Area Forecast Discussion
Issued by NWS Central Illinois
Issued by NWS Central Illinois
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966 FXUS63 KILX 041049 AFDILX Area Forecast Discussion...Updated Aviation National Weather Service Lincoln IL 549 AM CDT Tue Jun 4 2024 .KEY MESSAGES... - 2 rounds of storms and showers this afternoon into the overnight hours ahead of a passing cold front with another low threat for strong-to-severe storms. - A brief dry period settles in before the potential for rain arrives again for the weekend (10-20% chance). && .DISCUSSION... Issued at 250 AM CDT Tue Jun 4 2024 As a MCV passes through again today, more showers and thunderstorms could pop up. Today, the shear looks healthier (25-35kts) than yesterday. This could mean that the storms that do fire up could live slightly longer. There is a threat of severe weather this afternoon, with the main hazards being marginally severe hail and locally damaging winds, but most storms will be of the typical summer-time pop up storm genre. MCVs are known to be tricky and could increase the severe threat. There is a 40-60% chance of showers and thunderstorms this afternoon starting after 18z. Coverage will be of the scattered nature for areas along and north of I-70. SBCAPE values of 1500-2500 J/kg support the development of these storms. The PWAT values this afternoon are 1.6-1.8, which support that these showers/storms could produce locally heavy downpours. The first and second rounds appear to blend together around midnight as the cold front enters the CWA from the west. The line of showers and thunderstorms along the front will move through from 05z to 15z tomorrow. Thunderstorm activity with this round may be limited due to the convection earlier in the day, if the afternoon convection pans out like the CAMs (NAM 3km, HRRR, ARW) are depicting. The potential for a worked over environment to be in place could mean that along the front there would only be stronger showers without the presence of thunderstorms. As the line moves across central Illinois, it breaks up as it passes the I-55 corridor. Many locations east of I-57 could see no rain out of the overnight system as it become more scattered. Behind the cold front, we will see a short period of dry weather as a high pressure builds over the region. Surface high temperatures cool slightly but remain around the upper 70s. By Sunday, highs warm back up to near or just above 80 degrees. There is a very small chance for rain this weekend (saturday and Sunday), with POPs of 10- 20%, as MCSs are passing to our far south. There is the small chance that one could drift just far enough north-northeast to affect central and southeastern Illinois. Copple && .AVIATION... (For the 12z TAFs through 12z Wednesday Morning) Issued at 549 AM CDT Tue Jun 4 2024 To start out all sites will be VFR. By mid afternoon (20-22z), SH and TS will move into the area along with some gustier winds out of the south. Overnight tonight, a cold front will move through, shifting the winds to out of the west and calming down. There is a chance for showers and thunderstorms from this afternoon to tomorrow morning until the cold front exits central Illinois. The exact location and time for these showers/t`storms is uncertain, so a VCSH has been carried through the TAF period. Ceilings will drop to MVFR (PIA/SPI/BMI) or IFR (DEC/CMI) by tomorrow morning. Copple && .ILX WATCHES/WARNINGS/ADVISORIES... None. && $$