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  "path": "/products/md/md0643.html",
  "publishedAt": "2026-05-05T02:35:02.000Z",
  "site": "https://www.spc.noaa.gov",
  "tags": [
    "Read more"
  ],
  "textContent": "MD 0643 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR EASTERN ILLINOIS...FAR WESTERN INDIANA\n\n\n\n\n    Mesoscale Discussion 0643\n    NWS Storm Prediction Center Norman OK\n    0931 PM CDT Mon May 04 2026\n\n    Areas affected...Eastern Illinois...Far Western Indiana\n\n    Concerning...Severe potential...Watch unlikely\n\n    Valid 050231Z - 050430Z\n\n    Probability of Watch Issuance...20 percent\n\n    SUMMARY...An isolated large hail threat may continue across eastern\n    Illinois for a couple more hours, and could also affect far western\n    Indiana. The severe threat area should remain relatively confined,\n    and weather watch issuance is not expected.\n\n    DISCUSSION...The latest RAP has an axis of moderate instability\n    located from north-central Missouri east-northeastward into\n    Illinois, where MLCAPE is in the 1000 to 1800 J/kg range. Convection\n    has recently initiated along the far eastern edge of the stronger\n    instability in central Illinois. The storms are being supported by\n    low-level warm advection and may persist for a couple more hours.\n    Steep mid-level lapse rates and moderate deep-layer shear, evident\n    on regional WSR-88D VWPs, will likely support an isolated large hail\n    threat. However, instability drops off quickly with eastward extent,\n    suggesting that any severe threat should be relatively short-lived.\n\n    ..Broyles/Hart.. 05/05/2026\n\n    ...Please see www.spc.noaa.gov for graphic product...\n\n    ATTN...WFO...IWX...IND...LOT...ILX...LSX...\n\n    LAT...LON   39198698 38648798 38858862 39758912 40898904 41158774\n                40788697 39198698\n\n    MOST PROBABLE PEAK WIND GUST...55-70 MPH\n    MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN\n\n\n\nRead more",
  "title": "SPC MD 643"
}