U.S. & Canada 00-UTC 48 Hour Surface Smoke Forecast
Map is in operation from early April through October 31
U.S. Day 1 Fire Weather Outlook
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 121510
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0910 AM CST Tue Nov 12 2024
Valid 121700Z - 131200Z
The Elevated area in the Northeast was expanded southward based on
current observations (winds gusting 20-45 mph, RH of 40-60%) and the
latest high-resolution forecast guidance. RH and temperatures will
be close to elevated criteria, but wind gusts of 25-50 mph and near
to record setting high fire danger will create elevated to locally
critical fire weather conditions in the outlook area.
The Elevated area in southern California remains on track. Overnight
RH recovery was moderate to excellent with north-northwest wind
gusts of 25-60 mph early this morning. The strongest winds will
struggle to overlap with elevated/critical RH, but elevated fire
weather conditions remain likely in portions of the Transverse
Ranges/vicinity, primarily on southern/ocean-facing slopes.
..Nauslar.. 11/12/2024
.PREV DISCUSSION... /ISSUED 0158 AM CST Tue Nov 12 2024/
...Synopsis...
...Southern California...
A weak cold front will move across southern California through the
morning. Behind this frontal passage, gusty northwest winds
will be enhanced near favored downslope terrain features across
Santa Barbra and Ventura Counties. Relative humidity will hover
around elevated thresholds. Relative humidity will decrease,
especially at mid/upper slopes, below critical relative humidity
thresholds with poor overnight recovery tonight into D2/Wednesday
morning. However, winds are expected to weaken below thresholds
during this period. An Elevated delineation was maintained with this
outlook.
...New England...
Gusty northwesterly flow will overlap relative humidity reductions
to 35-40 percent across New England this afternoon. Though relative
humidity will be marginal, recent fire activity has shown fuels in
this region are receptive to fire spread with drought conditions and
very little recent rainfall. An Elevated delineation was included to
cover this threat, given the potential for strong and gusty winds.
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 121900
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0100 PM CST Tue Nov 12 2024
Valid 131200Z - 141200Z
The Elevated area was expanded slightly based on the latest
high-resolution forecast guidance and current dry/windy conditions.
Elsewhere, locally elevated conditions are possible in portions in
southwest Texas and along the Sierra Front. Locally elevated
conditions are also possible in the Appalachians from
Tennessee-North Carolina border through the West Virginia-Virginia
border as southeast winds strengthen with some downslope enhancement
ahead of precipitation Wednesday night.
..Nauslar.. 11/12/2024
.PREV DISCUSSION... /ISSUED 0200 AM CST Tue Nov 12 2024/
...Synopsis...
Gusty post-frontal off-shore flow will continue across portions of
the Northeast from far eastern PA and southern NJ extending
northeast through southern New England. A very dry air mass will
remain in place with relative humidity reductions to around 30-35
percent likely. Given the drought conditions and receptive fuels in
this region, an Elevated delineation was maintained with this
outlook. Locally Critical conditions may be possible, though the
limited spatial extent of this threat precludes the need to include
a Critical area at this time.
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 122135
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0335 PM CST Tue Nov 12 2024
Valid 141200Z - 201200Z
Upper-level troughing is expected over both the East and West Coasts
Day 3/Thursday - Day 5/Saturday, with upper-level ridging slowly
shifting from over the central US to over portions of the eastern
US. There is forecast uncertainty regarding how this amplified
upper-level pattern progresses early next week, which will have
ramifications for potential fire weather concerns in
southern/central California and the Northeast.
...Northeast and Mid-Atlantic...
An approaching warm front with associated cloud cover and possible
shower activity will limit fire weather concerns across the
Mid-Atlantic and into portions of the Northeast on Day 3/Thursday.
However, dry/breezy conditions are likely to develop across portions
of the Mid-Atlantic and Northeast Day 4/Friday - Day 6/Saturday.
Given the recent drought, lack of forecast rain, and near to record
high fire danger, 40% probabilities were expanded and introduced
during what appears to be a multi-day fire weather episode. Some
forecast uncertainty remains regarding forecast precipitation and
where the greatest overlap of elevated/critical winds/RH will be,
but confidence is increasing in at least elevated fire weather
conditions for portions of New Jersey, eastern Pennsylvania, the
Hudson Valley/vicinity, and southern New England late this week
through the weekend.
...Southern/central California...
Breezy/gusty north-northwest winds are possible in portions of
central/southern California Day 5/Saturday into Day 7/Monday as
multiple cold fronts sweep south and east over the region. The
southern extent of forecast precipitation and the magnitude of these
winds remain uncertain precluding 40% areas at this time. Confidence
is increasing in an offshore/Santa Ana wind event mid-next week,
which is on the edge of the outlook period. This event may start on
Day 8/Tuesday and last multiple days. This will be monitored and if
trends hold, probabilities will likely be added in subsequent
extended outlooks.
..Nauslar.. 11/12/2024
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