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Periods Of Heavy Rain Sunday Night & Monday Will Lead To A Flash Flood Threat

For The Rest Of This Afternoon: Widely scattered showers and thunderstorms are expected to continue throughout the rest of this afternoon across mainly Western Mass. In fact, the greatest coverage of showers and thunderstorms is expected to be across the Berkshires where local rainfall amounts of between one half of an inch and one inch is possible. Other than this, it will be very warm and very humid throughout the rest of this afternoon with temperatures between 85 and 90 Degrees. Tonight: Any leftover showers and thunderstorms will weaken and dissipate shortly after sunset this evening. Other than that, low clouds and areas of fog will develop across the region by after midnight in the very humid air mass. Low temperatures will be between 65 and 70 Degrees. Sunday: Another warm and very humid day is expected on Sunday. In addition, a frontal boundary now located over the Ohio Valley will slowly make its way eastward towards our area. Most of the energy with this front will remain to our west during Sunday. This all means that some widely scattered showers and thunderstorms can be expected during Sunday afternoon. Any heavy showers or thunderstorms will be capable of producing some torrential downpours, but the really heavy rain is expected to hold off until Sunday night and Monday. High temperatures will be between 80 and 85 Degrees. Heavy Rain Late Sunday Night Through Monday Will Result In The Threat For Flash Flooding: That frontal boundary will push its way into southern New England during Sunday night and Monday. At the same time this is happening, an area of low pressure will slowly move along this front. The combination of a very humid air mass, as well as energy and forcing from both the front and the low pressure system will help to produce the very real threat for heavy rain across Western and Central Mass during Sunday night and Monday. This heavy rain will fall on a very saturated region leading to the threat for flash flooding. In addition to the flash flood threat, latest forecast guidance continues to point to some of the rivers and streams across the region to flood during the first half of next week. This flood threat is something that I’m watching extremely closely. For Sunday night, I think that we’ll see scattered showers and thunderstorms during the evening that will become widespread late at night. Heavy downpours are likely with any thunderstorms late at night Sunday night. Low temperatures Sunday night will be between 65 and 70 Degrees. Monday looks very wet with widespread showers and thunderstorms throughout the day. Frequent rounds of heavy rain is likely during the day on Monday which could lead to flash flooding across the region. If that wasn’t enough, there’s also expected to be the possibility for some strong thunderstorms from late morning through the afternoon hours on Monday. Primary threat from any strong storms look to be very gusty winds. High temperatures Monday will be between 75 and 80 Degrees. Total rainfall amounts from Sunday night through Monday are expected to range from 1.50 inches to 2.50 inches with locally higher amounts across Central Mass to 2.50 to 4 inches with locally higher amounts across Western Mass. Upwards of 5 inches of total rainfall is possible across the Berkshires. Tuesday: The coverage of shower and thunderstorm activity should be much less for Tuesday with generally partly sunny skies expected. At this point, I think that some scattered hit or miss shower and thunderstorm activity is possible for Tuesday afternoon. High temperatures will be between 80 and 85 Degrees. Wednesday Through Friday: The rain forest type weather is likely to continue through all of next week across the area with no reprieve from the very humid conditions. Wednesday looks like it’ll feature partly sunny skies with high temperatures between 85 and 90 Degrees. Thursday is expected to be partly sunny with high temperatures between 85 and 90 Degrees. Yet another frontal system is expected to push across the region with a wave of low pressure moving along this front late Thursday night and Friday. This means another round of heavy showers and thunderstorms with heavy downpours and a threat for more flash flooding could be in the offing for the period from late Thursday night through Friday.

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