textproduct: La Crosse

KEY MESSAGES

- Light to moderate snowfall and breezy winds linger through the morning hours with an additional inch or less of snow possible. Continued impacts to travel are expected into the late morning, primarily along and south of I-90.

- Below normal temperatures are expected through the new week. The coldest temperatures are expected Thursday.

- A quick hitting system moves through the Midwest Monday afternoon and evening, possibly bringing light snow to portions of northeast Iowa and southwest Wisconsin (30-60%).

DISCUSSION

Issued at 419 AM CST Sun Nov 30 2025

Lingering Snowfall and Breezy Winds This Morning

As this weekend's winter storm continues trudging eastward today, cyclonic flow and weak positive vorticity advection lingers across the region through the morning hours, supporting light to moderate snowfall which will taper off to flurries by mid morning. Breezy winds of 20-35 mph linger as well which is expected to lead to periods of blowing snow, especially west of the Mississippi River. The continuation of these weather conditions will prolong the already difficult travel conditions, primarily for areas along and south of I-90. Because of this, opted to issue a Winter Weather Advisory for these areas through the morning to highlight the continuing sub-warning level impacts. Snowfall and winds begin to diminish from west to east by the afternoon as the upper wave and associated surface frontal system moves eastward, but an additional inch or less is expected before all is said and done.

Below Normal Temperatures

Cold air advection in the wake of the weekend's winter storm will be the initial catalyst for cold temperatures throughout the week, generally 5-15 degrees below normal. High temperatures will struggle to climb out of the 20s and lows sit in the single digits to mid teens.

On Wednesday, a cold front is expected to move through the region, reinforcing the already cold temperatures in place with strong cold air advection in its wake. As such, Thursday looks to be the coldest of the bunch. The 30.01z NBM indicates temperatures Thursday morning will be 5-10 degrees below zero with highs topping out in the teens, a whopping -20 degrees below normal.

Along with the strong cold air advection Thursday, a tightened pressure gradient is expected, leading to an increased low level synoptic wind field. These increased winds will translate to very cold apparent temperatures, nearing advisory criteria (-25F) west of the Mississippi River, which the 30.00z LREF indicates 10-30% probability of falling below. Will need to continue to monitor temperature trends during this period for potential impacts.

Light Snow Potential Monday

The next chance for precipitation comes Monday afternoon and evening as tropospheric deep troughing moves through the United States, supporting a surface low pressure system that propagates quickly through the Midwest. The 30.00z LREF members are in good agreement that the bulk of this system stays to our south where a ribbon of 850hPa moisture situated under a 500hPa jet streak and strong positive vorticity advection associated with the aforementioned trough provides a more favorable environment for precipitation. However, these features do nudge up into our neck of the woods slightly which should provide some light snowfall during this period given a below freezing atmosphere. The 30.00z LREF probabilities for measurable precipitation have increased slightly as compared to the previous run, currently sitting at 30-60%, highest southeast of a line from central Iowa to central Wisconsin. Snowfall amounts will be light, with the 90th percentile of the 30.00z LREF suggesting around 1 inch.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

Issued at 534 AM CST Sun Nov 30 2025

Light snow and IFR/Low MVFR conditions continue over the next few hours, but the snow is expected to taper off to flurries by mid morning with flight conditions improving to VFR this afternoon. Northwest winds persist throughout the day, gusting 15-25kts this morning but diminish to less than 15kts by the afternoon. Winds become light and variable overnight, backing to the southwest, with MVFR conditions expected to return.

ARX WATCHES/WARNINGS/ADVISORIES

WI...Winter Storm Warning until 6 AM CST early this morning for WIZ029-032>034-041>044-053>055-061. Winter Weather Advisory until noon CST today for WIZ041>044- 053>055-061. Winter Weather Advisory until 6 AM CST early this morning for WIZ017. MN...Winter Storm Warning until 6 AM CST early this morning for MNZ079-086>088-094>096. Winter Weather Advisory until noon CST today for MNZ087-088- 094>096. IA...Winter Storm Warning until 6 AM CST early this morning for IAZ008>011-018-019-029-030. Winter Weather Advisory until noon CST today for IAZ008>011- 018-019-029-030.