Marine Weather and Tide Forecast for Necedah, WI

DISCUSSION
Issued at 105 AM CDT Fri Jun 26 2026

Today and Tonight

An embedded shortwave trough in the zonal flow will move across northern Minnesota and northern Wisconsin today and upper Michigan tonight and another shortwave trough will move across Iowa this morning and northern Illinois and southern Great Lakes this afternoon and tonight. Surface-baased CAPES will be generally less than 200 J/kg. The best surface to 850 mb moisture convergence will be to our north and south. As a result, it is not surprising that the CAMs are mainly dry across the Upper Mississippi River Valley through tonight.

High temperatures will be in the mid- and upper 70s this afternoon and the low temperatures will be in the 50s tonight.

Saturday

A 500 mb ridge will slowly build across the area on Saturday. This will keep the area dry. High temperatures will be around 80 degrees.

Saturday night and Sunday

A warm front will produce scattered showers and storms as it moves northeast through the area on Saturday night and Sunday. With most- unstable CAPES less than 200 J/kg and weak shear 0-3 km and 0-6 km shear, not anticipating any organized severe weather. Low temperatures will range from the mid-50s to mid-60s. High temperatures on Sunday will range from the upper 70s to upper 80s.

Sunday night through Monday

As the western US trough digs, the upper level ridge will build northward toward Hudson Bay. Southerly winds will increase 850 mb temperatures into the 24 to 26C on Monday. These temperatures are 2 to 3 standard deviations above normal. This will result in high temperatures in the lower to mid-90s on Monday. With dew points in the 70s, heat indices would range from the 100 to 110. This could result in an Extreme Heat Warning.

Monday night and Thursday

The models continue to show that as a series of shortwaves eject out of the western longwave trough from Monday night through Thursday, the upper level ridge will gradually flatten. These shortwaves will be close enough that they will provide a chance for periodic showers and storms. With strong and and very strong instability across the region, some of these storms may become severe. This will be highly dependent upon the timing and the 0-3 km and 0-6 km shear.

High temperatures will range from the upper 80s to mid-90s. Heat indices will likely range from 100 to 110 on Tuesday and range from 95 to 105 Wednesday and Thursday. The confidence on the high temperatures and heat indices are lower due to the potential of showers and storm. If Wednesday remains similar to Monday and Tuesday, an Extreme Heat Warning may be needed even those the heat indices are lower. This is due to the longevity of this extreme heat.

AVIATION /12Z TAFS THROUGH 12Z SATURDAY/
Issued at 603 AM CDT Fri Jun 26 2026

While VFR conditions are carried in the current TAFs, there is potential for fog and/or stratus in river valley locations, ongoing at issuance, to recur tonight into Saturday morning. At this time, confidence was too low to introduce at LSE.
Otherwise, expect winds to consistently be out of the southeast at less than 10 knots.

CLIMATE
Issued at 105 AM CDT Fri Jun 26 2026

With 850 mb temperatures 2 to 3 standard deviations warmer than normal, there will be a potential for some warm low temperature records to be tied or broken south of Interstate 94 on Monday and maybe Tuesday.

ARX WATCHES/WARNINGS/ADVISORIES
WI...None.
MN...None.
IA...None.