On Sunday, the warm front will move to our north. Skies will be variably cloudy, and it will be very warm and humid. High temperatures will reach the upper 80s, with heat index values into the lower to middle 90s. Most of the day will be dry, but later in the day, showers and thunderstorms will develop to the west and move into the area in the evening through Sunday night. Some of these storms may be severe. Lows will stay near 70 Sunday night.
The warm front will become stationary across northern Wisconsin, and will linger there for Monday. Showers and thunderstorms will end early in the day, but may redevelop in the afternoon or evening. Skies will be variably cloudy, and it will remain very warm and humid with high temperatures reaching the mid to upper 80s and heat index values into the 90s again. On Tuesday, a weak cold front will move through Wisconsin. Expect variably cloudy skies, warm and humid conditions, and a chacne of isolated showers and thunderstorms again. High temperatures will be in the middle 80s and heat index values in the upper 80s to lower 90s.
Wednesday will be partly sunny, warm, and humid with high temperatures in the middle 80s. On Thursday, another low pressure system will develop to our west leading to variably cloudy skies and another slight chance of isolated showers and thunderstorms. High temperatures will remain in the middle 80s. Friday will be partly sunny, very warm and humid with another slight chance of isolated showers and thunderstorms. High temperatures will be in the upper 80s, with heat index readings in the low to mid 90s.
Very warm and humid weather will continue into next weekend. Saturday will be partly sunny, very warm, and humid with a slight chance for showers and thunderstorms; high temperatures will be near 90; heat index values will be in the middle to upper 90s. A cold front will move through Wisconsin on Saturday night or Sunday. Skies on Sunday will be mostly cloudy, and it will be warm and humid with scattered showers and thunderstorms; high temperatures will be in the middle 80s.
SUNDAY:
Variably cloudy, very warm and humid with scattered showers and thunderstorms developing late in the day or overnight.
High: 87; Heat Index: 89 to 94
Wind: SE 8-15 MPH
SUNDAY NIGHT:
Mostly cloudy, warm and humid with scattered showers and thunderstorms, some may be severe.
Low: 70
Wind: SE 6-12 MPH
MONDAY:
Mostly cloudy, warm and humid with showers and thunderstorms ending in the morning, then possibly redeveloping in the afternoon.
High: 87; Heat Index: 89 to 94
Wind: S 6-12 MPH
TUESDAY:
Variably cloudy, warm and humid with a chance of isolated showers and thunderstorms.
Low: 70
High: 86; Heat Index: 88 to 92
WEDNESDAY:
Partly sunny, warm and humid.
Low: 66
High: 84
THURSDAY:
Variably cloudy, warm and humid with a slight chance of isolated showers and thunderstorms.
Low: 66
High: 86; Heat Index: 88 to 92
FRIDAY:
Partly sunny, very warm and humid with a slight chance of isolated showers and thunderstorms.
Low: 68
High: 88; Heat Index: 91 to 96
SATURDAY:
Partly sunny, hot and humid with a slight chance of isolated showers and thunderstorms.
Low: 71
High: 90; Heat Index: 93 to 98
SUNDAY:
Mostly cloudy, warm and humid with scattered showers and thunderstorms.
Low: 71
High: 86
NOTES:
There is an ENHANCED RISK for a few severe thunderstorms, along with isolated intense severe thunderstorms on Sunday and Sunday night for southeastern Minnesota, extreme northeastern Iowa, and western Wisconsin (west of a Twin Cities to Marshfield to Tomah to Prairie du Chien line). There is a SLIGHT RISK for a few severe thunderstorms over the rest of Minnesota, the rest of eastern of Iowa, much of Illinois (except for the extreme southwestern part), and the rest of the southern Wisconsin. A little more wind shear will mean a slightly higher threat for severe thunderstorms near the warm front on Sunday afternoon. In addition, a cluster of severe thunderstorms may develop in Minnesota and move toward southern Wisconsin Sunday night. High winds, hail, and heavy rainfall are the main threats. In addition, there may be the threat for widespread damaging winds if an intense cluster of severe thunderstorms develops in central Minnesota late Sunday afternoon or early Sunday night. This cluster of thunderstorms may move southeastward into northeastern Iowa and western Wisconsin before weakening Monday morning.
There is an ENHANCED RISK for a few severe thunderstorms along with isolated intense severe thunderstorms for Monday and Monday night for eastern Iowa and much of Illinois (except for the extreme northeastern and southwestern part). There is a SLIGHT RISK for a few severe thunderstorms over the rest of the eastern third of Iowa, the rest of Illinois, and the southern quarter of Wisconsin (south of a La Crosse to Wisconsin Dells to Milwaukee line). There is a MARGINAL RISK for isolated severe thunderstorms for extreme southeastern Minnesota, the rest of the eastern two-thirds of Iowa, and the rest of the southern third of Wisconsin (south of a Rochester, MN to Black River Falls to Sheboygan line). Severe thunderstorms may be present in extreme southeastern Minnesota, eastern Iowa, southern Wisconsin, and northern Illinois early on Monday morning, with high winds, hail, and heavy rainfall as the main threats. As these storms weaken, they may leave an outflow boundary over the area. As clouds thin and very warm and humid conditions develop, additional severe thunderstorms may develop along this boundary during the afternoon, heading southeastward into eastern Iowa and northern Illinois by evening. High winds, hail, and heavy rainfall are the main threats. In addition, a few tornadoes may develop where afternoon severe thunderstorm development takes place, with an isolated strong tornado possible. Also, an intense cluster of severe thunderstorms may then form, resulting in widespread damaging winds as the storms move southeastward through eastern Iowa and northern Illinois. The ultimate severe weather threat areas for Monday may have to be shifted somewhat north or south, depending on Sunday's thunderstorm activity and the position of outflow boundaries on Monday.
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