471
FXUS63 KDLH 282030
AFDDLH

Area Forecast Discussion
National Weather Service Duluth MN
330 PM CDT Fri Jun 28 2024

.KEY MESSAGES...

- Isolated thunderstorms and scattered thunderstorms return
  tonight and last into Saturday morning. Strong thunderstorms
  may affect the Brainerd Lakes area and near to south of the
  Twin Ports late tonight, but severe storms are not expected.

- The next round of moderate to locally heavy rainfall is
  expected Monday evening through Tuesday.

- Scattered thunderstorm chances last into the 4th of July
  holiday time period.

&&

.DISCUSSION...
Issued at 237 PM CDT Fri Jun 28 2024

Low pressure centered over eastern Manitoba draping southward
into North Dakota. An associated warm front moved over the
region earlier today and brought widespread moderate rainfall of
0.5 to 2 inches to the Northland, with local amounts to 3.5
inches. Elevated stream levels have been observed along the
North Shore where a Flood Advisory remains in effect until this
evening for water over a few roads as well.

An instability CAPE axis builds over northwest Minnesota today
under partly sunny skies and moves northeastwards this evening
to setup over the Brainerd Lakes area towards sunset today and
lasting into the early overnight hours. This coincident CAPE
axis and lower-end of modest mid-level lapse rates could support
a few general thunderstorms late this evening, but confidence is
not very high in this scenario playing out. If those storms do
form, small hail and wind gusts to 40 mph would be the most
likely hazards. More likely though is a secondary boundary
moving into the Upper Midwest after Midnight tonight and
producing a cluster or disorganized line of general
thunderstorms traveling west to east from near or north of
Brainerd through the Twin Ports or into east-central Minnesota
from 2-7 AM Saturday. Have kept with around a quarter inch of
rainfall in the forecast for the greater Brainerd Lakes for this
overnight weak storm complex chance (30-40% chance of
occurring). As the mean trough axis pulls east of the Upper
Midwest into the Great Lakes Saturday afternoon, the lingering
scattered rain showers and storms tomorrow decrease in coverage.

High pressure builds in Saturday night and is forecast to create
fairly ideal radiational cooling conditions by early Sunday
morning. Lowered Saturday night min temperature for cold basins
using the 20th percentile of guidance to get some upper-30s in
the forecast (38-40 on the cold side right now). There are hints
of even a few mid-30s for the interior Arrowhead, but was not
quite confident in that solution right now to place those values
in the forecast. Either way though, frost would not currently
be expected at any locations.

Dry and quiet weather sets up for Sunday and most of Monday with
a mid-level ridge overhead. As the ridge axis slides east of the
Northland Sunday night, a low-level southerly jet begins to
increase moisture over the Upper Midwest into Monday morning.

Surface low pressure begins to deepen over the southern Canadian
Prairies Monday early Monday morning, with a negatively tilted
trough axis aloft. Widespread moderate rainfall begins again in
north-central Minnesota later Monday afternoon as the surface to
mid-level frontal forcing shift eastward into the Red River
valley region and coincide with the very moist air mass.
Instability, support aloft and available shear are to be most
favored for severe weather in eastern North Dakota and northwest
Minnesota for Monday evening. With an eastward shift of 50-100
miles though in these severe weather ingredients, then there
could be a low end severe weather potential beyond strong
thunderstorms currently expected in north-central Minnesota.
Heavy rainfall of 0.5 (70% chance) to 1.5 (40% chance) inches is
currently forecast into Tuesday daytime, but an upper-end 2-3
inches cannot be ruled out (highly localized 5% chance)
somewhere in the Northland by Tuesday night.

Lingering moisture aloft and diurnal instability lead to
continued thunderstorm chances even into the mid and end of next
week. Keep this potential in mind when beginning to finalize
plans for the 4th of July. Temperatures are likely to warm back
into the mid to upper-70s though for Tuesday onward.

&&

.AVIATION /18Z TAFS THROUGH 18Z SATURDAY/...
Issued at 1228 PM CDT Fri Jun 28 2024

IFR to MVFR conditions within mist and drizzle persist this
afternoon and through tonight as a cold front passes over the
region. Overnight thunderstorms may form tonight in north-
central Minnesota and pass through BRD/HIB/DLH after 06Z
tonight. Southerly winds today shift westerly behind the cold
front and then north-northwesterly by Saturday daytime as
vicinity showers occur mainly in northeast Minnesota on the
wrap-around flow.

&&

.MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/...
Issued at 237 PM CDT Fri Jun 28 2024

Southerly winds gusting to 20 knots along the South Shore this
afternoon decrease this evening. Winds veer westerly tonight as
a cold front passes over the lake. Northwesterly winds increase
Saturday morning and are expected to gust to 20 knots along the
North Shore and into the head of the lake tomorrow. There is not
quite high enough confidence at this point for a Small Craft
Advisory Saturday, but could be needed in subsequent forecasts.
Winds back southwesterly around 10 knots Sunday as warmer
southerly flow returns.

For the open water discussion, refer to the NWS Marquette Area
Forecast Discussion at weather.gov/mqt.

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
MN...None.
WI...None.
MARINE...Small Craft Advisory until 4 PM CDT this afternoon for LSZ121-
     140-144>148-150.

&&

$$

DISCUSSION...NLy
AVIATION...NLy
MARINE...NLy