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Area Forecast Discussion
Issued by NWS Goodland, KS
Issued by NWS Goodland, KS
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198 FXUS63 KGLD 130415 AFDGLD Area Forecast Discussion National Weather Service Goodland KS 1015 PM MDT Mon Aug 12 2024 .KEY MESSAGES... - Dense fog may return late tonight behind the rain. - Low confidence for severe weather occurring during the late afternoon/evening over the southwest quadrant of the forecast area. - Flood watch issued for East Central CO for tonight. - Potential for stronger storms Tuesday evening over the northwest quadrant of the forecast area. - Rain chances continue through most of the week and temperatures gradually warm. && .SHORT TERM /THROUGH TUESDAY NIGHT/... Issued at 232 PM MDT Mon Aug 12 2024 Latest upper air analysis shows the ridge still centered over the Desert Southwest. Rounding the ridge are smaller scale troughs. The short wave trough that will aid in storm development this afternoon is currently moving across Wyoming. Meanwhile cloud cover remains in place over much of the forecast area. This should cause a stabilizing factor regarding storm development later today. For the rest of today storm activity has already started over the western part of the forecast area. Here the environment will be unstable. However the environment becomes more stable toward the CO/KS border. Where this transition to a stable environment is will depend on where the cloud cover has had a chance to linger the longest. Tonight storm activity should begin to move into the forecast area ahead of the upper level short wave trough that has been approaching from the west. Latest data indicates the instability should decline toward the KS/CO border, but where exactly that occurs depends on the westward extent of the cloud cover today. Best assessment is the environment become more stable east of the first column of KS counties. Deep layer shear will be around 35 kts and instability will be around 2000 j/kg for MLCAPE. The limiting factor will be the lower shear, which is half of what it was yesterday. Also, the storms look to be in more of a cluster due to the mean flow being from a southerly direction; parallel to the mountains and dry line the storms will be forming off of. Since the storms will be in a group, and the shear is on the low end of the spectrum, am expecting the hail to be on the low end of the severe spectrum. The cloud bases will be rather low so the threat for severe wind gusts is on the low side unless the storms form a line. Once the storm activity moves into KS the severe threat should decline if it doesn`t already. On a side note, confidence is on the low side for severe weather to occur. The shear is rather weak and storms are favored to cluster together. The timing for storms moving into the forecast area is also not very helpful either since this will be after peak heating, which will lessen storm intensity. During the latter half of the evening and through the rest of the night a rather large area of rainfall should progress east across the forecast area. The GEFS and ECMWF ensembles do not agree with the placement of the best chance for rainfall, but both have rather high percentages for rainfall to occur. Even the HREF is showing higher percentages for rainfall tonight. Based the current flood watch on where the highest rainfall amounts would be from the HREF data. Confidence for flooding declines as the storms move east due to the storms moving faster as they progress east of CO later in the night. Tuesday morning there may be storm activity ongoing over the eastern half of the forecast area as the upper level short wave trough slowly moves eastward. This activity should be east of the forecast area before late morning. Fog may form behind the rain. Clouds should clear through the morning, allowing temperatures to be warmer than today. Later in the afternoon another round of storm activity will approach from the west, but not move into the forecast area until the evening. Tuesday night storm activity will move into the forecast area from the west. This short wave trough will be more potent than the one for tonight. Model data has the updraft for any potential storm being stronger than what may occur today. As such, am thinking this storm activity will be of greater intensity than today. The favored track is over the northwest quadrant of the forecast area. The later arrival may serve to squelch storm intensity though. Additional strong storms may also form as the compact short wave trough moves over the northwest part of the forecast area during the evening. These elevated storms are supported by the NAM soundings for that time period, which gives confidence to the soundings being representative. The storms should track north of the forecast area during the overnight hours. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... Issued at 208 PM MDT Mon Aug 12 2024 The long-term will start off with a high pressure system in the ARK-LA-TX area extending a ridge through the mid-Mississippi River Valley. In the Pacific Northwest, a trough will be cutting into the CONUS, with a loose axis extending down into western New Mexico. As the week progresses, another high near Baja California will slowly move over the Southern CONUS. These three features will allow for a moderately active pattern to persist through the period by forcing the 250mb jet to be southwesterly then northwesterly, and keeping the jet core near the CWA until about Sunday. Wednesday evening, we look to have the 700mb trough axis move through the area. This will give us enough forcing to have a low-end chance at severe thunderstorms. Wind and hail would be the biggest threat as these storms will be elevated from the low-level southwesterly flow throughout the day. Storms look to begin in the mid afternoon and last until around midnight. Temperatures look to warm into the mid 80s to low 90s ahead of the storms and cool into the mid 50s to low 60s that night. Thursday, guidance is showing the ridge will slowly start working in from the southwest. Northerly winds will keep us in the low to mid 80s. PoPs are low Thursday, but a few showers could occur in the evening and overnight hours. Lows look to mimic Wednesday night`s low temperatures. Friday through Monday look similar to each other as the ridge builds in even more. There is about a 20% chance of precipitation in the afternoon and evening hours each day and temperatures will range from the mid 80s to mid 90s. Low temperatures Friday night and onward look to be in the upper 50s to low 60s. && .AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/... Issued at 1010 PM MDT Mon Aug 12 2024 KGLD...VFR conditions are anticipated through about 09z with light rain and winds from the east-southeast up to 10kts. From 10z-18z, sub VFR cigs are expected due to stratus. There may be visibility reductions as well. Winds will be from the southeast up to 10kts. After 19z, VFR conditions are expected with winds slowly backing to the east at speeds up to 11kts. There could be a return of stratus clouds and sub VFR conditions a few hours after sunset. There will be a chance for showers/thunderstorms to impact the terminal after about 02z. KMCK...VFR conditions are anticipated through about 08z with winds from the east-southeast under 10kts. From 09z-19z, sub VFR conditions are expected due to stratus and fog/br. Showers may also impact the terminal. Winds generally from the east under 10kts. After 20z, VFR conditions are forecast with winds from the east to southeast at speeds up to 11kts. Showers/thunderstorms may impact the terminal after about 04z. Similar to KGLD, sub VFR conditions are possible a few hours after sunset, lasting through the rest of the taf period. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...None. CO...Flood Watch until 3 AM MDT Tuesday for COZ090>092. NE...None. && $$ SHORT TERM...JTL LONG TERM...CA AVIATION...99