Alert archive / Oregon / Red Flag Warnings in 2020

Red Flag Warning 12, NWS Medford, OR

August 15, 2020Modoc County, Siskiyou County, California; 7 counties in Oregon

NWS Medford, OR issued this red flag warning at Aug 15, 2020, 11:49 AM PDT for Modoc County, Siskiyou County, California; 7 counties in Oregon. It took effect at Aug 16, 2020, 8:00 AM PDT. It was in force for 13 hr. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 15, 2020, 11:49 AM PDT (18:49 UTC)
In effect from
Aug 16, 2020, 8:00 AM PDT
Expired
Aug 16, 2020, 9:01 PM PDT
In force
13 hr
Issued by
NWS Medford, OR

Counties Modoc County, CA, Siskiyou County, CA, Douglas County, OR, Harney County, OR, Jackson County, OR, Josephine County, OR, Klamath County, OR, Lake County, OR, Lane County, OR

The radar

The Medford radar (KMAX), 95 km from the middle of the area, began a volume at 18:48 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Aug 16, 2:40 PM PDTTSTM WND GST 45Silver Lake, ORESTIMATED 40 TO 50 MPH WIND GUSTS NEAR THUNDERSTORM.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 6.8 hours before the alert went out and 84 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Medford/Jackson, OR at 12:00Z on 2020-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 12:00Z on 2020-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2675 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
61 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

205 
WWUS86 KMFR 151849
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
1149 AM PDT Sat Aug 15 2020

...Isolated to scattered thunderstorms with dry fuels Sunday...

.A disturbance will move northward through California tonight with
increasing moisture spreading into northern California and 
southern Oregon by Sunday morning. This disturbance will bring at 
least isolated thunderstorms to most of the area, with scattered 
thunderstorms developing, especially Sunday afternoon. The main 
concern is that some of the storms may initially start out elevated
Sunday morning, and thus dry. Any storms that do develop will have
the ability to produce cloud to ground lightning and strong, gusty
outflow winds. The gusty winds may also contribute to fire spread.
More thunderstorms are possible, especially east of the Cascades 
on Monday. 

ORZ624-625-161215-
/O.UPG.KMFR.FW.A.0010.200816T1800Z-200817T0600Z/
/O.NEW.KMFR.FW.W.0012.200816T1500Z-200817T0600Z/
/O.NEW.KMFR.FW.A.0011.200817T2000Z-200818T0600Z/
Klamath Basin and the Fremont-Winema National Forest-
South Central Oregon Desert including the BLM Land in Eastern Lake
and Western Harney Counties-
1149 AM PDT Sat Aug 15 2020

...RED FLAG WARNING IN EFFECT FROM 8 AM TO 11 PM PDT SUNDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 624 AND
625...

...FIRE WEATHER WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH
MONDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE
WEATHER ZONES 624 AND 625...

The National Weather Service in Medford has upgraded the Fire
Weather Watch to a Red Flag Warning...which is in effect from 8 AM
to 11 PM PDT Sunday. Another Fire Weather Watch has also been 
issued. This Fire Weather Watch is in effect from Monday afternoon 
through Monday evening. 

* Impacts: Lightning and high fire danger will likely result in new 
  fire starts. Gusty thunderstorm winds could contribute to fire 
  spread. Despite rainfall, initial attack resources could be 
  overwhelmed and holdover fires are possible.

* Affected area: 
  In South Central OR...Fire Weather Zones 624 and 625.

* Thunderstorms: Isolated to scattered thunderstorms are expected 
  Sunday morning through Sunday evening. Some may become strong 
  with gusty, erratic winds. More thunderstorms are possible Monday
  afternoon and evening.

* Wind: South 15 to 25 mph with gusts to 35 mph, except
  thunderstorm outflow wind gusts could reach 55 mph.

* View the hazard area in detail at:
 https://www.wrh.noaa.gov/mfr/HAZARD 

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential. 

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible Red
Flag Warnings.

&&

$$

CAZ285-161215-
/O.UPG.KMFR.FW.A.0010.200816T1500Z-200817T0600Z/
/O.NEW.KMFR.FW.W.0012.200816T1500Z-200817T0600Z/
/O.NEW.KMFR.FW.A.0011.200817T2000Z-200818T0600Z/
Modoc County Except for the Surprise Valley-
1149 AM PDT Sat Aug 15 2020

...RED FLAG WARNING IN EFFECT FROM 8 AM TO 11 PM PDT SUNDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 285...

