Temps | Gusts | WU KORD KPWK

CLICK for this month's BIG night sky ...




Cardinal SAT


MOBILE DEVICE? Turn sideways. Weather conditions directly above are near Lakefront. Top tabs refer to O'Hare (official).

Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.


Saturday, July 24, 2021

SPC Jul 24, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1124 AM CDT Sat Jul 24 2021 Valid 241630Z - 251200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING FROM NORTHERN ILLINOIS INTO LOWER MICHIGAN... ...SUMMARY... Severe thunderstorms with wind damage, isolated large hail, and a tornado or two are expected from northern Illinois into Lower Michigan this afternoon and evening. ...Lower MI... A well-defined shortwave trough over WI/Upper Mi will track rapidly eastward today across Lower MI. A moist and unstable air mass is in place over this region, along with relatively strong vertical shear. Thunderstorms (including a supercell or two) are expected to develop by mid-afternoon and track across the region, posing a risk of damaging wind gusts and isolated tornadoes. Please refer to MCD #1339 for further details. ...IL/IN... By mid-late afternoon, strong instability is expected to develop along the trailing cold front from southwest Lower MI into northern IL/IN. Scattered thunderstorms are expected to form along this axis, although models vary significantly regarding coverage and intensity. Those storms that do form will pose a risk of damaging wind gusts through the early evening. ...AZ/NV... Similar to yesterday, scattered afternoon thunderstorms will affect much of northern AZ and southern NV. A moist boundary layer coupled with strong heating through early afternoon will help to yield MLCAPE values around 1500 J/kg. Low-level shear is weak, but 25 knot mid-level winds will help organize westward-moving cold pools and result in the potential for gusty winds in some areas, along with hail in the higher elevations. ..Hart/Lyons.. 07/24/2021 Read more LIVE:
SUNRISE AND SUNSET TIMES IN UTC (if you're not logged in to Google)
CHICAGO UTC-6 during CST (Central Standard Time, e.g., winter)
CHICAGO UTC-5 during CDT (Daylight Savings Time, e.g., summer)