The SI Weather
22Jul/14Tue

2:45 PM | Another chilly air mass for this time of year coming next week

Euro_500mb_anomaly
[Euro 500 mb height anomaly map for next Wednesday; courtesy Weather Bell Analytics at weatherbell.com]

Discussion

The same overall weather pattern that produced a colder-than-normal winter in much of the eastern half of the nation and an impressive cool shot last week will produce another cool shot during the first half of next week in the same general area. Once again, it appears that the pattern is unfolding to allow for the development of a significant trough in the upper atmosphere early next week in the eastern part of the nation and it will be centered on the Upper Midwest. This will produce below normal temperatures for several days in this part of the country with the biggest departure from normal once again focused on the Upper Midwest. Yesterday’s European computer forecast model run for the middle of next week suggests there will be a deep trough of low pressure for this time of year centered over the Upper Midwest – the same type of pattern that we’ve experienced frequently during the past several months (map courtesy Weather Bell analytics at weatherbell.com).

NOAA_records
[Temperature records courtesy NOAA]

Last week’s widespread cool shot was impressive indeed with 2085 cold temperature records set across the nation in the past 7 days as compared with 281 warm temperature records (data courtesy NOAA). It is too early to tell if this next shot of cool air will produce widespread record-breaking chill, but below normal temperatures are very likely (NOAA 6-10 forecast temperature anomaly map shown below for the period July 27th through July 31st).

6-10

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22Jul/14Tue

7:00 AM | More humid today; cold front reaches the region tomorrow night with possible strong storms

6-Day Forecast

Today

Mostly sunny, quite warm, more humid, highs in the mid-to-upper 80’s

Tonight

Partly cloudy, muggy, mild, some fog possible late, lows near 70 degrees

Wednesday

Partly sunny, very warm, humid, chance for showers and thunderstorms late, near 90

Wednesday Night

Mostly cloudy, mild, showers and thunderstorms likely, low 70’s

Thursday

Mostly cloudy, not as warm, showers and thunderstorms still possible, low 80’s

Friday

Mostly sunny, comfortable, low 80’s

Saturday

Mostly sunny, pleasant, low-to-mid 80’s

Sunday

Partly sunny, a bit cooler, chance for showers and thunderstorms, low 80’s

Discussion

High pressure has slipped off the northeast US coastline and more humid air is now pushing into the Mid-Atlantic region. A cold front is dropping southeastward today across the Northern Plains/Upper Midwest and this front will increase our chances for showers and thunderstorms late tomorrow as it arrives in the region and some of the storms can be on the strong side. As the front drifts to our southeast, more refreshing air should return to the region by the end of the work week. After a pleasantly warm day on Saturday, the weather will become unsettled on Sunday and continuing into early next week with the threat for showers and thunderstorms. A cool pattern will become re-established by the middle of next week throughout much of the eastern half of the nation.

Video

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21Jul/14Mon

7:00 AM | Heats up by mid-week, but then relief returns later in the week

6-Day Forecast

Today

Partly-to-mostly sunny, still on the cool side of normal temperature-wise, highs in the low 80’s

Tonight

Partly cloudy, mild, lows in the upper 60’s

Tuesday

Partly-to-mostly sunny, warmer, more humid, mid-to-upper 80’s

Tuesday Night

Partly cloudy, mild, some fog possible late, near 70

Wednesday

Partly sunny, very warm, humid, chance for showers and thunderstorms late, near 90

Thursday

Partly sunny, not as warm, showers and thunderstorms likely, low-to-mid 80’s

Friday

Mostly sunny, more comfortable, low 80’s

Saturday

Mostly sunny, pleasant, low 80’s

Discussion

High pressure that controlled our weather this weekend has slipped off the east coast and this will allow somewhat warmer and more humid air to return to the Mid-Atlantic region over the next couple of days following our spell of refreshing weather. A cold front will approach the Great Lakes region by mid-week and then head towards the Mid-Atlantic later this week. High pressure returns at the end of the week to bring in another refreshing air mass to the Mid-Atlantic region.

Video

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18Jul/14Fri

7:00 AM | Comfortable weather continues into next week, but clouds will prevail at times this weekend

6-Day Forecast

Today

Mostly sunny, pleasant, highs in the low 80’s

Tonight

Partly cloudy, comfortably cool, lows in the mid 60’s

Saturday

Partly sunny, still comfortable, low-to-mid 80’s

Saturday Night

Mostly cloudy, mild, cannot rule out a light shower, mid 60’s

Sunday

Partly sunny, comfortable, cannot rule out a shower or two, near 80

Monday

Partly sunny, still comfortable, near 80

Tuesday

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

Wednesday

Partly sunny, humid, warm, chance for showers and thunderstorms, upper 80’s

Discussion

A refreshing air mass with low humidity has established itself in the Mid-Atlantic region and it should remain rather comfortable through the weekend. After plenty of sunshine today, clouds will tend to be more prevalent this weekend and then it'll turn warmer and more humid as we begin the new work week. Some record lows have been broken or tied this morning in the Mid-Atlantic region in such locations as the following: Fort Meade, MD; Baltimore, MD; Harrisburg, PA; Latrobe, PA, Jamestown, NY and Franklin, PA.

Video

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