


Area Forecast Discussion
Issued by NWS Quad Cities, IA IL
Issued by NWS Quad Cities, IA IL
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656 FXUS63 KDVN 030528 AFDDVN Area Forecast Discussion National Weather Service Quad Cities IA IL 1228 AM CDT Thu Jul 3 2025 .KEY MESSAGES... - A low chance of thunderstorms during the afternoon and evening on Thursday. A storm or two could become strong to severe, with winds as the main hazard. - The Fourth of July is forecast to be hot and humid with temperatures in the low to mid 90s and heat indices near 100. && .SHORT TERM /THROUGH FRIDAY/... Issued at 201 PM CDT Wed Jul 2 2025 Surface high pressure is currently centered over the Ohio River delta this afternoon, helping to keep this afternoon warm and dry. That being said, a remnant mesoscale convective system will approach areas south of I-80. This could throw a wrench in the forecast with at least a small threat of a thunderstorm or two. While unlikely to occur, confidence is not high enough to rule this out. Temperatures climb a few degrees into the upper 80s this afternoon. Overnight a weak disturbance passes through the region, setting up a weak surface boundary. Southwest flow over this weak boundary ahead of this disturbance is expected to result in a low (10-30%) chance of thunderstorms across the I-380 corridor overnight. With modest mid- level lapse rates and wind shear, at least a Marginal Risk (Level 1 of 5) of severe weather is possible. Hail and winds are the main hazards should severe weather develop. Any thunderstorms weaken and dissipate around sunrise. Temperatures continue their warming trend, reaching the low 90s by the afternoon. Another weak disturbance passes through the region during the afternoon and evening. An additional low (10-30%) chance of thunderstorms is forecast for areas north of I-80 as a result. At least a Marginal Risk (Level 1 of 5) of severe thunderstorms continues, though mainly for hazardous winds. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... Issued at 201 PM CDT Wed Jul 2 2025 A relatively warm and muggy start to the day on Friday signals a warm holiday afternoon and evening. The Fourth of July will be hot as low 90s and relatively humid conditions are anticipated across the area. This combination of temperatures and relative humidity push heat indices to near 100. In this heat, practice heat safety and take precautions, especially with outdoor activities during the holiday. Friday evening remains dry as a passing ridge offers a lull in the thunderstorm chances. This lull is brief as a more active weather pattern takes shape across the Upper Midwest. A series of disturbances are forecast to pass through the area heading through this weekend and into the following week. The first and strongest of these disturbances arrives Saturday afternoon. This coincides with peak heating. Temperatures reach the upper 80s and low 90s with humid dewpoints in the low 70s. A medium (40-70%) chance as thunderstorms takes shape as this features moves east heading into Sunday. Given the summer-time instability, a severe threat may develop, but it is currently too soon to discuss these details. As this first disturbance begins to exit the area later in the day on Sunday, slightly cooler temperatures in the upper 80s return. Heading into the first half of next week, afternoon temperatures remain in the mid to upper 80s each day. Continued passing disturbances maintain at least a low (20-40%) chance of thunderstorms for the region. The timing of thunderstorms is anticipated to be focused on the afternoon and evening hours each day. Their remains an off chance that a decaying convective system from the Great Plains makes it into our region during the nighttime hours, but this remains highly uncertain. With continued thunderstorms through much of the forecast, beneficial rainfall should improve rainfall deficits across portions of the area. && .AVIATION /06Z TAFS THROUGH 06Z FRIDAY/... Issued at 1225 AM CDT Thu Jul 3 2025 VFR conditions will prevail through the TAF period, with light and variable winds to start, becoming south-southwesterly around 5-10 KTs after 15z. There will be low-end chances (<25%) for an isolated shower/storm, mainly at DBQ or CID early in this period, then once again after 18z. Although, confidence remains low and opted to leave out of the TAFs at the moment. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...None. IL...None. MO...None. && $$ SHORT TERM...NWS LONG TERM...NWS AVIATION...Gunkel