Good Friday all! Our run of dry weather is on borrowed time. Scattered showers/t-storms are due into the area this evening--but the t-storms which sweep the area in clusters Saturday may be formidable. An influx of tropical moisture tangles with the summers unseasonably strong and southward-displaced jet stream--a combo which threatens to spin up waves of active t-storms capable of downpours and strong winds. The area is outlooked Saturday and Saturday night by the Storm Prediction Center for possible severe weather. Its a set-up we explore in detail in our graphic feature off our WGN Chicago Weather Center website today. Also posted is SPC severe weather forecast for Saturday & Sat night, SREF model severe weather composites, which lay out the atmospheric energy and moisture parameters which support the prediction of active storms as well as model precipitable water projections (for Saturday morning and early evening), which place water content at an eye-catching 2 or more. The presence of such elevated moisture levels has rarely in the passed without storms of some note taking shape. Saturday & Sat night are to be periods with some interesting meteorological twists and turns. This set-up warrants monitoring--though rains wont be continuous. Sundays likely to offer us many rain-free hours. But the days warmth and moderately high humidities lead to a potential build-up of t-storms in the afternoon and evening--but with lower areal coverage than those which traverse the area from time to time Saturday. The amplified (i.e. wavy) jet stream predicted next week, which has been the focus of much discussion in recent days, tugs a lobe of unseasonably cool air into the area later Monday and Tuesday. It also sets up an extraordinary range in temps across North America--from the abnormal chill here in the Midwest to the abnormal warmth over the West, including west and northern Canada! (Check out the predicted temp departure and jet stream panels). Temps may struggle to 70 Tuesday--likely to be the coolest of the coming 7 days. A steady temp rebound is to dominate the remainder of the week. blog.chicagoweathercenter/2014/07/11/longest-spell-of-rain-free-weather-in-4-weeks-to-end-with-clusters-of-potentially-active-or-severe-storms-saturdaysaturday-night/ Check out our blog post on active pattern emerging.
Posted on: Fri, 11 Jul 2014 16:01:53 +0000
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