Hot, Humid & Some Sct’d Storms Today

August 23rd, 2014 at 11:34 am by under Chad's WLFI Weather Blog

It is very warm & muggy as of 11:45 a.m.

With the temperature already 84 at the station as of 11:50 a.m. with a dew point of 73, 90-93 in the area still seems reasonable today with heat indices near 100 (especially with boundary of really hot air lifting northward toward our area).

In fact, at 10:54 a.m. (an hour ago), it was 81 degrees at Grissom Air Reserve Base.  With this, the dew point was 81, giving them 100% relative humidity.  Now that is oppressive.  The Burlington sensor had a temperature of 83 with a dew point of 80 at 11 a.m.  These stations are near transpiring corn/vegetation, with the wet soils, which often leads to localized very high dew points, especially when the wind is light to calm like at the time.

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Outflow boundary from storms across southern Indiana last night has moved north & gelled with our old, weak surface stationary front (which is more of a wind shift line now from E & SE to S & SW).

Meanwhile, outflow boundary is surging out from complex of storms in Iowa & northwestern Illinois with its MCV.

There is also a secondary weak surface boundary across Illinois, which is more of a warm front separating the truly dangerous heat from the more typical summer heat.

This boundary is lifting northeastward.

All of this said, with our surface CAPE up to 3000 J/kg & our lower atmosphere uncapped (with a reservoir of 5000 J/kg surface CAPE already in Illinois), a few storms will likely form on any one of these boundaries & affect us this afternoon &/or this evening.

These storms would tend to be pulsey with isolated severe wind/hail potential with an overall coverage of 30% for the area per most recent analysis.  We will watch to see if the scattered storms can gell into a cluster & if that line in Illinois can form a good cold pool, expand southeastward with some severe gusts.

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2 Responses to “Hot, Humid & Some Sct’d Storms Today”

  1. Ryan H says:

    Looks like a bow developing in central Illinois.

  2. yep is that coming this way

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