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Area Forecast Discussion
Issued by NWS Quad Cities, IA IL
Issued by NWS Quad Cities, IA IL
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469 FXUS63 KDVN 050545 AFDDVN Area Forecast Discussion National Weather Service Quad Cities IA IL 1245 AM CDT Fri Jul 5 2024 ...Updated for 06z Aviation... .KEY MESSAGES... - Wrap around rain showers are possible through the day on Friday. - Several rounds of showers and storms are possible in or near the area Saturday night through Monday. - Moderate to Major River Flooding continues, with further changes to river forecasts expected as we transition from predicted rainfall to observed rainfall over the next 36 hrs. && .SHORT TERM /THROUGH SATURDAY/... Issued at 255 PM CDT Thu Jul 4 2024 At 1 PM, scattered showers are moving eastward across far eastern Iowa into northwest Illinois. These showers are producing light rainfall at times. Temperatures range from 75 degrees at KAWG and KCID to 80 degrees at KMQB. Dewpoints across the area are in the upper 60s to lower 70s. Scattered showers are forecast to exit to the east by mid afternoon as shortwave exits into eastern Illinois with some clear skies behind the showers resulting in a few hours of warming across the area. Convective Allowing Models (CAMs) show CAPE increasing to 500 to 1500 J/KG into this evening ahead of a shortwave that will move across the area after 00 UTC. Models show sufficient shear across the area for severe thunderstorms with 45 to 55 knots across the area this evening. The marginal risk (level 1 out of 5) has been shrunk to along and north of Interstate 80 today. There is a slight risk (level 2 out of 5) for Buchanan County. CAMS show storms developing in north central Iowa by late afternoon ahead of a cold front and moving southeastward across our eastern Iowa counties after 7 PM and then exiting our northwest Illinois counties after 1 AM. There is still some uncertainty in the southward extent of showers and storms tonight so for now the best chances are along and north of Interstate 80. Think that the main threats are hail and damaging wind gusts. Models show the cold front exiting the area prior to 12 UTC on Friday. Low temperatures tonight are in the mid 60s across the area. The 500 mb trough and closed low are forecast to slowly move eastward through the day on Friday from northeast Iowa into Lake Michigan by 00 UTC Saturday. This will result in 20 percent chance of wrap around rain showers through the day on Friday as cooler air aloft and lift allow showers to grow quickly. High temperatures on Friday are forecast to be in the mid to upper 70s. Gusty west winds are forecast to develop Friday morning with speeds of 10 to 15 MPH and gusts up to 25 MPH. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... Issued at 255 PM CDT Thu Jul 4 2024 Dry conditions are expected late Friday night through Saturday, as the upper low moves east of the area and high pressure builds in behind it. Saturday night through Monday, the high will then exit east with a trough setting up in the plains. Several waves will move across the region during this period. The first wave with better precip chances clips our NW half of the CWA Saturday night into Sunday. The second comes over Sunday night into Monday and then a third with the cold frontal passage later on Monday. There are some timing and placement differences, but the higher POPs in the general time frames mentioned above seem to be on track. Temperatures will average slightly below normal with highs in the upper 70s to low 80s through Tuesday. Tuesday into Wednesday looks to be mostly dry with low end POPs returning for Wednesday afternoon. && .AVIATION /06Z TAFS THROUGH 06Z SATURDAY/... Issued at 1237 AM CDT Fri Jul 5 2024 Line of showers will pass through MLI at the start of the TAF period. Thunder is possible. After the line passes, a few hour period of light S/SW winds and clearing skies may allow for some patchy MVFR/IFR fog and stratus at the terminals aided by recent rainfall. A cold front will then pass through the terminals 08z-11z with winds shifting to W/NW around 10 kts. SCT-BKN clouds with MVFR to IFR bases may occur, especially near KCID and KDBQ. Otherwise, on Friday look for gusty NW winds 15-25 kt with MVFR to VFR ceilings in cyclonic flow/cold advection. Scattered showers and isolated storms are expected by peak heating, which has been handled with PROB30 mention at all sites. Winds and shower activity will look to diminish with sunset with SCT-BKN VFR clouds lingering. && .HYDROLOGY... Issued at 255 PM CDT Thu Jul 4 2024 The forecast crests along the Mississippi River have been delayed and are now showing a longer duration crest at several locations due to some rainfall and forecast rainfall upstream. Most of the crest values have been steady or only minor changes. Major flooding will be seen across much of the Mississippi River with long duration crests occurring after July 7th. Keokuk is expected to get to the Major Flood stage near the 7th or 8th, and Gregory Landing is expected to crest in its Moderate flood category. Tributary Rivers: Over the next 7 days, Moderate flooding will continue on the Wapsi at Dewitt and minor flooding will continue at Conesville on the Cedar River. Wapello on the Iowa River is expected to drop out of flood late Sunday. At Oakville, backwater from the Mississippi will keep the level high, in minor flooding, through July 11. Current projections for additional rainfall through July 10th appear to be spotty with widespread heavy rain not anticipated at this time. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...None. IL...None. MO...None. && $$ UPDATE...Haase SHORT TERM...Cousins LONG TERM...14 AVIATION...McClure HYDROLOGY...14