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Isaac Heavy Rain Event


Hoosier

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Actually the post stating that a specific area is missing out on something 4 1/2 days out is completely unnecessary especially knowing it is a fluid situation with this.

In mostly commenting on the trend. It's been moving the system south over the last few runs.

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That looks like a pretty good track to me for a soaking rain in the LL. If I was south of I-70 I'd be worried about the threat of little rain amounts. Like someone mentioned earlier - the heavier rains shift to the north and west side of the low as it moves over land.

212335W5_NL_sm.gif

I'm going to say 2-5" amounts will be common somewhere in the subforum area this weekend. Still a lot of details to iron out between now and the weekend on where the heaviest rains set up.

- Stebo, I think your analysis will be on target or darn close regarding a N/W trend.

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It is encouraging to see Isaac currently moving W/WNW and making very little northward progress. The big question for us in the Great Lakes is at what point does it start to shift eastward from its expected northerly progress. Like Jonger, I fully expect to be screwed, I have yet to see one good run of the OP GFS or the Euro really until 12z.

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It is encouraging to see Isaac currently moving W/WNW and making very little northward progress. The big question for us in the Great Lakes is at what point does it start to shift eastward from its expected northerly progress. Like Jonger, I fully expect to be screwed, I have yet to see one good run of the OP GFS or the Euro really until 12z.

Your area is a bit far to the North and West, so I wouldn't be shocked if your area was shut out. The system will be moving SW-NE and eventually W-E. Unless it gets up to say SE Iowa you probably will miss out on most if not all of this one.

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Your area is a bit far to the North and West, so I wouldn't be shocked if your area was shut out. The system will be moving SW-NE and eventually W-E. Unless it gets up to say SE Iowa you probably will miss out on most if not all of this one.

Getting it up to Iowa sure is the goal right now. It seems like no matter how far the models are showing Isaac going west initially, they still turn east before it gets to Iowa.

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Getting it up to Iowa sure is the goal right now. It seems like no matter how far the models are showing Isaac going west initially, they still turn east before it gets to Iowa.

That's climo pretty much. LOT mentioned 17 remnant storms have passed within 100 miles since 1898 and they are usually moving east or northeast by then. I wouldn't be surprised if the number is lower for Milwaukee.

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I know Milwaukee missed a lot of the heavy rain from Lowell/Ike in September of 2008 (1-2" from the map posted back a couple pages), but just 50 miles south there was 4"+. The IL/WI border seems to be a sort of northward barrier for tropical remnants. - Unless a separate storm system can tug on it and entrain some of its moisture.

Looks like Issac is moving almost due west right now...

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Damn.. Michigan misses out..

Another 2 weeks of nothing. I got less then a hundredth of an inch the other night.

Sent from my ADR6425LVW 2

This area probably won't get any of the widespread/heavy stuff folks want as it'll be weakening (which is actually a good thing for areas that have been flooded out recently), but the tropical moisture and what's left of Isaac will eventually get here.

I'm certainly not expecting severe weather either with the lack of shear and the warm cloud depths, but wet microbursts (which can drop a lot of water fasts) are certainly a possibility.

In any event, here's some interesting observations I found out of New Orleans...

KNEW 290153Z 04040G58KT 3/4SM -SN BKN018 OVC023 A2939 RMK AO2 PK WND 04058/0145 SLP947 P0045 FZRANO

KNEW 290053Z 03041G52KT 3/4SM -SN BKN024 BKN028 OVC035 A2940 RMK AO2 PK WND 03057/0006 SNB17 SLP951 P0025 FZRAN

I'm also noticing a lot of people are mentioning Ike in this thread. That one was really a different animal, as it phased with a fairly strong northern stream shortwave. Isaac on the other hand looks to be cut off completely from the northern stream, at least as things stand right now.

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That's climo pretty much. LOT mentioned 17 remnant storms have passed within 100 miles since 1898 and they are usually moving east or northeast by then. I wouldn't be surprised if the number is lower for Milwaukee.

Yep, really the only weather event we do well with are winter storms, luckily (knock on wood). A 6" storm is almost inevitable every year, even last year, although that's for another thread. I know we don't do well with tropical cyclone remnants, but I was hoping it would happen once.

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Yep, really the only weather event we do well with are winter storms, luckily (knock on wood). A 6" storm is almost inevitable every year, even last year, although that's for another thread. I know we don't do well with tropical cyclone remnants, but I was hoping it would happen once.

No argument there!

Skilling showed the low on the RPM going up to Keokuk, IA before heading more ENE towards LAF. Heaviest rain from my neck of the woods - south. Looked like in excess of 3" for Chicago. I think for Milwaukee to get significant rain it would take a low tracking up to the Quad Cities to get the rain shield to your latitude.

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No argument there!

Skilling showed the low on the RPM going up to Keokuk, IA before heading more ENE towards LAF. Heaviest rain from my neck of the woods - south. Looked like in excess of 3" for Chicago. I think for Milwaukee to get significant rain it would take a low tracking up to the Quad Cities to get the rain shield to your latitude.

Yeah, the almighty DGEX was that solution, but given it's the only one I've seen so far with the low getting well into Iowa, it is probably well off.

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If the NAM on something or might this model be legit - taking the low center west through 42 hours and making landfall south of Lake Charles! Even wanders it over to Port Arthur, TX.

NAM_221_2012082900_F42_WSPD_10_M_ABOVE_GROUND.png

It looks like it should hug the coast for many hours yet. Whether it's as long as that, who knows. I think we're pretty much in nowcast mode. Wild storm for Louisiana...

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Looks to pound LAF pretty nicely. North of I-80 gets the shaft. Back and forth we go.

EDIT: My gut feeling is we won't see anything from this here. It usually takes a fast moving system to impact areas this far northwest. The slow movement of this storm will give the trough more time to sweep in and eject it eastward. Indiana and Ohio are much more favored considering climo as well.

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