Saturday Forecast

8:41AM

DAYS 1-5 (JULY 15-19)
Today, a trough still is over the area, and the lower levels still have a fair amount of moisture in them, so as suspected for the last several days, clouds are going to be dominant and the day is not without a shower threat, but rain is neither imminent nor a certain enough occurrence as of the writing of this update (8AM) to cancel outdoor plans, unless you much prefer more sunshine and warmer air. For that, you’ll need to wait until tomorrow, when high pressure to the southwest noses its way into New England and the trough aloft has departed sufficiently to allow a warmer and less cloud-filled day. As we get into the early to mid part of next week the weather pattern will undergo the first part of a transition in which a hot ridge of high pressure establishes itself in the western US. What tries to be a passing trough through the northeastern US will shear apart with a piece moving along to the east and the other part dropping to the south and cutting off from the flow over the southern Great Lakes and Ohio Valley when it will then start to drift slowly to the east. This, along with a weak surface high trying to stay established off the East Coast means Monday-Wednesday turn somewhat more humid and run the risk of a few showers and thunderstorms at times – not really a fully unsettled pattern, not a perfectly dry pattern, not a cool pattern, not a hot pattern, not crisp and not excessively muggy, kind of in between it all.
TODAY: Mostly cloudy with a slight risk of isolated showers morning. Partly sunny with isolated showers afternoon. Highs 68-78, coolest coast. Wind light SE.
TONIGHT: Partly cloudy. Lows 60-67. Wind light S.
SUNDAY: Partly cloudy. Highs 77-86, coolest South Coast. Wind S to SW 5-15 MPH.
MONDAY: Partly cloudy. Slight risk of isolated showers. Lows in the 60s. Highs from the upper 70s to middle 80s, coolest South Coast.
TUESDAY: Partly cloudy. Isolated to scattered thunderstorms. Lows in the 60s. Highs from the upper 70s to middle 80s, coolest South Coast.
WEDNESDAY: Partly sunny. Isolated to scattered thunderstorms. Lows in the middle 60s to lower 70s. Highs from the upper 70s to middle 80s along the coast and the upper 80s to lower 90s interior areas.

DAYS 6-10 (JULY 20-24)
The large scale pattern is expected to feature a ridge of high pressure over the western US and a weak to moderate northwesterly flow over the northeastern US. This pattern is typically seasonably warm with brief alternating modified heat and modified cooler shots, timing of these not really doable beyond a few days. This pattern also produces opportunities for showers/thunderstorms especially with air mass changes. Activity may be enhanced early in the period (July 20-21) due to the remains of the Ohio Valley trough sliding eastward through the area.

DAYS 11-15 (JULY 25-29)
The late days of July should feature a somewhat similar pattern, but I believe that somewhere as early as the final days of July we may see a flatting of the flow and an eastward movement of the top of the heat dome from the west that could bring some higher heat this way. Also need to start watching for a possible building high pressure area off the East Coast, though that may occur beyond this period. The overall resultant weather here will be warm to hot with mainly isolated to scattered showers and thunderstorms at times.

20 thoughts on “Saturday Forecast”

  1. Thanks TK, and I echo Tom’s comment, great discussion! One more coolish/mostly cloudy day today, but a pretty typical summer week’s weather ahead. Diurnal showers and storms several days this week but they should favor areas north and west.

    Beyond the end of this week, it’s a very tricky forecast for me. If we’re ever going to get into the heart of the heat dome this summer, I don’t think it happens this month. It can still be warm, as we’ll see this week, just not quite heat wave material. I think there are actually higher risks of more cool and wet periods not unlike the past couple days as we go into next weekend and beyond, rather than risks of more intense heat. But the confidence isn’t there right now to say anything definite.

    1. As time goes along it’s becoming more apparent to me that the evolution of this particular summer pattern brings our most persistent warmth, relative to normal, in August and September.

  2. Today’s weather is an example of why in forecasting we do not just read the data off one model more than 3 days in advance and declare 2 great days for the weekend with confidence.

  3. Thank you ,TK. Ditto from me. Awesome discussion. Perfect move in day and seems like a perfect week to follow.

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