Weather Alerts for OR Cascades

Issued by the National Weather Service

Red Flag Warning  RED FLAG WARNING   Red Flag Warning
OR CASCADES

Areas Affected:
South Central Oregon Coast - Umpqua Basin - Umpqua National Forest - Southern Oregon Coast - Western Siskiyou National Forest - Western Rogue Basin including the Illinois Valley - Eastern Rogue Valley - Southern Oregon Cascades
Effective: Sat, 7/20 11:41am Updated: Sat, 7/20 11:30pm Urgency: Expected
Expires: Sun, 7/21 5:00am Severity:  Severe  Certainty: Likely

 
Details:
An upper level low will move up from the south along the
California coast late this afternoon, and will tap into
increasing mid-level moisture. Meanwhile, elevated instability
will increase and this combined with a moderate to strong trigger
could result in isolated to scattered thunderstorms this evening
into Sunday morning, and again Sunday afternoon and evening. Given
how dry fuels are, along with continued hot temperatures,
lightning efficiency will be high to very high for fire starts.

The National Weather Service in Medford has replaced the Fire
Weather Watch with a Red Flag Warning, which is in effect from 5
PM this afternoon to 8 AM PDT Sunday.

* IMPACTS...Given the prolonged stretch of very hot and very dry
conditions, lightning efficiency will be high to very high for
fire starts. Additionally, gusty outflow winds will allow for
new and existing fires to grow rapidly out of control.

* AFFECTED AREA...All of Fire Zones 615, 616, 617, 618, 619,
620, 622, and 623.

* THUNDERSTORMS...Isolated to scattered thunderstorms are expected
late tonight into early Sunday morning. Lightning strikes
outside of precipitation cores are possible and cause for
concern.

* OUTFLOW WINDS...Gusts up to 40 mph. These outflow winds can
travel up to 50 miles away from the thunderstorm that caused
it.

* DETAILED URL...View the hazard area in detail at
https://www.wrh.noaa.gov/map/?wfo=mfr

Information:
Avoid tossing burning cigarettes on the ground, parking hot
vehicles on dry vegetation, and using equipment that can cause
sparks. Follow all fire restrictions. Find links to restrictions
at weather.gov/medford/wildfire. One less spark, one less
wildfire.

If you have not packed your evacuation kit yet, now is the time
to do so. This includes items like important documents and
essentials you cannot live without. Fill your vehicle's fuel
tank. Visit ready.gov/kit for more information.

Plan now to avoid using equipment that could cause sparks during
the period when critical weather conditions are possible. Visit
weather.gov/medford/wildfire for links to fire restrictions in
your area.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are either occurring now or will shortly. These conditions
promote rapid spread of fire which may become life threatening.
Evacuate if ordered to, or if a fire threatens.

Red Flag Warning  RED FLAG WARNING   Red Flag Warning
OR CASCADES

Areas Affected:
Deschutes National Forest - minus Sisters Ranger District - Central Mountains of Oregon
Effective: Sat, 7/20 9:21pm Updated: Sat, 7/20 11:30pm Urgency: Expected
Expires: Sun, 7/21 10:00am Severity:  Severe  Certainty: Likely

 
Details:
...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED THROUGH SUNDAY...

...ISOLATED TO SCATTERED THUNDERSTORMS SUNDAY AFTERNOON AND
EVENING...

A strong ridge of high pressure will remain over the area into
Sunday bringing hot dry and unstable conditions especially to
eastern portions of central Oregon. A weak weather disturbance
will move along the west side of the ridge and help to trigger
isolated to scattered thunderstorms in central Oregon Sunday
afternoon and 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 12 percent.

* TEMPERATURES...Up to 99.

* 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.

Information:
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.