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  • MESO: Mesoscale Discussion 2073

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Dec 29 03:45:00 2022
    ACUS11 KWNS 290344
    SWOMCD
    SPC MCD 290344=20
    COZ000-290645-

    Mesoscale Discussion 2073
    NWS Storm Prediction Center Norman OK
    0944 PM CST Wed Dec 28 2022

    Areas affected...North-central to east-central CO

    Concerning...Heavy snow=20

    Valid 290344Z - 290645Z

    SUMMARY...A swath of heavy snow with rates around 2 inches per hour
    will continue to move east from the I-25 to the I-70 corridor in
    east-central CO before diminishing overnight.

    DISCUSSION...Traffic cams, storm reports, and surface observations
    confirm the presence of a heavy snow band along the foothills to the
    I-25 corridor in the greater Denver-Boulder metro area. Here,
    surface temperatures have been able to cool to 32-33 F, maximizing
    snow rate efficiency as nearly the entire column has gone below
    freezing within a persistent low-level upslope flow regime. This
    period of heavy snow will likely continue for a couple more hours
    before shrinking in areal extent (and overall intensity) after 06Z
    as low-level winds shift to the northwest in the wake of shortwave
    trough passage.

    ..Grams.. 12/29/2022

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!9rIsExbwYzYdKu55nJXEwECBRdzo_D-Ef-J6hGhb4VemM_6fyV1qCf1YYvLdt32ZL3mwUyxxh= _96FcNCpD0_b1X4AdI$ for graphic product...

    ATTN...WFO...PUB...BOU...

    LAT...LON 39720560 40210562 40540542 40520473 39820385 39420355
    39220350 38980379 38740446 39030485 39290526 39480553
    39720560=20


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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Sep 1 02:42:59 2023
    ACUS11 KWNS 010242
    SWOMCD
    SPC MCD 010242=20
    AZZ000-010515-

    Mesoscale Discussion 2073
    NWS Storm Prediction Center Norman OK
    0942 PM CDT Thu Aug 31 2023

    Areas affected...south-central AZ

    Concerning...Severe potential...Watch unlikely=20

    Valid 010242Z - 010515Z

    Probability of Watch Issuance...5 percent

    SUMMARY...Widely scattered severe gusts (60-70 mph) are possible in south-central AZ through the late evening (05 UTC) as an organized
    linear thunderstorm cluster slowly moves northwest. Upon
    coordination with NWS Phoenix, a small severe thunderstorm watch
    will not be issued due primarily to the small spatial/temporal
    nature of the severe-wind threat.

    DISCUSSION...Radar mosaic shows a linear cluster of thunderstorms
    over southern AZ moving slowly northwest across the Sonoran Desert
    this evening. The 22 UTC 1Y7 (Yuma) raob did sample the
    moisture/buoyancy reservoir that increases from east to west across
    southern AZ. The 00 UTC Tucson and Phoenix raobs showed very steep
    lapse rates from the surface to 500 mb. Although diurnal heating
    has abated, hot conditions persist with temperatures near 100 deg F
    northwest of the ongoing storms as of 0240 UTC. The Pinal Airport
    AWOS (KMZJ) recently measured a 50-kt gust at 0150 UTC with this activity.=20=20

    The KIWA VAD (Phoenix 88D) has shown a strengthening in
    southeasterly flow around 500 mb (less than 5 kt to 30-35 kt). This enhancement in mid-level flow was observed subtly on the KEMX VAD
    (Tucson 88D) and the 00 UTC Tucson raob. Given the organized
    character of the linear thunderstorm cluster, expecting the enhanced
    belt of mid-level flow and cold pool organization to aid in this
    activity to slowly move into the greater Phoenix vicinity over the
    next few hours. The stronger downdrafts will probably be capable of
    severe gusts (60-70 mph).

    ..Smith/Grams.. 09/01/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!_nkgOHuQjPUpzMmZfjYYQzVjKlA6hLVENmqe4Odia0xiwzLnzKIDeqLGkv2llmu26kFhpKxLU= 5KiZ3gy6upVkb41M6E$ for graphic product...

    ATTN...WFO...TWC...FGZ...PSR...

    LAT...LON 32251308 32801359 33291358 33711323 33861275 33891207
    33631153 33111109 32971123 32901185 32641243 32321276
    32251308=20


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