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February 21-23 Major Winter Storm


Hoosier
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2 minutes ago, michaelmantis said:

The temp where I'm at in N IL is overing between 31/32. It's rain now, icing up on some areas. One of those situations where a degree down would make a huge (bad) difference. 

We look to be at the low for the day (31/32) and fingers crossed it doesn't drop a degree or two. It would get bad very fast.

Been holding at 31.7 on my backyard station since 7am. Any drop will not make things any better. Only positive is that it is raining heavier now which has slowed the accretion a bit. 

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Had some pretty hard rain. Flash flooding possible tonight.

Graphic for MPD #0072

Mesoscale Precipitation Discussion 0072
NWS Weather Prediction Center College Park MD
433 PM EST Wed Feb 22 2023

Areas affected...central/northern IL into northern IN,
northwestern OH and southern MI

Concerning...Heavy rainfall...Flash flooding possible

Valid 222130Z - 230330Z

SUMMARY...Heavy rain will continue a threat for flooding from
central/northern IL into northern IN and extreme northwestern
OH/southern MI. Peak rainfall rates of just over 1 in/hr will
allow for an additional 1 to 2 inches of rain through 03Z, but
rainfall intensity is expected to decrease with time.

DISCUSSION...Regional radar imagery at 21Z showed a broad shield
of precipitation extending to the north and northeast of a surface
low analyzed over central IL. Localized reports of 1+ in/hr have
occurred across portions of central IL over the past few hours
where the SPC mesoanalysis indicated MUCAPE near 100 J/kg and
precipitable water values of 1.2 to 1.4 inches. MRMS and gauge
reports indicated 1 to 3 inches of rain has fallen over the past
12 hours from central IL into north-central IN. Across far
northern IN/OH into southern MI, surface temperatures near 32 have
supported areas of freezing rain with the freezing line expected
to only marginally lift north over the next few hours.

As a negatively tilted shortwave over the mid-Mississippi Valley
continues to advance northeastward, it is expected to maintain a
weakening trend and support the ENE track of the surface low over
central IL toward northwestern OH. South-southwesterly 850 mb
winds of 50 to 60 kt just ahead of the shortwave and surface low
are expected to continue strong ascent over a well-defined warm
front extending eastward from the low. Elevated instability is
only about 100-200 J/kg according to the 20Z SPC mesoanalysis but
is forecast to gradually lower over the next 3-6 hours which
should reduce peak rainfall intensity to 0.5 to 0.75 in/hr beyond
00Z.

An additional 1-2 inches of rain is expected through 03Z, with
rainfall ending from west to east. Expected rainfall should near
area 3-hr flash flood guidance of 1 to 1.5 inches, but should
primarily lie north of the axis of heavy rain that has fallen over
the past 12 hours. Nonetheless, localized areas of flooding will
be possible, within a fairly narrow corridor between the warm
front and frozen precipitation to the north over southern MI.

Otto
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3 minutes ago, Chicago Storm said:

Based on pictures I've seen, even with borderline temps and heavy rates, ice accrual has been fairly efficient across portions of Northern Illinois.

I have a Birch tree covered with ice that if we get a few gusts or sustained winds I'm afraid it may fall. Leaning a good deal. About to head out and the roads themselves look ok. River of water through the backyard from the run off. 

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3 minutes ago, Chicago Storm said:

Based on pictures I've seen, even with borderline temps and heavy rates, ice accrual has been fairly efficient across portions of Northern Illinois.

Gotta think that dews staying 2-3 degrees below freezing (at least per ASOS sites) and the brisk winds have been helping the cause.

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31 minutes ago, mnchaserguy said:

I wouldn’t be surprised if we don’t hit double digit totals for the entire storm. Snow having a really hard time getting going on the north side.


.

Closing in on an inch imby from the main event. It’s coming down pretty good right now. What part of town are you in? I think 8-10” additional is probably what my side of town will see. 

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Closing in on an inch imby from the main event. It’s coming down pretty good right now. What part of town are you in? I think 8-10” additional is probably what my side of town will see. 

I’m up in Blaine. We missed the bigger bands yesterday and the current band seems to be drying up on the north side.


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