From the NWS:
.SHORT TERM /Tonight through Friday Night/... Issued at 144 AM EDT Wed May 8 2019 Active weather appears in storm tonight and Thursday. The GFS and NAM suggest a strong short wave pushing toward Indiana within the quick SW flow aloft. Best forcing looks to arrive after 06Z. Meanwhile at the surface Low pressure surges northwest of Indiana and the associated LLJ develops across Indiana ahead of the low...reaching a moderate 40+ knots. Meanwhile within the mid levels favorable moisture appears present and Time sections and forecast sounding all show deep saturation by 12Z. Thus will trend toward categorical pops late tonight and early on thursday as these features pass. Forecast soundings show limited instability and although a rumble of thunder will still be possible...widespread thunderstorms arent expect late tonight or on early thursday. Bad diurnal timing will also plague instability development. Frontal passage is suggested to occur Thursday evening...but the bulk of any moisture and forcing will be well ahead of the surface front...and any heating ahead of the front should be limited by the rain expected during the day. Aloft...the GFS and NAM suggest a weaker short wave to pass overnight while lingering and limited lower level moisture remain near the front. We will need to keep some small chances on Thursday night and early friday as these features pass...however with limited moisture at this point any precip amounts will be small. By Friday afternoon and Evening forecast soundings dry out considerably as strong high pressure builds across Indiana. As For temps will trend warmer on Wednesday night with expected precip and cooler on Thursday through Friday with expected rainfall and cold air advection as high pressure builds across the region. && .LONG TERM /Saturday through Tuesday/... Issued at 329 AM EDT Wed May 8 2019 An upper wave approaching on Saturday will bring in some chances for showers to the southern counties by Saturday afternoon as a surface front remains between the Ohio and Tennessee valleys. Stronger upper forcing will move in Saturday night and bring rain chances across the area, but lack of instability should mean showers and not thunderstorms. Chances will hang around most of the area through Sunday morning as the surface system is slow to move out, but by Sunday afternoon surface high pressure should start building in and bring rain to an end. Small chances for showers could move back in on Tuesday from the north if the surface high gets shoved southward. Temperatures should be below normal through much of the long term with upper troughing transitioning to northwesterly upper flow. Near normal temperatures could return for Tuesday.
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