U.S. Day 1 Fire Weather Outlook
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 281500
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1000 AM CDT Sun May 28 2023
Valid 281700Z - 291200Z
The previous forecast remains on track with only minor adjustments
made to reflect trends in recent guidance. Surface observation
through the Red River Valley of the north show RH already falling
into the 20-30% range with strengthening winds. Recent guidance
continues to show a general cool/moist bias, so forecast
modifications were made based on the drier/windier solutions.
Localized elevated conditions are possible across parts of southeast
AZ into southwest NM, but weak synoptic winds will limit this
potential to areas that see terrain-augmented winds.
..Moore.. 05/28/2023
.PREV DISCUSSION... /ISSUED 1252 AM CDT Sun May 28 2023/
...Synopsis...
While losing amplitude, a shortwave trough will lift northeast into
the northern Plains and upper Midwest today. At the surface, another
lee trough will develop in the High Plains with a surface high
remaining in place over Ontario/Quebec.
...North Dakota/Minnesota...
Dry surface trajectories out of the surface high will continue for
another day. With the strength of the lee trough being similar to
previous days, enhanced southerly winds will be present across the
Red River Valley vicinity. RH could fall to around 20% during the
afternoon. Winds will generally be light, but 15-20 mph will occur
on a broad enough basis to support elevated fire weather. Despite
green up, fuel reports suggest enough dry fuels exist to support a
larger fire should an ignition occur.
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 281754
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1254 PM CDT Sun May 28 2023
Valid 291200Z - 301200Z
...NO CRITICAL AREAS...
No changes to the forecast are needed. Recent ensemble guidance has
trended towards slightly higher probability of 15+ mph winds with
15% RH across parts of southern NV into northwest AZ/southwest UT,
but recent ERC values are near seasonal normal and should mitigate
more robust fire weather concerns. See the previous discussion for
additional details.
..Moore.. 05/28/2023
.PREV DISCUSSION... /ISSUED 1259 AM CDT Sun May 28 2023/
...Synopsis...
The mid-level trough in the upper Midwest will continue to move
northeast and weaken with time on Monday. This will allow the
surface trough to progress farther east into the Plains. Similarly,
the surface high will migrate towards the New England coast.
Southerly winds will continue across parts of the Dakotas and
Minnesota. Despite the continued windy conditions, the eastward
progression of the surface high should allow for trajectories to
advect greater moisture into the region. That being said, RH is
expected to remain above critical thresholds on Monday.
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 281947
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0247 PM CDT Sun May 28 2023
Valid 301200Z - 051200Z
Fire weather concerns will likely remain limited to the southwestern
U.S. through the extended period where recent ensemble guidance
continues to show a weak signal for appreciable precipitation.
Long-range guidance also maintains a signal for anomalously
high-amplitude upper ridging over the central CONUS with an active
sub-tropical stream across northern Mexico into the Gulf of Mexico.
This will allow for a series of shortwave perturbations to propagate
along the international border that may support breezy winds across
AZ/NM. While localized elevated conditions will be possible each
day, a somewhat more robust wave appears likely during the
D4/Wednesday time frame across the Southwest that should support
more widespread 15-20 mph winds across southeast AZ into NM per
ensemble probabilities. Given the antecedent dry conditions and
little moisture return into the region prior to D5/Wednesday, fire
weather concerns appear probable (though confidence in the intensity
and coverage of the threat remains uncertain). Elsewhere across the
CONUS, warm and dry conditions are expected across the Midwest/Great
Lakes region, but weak flow under the upper ridge will limit the
potential for robust/widespread fire weather concerns.
..Moore.. 05/28/2023
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