Red Flag Warning November 18-19, 2021

Red Flag Warning

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
511 AM MST Thu Nov 18 2021

...DANGEROUS FIRE WEATHER LIKELY OVER THE EAST SLOPES OF THE FRONT RANGE THIS AFTERNOON AND TONIGHT...

.Very dry air will surface across northern Colorado today, with humidities of 5-10% possible in the Front Range foothills. Winds will mainly be above 9000 feet this morning, but will become more widespread this afternoon and then stronger this evening. It will remain dry and windy overnight in the foothills with little cooling. Conditions are expected to improve Friday morning and humidities increase, but it will still be dry and windy on Friday.

COZ215-216-182015-
/O.CON.KBOU.FW.W.0022.211118T1700Z-211119T1200Z/
Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet-
511 AM MST Thu Nov 18 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 5 AM MST FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...FIRE WEATHER ZONES 215 AND 216...

* Affected Area...Fire Weather Zones 215 and 216.

* Timing...Very dry air will become widespread this morning. West winds will gradually increase today and become stronger this evening. Poor humidity recovery is expected until late tonight.

* Winds...Becoming southwest 10 to 20 mph today, then west 15 to 25 mph with gusts up to 40 mph tonight.

* Relative Humidity...As low as 6 percent.

* Impacts...Any fire that starts will have the potential to spread rapidly. Extreme fire behavior will be possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.