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The Heat is On Through Wednesday
Welcome relief starting Thursday

Jason Samenow @ 8:00 AM

The hottest temperatures of the summer are here as the mercury takes aim at 100 degrees today and tomorrow. Relief is on the way Thursday, as a cooler pattern sets in that should last at least through the weekend.


Forecast Confidence: HighScorching heat. Expect a day just like yesterday, except a bit hotter and a bit more sticky. High temperatures should range from 96-100 under partly to mostly sunny skies. Humidity will be more noticeable than yesterday, but not as bad as it could be. The relative humidity should be in the 35-40% range in the afternoon with dewpoints in the low 60s. So, the heat index won't be much higher than the actual temperature. Accordingly, the National Weather Service has not issued a Heat Advisory which requires heat indices of least 105. Still, take it easy if you're spending considerable time outside.

Overnight, it will be mostly clear and muggy with lows 70-75.

The Upcoming Week at a Glance

Warmest Day: Today, 100.
Coolest Day: Friday, 84.
Rain Chances: Tuesday (20%), Wednesday PM (35%), Thursday (30%)
Dry Days: Today and Friday through the weekend.
The Week's Wild Cards: Will it crack 100 today or tomorrow? Will strong thunderstorms develop Wednesday? Will clearing be rapid or slow Thursday? Will a wave form along a stalled frontal boundary and bring any rain to the region over the weekend?
Climatological Average High/Low: 89/70


Forecast Confidence: HighQuite hot and humid. We're looking at another scorcher. An increase in afternoon clouds may hold temperatures below the century mark, but the humidity will be a notch higher. High temperatures should range from 95-99, with heat indices 98-103 -- close to Heat Advisory criteria. An isolated thunderstorm is possible but not likely -- odds are less than 20%. Overnight, it will be partly cloudy and muggy, with lows 71-76 (suburbs-city).


Forecast Confidence: Medium-HighHot and humid, PM Storm threat. Wednesday should be the final day of the current heat wave as a cold front approaches from the west. It will be another sultry afternoon, with highs in the mid 90s and heat indices near 100. Showers and thunderstorms are possible (35% chance) during the evening hours and a few could be strong. Overnight, showers and thunderstorms remain a possibility (30%) as the cold front moves through the area, with lows around 70.


Forecast Confidence:Medium-HighNot as hot, gradual clearing? Behind the cold front, it's possible a few showers and thunderstorms could linger (30%). More likely, though, we'll experience gradual clearing and noticeably less sticky conditions. High temperatures should be in the mid to upper 80s. The drier and more comfortable air should be readily apparent by the overnight hours, with lows 62-67 (suburbs-city).


Forecast Confidence: Medium-HighPartly sunny and pleasant. Cool and dry high pressure will build in from the northwest bringing much more enjoyable weather. We should have a mix of clouds and sun, with highs in the mid 80s. Humidity levels are likely to be quite comfortable. Overnight, it should be clear and possibly cool enough to open up the windows -- with lows 60-65 (suburbs-city).

The Weekend

Forecast Confidence: mediumWarm and dry. The way it looks right now, the weekend should be pretty nice with low humidity and seasonably warm temperatures. High temperatures should generally be in the mid to upper 80s with overnight lows in the 60s to near 70. We will need to watch the stalled out frontal boundary to our southeast (the remnants of the cold front that moved through the area Wednesday night). There is some chance it could drift northwestward with a wave of low pressure along it, increasing clouds and the rain threat Saturday.

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