...FIRE WEATHER WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH
MONDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE
WEATHER ZONE 285...

The National Weather Service in Medford has upgraded the Fire
Weather Watch to a Red Flag Warning...which is in effect from 8 AM
to 11 PM PDT Sunday. Another Fire Weather Watch has also been 
issued. This Fire Weather Watch is in effect from Monday afternoon 
through Monday evening. 

* Impacts: Lightning and high fire danger will likely result in new
  fire starts. Gusty thunderstorm winds could contribute to fire
  spread. Despite rainfall, initial attack resources could be
  overwhelmed and holdover fires are possible.

* Affected area: 
  In Northern CA...Fire Weather Zone 285.

* Thunderstorms: Isolated to scattered thunderstorms are expected 
  Sunday morning through Sunday evening. Some may become strong 
  with gusty, erratic winds. More thunderstorms are possible Monday
  afternoon and evening.

* Wind: South 10 to 20 mph with gusts up to 30 mph, except
  thunderstorm outflow wind gusts could reach 55 mph.

* View the hazard area in detail at:
  https://www.wrh.noaa.gov/mfr/HAZARD 

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential.

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible Red
Flag Warnings.

&&

$$

CAZ280>282-284-ORZ621>623-161215-
/O.UPG.KMFR.FW.A.0010.200816T1500Z-200817T0600Z/
/O.NEW.KMFR.FW.W.0012.200816T1500Z-200817T0600Z/
Western Klamath National Forest-
Central Siskiyou County Including Shasta Valley-Shasta-
Trinity National Forest in Siskiyou County-
Siskiyou County from the Cascade Mountains East and South to Mt
Shasta-Siskiyou Mountains-Eastern Rogue Valley-
Southern Oregon Cascades-
1149 AM PDT Sat Aug 15 2020

...RED FLAG WARNING IN EFFECT FROM 8 AM TO 11 PM PDT SUNDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 280...281...
282...284...621...622 AND 623...

The National Weather Service in Medford has upgraded the Fire
Weather Watch to a Red Flag Warning...which is in effect from 8 AM
to 11 PM PDT Sunday. 

* Impacts: Lightning and high fire danger will likely result in new
  fire starts. Gusty thunderstorm winds could contribute to fire 
  spread. Despite rainfall, initial attack resources could be 
  overwhelmed and holdover fires are possible.

* Affected area: 
  In Northern CA Fire Zones...280...281...282...284.
  In Southwest OR Fire Zones...621...622...623.

* Thunderstorms: Isolated to scattered thunderstorms are expected 
  Sunday morning through Sunday evening. Some may become strong 
  with gusty, erratic winds.

* Wind: South 10 to 20 mph with gusts up to 35 mph, except
  thunderstorm outflow wind gusts could reach 55 mph. 

* View the hazard area in detail at:
  https://www.wrh.noaa.gov/mfr/HAZARD 

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential.

&&

$$

ORZ617-161215-
/O.UPG.KMFR.FW.A.0010.200816T1800Z-200817T0600Z/
/O.NEW.KMFR.FW.W.0012.200816T1500Z-200817T0600Z/
Umpqua National Forest-
1149 AM PDT Sat Aug 15 2020

...RED FLAG WARNING IN EFFECT FROM 8 AM TO 11 PM PDT SUNDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 617...

The National Weather Service in Medford has upgraded the Fire 
Weather Watch to a Red Flag Warning...which is in effect from 8 AM
to 11 PM PDT Sunday. 

* Impacts: Lightning and high fire danger will likely result in new
  fire starts. Gusty thunderstorm winds could contribute to fire 
  spread. Despite rainfall, initial attack resources could be 
  overwhelmed and holdover fires are possible.

* Affected area: 
  In Southwest OR...Fire Weather Zone 617.

* Thunderstorms: Isolated to scattered thunderstorms are expected 
  Sunday morning through Sunday evening. Some may become strong 
  with gusty, erratic winds.

