ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 151637
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1137 AM CDT Thu May 15 2025
Valid 151700Z - 161200Z
Cooler temperatures and lighter boundary layer winds will mitigate
fire weather concerns across southeastern Arizona today,
necessitating a slight pullback in Elevated highlights. Stronger
mid-level winds and efficient mixing will continue to support an
elevated fire weather threat across southern New Mexico into far
west Texas. Downslope/leeward enhancement of surface winds should
also occur across the High Plains of northeastern New Mexico.
..Williams.. 05/15/2025
.PREV DISCUSSION... /ISSUED 0104 AM CDT Thu May 15 2025/
...Synopsis...
An upper trough will quickly move eastward over the central US with
accompanying strong mid-level flow. A deepening lee cyclone will
intensify further as it move into the Upper Midwest tonight. As the
low deepens, a Pacific cold front and tailing dryline will move
quickly through the Rockies, into the Plains and Midwest States.
Cooler temperatures, gusty westerly winds and some precipitation are
possible along and behind the front through tonight. Elevated
fire-weather conditions are possible over parts of the southern
Plains and Southwest.
...Southwest...
Persistent westerly flow will continue across the Southwest today
and tonight as a weak pacific front moves over the Rockies. This
will support another day of dry and windy conditions across parts of
eastern AZ and southern NM. Despite somewhat cooler temperatures
behind the front, downsloping and deep vertical mixing will support
RH below 20% and winds of 15-20% amidst dry fuels. Widespread
elevated to locally critical conditions are expected. Some
fire-weather risk may also extend into West TX behind an eastward
mixing dryline. However, winds here may be somewhat weaker despite
very warm surface temperatures and lower humidity. Locally elevated
conditions are possible within drying fuels.
...Central plains and Midwest...
Gusty westerly winds are possible behind the advancing cold front
from parts of the central Plains into western IA and MO this
afternoon. While gusts may reach 20-25 mph, RH values are not
expected to be critical with cooler temperatures. Additionally,
recent wetting rainfall may temporarily limit available fuels. This
suggests any fire-weather concerns will be localized and short
lived.
U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 151949
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0249 PM CDT Thu May 15 2025
Valid 161200Z - 171200Z
A dry, post-frontal air mass will push through portions of the
Midwest this evening, priming northern Illinois for substantially
lower relative humidity for Friday. As a surface low moves into the
Great Lakes region along with accelerating mid-level winds, strong
surface winds of 20-25 mph from the south and southwest will develop
by late morning. The stronger winds combined with relative humidity
falling into the 20-25 percent range will support elevated fire
weather conditions across northern Illinois for Friday morning/early
afternoon. Fire weather threat remains conditional for the Chicago
area as line of showers and thunderstorms and subsequent rainfall
expected this afternoon/evening could limit fire spread potential
for Friday.
..Williams.. 05/15/2025
.PREV DISCUSSION... /ISSUED 0104 AM CDT Thu May 15 2025/
...Synopsis...
Fire-weather potential across the CONUS is relatively low Friday. In
the wake of the departing upper trough, shortwave ridging is
expected over the southern Plains and Southwest. This will
temporarily slow stronger mid-level flow as a Pacific front shifts
eastward. With only modest flow aloft and at the surface, strong
winds are not expected over the driest fuels of the Southwest.
However, warm temperatures and low RH below 20% will remain likely.
This could support some localized fire-weather risk where westerly
winds could gust to 15 mph closer to the terrain. Otherwise,
increasing surface moisture and recent rainfall will largely
preclude fire-weather concerns Friday outside of localized dry and
breezy conditions over parts of the Midwest. However, this is not
expected to be widespread.
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 142153
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0453 PM CDT Wed May 14 2025
Valid 161200Z - 221200Z
An upper-level trough and associated surface low over the Northern
Plains on Day 3/Friday will push through the Great Lakes Region by
Day 5/Sunday. An active upper-wave pattern will persist across CONUS
with another upper-level trough moving into the Western U.S. by Day
5/Sunday, gradually pushing into the Eastern U.S. through Day 8
where widespread rainfall is expected. Fire weather concerns should
remain concentrated across portions of the Southwest where dry fuels
and recent active fire activity amid drought conditions have
occurred. A broad ridging pattern begins to build across the West by
the middle of next week promoting generally light surface winds but
above normal temperatures and dry conditions, which will aid in the
curing/drying of fuels.
...Southwest...
A multi-day fire weather threat will persist across parts of the
southwest through early next week. Modest mid-level flow over a
well-mixed boundary layer should allow for gusty southwest winds
across southeastern Arizona and southern New Mexico on Day
4/Saturday. A mid-level jet max rounding the base of the incoming
upper-level trough into the western U.S. should promote at least
Elevated if not Critical fire weather conditions across southern New
Mexico where dry fuels and drought persist on Day 5-6/Sunday-Monday.
40 percent Critical probabilities were added to reflect higher
confidence of fire weather threat.
..Williams.. 05/14/2025