• MESO: Mesoscale Discussion 0278

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Mar 12 08:21:07 2023
    ACUS11 KWNS 120821
    SWOMCD
    SPC MCD 120820=20
    ALZ000-MSZ000-120915-

    Mesoscale Discussion 0278
    NWS Storm Prediction Center Norman OK
    0320 AM CDT Sun Mar 12 2023

    Areas affected...Eastern Mississippi...Western Alabama

    Concerning...Severe potential...Watch possible=20

    Valid 120820Z - 120915Z

    Probability of Watch Issuance...40 percent

    SUMMARY...The wind-damage threat may continue to the southeast of WW
    66 as a line of storms moves into eastern Mississippi over the next
    couple of hours. The threat is expected to become more isolated, but
    weather watch issuance remains possible to the southeast of WW 66.

    DISCUSSION...The latest radar imagery from Jackson shows a
    continuous line of storms across northwestern Mississippi, with a
    large-scale bowing structure. This line is located along the
    northern edge of a moist and unstable airmass with MLCAPE generally
    around 500 J/kg according to the RAP. This line is being supported
    by a 40 to 50 kt low-level jet, and a subtle shortwave trough
    evident on water vapor imagery. As the line moves southeastward, it
    will continue to encounter weak instability, with low-level flow
    becoming slightly more veered. This may result in a gradual
    weakening trend over the next few hours. However, a lingering threat
    for isolated wind damage should remain, especially if the line can
    remain somewhat organized.

    ..Broyles/Guyer.. 03/12/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!7s08FDWM222ft5Mj1OEgCNY_ImP97okdlIoDObNBUng2SmPqKwat6mp3AMsw_fL7gNBLip6Kg= 0_n88ChXgdhhKERp2k$ for graphic product...

    ATTN...WFO...BMX...MOB...JAN...

    LAT...LON 33198842 33348909 33128966 32749004 32389003 32138972
    31638901 31248838 31318791 31588758 32138746 32718771
    33198842=20


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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Mar 22 03:46:50 2024
    ACUS11 KWNS 220346
    SWOMCD
    SPC MCD 220346=20
    WIZ000-MNZ000-220645-

    Mesoscale Discussion 0278
    NWS Storm Prediction Center Norman OK
    1046 PM CDT Thu Mar 21 2024

    Areas affected...portions of east-central Minnesota into central
    Wisconsin

    Concerning...Heavy snow=20

    Valid 220346Z - 220645Z

    SUMMARY...A few instances of 1+ inch/hr snowfall rates are possible
    over the next few hours.

    DISCUSSION...A 500 mb jet streak is overspreading the Upper MS
    Valley, supporting strong low-level warm-air advection within a
    sub-freezing troposphere. As a result, 700 mb frontogenesis is
    increasing along the MN/WI border, boosting deep-layer ascent within
    a deepening dendritic growth zone. Multiple surface observations
    have recently shown heavy snow ongoing across Sherburne to Chisago
    Counties in Minnesota. Additional instances of heavy snow are likely
    along the 700 mb frontogenesis axis over the next few hours, with 1+
    inch/hr snowfall rates and instances of reduced visibility possible.

    ..Squitieri.. 03/22/2024

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!4Ba-MmzKWh8Kfb1pgSh3ozNyL7BL0w8ro3qYyU5sK0BTUPh9FDcsezN3DiudlGCO9VxYL6IsR= kSxfJQR24I55uvlMto$ for graphic product...

    ATTN...WFO...GRB...ARX...MPX...

    LAT...LON 45549426 45609255 45239024 44578849 44328835 44098865
    44108963 44229088 44579227 44959342 45249443 45549426=20


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