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Feb 23-24th Winter Storm Part 2


Chicago Storm

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everything seems to be going close to what was expected for now.

convective-ish elements are present down around GBG/MQB, with a rapidly developing/intensifying area of snow along and north of I-80 in E. Iowa/NW. Illinois (including some nice meso scale banding). this will all move intot he LOT CWA over the next few hours.

earlier call of 2-7" along/north of I-80 looks good (localized high amts). still think the heaviest axis will be from Lee to Cook Co...but the given that the earlier FGEN band overproduced up north, the axis might have to be expanded up there too.

lol.. cover them bases jojo.

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Snow beginning to mix in with the rain now as the heavier mesoscale band moves in. First flakes since about 5pm. Lets see if we can get a full changeover.

The ground is obviously very wet, with large puddles all over from all the rain today (0.34"). Can't wait to see this muddy looking landscape turn white over the next hour or two.

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This storm is really starting to suck. Even with heavier precip moving in it is still raining here. The last thing I was expecting was snow all afternoon followed by rain all evening.

Must be a residual shallow layer of warm air just off the surface. With the vort moving in I can't see it staying rain there very much longer at all.

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I'm very confident that DTX, and GRR will be shaving warnings off the southern end of their CWAs. I've been up all night following this storm, and I'm tired. I'm convinced we won't be seeing much. I was hoping to stay up, and see some decent thundersnow, but now it doesn't look likely. will have to go with 1-3" south of I-696, 4-8" between I-696, and I-69 with locally heavier amounts. Time to call it a night folks. Good night.

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Moisture to the SW working it's way into SEMI... Should be all snow north of 696.

Yup can't write this thing off until at least 6z. Radar filling in nicely over IN/OH and wetbulbs all at 34 or below over S. Mich. so S. MI should be all snow this next round. Dryslot over IL though will do it's magic :axe:

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Must be a residual shallow layer of warm air just off the surface. With the vort moving in I can't see it staying rain there very much longer at all.

Down to 32° in your town I see.

There's a shallow warm layer here, but it is snowing. Been bouncing between 32.8-33.8°.

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while the banding on radar looks good here, its sleet- not snow. ground is getting a nice coating of sleet as we speak. warm layer aloft has been hanging tough all evening and causing sleet or sleet/rain mix to continue. I don't see this ending well around here in terms of accumulations. Looks like North of Highway 30 in Iowa and just West of the Mississippi River (Maqouketa/Dubuque/De Witt/Clinton) is going to maybe be a jackpot zone.

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Yup can't write this thing off until at least 6z. Radar filling in nicely over IN/OH and wetbulbs all at 34 or below over S. Mich. so S. MI should be all snow this next round. Dryslot over IL though will do it's magic :axe:

Should get interesting between 11pm - 2am. Could be quick 2"

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Good indepth update from DTX.

.UPDATE...

IN THE VERY SHORT TERM, NO CHANGES ARE EXPECTED IN THE TIMING OR

COVERAGE OF HEADLINES. FORECAST ADJUSTMENTS WILL ADD A MIX OF

SLEET TO THE ACTIVITY NEAR THE OHIO BORDER UP TO ABOUT DETROIT

DURING THE NEXT 3 TO 6 HOURS. IN THE LONGER TERM, NORTHWARD

ADJUSTMENTS TO THE PLACEMENT OF HEAVIEST SNOW ACCUMULATION MAY BE

NEEDED, BRINGING THE TRI CITIES CLOSER TO A POTENTIAL WARNING

HEADLINE RATHER THAN AN ADVISORY.

CONVECTION INCREASING IN COVERAGE AND INTENSITY OVER NORTHERN

INDIANA AND OHIO AT PRESS TIME IS EXPECTED TO DEVELOP WESTWARD

TOWARD THE INFLUENCE OF THE STRONG MID LEVEL SHORT WAVE INDICATED

IN SATELLITE IMAGERY MOVING IN FROM IOWA. THIS WAVE WILL INDUCE

INTENSE SECONDARY SURFACE CYCLOGENESIS OVER INDIANA WHICH WILL

HOLD THE LOW LEVEL JET IN PLACE OVER LOWER MICHIGAN AND SUPPORT

STRONG SYSTEM RELATIVE ISENTROPIC ASCENT THROUGH HIGHER ELEVATIONS

OF THE FRONTAL ZONE. WITH SPECIFIC HUMIDITY ON THE 290K ISENTROPIC

SURFACE APPROACHING 4 G/KG, THE RESULT WILL BE CONTINUED NORTHWARD

EXPANSION AND INTENSIFICATION OF THE PRECIPITATION PATTERN INTO

THE EARLY OVERNIGHT HOURS ASSOCIATED WITH THE INTENSE MOISTURE

TRANSPORT AND RESULTING DESTABILIZATION. ANY REMAINING MIX OF

RAIN, SLEET, AND SNOW WILL BE FORCED OVER TO ALL SNOW BY THE

COOLING EFFECT OF HIGHER PRECIPITATION RATES. EVIDENCE OF THIS IS

ALREADY APPEARING UPSTREAM CLOSER TO THE NORTH FLANK OF THE

SURFACE LOW.

THE ABOVE REFERENCED MODE OF FORCING WILL DOMINATE THE FIRST

THIRD OF THE EVENT WITH ABOUT 1 TO 3 INCHES OF SNOW EXPECTED TO

RESULT THROUGH 3 OR 4 AM, MAINLY SOUTH OF INTERSTATE 69, AS THE

LOW PRESSURE SYSTEM APPROACHES THE REGION. AS THE SYSTEM MOVES BY

TO OUR SOUTH AND EAST, ISENTROPIC ASCENT WILL TRANSITION TO A

CONSIDERABLY MORE DYNAMIC TROWAL PATTERN CAPABLE OF EVEN MORE

INTENSE RATES OF SNOWFALL. THIS IS EXPECTED TO BE THE BULK OF THE

REMAINING EVENT THAT WILL LAST FROM LATER IN THE NIGHT THROUGH

MID TO LATE FRIDAY MORNING AND WILL BRING THE LARGEST CONTRIBUTION

TO SNOWFALL TOTALS. UNFORTUNATELY, THAT MEANS THE PEAK OF THE

EVENT WILL BE ONGOING THROUGH THE FRIDAY MORNING TRAVEL PERIOD.

THIS IS ALSO THE MOST DIFFICULT PART OF THE FORECAST IN TERMS OF

IDENTIFYING THE PLACEMENT OF THE MOST INTENSE BAND AND POTENTIAL

IMPACTS OF THE DRY SLOT MAKING A RUN INTO THE DETROIT AREA BY

SUNRISE. INCOMING 00Z MODEL DATA SUPPORTS THE TROWAL AXIS

SETTING UP A LITTLE FARTHER NORTH, ROUGHLY ALONG A LINE FROM

LANSING TO BAD AXE, WITH A SHARP GRADIENT IN ACCUMULATION

SOUTHWARD THROUGH DETROIT TO THE OHIO BORDER. EXPECTING THE MOST

INTENSE MESOSCALE BAND TO SET UP ROUGHLY BETWEEN THE TROWAL AXIS

AND THE LEADING EDGE OF THE DRY SLOT THAT MARKS WHERE CONVECTIVE

INSTABILITY WILL BE MAXIMIZED, OR ROUGHLY ALONG A LINE FROM HOWELL

TO LAPEER TO PORT SANILAC.

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