


Area Forecast Discussion
Issued by NWS Bismarck, ND
Issued by NWS Bismarck, ND
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812 FXUS63 KBIS 100536 AFDBIS Area Forecast Discussion National Weather Service Bismarck ND 1236 AM CDT Thu Jul 10 2025 .KEY MESSAGES... - Isolated to scattered severe thunderstorms are possible Thursday afternoon into the night. - Temperatures will cool down to the 70s on Friday, before warming back up again for the weekend. && .UPDATE... Issued at 1236 AM CDT Thu Jul 10 2025 The remainder of the Severe Thunderstorm Watch has been cancelled early, with convection weakening and moving east of the forecast area. There are some showers moving in from eastern Montana that have a history of very strong wind gusts, so will be keeping an eye on those, although anything strong would be erratic and low predictability. UPDATE Issued at 958 PM CDT Wed Jul 9 2025 The first Severe Thunderstorm Watch has been allowed to expire, with storms out of these counties and high confidence in no additional development. A Severe Thunderstorm Watch continues from Pierce to McIntosh Counties and east, in effect until 1 AM CDT. A line of storms is ongoing from Stutsman through Dickey Counties, with an additional area of storms in northeast Wells County into Benson and Eddy Counties. SPC mesoanalysis page is advertising storms moving into an environment with weaker bulk shear, although adequate 0-3km shear could promote some isolated strong to severe wind gusts over the next hour or so. Storm motion is starting to slow down so we are monitoring for any flash flooding potential. Additional area of showers and thunderstorms is ongoing in eastern Montana but not expecting much from this activity beyond some rain and rumbles of thunder, with pretty limited instability. Freshened up POPs with this update in line with radar trends and latest blended guidance. UPDATE Issued at 757 PM CDT Wed Jul 9 2025 Increasing clouds and cooling temperatures have improved heat index values. Thus the Heat Advisory has been cancelled. Severe Thunderstorm Watch remains in effect for south central and southwestern North Dakota until 10 PM CDT. A new Severe Thunderstorm Watch is now in effect for portions of eastern North Dakota until 1 AM CDT. Hazards for both are hail to golf ball size, winds to 70 mph, with an isolated tornado also possible. UPDATE Issued at 648 PM CDT Wed Jul 9 2025 Severe Thunderstorm Watch continues across south central North Dakota. Weak dry boundary continues to progress eastward meeting high amount of instability, yet low to moderate amounts of shear. The result so far has been some large hail with limited wind gusts. As this boundary moves eastward through the evening, severe weather will remain possible. Limited change in hazards is expected. Discrete cells will bring a large hail threat, while collapsing thunderstorms or line of storms brings a strong wind threat. A tornado is possible, although limited low level shear and higher LCLs could limit this threat. For now will continue watch as is and continue to monitor for severe weather. In addition...Heat Advisory remains in south central ND until 9 PM CDT. sites are starting to cool with cloud cover and the loss of daytime heating. Given high dewpoints and elevated heat index values in these area will let advisory continue. && .DISCUSSION... Issued at 400 PM CDT Wed Jul 9 2025 Hot and humid conditions with chances for severe thunderstorms are expected through this evening. Southerly flow along a warm front has brought dewpoints into the 70s for much of central and southern North Dakota. The hottest areas in this moist southerly flow could see heat index values above 100 degrees through much of the evening. A Heat Advisory remains and was expanded slightly eastward through much of this evening. Meanwhile, a pseudo dry line is currently progressing across western and portions of central North Dakota. As this boundary meets the moist unstable air mass, isolated to scattered severe thunderstorms will be possible tonight. MUCAPE is very high and up to 6000 J/KG, with surface based CAPE about the same and becomes uncapped late this afternoon and early this evening. There is a lack of shear forecast, with effective bulk shear 25 to 30 knots through the evening. The shear vector is angled to near perpendicular to the mentioned boundary. Thus discrete cells are possible initially along this boundary this afternoon and early evening, likely forming into a line as storms progress through the evening. Initial threats will be large and abundant hail with the high amounts of CAPE expected. The lack of shear may limit the size of hail to around golf ball size. As storms collapse if a linear mode takes over, strong wind gusts in excess of 70 mph are possible given DCAPE values over 1000 J/KG. East of Highway 83 would be the area to monitor for a tornado or two this evening given high amount of SRH and 0 to 1 km wind shear. Uncertainty on storm mode, if it is still discrete by the time storms move into this area later this evening, could be the limiting factor for tornadoes today. Something to monitor throughout the evening. Slow moving thunderstorms and high pwat values today could also lead to some locally heavy rainfall through this evening. Initial thunderstorms push eastward tonight, although a few isolated thunderstorms are possible in the west and central through tonight, with a low chance of severe weather in this additional development. Lows tonight look to be in the 60s. True cold front looks to push through on Thursday. This could bring an isolated threat for severe weather to much of the state. Instability and shear look to be lower for Thursday, and SPC now has a Marginal Risk across much of the state for severe weather. Slower moving thunderstorms and high PWAT values could bring another locally heavy rain threat on Thursday, with a marginal risk for excessive rainfall across the east. Temperatures will again be warm for Thursday, with slightly cooler temperatures in the northwest. Lower dewpoints should lower the heat risk for most areas, although could be something to monitor in the east. Front fully moves through Thursday evening through the night. Chances for showers and thunderstorms could be found as this moves through, with perhaps an isolated strong to severe thunderstorm. Lows behind the front will be in 50s west to 60s east. A post frontal day then looks to be found on Friday with highs in the 70s and a few lingering showers and thunderstorms, with low chances for severe weather. Some breezy northwest winds could also be found. Lows Friday night look to be quite cool with lows in the 50s to perhaps upper 40s in some areas. Shower and thunderstorm chances also diminish Friday night. Weak ridging then looks in store for the weekend. Temperatures look to warm each day with 80s to lower 90s forecast. Chances for precipitation also look limited through the weekend. Precipitation chances return to start the work week. NSSL machine learning guidance has some low probabilities for severe weather Monday and Tuesday. Warm temperatures in the 80s and 90s could continue for Monday, then perhaps cool into the 70s on Tuesday behind the front. Perhaps some breezy winds are found behind this cold front, although the signal for strong winds is currently not found. && .AVIATION /06Z TAFS THROUGH 06Z FRIDAY/... Issued at 1236 AM CDT Thu Jul 10 2025 Generally VFR conditions through the TAF period. Thunderstorms have moved off to the east, with some showers possible at KXWA and KDIK overnight. Winds will be shifting from southerly to westerly as a front moves through the forecast area, although winds could be gusty and erratic around any showers. Thunderstorms are possible late in the TAF period, although low confidence in timing and location so did not include at any terminal with this update. && .BIS WATCHES/WARNINGS/ADVISORIES... None. && $$ UPDATE...Jones DISCUSSION...Anglin AVIATION...Jones