Great Falls, MT...Havre, MT...Miles City, MT...Lewistown, MT...Glendive, MT...
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 210803
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0303 AM CDT Fri Jul 21 2017
Valid 211200Z - 221200Z
...CRITICAL FIRE WEATHER AREA FOR CENTRAL/EASTERN MONTANA...
The main belt of westerlies is expected to remain across the
northern tier of states today. An upper trough is expected to move
eastward across the Canadian Prairie provinces, as an associated
surface cyclone moves from eastern Montana into the upper Midwest
and a trailing cold front sweeps through portions of the
...Portions of Montana into the far western Dakotas...
Dry west-northwesterly low-level flow will develop in the wake of
the frontal passage today. While temperatures will be somewhat
cooler compared to previous days, sufficient heating of a dry
airmass will result minimum RH values of 10-20% across much of
Montana into the far western Dakotas. The greatest wind speeds are
still expected across north-central into eastern MT, where 20-25 mph
sustained winds are expected this afternoon, resulting in a threat
of critical fire weather conditions. Surrounding the critical area,
elevated to locally critical conditions are expected from northwest
MT into the far western Dakotas, where winds may be slightly weaker
but very low RH values are still expected. Some expansion of the
critical area to the east-southeast may be required in the Day 1
update depending on trends in short-term obs and guidance.
...Snake River Valley of Idaho...
Modestly enhanced west-southwesterly winds still appear possible
across portions of the Snake River valley this afternoon. Sustained
wind speeds of 15-20 mph combined with minimum RH values of 7-15%
will result in a threat of elevated fire weather conditions.
...Please see www.spc.noaa.gov/fire for graphic product...
CLICK FOR DAY 1 FIREWX AREAL OUTLINE PRODUCT (KWNSPFWFD1)