FXUS63 KGRB 190926 AFDGRB Area Forecast Discussion National Weather Service Green Bay WI 426 AM CDT Thu Mar 19 2026 New Information added to update section .UPDATE... Issued at 426 AM CDT Thu Mar 19 2026 The wintry mix has ended across the region early this morning. In its wake, low level moisture over the cold snowpack has led to some patchy fog across portions of central and north-central Wisconsin early this morning. The fog may be locally dense at times and may impact the morning commute. The fog is expected to lift a few hours after sunrise. && .KEY MESSAGES... - Patchy fog, locally dense at times, will affect portions of central and north-central Wisconsin this morning. - Temperatures continue rising above normal, with the warmth peaking Saturday. Snowmelt and increased flows and rising levels on rivers and streams are expected. Several rivers may reach bankfull or even minor flood stage. && .DISCUSSION... Issued at 131 AM CDT Thu Mar 19 2026 The wintry mix associated with a clipper system will end across the region early this morning. There could be some minor impacts with the morning commute, especially on untreated roadways. Otherwise, dry weather is expected once this system tracks east for the rest of the morning and into the afternoon. Temperatures continue their climb today, as highs reach into the 40s away from the lakeshore. Another clipper system will affect the area tonight, mainly bringing light rain to the northern and eastern CWA as temperatures stay in the 30s. The warming trend continues across the region on Friday as highs reach the 40s across the Fox Valley and lakeshore, with around 50 across central and north-central Wisconsin. The warming will bring an increased risk for fog with the warm air advecting over the substantial snowpack, especially during the overnight hours. A low pressure system developing over the Plains will bring a surge of warm air to the region on Saturday along with some small chances for rain across far north-central Wisconsin. This will likely be the warmest day in the upcoming week as temperatures soar into the 50s across central Wisconsin with a 20-40% chance of hitting 60 degrees south of Highway 10. The cold side of this low pressure system will track through the area Saturday night, bringing colder temperatures and a rain/snow mix as a cold front sinks south through Sunday. There is still quite a bit of uncertainty with respect to impacts with this system as some models are more robust with QPF amounts, which is evident with the large spread between the 50th and 90th percentiles for snowfall amounts. High pressure will then provide dry weather to the area early next week. Despite the passage of the aforementioned cold front, highs will still remain in the 30s and 40s through early next week. These "cooler" temperatures appear to be short lived as warmer temperatures in the 40s and 50s are expected to return by the middle of next week, which will continue the snowmelt along with the threat for fog. Additional clipper systems are expected to impact the region during the middle part of next week, bringing the chance for precipitation at times. Although the first one of these systems appears to have minimal impact with light precipitation, the second one could be more interesting depending on how much moisture can advect northward. && .AVIATION...for 06Z TAF Issuance Issued at 1043 PM CDT Wed Mar 18 2026 Scattered precipitation was occurring during the late evening, with freezing rain, sleet or snow mainly north of Highway 29 with mainly rain to the south. The precipitation should come to an end by 12z with areas of fog develop towards sunrise. Only medium confidence in CIGS later tonight as there are differences in the guidance. If the low CIGS develop, they will be slow to gradually rise should make it into the VFR category during the afternoon. The next clipper system should pass to the north of the area Thursday night, but could bring some light precip to far northern WI. && .HYDROLOGY... Issued at 131 AM CDT Thu Mar 19 2026 As temperatures warm later this week into the weekend, the snowmelt will result in increasing fast flows and rising river levels. Some rivers could reach bankfull or even minor flood stage. The lack of a rapid, significant warmup points to a more gradual rise in area rivers as opposed to widespread rapid rise flooding. That being said, the flooding situation will be monitored closely given how much water is locked up in the current snowpack across the region. && .GRB WATCHES/WARNINGS/ADVISORIES... None. && $$ UPDATE.........Kurimski DISCUSSION.....Kurimski AVIATION.......Eckberg HYDROLOGY......Kurimski