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sbnwx85

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  1. 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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  2. 9 minutes ago, WestMichigan said:

    Models really want to wind something up the first week of March.  Only 8 more days to go before it turns into a shell of its original self and someone gets 6" or less.

    Just posted about that in the medium/long range thread. Trying to reel it in for us. It's probably our last hope before "spring". 

  3. Tornado Watch up for the southern half of Illinois and Eastern Missouri. 

    WW0041 Radar

    SUMMARY...A broken line of storms is expected to intensify and race
       northeastward and pose a damaging wind and tornado risk,
       particularly in vicinity of a warm front from near/north of the St
       Louis area into south-central Illinois.
    • Like 3
  4. My backyard thermometer just went from 30 to 31 at 7 am. I’ll assume it was about this temperature while the moderate to heavy freezing rain moved through last hour. The parking lots and grass were only wet but everything else was covered in ice. Trees, cars, fences, etc. It seemed to accrue somewhat efficiently just above the ground. You’ve been alerted, Michigan posters. Good luck.

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  5. 16 minutes ago, Hoosier said:

    18z HRRR got some ice down into the I-80 corridor tomorrow morning. 

    There will be some dry air to play with early on (dews in the 20s) and precip onset seems to be speeding up, so I guess you never know.

    Look at what the HRRR puts down before temps go above freezing for my area. 

    image.thumb.png.9ab052bff78e39f4d32738e6d0e12f61.png

    Edit: And here's the entire run...FWIW

    image.thumb.png.a148ee6f0aabc39cb4e0a0db8d77a386.png

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