* Wind: West 5 to 10 mph with gusts up to 25 mph, except
  thunderstorm outflow wind gusts could reach 55 mph.

* View the hazard area in detail at:
https://www.wrh.noaa.gov/mfr/HAZARD

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential. 

&&

$$

MAS

Visit us at www.weather.gov/Medford
3 follow-up statements
591 
WWUS86 KMFR 161032
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
332 AM PDT Sun Aug 16 2020

...Isolated to scattered thunderstorms with dry fuels today...

.A disturbance will move northward through California with 
increasing moisture spreading into northern California and southern
Oregon this morning. This disturbance will bring at least isolated
to scattered thunderstorms as early as 9 AM Sunday morning. 
Another concern is that some of the storms may initially start out 
elevated Sunday morning, and thus dry. Any storms that do develop 
will have the ability to produce cloud to ground lightning and 
strong, gusty outflow winds. The gusty winds may also contribute to
fire spread. More thunderstorms are possible, especially east of 
the Cascades on Monday.

CAZ285-ORZ624-625-162300-
/O.CON.KMFR.FW.W.0012.200816T1500Z-200817T0600Z/
/O.CON.KMFR.FW.A.0011.200817T2000Z-200818T0600Z/
Modoc County Except for the Surprise Valley-
Klamath Basin and the Fremont-Winema National Forest-
South Central Oregon Desert including the BLM Land in Eastern Lake
and Western Harney Counties-
332 AM PDT Sun Aug 16 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM 8 AM THIS MORNING TO
11 PM PDT THIS EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR
FIRE WEATHER ZONES 624 AND 625...
...FIRE WEATHER WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOON
THROUGH MONDAY EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR
FIRE WEATHER ZONES 624 AND 625...

* Impacts:  Lightning and high fire danger will likely result in
new fire starts. Gusty thunderstorm winds could contribute to fire
spread. Despite rainfall, initial attack resources could be
overwhelmed and holdover fires are possible.

* Affected area: 
  In Northern CA Fire Zone....285.
  In South Central OR Fire Zones...624...625.

* Thunderstorms: Isolated to scattered thunderstorms are expected
Sunday morning through Sunday evening. Some may become strong with
gusty, erratic winds. More thunderstorms are possible Monday
afternoon and evening.

* Wind: South 10 to 20 mph with gusts up to 35 mph.

* View the hazard area in detail at:
https://www.wrh.noaa.gov/mfr/HAZARD

$$

CAZ280>282-284-ORZ617-621>623-162300-
/O.CON.KMFR.FW.W.0012.200816T1500Z-200817T0600Z/
Western Klamath National Forest-
Central Siskiyou County Including Shasta Valley-Shasta-
Trinity National Forest in Siskiyou County-
Siskiyou County from the Cascade Mountains East and South to Mt
Shasta-Umpqua National Forest-Siskiyou Mountains-
Eastern Rogue Valley-Southern Oregon Cascades-
332 AM PDT Sun Aug 16 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM 8 AM THIS MORNING TO
11 PM PDT THIS EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR
FIRE WEATHER ZONES 280...281...282...284...621...622 AND 623...

* Impacts:  Lightning and high fire danger will likely result in
new fire starts. Gusty thunderstorm winds could contribute to fire
spread. Despite rainfall, initial attack resources could be
overwhelmed and holdover fires are possible.

* Affected area: 
  In Northern CA Fire Zones...280...281...282...284.
  In Southwest OR Fire Zones...617...621...622...623.

* Thunderstorms: Isolated to scattered thunderstorms are expected
Sunday morning through Sunday evening. Some may become strong with
gusty, erratic winds.

* Wind: South 10 to 20 mph with gusts up to 35 mph.

* View the hazard area in detail at:
https://www.wrh.noaa.gov/mfr/HAZARD

$$


Visit us at www.weather.gov/Medford
320 
WWUS86 KMFR 161957
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
1257 PM PDT Sun Aug 16 2020

...Isolated to scattered thunderstorms with dry fuels this
afternoon and evening...

.Cloud to ground lightning this afternoon and evening will have 
the ability to produce new fire starts. Any storms can produce 
strong, gusty outflow winds which could contribute to fire spread. 
More thunderstorms are expected on Monday primarily east of the 
Cascades.

