ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 091643
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1143 AM CDT Fri May 09 2025
Valid 091700Z - 101200Z
...NO CRITICAL AREAS...
An evolving narrow corridor of isolated showers and thunderstorms
along a cold front will progress through southern Minnesota/northern
Wisconsin through today. Expected PWAT values of 0.8 to 1.0 inch
will support a mix of wet and dry thunderstorm cores through the
afternoon so Isolated Dry Thunderstorm highlights were withheld.
Otherwise, previous forecast (see below) is evolving as expected.
..Williams.. 05/09/2025
.PREV DISCUSSION... /ISSUED 0157 AM CDT Fri May 09 2025/
...Synopsis...
Amplified mid-level flow will continue across the CONUS today as a
broad upper low gradually moves eastward. Western US ridging will
also amplify, forcing stronger flow aloft over the northern US. At
the surface, a cold front will move south across the Northern Plains
and Great Lakes. Relatively mild and wet conditions will prevent
broader fire-weather concerns over much of the country, though a few
drier thunderstorms are possible along the cold front.
...Northern Plains and Great Lakes...
As the cold front progresses southward, isolated thunderstorms are
likely to form along and ahead of it through the heat of the day.
With relatively modest moisture (PWAT values around 0.8 inches)
these storms are expected to be relatively high based. A mixed mode
of wet/occasional dry storms is possible with some lightning risk
over recent dry fuels. While coverage of the drier storms appears
limited, increasingly dry and breezy conditions behind the cold
front could allow for some lightning ignitions and localized
fire-weather concerns.
U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 090658
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0158 AM CDT Fri May 09 2025
Valid 101200Z - 111200Z
...NO CRITICAL AREAS...
...Synopsis...
An upper ridge will shift into the Plains on Saturday, as a compact
shortwave trough exits the Northeast. Beneath the building ridge, an
upper low will meander about the Southeastern US as the mid-level
flow pattern remains blocked. Troughing will slowly deepen over the
eastern Pacific amplifying the upper-level pattern.
...Northern Plains...
Despite the relatively stagnant upper air pattern strong flow aloft
will begin to move over the Ridge across the Rockies and into the
northern US. This will support slow deepening of a lee trough
Saturday afternoon. Low-level winds will veer to southerly and
strengthen through the weekend as dry surface conditions develop.
While widespread critical RH and winds are not expected, a few hours
of southerly gusts of 15-20 mph and RH below 35% are possible. This
appears most likely over parts of the Dakotas and western MN. As
fuels continue to dry, locally elevated fire-weather conditions may
develop. However, the lack of stronger winds and overlap with the
driest fuels should prevent more widespread concerns for Saturday.
..Lyons.. 05/09/2025
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 082151
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0451 PM CDT Thu May 08 2025
Valid 101200Z - 161200Z
An upper-level ridge over the West will begin to shift eastward over
the central US and Great Lakes this weekend through early next week
as an upper-level trough moves into the West. Above normal
temperatures will shift from the northern Intermountain West Day
3/Saturday to over the northern Plains and Great Lakes Day 4/Sunday
into early next week. Scattered precipitation will fall across the
northern half to two-thirds of the West, with mountain snow,
especially in the northern Rockies. An upper low will slowly migrate
east-northeast from the Lower Mississippi Valley over the Southeast
through mid-next week. Heavy precipitation is expected from Florida
and the Deep South through the Carolinas.
...Day 4/Sunday - Day 5/Monday: northern Plains into the Upper
Midwest...
Southerly flow will strengthen over the Plains, especially the
northern Plains into the Upper Midwest this weekend through early
next week. With above normal temperatures and the dry return flow,
elevated to critical fire weather conditions are likely Day 4/Sunday
- Day 5/Monday with a 40% probability introduced. There remains some
uncertainty regarding when/where the low-level moisture will
increase across the central/northern Plains into the Upper Midwest.
Fuels guidance indicates receptive fuels, including certain fuels
entering or already in there spring dip.
There is the possibility of isolated dry thunderstorms from the
Nebraska Panhandle into the western Dakotas Day 4/Sunday - Day
5/Monday. However, there is too much forecast uncertainty to include
probabilities at this time.
...Great Basin into the Southwest...
As the deep upper-level trough moves into the West, dry/windy
conditions will overspread the Intermountain West, especially from
the Great Basin through the Southwest. The dry/windy conditions will
start Day 3/Saturday from the interior Pacific Northwest and
western/northern Great Basin and shift south/east across the
Intermountain West through Day 6/Tuesday. Recent precipitation has
reduced fuel receptiveness across these areas, but portions of the
Southwest may need to be included in future outlooks, especially if
probabilities of high-end critical to extremely critical conditions
increase.
..Nauslar.. 05/08/2025