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September 2011 General Discussion/Obs


Chicago Storm

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Just had another great quick-hitting storm. It was raining cats and dogs and the thunder was pretty impressive for such a stable atmosphere. Easily picked up a half inch in the 30 minutes or so it has rained.

the atmosphere wasn't stable, lapse rates have been steep for days, especially over the lake.

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the atmosphere wasn't stable, lapse rates have been steep for days, especially over the lake.

What I meant was it was relatively stable over land. I tend to look at juice in the atmosphere as the main element of instability. The storm yesterday blew up over land, so even though the lake was unstable, it was over land that it intensified. MKX expected only isolated thunder, and it turns out we got a lot more than that.

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What I meant was it was relatively stable over land. I tend to look at juice in the atmosphere as the main element of instability. The storm yesterday blew up over land, so even though the lake was unstable, it was over land that it intensified. MKX expected only isolated thunder, and it turns out we got a lot more than that.

It was unstable over land as well. Juice in the atmosphere isn't a technical term, but pwats have been high and when combined with lapse rates sufficiently steep thunder isn't all that shocking. MKX was spot on with the isolated thunder since only a minor portion of the CWA experienced thunder.

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What I meant was it was relatively stable over land. I tend to look at juice in the atmosphere as the main element of instability. The storm yesterday blew up over land, so even though the lake was unstable, it was over land that it intensified. MKX expected only isolated thunder, and it turns out we got a lot more than that.

They developed along a boundary that was sitting just offshore. ...and isolated t'storms is about all that occured.

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What I meant was it was relatively stable over land. I tend to look at juice in the atmosphere as the main element of instability. The storm yesterday blew up over land, so even though the lake was unstable, it was over land that it intensified. MKX expected only isolated thunder, and it turns out we got a lot more than that.

It might've been stable at the surface but that doesn't always tell the whole story.

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12z GFS has winds at 850 mb over MSN hitting hurricane force, gets up to 76 mph at hour 36 (Thursday evening). It's suggesting some showers will be rolling around, that's the best hope for mixing strong winds down to the sfc. It'll be interesting to watch as things evolve upstream, it'll give us an idea of how strong winds will actually be with this disturbance.

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IWX did a writeup about the tornado yesterday. Interestingly it produced no lightning and tops were only 16,000 feet

http://www.crh.noaa....=73402&source=0

IWX also wrote up this Public Statement this afternoon:

...FUNNEL CLOUDS BEING REPORTED WITH A FEW SHOWERS...

NATIONAL WEATHER SERVICE DOPPLER RADAR WAS SHOWING NUMEROUS SHOWERS

ACROSS PORTIONS OF NORTHERN INDIANA...FAR SOUTHERN LOWER MICHIGAN

AND NORTHWESTERN OHIO. A REPORT OF A FUNNEL CLOUD WAS RECEIVED

EAST OF CRUMSTOWN AROUND 135 PM EDT. THESE ARE NOT THE TYPE OF

FUNNEL CLOUDS TYPICALLY ASSOCIATED WITH STRONG THUNDERSTORMS.

HOWEVER...CONDITIONS ARE FAVORABLE FOR FUNNEL CLOUD FORMATION AND

BRIEF BUT WEAK TORNADOES COULD OCCUR IN THE RARE CASE THAT ONE OF

THESE FUNNELS REACHES THE GROUND. IF YOU OBSERVE A FUNNEL

CLOUD...TAKE COVER IMMEDIATELY AND REPORT TO LAW ENFORCEMENT.

FUNNEL CLOUDS...WIND GUSTS TO 30 MPH...AND BRIEF MODERATE DOWNPOURS

ARE ALL POSSIBLE.

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