CAZ285-ORZ624-625-170600-
/O.UPG.KMFR.FW.A.0011.200817T2000Z-200818T0600Z/
/O.NEW.KMFR.FW.W.0013.200817T1900Z-200818T0600Z/
/O.CON.KMFR.FW.W.0012.000000T0000Z-200817T0600Z/
Modoc County Except for the Surprise Valley-
Klamath Basin and the Fremont-Winema National Forest-
South Central Oregon Desert including the BLM Land in Eastern Lake
and Western Harney Counties-
1257 PM PDT Sun Aug 16 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING
FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 285...
624 AND 625...

...RED FLAG WARNING IN EFFECT FROM NOON TO 11 PM PDT MONDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 285...
624 AND 625...

The National Weather Service in Medford has upgraded the Fire
Weather Watch for Monday to a Red Flag Warning...which is in 
effect from noon to 11 PM PDT Monday. 

* Impacts: Lightning and high fire danger will likely result in new
  fire starts. Gusty thunderstorm winds could contribute to fire 
  spread. Despite rainfall, initial attack resources could be 
  overwhelmed and holdover fires are possible.

* Affected area: 
  In Northern CA Fire Zone....285.
  In South Central OR Fire Zones...624...625.

* Thunderstorms: Isolated to scattered thunderstorms are expected
  through this evening. Some may become strong with gusty, erratic
  outflow winds, brief heavy rain and hail. Another round of 
  showers and thunderstorms are expected Monday afternoon and 
  evening.

* Wind: South 15 to 25 mph with gusts to 35 mph, except 55 to 60 
  mph in thunderstorm outflows.

* View the hazard area in detail at:
  https://www.wrh.noaa.gov/mfr/HAZARD 

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential. 

&&

$$

CAZ284-170600-
/O.NEW.KMFR.FW.W.0013.200817T1900Z-200818T0600Z/
/O.CON.KMFR.FW.W.0012.000000T0000Z-200817T0600Z/
Siskiyou County from the Cascade Mountains East and South to Mt
Shasta-
1257 PM PDT Sun Aug 16 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING
FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 284...

...RED FLAG WARNING IN EFFECT FROM NOON TO 11 PM PDT MONDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 284...

The National Weather Service in Medford has issued a Red Flag
Warning...which is in effect from noon to 11 PM PDT Monday.

* Impacts: Lightning and high fire danger will likely result in new
  fire starts. Gusty thunderstorm winds could contribute to fire 
  spread. Despite rainfall, initial attack resources could be 
  overwhelmed and holdover fires are possible.

* Affected area: 
  In Northern CA...Fire Weather Zone 284.

* Thunderstorms: Isolated to scattered thunderstorms are expected
  through this evening. Some may become strong with gusty, erratic
  outflow winds, brief heavy rain and hail. Another round of 
  showers and thunderstorms are expected Monday afternoon and 
  evening.

* Wind: South 15 to 25 mph with gusts to 35 mph, except 55 to 60 
  mph in thunderstorm outflows. 

* View the hazard area in detail at:
  https://www.wrh.noaa.gov/mfr/HAZARD 

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential. 

&&

$$

CAZ280>282-ORZ617-621>623-170600-
/O.CON.KMFR.FW.W.0012.000000T0000Z-200817T0600Z/
Western Klamath National Forest-
Central Siskiyou County Including Shasta Valley-Shasta-
Trinity National Forest in Siskiyou County-Umpqua National Forest-
Siskiyou Mountains-Eastern Rogue Valley-Southern Oregon Cascades-
1257 PM PDT Sun Aug 16 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING
FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 280...
281...282...617...621...622 AND 623...

* Impacts: Lightning and high fire danger will likely result in new 
  fire starts. Gusty thunderstorm winds could contribute to fire 
  spread. Despite rainfall, initial attack resources could be 
  overwhelmed and holdover fires are possible.

* Affected area: 
  In Northern CA Fire Zones...280...281...282.
  In Southwest OR Fire Zones...617...621...622...623.

* Thunderstorms: Isolated to scattered thunderstorms are expected
  through this evening. Some may become strong with gusty, erratic
  winds, brief heavy rain and hail.

