Red Flag Warning issued December 19 at 1:58AM MST until December 20 at 12:00AM MST by NWS Denver CO
...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND
IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND
9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY...
Strong west winds, sustained 45-55 mph with gusts upwards of 85-
105 mph, are expected in the foothills of Larimer, Boulder and
Jefferson Counties beginning early Friday morning. Relative
humidity values are expected to drop into the low teens, possibly
upper single digits. While Red Flag conditions, critical fire
weather, are expected across a larger area in northern Colorado,
the most extreme conditions are expected to be along Highway 93
from Jefferson County into Boulder County and along US-36 north of
Boulder to the Larimer County line and westward. There will be a
high potential for fast moving wildfires, should any new starts
occur.
Winds toward I-25 and eastward will be slower to develop, and
also speeds will be considerably lighter. That said, gusts of 25-
40 mph are still expected to combine with very low humidity and
cured grasses to support critical fire weather conditions.
Such conditions may be a longer duration than usual, with
potential for low humidity to extend well into the evening hours.
* AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243.
* TIMING...From 10 AM this morning to midnight MST tonight.
* WINDS...West 15 to 25 mph with gusts up to 60 mph possible
west of I-25, and gusts to 40 mph possible along and east of I-
25.
* RELATIVE HUMIDITY...As low as 12 percent.
* IMPACTS...Conditions will be favorable for rapid fire spread.
Avoid outdoor burning and any activity that may produce a
spark and start a wildfire.
A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
Varoitus voimassa pe klo 19:00 - la klo 9:00
