After a rainy start Thursday, the warm front passed through the area around Noon, skies will clear and temperatures soared to near record levels. Rockford’s high of 92 yesterday was the 4th 90 degree temperature of September and 15th 90 of 2013. It was also just one degree shy of the record high for the date of 93 degrees set back in 1948. Thursday could very well have been the last 90 of the year and warmest weather until next warm season.
The 0.15 was the second consecutive day of measurable rainfall in Rockford. This is the first time since August 5th and 6th that we saw measurable rain on back-to-back days. We have seen 1.45 inches of rain over the last 5 days, compared to 1.64 inches of rain over the previous 30 days. Showers and thunderstorms erupted in northern Missouri and central Iowa late Thursday afternoon, where they badly need the rain as most sections of that area are considered to be in Severe Drought by the latest U.S. Drought monitor.
The extremely hot and humid air mass more typical of July than September, produced a very unstable air mass out ahead of an approaching cold front, however due to the loss of heating after sunset, the storms weakened as they approached northern Illinois. Rockford still did see a few tenths of an inch of rain, but more is needed to catch up due to the extremely dry conditions over the Upper Midwest since July.
A cold front has passed through the area as of Noon in Rockford. Temperatures near 70 will slowly start to fall as the day goes on through the 60s under mostly cloudy skies and winds switching to the west and then the northwest. After two above normal days, Friday and into early next week temperatures will remain cool and below average, with dry conditions.
Temperatures Saturday and Sunday look to struggle to reach the mid and upper 60s, which would be over 20 degrees cooler than Thursday’s 92 degree high. Overnight lows Saturday night and Sunday night could dip well into the 40s in most spots, even upper 30s in the coldest low lying areas, which would be 50 degrees colder than the 90s seen Thursday. This would be the second time in as many weeks the area has seen a pull-back in temperatures of 50 degrees over a span over only a couple days. A truly fall feel will be in the air this weekend and just in time as Astronomical Fall starts Sunday afternoon.
High pressure will start to move in over the weekend. As it does, skies will clear and winds will blow out of the Northwest on Saturday and switch to the Northeast on Sunday. Potty showers and Lake Affect clouds will be possible in southeastern Wisconsin, Northeast Illinois, and Northern Indiana as cool north winds blow over the upper 60 degree Lake Michigan waters.
Conditions will be dry through the weekend and the first half of next week as high pressure dominates our weather pattern. Mid-week a warm front will approach the area, giving us our next real chance of showers and thunderstorms. Temperatures will moderate a couple degrees each day form the low 70s Monday to the lower 80s by the end the work week, before a strong cold front will move through to start the weekend and knock temperatures down again to the 60s.
Early indications that the warmer temperatures will continue to close out September and last into early October. A wetter weather pattern is also forecast to take hold over the coming weeks as well.
Friday Afternoon: Mostly cloudy, gradual clearing, temperatures near 70, then falling through the 60s. West wind 10 to 15 mph, gusts over 20 mph.
Friday Evening: Temperatures in the low 60s. Turning partly cloudy later. West northwest wind 10 to 15 mph.
Friday Night: Clearing, temperatures in the upper 40s. West northwest wind around 10 mph.
Saturday Morning: Clear and cool. Temperatures near 49. Northwest wind 5 to 10 mph.
Saturday Afternoon: Sunny, cool, high in the middle 60s. Northwest wind 5 to 15 mph.
Saturday Night: Mostly clear, low near 40. North wind around 5 mph, becoming calm late.
Sunday Morning: Temperatures in the low 40s under clear skies, Northeast winds 5 to 10 mph.
Sunday Afternoon: Temperatures warming to the mid to upper 60s, under partly cloudy skies. Northeast wind 5 to 10 mph.
Sunday Night: Mostly clear, with a low in the low to mid 40s. East northeast wind around 5 mph.