* Wind: South 15 to 25 mph with gusts to 35 mph, except 55 to 60
  mph in thunderstorm outflows.

* View the hazard area in detail at: 
  https://www.wrh.noaa.gov/mfr/HAZARD

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential. 

$$

MAS

Visit us at www.weather.gov/Medford
542 
WWUS86 KMFR 170401
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
901 PM PDT Sun Aug 16 2020

...Isolated to scattered thunderstorms with dry fuels Monday..

.Storms could start early Monday morning over Northern California
and won't have much rainfall with them in the morning. Cloud to 
ground lightning Monday will have the ability to produce new fire 
starts. Any storms can produce strong, gusty outflow winds which 
could contribute to fire spread.

ORZ624-625-172215-
/O.CAN.KMFR.FW.W.0012.000000T0000Z-200817T0600Z/
/O.EXT.KMFR.FW.W.0013.200817T1800Z-200818T0600Z/
Klamath Basin and the Fremont-Winema National Forest-
South Central Oregon Desert including the BLM Land in Eastern Lake
and Western Harney Counties-
901 PM PDT Sun Aug 16 2020

...RED FLAG WARNING NOW IN EFFECT FROM 11 AM TO 11 PM PDT MONDAY
FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 624 AND
625...

...THE CURRENT RED FLAG WARNING FOR SUNDAY IS CANCELLED FOR 
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 624 AND 
625...

* Impacts:  Lightning and high fire danger will likely result in
new fire starts. Gusty thunderstorm winds could contribute to fire
spread. Despite rainfall, initial attack resources could be
overwhelmed and holdover fires are possible.

* Affected area: 
  In South Central OR...Fire Weather Zones 624 and 625.

* Thunderstorms: Isolated to scattered thunderstorms are expected
through this evening. Some may become strong with gusty, erratic
outflow winds, brief heavy rain and hail. Another round of showers
and thunderstorms are expected Monday afternoon and evening.

* Wind: South 10 to 20 mph with gusts up to 30 mph.

* View the hazard area in detail at:
https://www.wrh.noaa.gov/mfr/HAZARD

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential. 

&&

$$

CAZ282-172215-
/O.CAN.KMFR.FW.W.0012.000000T0000Z-200817T0600Z/
/O.EXB.KMFR.FW.W.0013.200817T1500Z-200818T0600Z/
Shasta-Trinity National Forest in Siskiyou County-
901 PM PDT Sun Aug 16 2020

...RED FLAG WARNING IN EFFECT FROM 8 AM TO 11 PM PDT MONDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 282...

...THE CURRENT RED FLAG WARNING FOR SUNDAY IS CANCELLED FOR 
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 282...

The National Weather Service in Medford has issued a Red Flag
Warning...which is in effect from 8 AM to 11 PM PDT Monday. 

* Impacts:  Lightning and high fire danger will likely result in
new fire starts. Gusty thunderstorm winds could contribute to fire
spread. Despite rainfall, initial attack resources could be
overwhelmed and holdover fires are possible.

* Affected area: 
  In Northern CA...Fire Weather Zone 282.

* Thunderstorms: Isolated to scattered thunderstorms are expected
through this evening. Some may become strong with gusty, erratic
winds, brief heavy rain and hail.

* Wind: Southeast 5 to 10 mph with gusts up to 25 mph.

* View the hazard area in detail at:
https://www.wrh.noaa.gov/mfr/HAZARD

* View the hazard area in detail at:
  https://www.wrh.noaa.gov/mfr/HAZARD 

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential. 

&&

$$

CAZ284-285-172215-
/O.CAN.KMFR.FW.W.0012.000000T0000Z-200817T0600Z/
/O.EXT.KMFR.FW.W.0013.200817T1500Z-200818T0600Z/
Siskiyou County from the Cascade Mountains East and South to Mt
Shasta-Modoc County Except for the Surprise Valley-
901 PM PDT Sun Aug 16 2020

...RED FLAG WARNING NOW IN EFFECT FROM 8 AM TO 11 PM PDT MONDAY
FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 284 AND
285...

...THE CURRENT RED FLAG WARNING FOR SUNDAY IS CANCELLED FOR 
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 284 AND 
285...

