La Porte, Minnesota Weather Forecast Discussion

593
FXUS63 KFGF 081322
AFDFGF
Area Forecast Discussion
National Weather Service Grand Forks ND
822 AM CDT Mon Sep 8 2025
.KEY MESSAGES...
- Isolated severe thunderstorms (SPC risk level 1 of 5) are
  possible late this afternoon and evening over west central
  Minnesota and far southeast North Dakota. Large hail is the
  main threat. Threat is conditional, as storms may not form.
&&
.DISCUSSION...
Issued at 334 AM CDT Mon Sep 8 2025
...Synopsis...
Satellite is showing northeast advance of an arc of mid clouds
from far southeast ND southeast toward Minneapolis at 08z. From
850 mb analysis via SPC this cloud area coincides with advance
of 850 mb moisture and temperature advection due to southwest 850
mb winds of 30 kts.
This 850 mb advancement of moisture and 850 mb warm
advection/instability will advance northeast today and be
situated from northeast MN southwest thru west central MN and
into far southeast ND/northeast SD by afternoon. 850 mb winds
southwest in this zone, so advance of 850 mb moisture and
instability looks to be held in place and mainly south of a
BJI-FAR line. Subtle 500 mb short wave upstream moving thru
southern Saskatchewan will move into eastern ND and southern
Manitoba by late today. Forcing with this wave though is rather
weak. What seems more noticeable is a development of a surface
low in west central into central South Dakota today, with a
developing frontal boundary setting up across far southeast ND
into north central and northeast MN again near and south of a
BJI-FAR line. South of this boundary dew pts forecast by all
CAMs and global models to reach the low-mid 60s mid to late this
afternoon and with high temps around sfc CAPE values over 2000
j/kg are forecast near the MN/SD/ND border region.
...Isolated severe storms possible late this aftn/eve...
Models indicate elevated convection will develop by mid aftn and
last into the evening focused more on the nose of the southwest
850 mb jet thru northeast MN into west end of Lake Superior.
Question is will there be enough upper level forcing with 500 mb
wave moving into E ND to generate a few t-storms in the more
unstable airmass over our far south and southeast fcst area late
in the day or evening. 30 kts 0-6 km bulk shear is there....so
enough for some organized updrafts should storms form. That is
the question will storms form and if they do will they grow
enough to become briefly strong/severe. SPC does place parts of
west central MN in marginal risk (level 1 of 5) for late
today/evening conditional based on if storms form.
Lingering chance of a few shower or a t-storm may last into
Tuesday depending on speed of weak boundary moving south in
central MN. But otherwise warming temps aloft with 500 mb ridge
developing north into central Canada while 500 mb trough moves
into the western US. Position of upper trough and potential 500
mb low in Oregon or northern California will keep higher chances
for any shower/t-storm activity to our west, but as weak 500 mb
waves move out from the upper trough and what looks like along
the North Dakota and Manitoba border region Thursday and beyond
some chances for shower/t-storms are present. Organized severe
convection is not anticipated at this time.
&&
.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/...
Issued at 708 AM CDT Mon Sep 8 2025
Expect VFR conditions thru the period at TAF sites. Late today
or evening risk of a t-storm or two south of BJI-FAR line and
thus at this time thinking chance at BJI or FAR airports are
very low thus no mention.
&&
.FGF WATCHES/WARNINGS/ADVISORIES...
ND...None.
MN...None.
&&
$$
DISCUSSION...Riddle
AVIATION...Riddle

NWS FGF Office Area Forecast Discussion