787
FXUS63 KGRR 260528
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
128 AM EDT Fri Jun 26 2026
.KEY MESSAGES...
- Scattered afternoon/evening storms north
- Building heat
&&
.DISCUSSION...
Issued at 136 PM EDT Thu Jun 25 2026
- Scattered afternoon/evening storms north
Radar shows scattered convection as developed over the northern
cwa near US-10. We`ll continue to monitor for the potential for
isolated severe storms as there is sufficient instability,
moisture, but marginal shear values. These showers/storms will
dissipate after sunset.
- Building heat
The developing story across the Great Lakes will be the building
heat that will likely result in heat headlines next week.
A deepening upper trough over the northern Rockies will result in
a building ridge over the central US including the Great Lakes. H8
temperatures are expected to increase from 18C Monday to 24C late
Tuesday. That type of heat will send surface temperatures into
the lower to mid 90s for much of next week. Most models increase
dewpoints into the lower to mid 70s during the heat wave which
will make the air feel incredibly humid. The high heat and
humidity may result in scattered convection if the cap doesn`t
become too strong. Overall, though, we don`t anticipate much
precipitation next week due to short waves riding over the top of
the ridge well north of the cwa.
&&
.AVIATION /06Z TAFS THROUGH 06Z SATURDAY/...
Issued at 126 AM EDT Fri Jun 26 2026
The clear skies and calm winds will lead to another round of low
clouds that will settle over the region overnight. Expect MVFR
cigs and vsbys with IFR possible, especially at LAN and
potentially JXN. Best chance for reducing conditions will be from
09Z until 12Z. Expect improving conditions after sunrise with VFR
from mid morning onward.
&&
.MARINE...
Issued at 136 PM EDT Thu Jun 25 2026
A weak pressure gradient will limit marine issues as we move
toward the weekend. However, dewpoints in the 70s over cold water
may result in dense fog by the end of the weekend through much of
next week.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...04
AVIATION...Ceru
MARINE...04
NWS GRR Office Area Forecast Discussion