* Impacts:  Lightning and high fire danger will likely result in
new fire starts. Gusty thunderstorm winds could contribute to fire
spread. Despite rainfall, initial attack resources could be
overwhelmed and holdover fires are possible.

* Affected area: 
  In Northern CA...Fire Weather Zones 284 and 285.

* Thunderstorms: Isolated to scattered thunderstorms are expected
through this evening. Some may become strong with gusty, erratic
outflow winds, brief heavy rain and hail. Another round of showers
and thunderstorms are expected Monday afternoon and evening.

* Wind: South 5 to 15 mph with gusts up to 30 mph.

* View the hazard area in detail at:
https://www.wrh.noaa.gov/mfr/HAZARD

Precautionary/preparedness actions...

Abundant lightning on existing very dry fuels could cause numerous
new fire ignitions. Gusty and erratic outflow winds could also
create extreme fire growth potential. 

&&

$$

CAZ280-281-ORZ617-621>623-170515-
/O.CAN.KMFR.FW.W.0012.000000T0000Z-200817T0600Z/
Western Klamath National Forest-
Central Siskiyou County Including Shasta Valley-
Umpqua National Forest-Siskiyou Mountains-Eastern Rogue Valley-
Southern Oregon Cascades-
901 PM PDT Sun Aug 16 2020

...THE CURRENT RED FLAG WARNING FOR SUNDAY IS CANCELLED FOR 
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES 
280...281...617...621...622 AND 623...

The National Weather Service in Medford has cancelled the Red Flag
Warning.

No more storms are expected this evening. Isolated storms are still
expected Monday for Fire Weather Zones 
280...281...617...621...622..and 623. 

$$


Visit us at www.weather.gov/Medford

What forecasters said that day

The local office's own words before this red flag warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Medford, OR wrote its last area forecast discussion before this red flag warning went out at Aug 15, 9:29 AM PDT, 2 hours 20 minutes earlier.

Area forecast discussion, Aug 15, 9:29 AM PDT, 2 hours 20 minutes before
Area Forecast Discussion
National Weather Service Medford OR
929 AM PDT Sat Aug 15 2020

.UPDATE...
Updates to the forecast this morning were to adjust the smoke,
haze, and fog in the forecast for areas west of the Cascades for
today. Smoke and haze from the Red Salmon Fire is pushing
northward along the coast. This will continue today and some of it
will also spread across the inland west side as the afternoon and
evening winds bring it eastward. Also, wording for thunderstorms
today was adjusted from isolated to slight chance as little, if
any, are expected to occur.

&&

.DISCUSSION...
It will be heating up this afternoon through this evening to near
record levels for this calendar date. There continues to be a
slight chance of thunderstorms across the inland west side,
portions of NorCal, and portions of the east side this afternoon
and evening. However, the majority of the model guidance
continues to show nothing to very little happening today in terms
of thunderstorms, so removed the isolated wording and went with
slight chance instead. Numerical models suggest that the greatest
threat, albeit small, for thunderstorms today is from the Marble
Mountains to western edge of the Shasta Valley northward over the
Siskiyous and into Jackson County to north and northeast of Crater
Lake NP, with a lesser threat across northern Klamath County,
Lake, and Modoc counties. If a storm does form, it will produce
little or no rainfall.

Sunday and Monday the thunderstorm threat increases across the
area. Based on the preceding dryness, heat, gusty wind potential,
and the threat of isolated to scattered thunderstorms, fire
weather watches are in effect for most areas east of Interstate 5
for Sunday afternoon and evening. ~BTL

&&

.AVIATION...For the 15/12Z TAFs...Clear skies are expected to
continue for most areas through the TAF period. One exception is
smoke from the Red Salmon Fire, which will reduce visibilities in
much of western siskiyou County, with haze potentially spreading to
the north and northeast. There may be some patchy IFR/MVFR
conditions that develop in the Coquille Basin and near KOTH early
this morning. If anything does develop, it will be short lived with
conditions improving to VFR by 16-17z today. Additionally tonight,
expect areas of IFR/LIFR conditions to affect the coast as a
southerly surge brings low clouds and patchy fog to coastal areas.
-CC

&&

.MARINE...Updated 300 AM PDT Saturday 15 August 2020...Winds and
seas will gradually subside today as the thermal trough gradually
moves inland. Steep seas are expected to linger across the waters
this morning with some very steep seas through early morning  for
the outer waters south of Gold Beach. Steep seas persist across the
outer waters through the afternoon then seas will diminish below
small craft advisory levels.

