


Area Forecast Discussion
Issued by NWS Rapid City, SD
Issued by NWS Rapid City, SD
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
872 FXUS63 KUNR 112015 AFDUNR Area Forecast Discussion For Western SD and Northeastern WY National Weather Service Rapid City SD 215 PM MDT Fri Jul 11 2025 .KEY MESSAGES... -Dry this weekend with temperatures climbing back into the 90s -Daily chances of afternoon thunderstorms return to the forecast next week -Chance of strong to severe thunderstorms possible Tuesday && .DISCUSSION...(This Evening Through Next Friday) Issued at 115 PM MDT Fri Jul 11 2025 Current analysis shows a broad upper trough continuing to influence much of the region, maintaining cooler than normal average temperatures and scattered to widespread showers with embedded thunderstorms across much of western South Dakota and northeastern Wyoming. A pattern shift is expected heading into the weekend as a strong upper ridge builds over the central CONUS, allowing for a period of hot and dry conditions. This ridge will begin to break down early next week, allowing daily thunderstorm chances to return, with a risk of more organized storms by Tuesday. Cloud cover and lingering showers are progged to continue through today as the upper trough slowly exits the region. Highs will remain below seasonal norms, generally in the 60s and low 70s across the plains, with cooler readings in the Black Hills. Patchy drizzle and light rain will taper off by the evening as subsidence increases behind the departing wave. The gusty northwest winds will also decrease heading into the evening hours. By Saturday, a pronounced upper-level ridge begins to build across the central and northern Plains. This will result in a sharp warming trend, with highs climbing into the upper 80s to mid 90s across much of the forecast area. Sunday will be the hottest day of the period, with widespread highs in the mid to upper 90s and some triple-digit readings possible across the southern plains. The ridge will begin to flatten late Sunday into Monday as shortwave energy approaches from the Pacific Northwest. Starting Monday, daily chances for afternoon and evening thunderstorms will return, particularly across the Black hills and adjacent plains. Moisture advection and increasing instability will support convective development, though coverage may remain isolated early in the week. Tuesday will see the strongest shortwave trough passage as it exits the northern Rockies and enters the northern Plains. This system will bring enhanced shear and with a modest moist influx at the surface instability increase to around 1500 J/kg Tuesday afternoon. Organized strong to potentially severe thunderstorms maybe possible across western South Dakota. Confidence in timing and placement will improve by the end of the weekend. && .AVIATION...(For the 18Z TAFS Through 18Z Saturday) Issued At 1142 AM MDT Fri Jul 11 2025 Generally VFR conditions are expected. The exception would be MVFR conditions in scattered showers/storms, which will be possible through the afternoon. Gusty winds are expected to diminish late afternoon into the evening. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...None. WY...None. && $$ DISCUSSION/KEY MESSAGES...Woodward AVIATION...Dye