The SI Weather
18May/12Fri

7:00 AM | Very nice end to the work week; coastal storm rains likely by Sunday night and Monday

6-Day Forecast

Today

Mostly sunny, pleasant, upper 70’s

Tonight

Mostly clear, cool, low 50’s

Saturday

Mostly sunny, still pleasantly, upper 70’s

Saturday Night

Partly cloudy, cool, low 50’s

Sunday

Partly sunny, warm, chance for showers by late in the day or at night, mid-to-upper 70’s

Monday

Mostly cloudy, breezy, showers likely, mid 70’s

Tuesday

Mostly cloudy, a few showers possible, upper 70’s

Wednesday

Partly sunny, warm, still the chance for a shower, near 80

Discussion

High pressure will control the weather going into the weekend, but we’ll have to monitor a low pressure area along the Southeast US coast. This low pressure area has a chance of affecting the region by late in the weekend and/or early next week as it could sneak up the coast. Temperatures will remain quite pleasant over the next few days with highs primarily in the 70’s. A few more showers are possible on Tuesday as a weakening cool front approaches the region.

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17May/12Thu

7:00 AM | Nice weather pattern for the next few days

6-Day Forecast

Today

Mostly sunny, pleasant, mid 70’s

Tonight

Partly cloudy, cool, low 50’s

Friday

Mostly sunny, pleasant, mid 70’s

Friday Night

Mainly clear, cool, low 50’s

Saturday

Mostly sunny, pleasant, mid 70’s

Sunday

Mostly sunny, pleasant, mid-to-upper 70’s

Monday

Mostly cloudy, breezy, cooler, chance for showers, mid 70’s

Tuesday

Mostly cloudy, breezy, showers likely, near 80

Discussion

High pressure will return to the Mid-Atlantic region for the rest of the week and sunshine will dominate the weather picture as a result right through the beginning of the weekend. After that, we'll have to monitor a low pressure area along the Southeast US coast that could affect our weather early next week. Temperatures will be on the pleasant side for the next couple of days with highs generally in the 70’s. Another frontal system is likely to approach our region from the west on Tuesday renewing the threat for showers.

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16May/12Wed

7:00 AM | A weak front to deal with today and then high pressure dominates through the weekend

6-Day Forecast

Today

Becoming partly sunny, warm, but still the chance for a shower or thunderstorm, low 80’s

Tonight

Partly cloudy, turning cooler late, mid 50’s

Thursday

Mostly sunny, pleasant, mid 70’s

Thursday Night

Partly cloudy, chilly, upper 40’s

Friday

Mostly sunny, pleasant, mid 70’s

Saturday

Mostly sunny, pleasant, mid 70’s

Sunday

Mostly sunny, pleasant, upper 70’s

Monday

Increasing clouds, breezy, milder, near 80

Discussion

Low pressure has now passed us by to the northeast, but a weak cold front will approach the area later in the day. As a result, while there can be sunny intervals today, there is still the threat for a few showers and maybe a thunderstorm. High pressure will return to the Mid-Atlantic for the rest of the week and sunshine will dominate the weather picture as a result right through the upcoming weekend. Another front is likely to approach from the west by about Tuesday of next week bringing us the chance for showers once again.

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15May/12Tue

12:00 PM | 2012 Tropical and Summer Outlook

Discussion

The summer of 2011 brought the Mid-Atlantic region hotter-than-normal weather and was quite active in the tropical Atlantic in terms of the number of named tropical storms. There are some differences, however, to this year’s sea surface temperature anomalies in both the Atlantic and Pacific Oceans that should result in a noticeable change from last summer. To begin with, there are now some cooler-than-normal waters off of the western African coast as well as in the western Atlantic nearer to the US east coast. Also, the current La Nina phase of the tropical Pacific (i.e. cooler-than-normal water), which was persistent all of last summer, appears to be transitioning towards a neutral signal and then will likely develop into a weak El Nino (warmer-than-normal water) by mid-summer. These two factors should tend to inhibit tropical activity somewhat this summer; especially, during the 1st half of tropical season (Jun-mid Aug) when “African-based” storms dominate the Atlantic Basin tropical scene. During the 2nd half of the tropical season (late Aug-Oct), however, the warmer-than-normal Gulf of Mexico waters may lead to a more active period for the US when tropical systems are usually more “home-grown” and tend to develop closer to home. As far as the Mid-Atlantic summer is concerned, several analog years suggest that it may be quite normal temperature-wise or perhaps even a tad cooler than normal along with slightly higher rainfall amounts.

In summary, the current and expected near term oceanic conditions suggest the following:
1) Normal to slightly-below normal Atlantic tropical season
a. 10-11 named tropical storms
b. 5-7 hurricanes

2) The most active period for the US in terms of tropical systems should occur during the 2nd half of the season (late Aug-Oct) after a relatively slow start

3) Normal to slightly cooler-than-normal temperatures are expected for the Mid-Atlantic this summer (June-Sept) with slightly higher-than-normal rainfall amounts

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