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Area Forecast Discussion
Issued by NWS Dodge City, KS
Issued by NWS Dodge City, KS
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338 FXUS63 KDDC 150456 AFDDDC Area Forecast Discussion National Weather Service Dodge City KS 1156 PM CDT Sun Jul 14 2024 .KEY MESSAGES... - Intense afternoon heat will continue Sunday and Monday. - Scattered showers and thunderstorms are expected Tuesday night. Locally heavy rainfall and marginally severe storms are possible. - Much milder, more comfortable temperatures are expected Wednesday. && .DISCUSSION... Issued at 200 PM CDT Sun Jul 14 2024 Midday infrared satellite imagery showed only a few clouds drifting over SW KS, with strong subsidence on the eastern periphery of a strong 598+ dm midlevel ridge centered near the Four Corners. Surface analysis showed a distinct boundary and accompanying wind shift bisecting SW KS, with light northeast winds north and west of DDC. Models allow this boundary to wash out through peak heating, but the lack of downslope will likely keep temperatures several degrees "less hot" than forecast for this afternoon. Clear and quiet tonight, under strong high pressure aloft, with scattered cirrus increasing toward sunrise Monday. Light S/SW winds will prevail, with all locations holding in the lower 70s through sunrise. Monday may very well end up being the hottest day of the summer. Models depict SWly downslope compression, enhancing already super hot 850 mb temperatures as high as 35C. 12z GEFS ensemble members show near 100% probability of 2m surface temperatures over 100 across all zones, and NBM is plenty hot, with afternoon temperatures of 104-108. If it wasn`t for all of the recent rainfall and resultant vegetation/evapotranspiration, many locations would reach 109-110 Monday afternoon. Still, even with the greenery, some locations will approach record heat levels. The record high at DDC for July 15 is 109 (2022), and the forecast will carry of a high of 106. This will be a relatively dry heat with dewpoints in the 50s; as such, heat indices will be held less than 105 about west of US 283, and 105-110 eastern zones. For simplicity, just kept the inherited heat advisory going all zones through Monday afternoon. Temperatures this hot are dangerous regardless of specific heat index criteria. The heat will finally relax Tuesday, as winds trend NEly behind an initial cold front. Still hot, but the 100-105 will be replaced with 90s. With the added easterly boundary layer component, a noticeable increase in humidity is expected, with dewpoints will into the 60s. So although "cooler", it may actually feel more uncomfortable for more people. A weak shortwave will dent the eastern periphery of the ridge some more Tuesday night, maintaining moisture influx on northeast/east winds. Guidance has been consistent on scattered showers and thunderstorms during the Tuesday night time frame, with potential MCS development most likely from NE Colorado to central Kansas. NBM pops are in the chance to likely category Tuesday night, favoring the northern zones, and these were accepted. 12z GEFS ensemble members already suggest a 70% probability of QPF > 0.10 inch across much of SW KS Tuesday night, and locally heavy rainfall is probable. Up to 1 inch of rain is a distinct possibility especially given an organized MCS. Marginally severe outflow winds may become a risk from any organized linear convective system, per SPC Day 3 marginal probability. Heat relief will become much more obvious Wednesday, as outflow and cool advection on northeast winds are enhanced by any departing MCS. With 850 mb temperatures reduced to near 20C, afternoon temperatures will be pleasantly reduced to the lower to mid 80s. Thursday through Saturday, 12z global models and their ensembles are in excellent agreement that the heat will not be allowed to return to SW KS through the remainder of the week. During this period, a meridional amplified flow is forecast across North America, with the hot upper ridge finding a home over the Great Basin, well west of SW KS. The resulting N/NWly flow aloft will ensure afternoon temperatures remain pleasant, in the 80s, as shown by the latest iteration of the NBM, and 12z MEX guidance. && .AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 1156 PM CDT Sun Jul 14 2024 Decaying convection over the southeast Colorado counties has produced a convective outflow boundary that should reach the GCK airport between about 0515 and 0530 UTC. Post frontal winds were north between 26 and 40 knots, and momentum is naturally expected to wane significantly. Dissipating mid level clouds this afternoon will be coupled with light westerly surface winds as an overall high pressure regime aloft remains in place. By the evening hours, or between 23 and 01 UTC, surface based thunderstorm development is possible (10-20% areal coverage, along a prefrontal trough over nw Kansas, potentially reaching the Garden City to Hays corridor in the pre sunset hours Monday evening. Predictability is too low for any prevailing mention in TAF, and marginal as well to even call it in the vicinity at this time. && .DDC WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 7 PM CDT /6 PM MDT/ Monday for KSZ030-031- 043>046-061>066-074>081-084>090. && $$ DISCUSSION...Turner AVIATION...Russell