Area Forecast Discussion
Issued by NWS Quad Cities, IA IL
Issued by NWS Quad Cities, IA IL
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301 FXUS63 KDVN 162335 AFDDVN Area Forecast Discussion National Weather Service Quad Cities IA IL 635 PM CDT Sun Jun 16 2024 .KEY MESSAGES... - A thunderstorm complex will continue to translate through the southern portions of the area this afternoon, which will support the continued threat for isolated strong to severe storms - Hot and humid conditions will continue through Tuesday before some relative relief arrives for Wednesday - Periodic chances of showers and storms remain with us for Wednesday through the end of the week && .SHORT TERM /THROUGH MONDAY/... Issued at 221 PM CDT Sun Jun 16 2024 We continue to keep an eye on a complex of showers and thunderstorms that have developed over our southern forecast area early this afternoon, caused by an MCV that developed over eastern Kansas early this morning. Given the hot and humid conditions, characterized by observed temperatures in the upper 80s to near 90 and dew points in the upper 60s to lower 70s, SBCAPE values per the RAP are progged around 2500 to 3500 J/kg, which is quite substantial. The latest CAM guidance has the MCV convection remaining along and south of I-80, but with a northeastward track, points north of I-80 in northwest Illinois and far east- central Iowa will be under the gun for strong to severe convection over the next few hours. The main threat continues to be locally strong wind gusts to around 60 mph, with large hail and an isolated tornado being a secondary threat. SPC continues to have most of the area in a Marginal Risk (level 1 of 5) for severe weather, with much of northwest Illinois in a Slight Risk (level 2 of 5). This afternoon, heat indices have increased to the middle to upper 90s, so the heat and humidity have arrived. Expect this to continue Monday, and even into Tuesday (more on Tuesday in the long-term forecast discussion). Monday still looks to be the hottest day of this stretch of heat, with high temperatures in the middle to upper 90s, and heat indices in the middle/upper 90s, near 100 for some isolated areas. We will have to watch closely for the potential for Heat Advisory headlines as the latest guidance indicates a period of at least 6 hours or more of 100+ degree heat indices, mainly for our west-central Illinois/far southeastern Iowa counties. Although the guidance has come into better consensus on these values, there is still at least some noticeable spread among the CAMs for dew point temperatures, with a spread of around 2 to 5 degrees F between the 25th and 75th percentiles on the 16.12z HREF, so confidence is a bit lower on how high the heat indices will reach. Regardless, it will be a hot day all-around, so anyone that will be outdoors for a period of time should take extra precautions to protect themselves from the heat! && .LONG TERM /MONDAY NIGHT THROUGH SUNDAY/... Issued at 221 PM CDT Sun Jun 16 2024 Monday night through Tuesday night will remain quite warm for this time of the year, with yet another day of high temperatures into the lower to middle 90s and heat indices into the middle to upper 90s for Tuesday. Overall, Tuesday`s heat appears to be similar to what we are experiencing today, so heat headlines aren`t expected at this time for Tuesday. As we`ve been mentioning, new record highs aren`t expected with this stretch of heat, but we are more confident for record warm low temperatures to be broken, especially for tonight, Monday night, and Tuesday night. See the Climate section below for the list of records that could be tied or broken. A pattern change is expected to occur by Wednesday, as the upper- level ridging over the eastern US breaks down, and a longwave trough develops over the Intermountain West region. As the trough approaches, an attendant cold front will sweep through the area, which will bring widespread chances (30 to 60%) of showers and storms. This should bring at least some relative relief to the heat and humidity, although high temperatures in the upper 80s to lower 90s south of the Highway 20 corridor will remain possible for Wednesday through Friday. A few additional mid- level shortwaves are expected to overtop the ridge into our area, so additional chances of precipitation will be in place through the end of the week. Chances for strong to severe storms remains low, which is evident in the CSU severe weather probabilities indicating either very low probabilities or none at all for this period. && .AVIATION /00Z TAFS THROUGH 00Z TUESDAY/... Issued at 636 PM CDT Sun Jun 16 2024 VFR conditions are expected through the period. Winds will become less strong overnight and then increase again tomorrow AM. There is 15% chance for thunderstorms tomorrow, however due to low coverage and confidence where they may form, have opted to leave out of TAFs at this time. && .CLIMATE... Issued at 300 AM CDT Sun Jun 16 2024 Record High Temperatures: June 17: KBRL: 98/1944 KMLI: 98/1897 Record Warm Minimum Temperatures: June 16: KMLI: 77/1918 June 17: KDBQ: 74/1921 KMLI: 78/2018 June 18: KDBQ: 74/1921 KMLI: 77/2018 June 19: KDBQ: 76/1931 KMLI: 78/1953 && .DVN WATCHES/WARNINGS/ADVISORIES... IA...None. IL...None. MO...None. && $$ SHORT TERM...Schultz LONG TERM...Schultz/Uttech AVIATION...Gibbs CLIMATE...Schultz/Uttech