That's the code for "frontal passage" on aviation meteorological reports. Apparently yesterday while I was on my way to O'Hare I missed a big one:
While temperatures began dropping across the far northern suburbs as early as mid-afternoon, the city was invaded by 30+ mph gusts late in the evening rush hour, initiating a thermal tailspin. In a single hour's time, readings at the Harrison-Dever Crib, three miles off Chicago's shoreline, dove from 62°F to 42°F—a 20°F pullback—between 6 and 7 p.m. The same period saw readings at Northerly Island on the city's lakefront plunge from 64°F to 47°F. A minute-by-minute temperature analysis off a Weather Bug sensor on the South Side at the Dumas Elementary School indicated readings there plunged 15°F in only 12 minutes—from 62°F at 6:39 p.m. to 47°F at 6:51. By late evening, North Shore readings were uniformly up to 25°F off the 60°F levels of only hours before.
Yikes. Here's the art:
Today's forecast is for sunny skies and 26°C.
Oh, sorry. That's my forecast. Back in Chicago they've got snow and freezing temperatures. Sorry.