A southerly wind surge is expected late today into tonight. This is
expected to bring some low clouds and patchy fog to the waters by
tonight. Southerly winds continue through Sunday as a disturbance
moves up from the south. Any precipitation with showers or
thunderstorms associated with this disturbance is expected to remain
inland though. Relatively light winds and seas will then continue
through Tuesday. A thermal trough is expected to return Wednesday
and Thursday. Of note, models have trended weaker with this thermal
trough. Steep seas are possible during this period, mainly south of
Cape Blanco. -CC

&&

.FIRE WEATHER...Updated 1015 PM PDT Friday 14 August 2020...
A strong upper ridge will build into the area this weekend and
persist into next week bringing the hottest stretch of weather this
summer thus far. It will be very hot across inland areas with high
temperatures challenging or exceeding record levels. Humidities will
remain rather low as well, but the upper level trough off the West
Coast will allow deep southerly flow to bring mid-level moisture
northward into the area Saturday. This will bring an isolated threat
of lightning to portions of the area during the afternoon and
evening. Moisture, forcing and instability aren't overly robust, but
models support isolated thunderstorm development. Mid-level flow is
shown to be around 15 kt or so and this motion should allow any
storm that is able to develop to move northward up over the
Siskiyous into Jackson and eastern Josephine Counties over to the
Cascades. There could also be a couple of isolated storms from Modoc
County up into Lake and northern Klamath County. It should be noted
that while we think coverage of storms won't be sufficient for a Red
Flag Warning, any lightning at all will bring with it the threat of
new fire starts. We'll continue to headline the Fire Weather
Planning Forecast.

By Sunday, we'll be on the western periphery of an upper high over
the Great Basin. A closed low out around 130W will open up and eject
northeastward offshore. Mid-level flow ahead of this system is
expected to increase to around 35-45 kt around 600 mb. This should
lead to some gusty winds due to strong diurnal mixing and downward
transport of momentum during the afternoon/evening. We have issued a
Fire Weather Watch for the increased winds along with low humidity
for the Shasta Valley to NW Modoc and some areas east of the
Cascades. See RFWMFR for the specific details. In addition, PWs
increase to 1.00 inch or greater as subtropical moisture works its
way northward. Moisture, instability and forcing will be greatest
along and east of the Cascades, so that is the area where isolated
thunderstorms are most likely, but a slight chance of storms exists
just about everywhere from I-5 eastward in Oregon and east of the
Red Salmon complex in NorCal. Latest data suggests a tick upward in
thunderstorm chances but also suggests lots of midlevel and high
cloud cover, which tends to limit the amount of lightning our area
sees. Given the sharp change in model output this evening and the
questions surrounding cloud cover, we are choosing to not issue a
Fire Weather Watch at this time, but we wanted to communicate this
change in the Fire Weather Discussion.

We'll remain in S-SW flow aloft through at least Tuesday, so the hot
weather looks to continue, albeit not quite as hot as over the
weekend. Isolated thunder chances continue in north Cascades and
over far eastern sections both Monday and Tuesday afternoons.
-Spilde/Keene

&&

.PREV DISCUSSION... /Issued 417 AM PDT Sat Aug 15 2020/

DISCUSSION...Satellite imagery is showing a relatively thin band
of cirrus clouds moving from south to north very slowly across
southern Oregon and northern California with clear skies
elsewhere. This has indicated our shift into deep southerly flow
(winds from the south) which will in turn, advance a much warmer
air mass into our area than yesterday. The forecast continues to
call for dangerously hot temperatures today, reaching up to 110
degrees in some parts of the west side valleys, including at
Medford and Happy Camp. The last time we've reached temperatures
this hot was 2017. Even Roseburg is forecast to reach 106 today
which as noted by the previous shift is 20 degrees above normal--
which is already the hottest part of the year, and should shatter
the previous daily record high temperature of 98 degrees set in
1933 and then tied in 2002 and 2012.

