Red Flag Warning issued July 21 at 5:10AM PDT until July 21 at 10:00PM PDT by NWS Pendleton OR

…VERY HOT, DRY, AND UNSTABLE CONDITIONS CONTINUE TODAY…

A strong ridge of high pressure will remain over the area
producing hot dry and unstable conditions especially to eastern
portions of central Oregon. A weak weather disturbance will move
up the coast helping to trigger isolated to scattered
thunderstorms in central Oregon today through evening.

* AFFECTED AREA…Fire Weather Zones 611 Deschutes National
Forest -minus Sisters Ranger District and 640 Central
Mountains of Oregon.

* TIMING…Noon to 10 PM Sunday.

* RELATIVE HUMIDITY…As low as 10 percent.

* TEMPERATURES…Up to 100.

* THUNDERSTORMS…Isolated to widely scattered. Lightning
activity level of 2 to 3.

* OUTFLOW WINDS…35 to 45 mph. Thunderstorm outflow winds may
result in erratic fire spread.

* IMPACTS…Any lightning strikes combined with hot and dry
conditions could cause new fire starts.
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.