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.


Wednesday, April 12, 2023

SPC Apr 12, 2023 0600 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1200Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1239 AM CDT Wed Apr 12 2023 Valid 121200Z - 131200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE FLORIDA PANHANDLE WESTWARD INTO COASTAL ALABAMA AND MISSISSIPPI... ...SUMMARY... Isolated thunderstorms are possible over portions of the central High Plains, the southern and central Rockies, and the central Gulf Coast/Florida Wednesday into the overnight hours. A few storms along the northeastern Gulf Coast may produce isolated damaging winds and a tornado or two overnight. ...Synopsis... A low-latitude upper low will move very little today as it meanders about the LA Coast, with the parent trough providing cool temperatures aloft from TX to the FL Panhandle. A high-level speed max will begin the day over the western Gulf of Mexico, and is expected to curl northeastward around the low, nosing into the northeastern Gulf Coast late. At the surface, high pressure will extend from the Carolinas into the Southern Plains, with strong surface easterlies across much of FL and the northeastern Gulf of Mexico during the afternoon. A warm front will gradually shift northward across FL, meeting a weak area of low pressure over the water and nearing southeast LA by 12Z Thursday. Beginning during the evening and continuing overnight, dewpoints will rise over these coastal counties, resulting in increasing instability and supporting at least a minimal severe risk. Elsewhere, an upper trough over the west will favor isolated afternoon thunderstorms from parts of the Great Basin into the northern High Plains, and from NM into western CO, with weak instability precluding a severe risk. ...Coastal FL Panhandle/AL/MS Overnight... Scattered to perhaps areas of numerous storms are likely to be ongoing over the northern and eastern Gulf of Mexico as the warm front lifts slowly north. Potential for severe is forecast to increase during the late evening and into the overnight period as 60s F dewpoints move onshore, increasing effective SRH along the warm front. Although MLCAPE may only average near 750 J/kg after 06Z, hodographs will enlarge with 200+ J/kg effective SRH forecast toward 12Z. As such, some storms along the warm front may acquire rotation, with a risk of a brief tornado or two. ..Jewell/Wendt.. 04/12/2023 Read more CHECK UPDATE ZOOM GRAPHIC
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)