Temperatures on Sunday will be a few degrees cooler than Saturday,
but overall, expect the hot weather to continue through at least
Tuesday. Additionally, overnight low temperatures are forecast to
be rather warm. This will prevent significant relief from
occurring.

Here are some tips to help keep yourself and your loved ones safe
during this heat. Please check our website at weather.gov/medford
for more heat safety tips. A host of Excessive Heat Warnings and
Heat Advisories continue through Sunday evening, highlighting the
hottest period of this heatwave. Please see the NPWMFR for more
details.

* Check in on older adults, young children and those who are not
  feeling well.

* Take plenty of rest breaks in shade or air conditioning.

* Drink water before, during and after activities.

* Some area rivers are dangerously cold and have strong currents.
  Wear a life jacket if swimming.

For those who may decide to recreate today in the Mountains,
streams, or lakes; please be aware that the pattern will lead to
the possibility of thunderstorms today. The trigger looks really
weak, and guidance has backed off somewhat today, but still think
a storm or two could occur across Western Siskiyou County move up
through the Siskiyous into Jackson and eastern Josephine Counties
into the southern Oregon Cascades and portions of the East Side as
well as for Modoc County. Any storm could produce some gusty winds
and some occasional lightning. Have a plan to reach the safety of
a building or car as soon as you hear thunder.

* Have a plan and be on the look out for building thunderstorm
  clouds.

* You should make your way to your designated safe spot (a
  building, or a car) if you hear thunder.

* When thunder roars, go indoors.

The main threat for thunderstorms will occur on Sunday. Confidence
is increasing that something will happen as the convection
allowing models are split between two modes: scattered
thunderstorms and a more stratiform rain scenario. There are a few
nuances with this. If we start the day with a thick and
widespread cirrus shield, this could limit the thunderstorm
potential. However, even in this scenario, the hot temperatures
could create a leading edge of thunderstorms moving up from
central California ahead of the stratiform rain. The other
scenario, and at this point equally as probable is that this
system brings some elevated (and thus dry) storms to northern
California early Sunday morning (6 AM) and spread them into areas
west of the Cascades in southern Oregon before 10 AM. Then the
thunderstorm chances increase in the afternoon with more rainfall
associated with the storms. The problem with this is that the
steering flow is 30 knots, so these storms will be moving quickly,
limiting the wetting rain potential. Since confidence is
increasing that something is going to happen, have issued a fire
weather watch for much of the area for this threat. More
information will be available in the fire weather discussion below.

The forecast for Monday will continue to show isolated storms
inland from the coast range as well as another round of hot
temperatures. Tuesday will continue the hot temperature trend
(still not as hot as Saturday). Then, the flow shifts to be more
westerly (from the Pacific Ocean) moderating temperatures around
the area to be closer to normal for this time of year.
Precipitation chances also decrease in the latter half of next
week. -Schaaf

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...     Fire Weather Watch from Sunday morning through Sunday evening
     for ORZ624-625.
     Heat Advisory until 11 PM PDT Sunday for ORZ027>029.
     Excessive Heat Warning until 11 PM PDT Sunday for ORZ024-026.
     Heat Advisory until 11 PM PDT this evening for ORZ021-022.
     Excessive Heat Warning until 11 PM PDT Sunday for ORZ023-025.
     Fire Weather Watch from Sunday morning through Sunday evening
     for ORZ617-622-623.
     Fire Weather Watch from Sunday morning through Sunday evening
     for ORZ621.

CA...Heat Advisory until 11 PM PDT Sunday for CAZ082>084.
     Excessive Heat Warning until 11 PM PDT Sunday for CAZ080-081.
     Fire Weather Watch from Sunday morning through Sunday evening
     for CAZ285.
     Fire Weather Watch from Sunday morning through Sunday evening
     for CAZ280>282-284.

Pacific Coastal Waters...Small Craft Advisory until 11 AM PDT this morning for
     PZZ350-356-370-376.

BTL/BMS/BMS

The office that day

Everything else NWS Medford, OR issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 15, 11:49 AM PDTFire Weather WatchMFRModoc25 hr

Nearby

Red Flag Warnings in Oregon, 2020Red Flag Warnings in California, 2020Every red flag warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.