s

Tonight

Mostly clear, comfortably cool, lows by morning near 60 degrees

Wednesday

Mostly sunny, a tad warmer, but still cooler-than-normal for this time of year, low 80’s

Wednesday Night

Partly cloudy, cool, low 60's

Thursday

Mostly sunny, warmer, mid 80’s

Friday

Partly sunny, more humid, chance for a shower or thunderstorm, low 80’s

Saturday

Mostly cloudy, still cooler-than-normal, chance for a couple of showers and a thunderstorm, near 80

Sunday

Mostly cloudy, still cooler-than-normal, chance for showers and thunderstorms, low 80’s

Discussion

A strong cold front passed through the region yesterday paving the way for a stretch of very comfortable weather conditions. Temperatures today will have a hard time escaping the 70’s in much of the Mid-Atlantic region and the below-normal temperatures will continue through much of the week. Humidity levels will also be way down for the next couple of days, but will increase at the end of the week as an ocean flow develops.

Video

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28Jul/14Mon

7:00 AM | Another comfortable air mass for this time of year arrives later today

6-Day Forecast

Today

Partly sunny, becoming breezy and not as warm or as humid as yesterday, chance for an additional shower or thunderstorm this afternoon, highs in the low 80’s

Tonight

An evening shower possible; otherwise, partly cloudy skies, more comfortable, lows by morning near 60 degrees

Tuesday

Mostly sunny, cool for this time of year, upper 70's

Tuesday Night

Mostly clear, quite cool, upper 50’s

Wednesday

Mostly sunny, still very pleasant, low 80’s

Thursday

Mostly sunny, nice, low-to-mid 80’s

Friday

Partly sunny, comfortable, chance for a shower or thunderstorm, low 80’s

Saturday

Mostly cloudy, still below-normal temperatures, chance for a shower or thunderstorm, low-to-mid 80’s

Discussion

Powerful thunderstorms pounded the Mid-Atlantic region in the overnight hours ahead of an approaching cold front and that frontal system will works its way through the region later today. The frontal passage will usher in another spectacular air mass for this time of year with low humidity values and comfortable temperatures. The cooler air, anchored by strong Canadian high pressure and below-normal for this time of year, will become quite noticeable later tonight and it should stay quite comfortable for the next few days.

Video

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27Jul/14Sun

12:45 PM | **Could be a wild night in the Mid-Atlantic region**

GFS
[GFS computer model forecast map at 300 mb for later tonight showing an impressive jet streak and upper level wave]

Discussion

The combination of a vigorous upper level wave, impressive jet streak and developing low pressure will generate a wild scene tonight throughout the Mid-Atlantic region with numerous showers and thunderstorms from early evening through late tonight. Some of the thunderstorms will reach severe limits with torrential rainfall, damaging wind gusts, possible hail and even isolated tornadoes. The greatest chance for severe weather tonight will likely be from the eastern part of the Ohio Valley eastward to the Appalachian Mountains, but severe weather potential exists as well into the I-95 corridor from DC-to-Philly-to-New York City.

The timetable for the shower and thunderstorm threat is approximately from 8pm to 3am. All of this activity is associated with an usually strong and widespread cold air outbreak for this time of year that will bring spectacular weather to the Mid-Atlantic region from Tuesday through the rest of the week, but we may have to pay a price before we get there.

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25Jul/14Fri

7:00 AM The weather becomes unsettled this weekend and there can be strong thunderstorms

6-Day Forecast

Today

Mostly sunny, nice, highs in the low-to-mid 80’s
(normal high at DCA is 88 degrees)

Tonight

Mostly clear, comfortable, lows by morning near 65 degrees

Saturday

A mix of clouds and sun, a bit warmer, cannot rule out a few showers and possibly a thunderstorm, upper 80’s

Saturday Night

Mostly cloudy, mild, muggy, chance for showers and thunderstorms, near 70

Sunday

Mostly cloudy, warm, humid, occasional showers and thunderstorms, some of the storms can be quite strong, mid-to-upper 80’s

Monday

Partly sunny, warm, chance for additional showers and thunderstorms, mid-to-upper 80’s

Tuesday

Mostly sunny, quite cool for this time of year, upper 70’s

Wednesday

Mostly sunny, still very pleasant, near 80

Discussion

High pressure will provide a nice end to the work week, but the weather becomes unsettled this weekend and there is a good chance for occasional showers and thunderstorms from Saturday night into Monday and some of the storms can be quite strong with torrential downpours, damaging winds and possible hail. Low pressure will move across the Upper Midwest on Saturday and into the Mid-Atlantic region by late Saturday night before pushing to our north on Sunday. A cold front will then approach on Monday as it moves west-to-east and this will continue the threat for occasional showers and thunderstorms as we begin the new work week. Cooler air anchored by strong Canadian high pressure and well below normal for this time of year will arrive by Tuesday and we’ll stay very comfortable into mid-week.

Video

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