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Area Forecast Discussion
Issued by NWS Goodland, KS
Issued by NWS Goodland, KS
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115 FXUS63 KGLD 061641 AFDGLD Area Forecast Discussion National Weather Service Goodland KS 1041 AM MDT Sat Jul 6 2024 .KEY MESSAGES... - Severe weather chances return for the weekend. All hazards are possible this afternoon starting around 1-2pm MT (2-3pm CT). Large hail and damaging winds will be the main threats. Along and east of Highway 25 is the favored area. - Showers and storms are forecast to linger over the area tonight and tomorrow. Most of these would be sub-severe, but would need to watch for an isolated hail threat. - A gradually warming, but overall tranquil, pattern is expected to move into the region starting early in the workweek. && .SHORT TERM /THROUGH SUNDAY NIGHT/... Issued at 420 AM MDT Sat Jul 6 2024 For the short term period, an active weather pattern is expected as a low pressure system develops and moves through the area today, followed by low level moisture return tonight into tomorrow. Observations continue to show clear skies early this morning. The clear skies are forecast to last through the early afternoon hours with the exception of maybe some patches of fog along and east of Highway 83 where dewpoint depressions are within a few degrees. This afternoon, drier air is forecast to move in from the west associated with the low and a dryline while a warm front drapes across NW Kansas and SW Nebraska. Behind the dryline, dewpoints could fall into the 30`s and allow RH to dip into the teens, especially with high temperatures nearing 90. Briefly critical fire weather conditions are possible in Eastern Colorado, but the center of the low is forecast to keep the winds a bit lower while RH is at its lowest. For the rest of the area ahead of the dryline, storms will be possible starting around 1-2pm MT (2-3pm CT). With current forecasted parameters of MLCAPE around 1500 J/KG and DCAPE, effective shear around 45 kts, and DCAPE greater than 1000 J/KG, large hail and damaging wind gusts will be possible. Storms are forecast to congeal along the boundaries fairly quickly which will help keep the hail threat limited below 2". However, any initial supercell could produce hail up to 3" based on sounding analogs. As the storms congeal and move east/southeast, the wind threat will become more likely. Based on prior events and forecast corfidi downshear around 45-55 kts, I`m not too concerned for wind gusts above 70 mph and would expect most gusts to be around 45-65 mph. As for tornadoes, there is the possibility for landspouts along the dryline with higher storm bases and very steep low level lapse rates and instability. For the tornado threat as a whole though, low level shear and SRH are forecast to be fairly weak unless storms modify the environment, so the only concern is mainly near the triple point if a supercell can get going. The dryline and storm initiation is currently forecast to be from McCook to Sharon Springs, but severe weather looks to favor Highway 25 and east. Can`t rule out storms to the west, but chances are fairly low if the dryline advances as forecast. There is a very low chance around 5-10% of the dry air pushing too far east and killing most of the afternoon storm chances. Tonight, a brief reprieve is forecast as the line of storms exits the area during the early evening hours. However, storms are forecast to rebuild into the area as the low level flow turn to our of the south and east, allowing moisture to advect back into the area. If the flow is more from the south, storms may be limited to the eastern half of the area as dry air may get pulled in as well. But otherwise storms should form with the trough axis swinging through and the area remaining in northwest flow with the additional moisture. MUCAPE could reach 1500 J/KG and midlevel lapse rates near or slight exceed 8 C/KM, but similar patterns here recently suggest an isolated quarter to half dollar sized hail threat with heavy rain being more likely. Will have to watch for flooding if storms train over any area, otherwise downshear vectors look to be too high for a single storm to produce flooding. Lows will range in the 50`s to 60`s depending on storm coverage. Tomorrow, the upper trough axis is forecast to continue to slowly rotate through the area and to the east. With the continued northwest flow and moisture availability, showers and storms could linger into the early afternoon hours when the moisture should begin to shift south out of the area. If the showers and storms break during the morning hours, that could allow some heating to generate some additional instability and allow for an isolated storm or two to develop and produce severe hail. Otherwise, the area will be mostly cloudy through the day with sub-severe showers and storms with highs generally in the 70`s. Tomorrow evening and night, will need to watch for additional showers and storms from off the Palmer Divide with continued northwest flow. As long as there is prior cloud cover and storms, the evening round of storms should be sub-severe and would likely impact just Eastern Colorado and adjacent counties. && .LONG TERM /MONDAY THROUGH FRIDAY/... Issued at 201 AM MDT Sat Jul 6 2024 We look to begin the long-term under an upper-level trough stretching from Minnesota, through eastern Colorado, down into New Mexico. As the week progresses, a high pressure system over the Four Corners region will strengthen as the trough looks to stall out over the Upper Mississippi River Valley. This will set us up for northwesterly flow aloft. In the lower-levels, the 850mb LLJ will be blocked by TS Beryl, limiting low-level moisture entering the region. These two features will lower our chances of organized precipitation. However, lingering mid-level precipitation and any mid-level shortwaves that come off the Rockies will give us a slight chance of showers and thunderstorms in the afternoon and evening hours. Temperatures in the long-term will follow a warming trend. Monday looks to warm only into the lower 80s with Tuesday warming up to near 90. The reason for such a strong jump in temperatures will be the trough axis passing through the area. The warming slows down a bit after Tuesday, but by Saturday temperatures are expected to warm into the upper 90s. Triple digit heat cannot be ruled out for next weekend, but confidence is not yet very high. Low temperatures follow a similar trend with lows Monday night cooling into the 50s, but by Friday night, temperatures will remain in the 60s. && .AVIATION /18Z TAFS THROUGH 18Z SUNDAY/... Issued at 1040 AM MDT Sat Jul 6 2024 For KGLD, main focus for the forecast period will be the passage and setup of a dryline into the area. Looking for the 19z-21z period to have VCTS chances, then VFR. By 12z Sunday as moisture returns, MVFR/VFR ceilings ensue, especially from 12z-15z Sunday. Some light rain is possible. Winds, west- southwest from 18z-20z at 15-25kts, then shifting north- northwest around 15kts. By 12z Sunday, east-southeast around 10kts. For KMCK, main focus for the forecast period will be the passage and setup of a dryline into the area. Looking for the 20z-22z period to have VCTS chances w/ MVFR showers, then VFR. Winds, west-southwest from 18z-21z at 15-25kts, then shifting northwest around 15-25kts. By 22z becoming east 10-20kts, then east- southeast 5-10kts from 05z Sunday onward. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...None. CO...None. NE...None. && $$ SHORT TERM...KAK LONG TERM...CA AVIATION...JN