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Area Forecast Discussion
Issued by NWS Springfield, MO
Issued by NWS Springfield, MO
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968 FXUS63 KSGF 281742 AFDSGF Area Forecast Discussion National Weather Service Springfield MO 1242 PM CDT Fri Jun 28 2024 .KEY MESSAGES... - Severe storms possible (30-60% chance) tonight into Saturday morning north of I-44. high winds and large hail will be the main concerns, but confidence is limited and coverage may be sparse. - Hot today but especially tomorrow. Heat Index values Saturday up to 110 south of I-44. Heat Advisory may be needed. - A break from the heat Sunday with a quick return to hot and humid conditions early next week. && .SHORT TERM /THROUGH SATURDAY/... Issued at 302 AM CDT Fri Jun 28 2024 Convection is moving east across Kansas this morning as part of a complex surface setup that extends all the way into Canada just north of Montana. Thanks to a lack of instability, this activity is not expected to survive into southwest MO, and if it does it will be harmless thunderstorms that quickly brush our northwesternmost counties. The approach of the front is bringing increasing high cloudcover, however, so we will see partly sunny conditions for much of the day with the fewest clouds during the last couple of hours of daylight. Highs will be in the 90s with Heat Index values largely in the mid 90s with spotty values up to 105 in the southwest toward the tri-state area. More widespread rain chances are on the way tonight and early Saturday morning. Deep troughing to the north will extend through the Ozarks into a favorable enough environment, with MLCAPE up to 2500 J/Kg and CIN up to -200 J/Kg. Models aren`t handling this well, and show every solution from a large bowing system to a thin line to nothing at all. However, as Saturday progresses, instability will increase and more support from an inverted trough to the southwest increases the potential for and confidence in more widespread activity later in the day Saturday and into Saturday night. Due to the uncertainty and potential for limited coverage, PoPs max out around 50% for this event. That being said, the Storm Prediction Center has included areas north of I-44 in a Marginal and Slight risk (1-2/5) for severe thunderstorms. As mentioned, instability will be on the increase throughout the day (up to 3500 J/Kg) before the warm front to the south lifts through, which will usher in ample moisture and moderate lift. Winds will be veering near the surface, and up to 45 kts of deep layer shear may be present. This environment will allow for semi-discrete supercells capable of producing damaging winds, potentially hail, and maybe even tornadoes. Again, this threat is maximized/limited to areas north of I-44, and is still a bit murky in terms of confidence. This is a "possible but not guaranteed" sort of situation. We`re caught in the middle of two separate systems, and how they interact and evolve as well as how early day convection plays out will all change the outcome of the evening event. Hopefully, models come into better agreement today and the synoptic pattern becomes a little less chaotic. The WPC follows the SPC almost exactly with Marginal and Slight (1- 2/4) risks for excessive rainfall north of I-44. Soils are quite saturated and PWATs are off the charts, so this will certainly be possible depending on precipitation coverage. Sub- severe winds may be able to cause damage given the saturated soils. If that wasn`t enough, Saturday will also be very hot (which is sort of why we`re in this situation). Heat Index values will be around or over 100 with widespread values over 105 south of I-44. A Heat Advisory may be needed for these areas and would be issued later today if deemed necessary. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... Issued at 302 AM CDT Fri Jun 28 2024 Precipitation may be ongoing through Sunday morning but will exit south into AR. Sunday won`t be as hot, with highs in the 80s and Heat Index values only a few degrees hotter. Enjoy it while you can, though, because high pressure and ridging build back in early next week. Heat Index values Monday will range from 90-100 while values on Tuesday will soar up to 110. If these trends continue, heat headlines may be needed. Wednesday and Thursday don`t look much better. Precipitation chances return mid- to late-week as another trough moves through behind the ridge. PoPs are currently <50% overall, but are widespread over several days. We keep getting put in these situations where we`re mainly experiencing the effects of ridging (hazardous heat) but the incoming trough and shortwave energy extend just far enough south to bring precipitation chances despite the high pressure. So, the cycle continues next week. && .AVIATION /18Z TAFS THROUGH 18Z SATURDAY/... Issued at 1231 PM CDT Fri Jun 28 2024 Cloud cover left over from overnight storms across eastern Kansas and northern Missouri will linger today across the region. Some breaks in the clouds will occur but at least as coverage is expected to remain mainly scattered at and below 20-25kft. Surface winds will be southerly and gusty at times to 20-25kts. A storm system is forecast to moving into the region overnight (around/after 06z) and bring the potential for thunderstorms and lower ceilings and visibilities. While storms are possible, the lack of some ingredients for widespread storms limits confidence and coverage. In advance of the system, low level winds across far southern Missouri and the KBBG terminal will produce LLWS from 07-12Z. && .CLIMATE... Issued at 302 AM CDT Thu Jun 27 2024 Record High Temperatures: July 2: KSGF: 100/1933 KJLN: 103/2011 July 3: KSGF: 98/2011 KJLN: 100/2011 Record Low Temperatures: July 1: KVIH: 56/1951 Record High Minimum Temperatures: June 29: KSGF: 80/1936 July 2: KSGF: 76/1933 July 3: KSGF: 77/2018 July 4: KSGF: 78/1901 && .SGF WATCHES/WARNINGS/ADVISORIES... KS...None. MO...None. && $$ SHORT TERM...Nelson LONG TERM...Nelson AVIATION...Hatch CLIMATE...Nelson