Alert archive / Montana / Red Flag Warnings in 2017

Red Flag Warning 15, NWS Missoula, MT

September 11, 20177 counties in Montana

NWS Missoula, MT issued this red flag warning at Sep 11, 2017, 2:24 PM MDT for 7 counties in Montana. It took effect at Sep 12, 2017, 12:00 PM MDT. It was in force for 11 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 11, 2017, 2:24 PM MDT (20:24 UTC)
In effect from
Sep 12, 2017, 12:00 PM MDT
Expired
Sep 12, 2017, 10:51 PM MDT
In force
11 hr
Issued by
NWS Missoula, MT

Counties Flathead County, MT, Glacier County, MT, Lake County, MT, Lincoln County, MT, Missoula County, MT, Powell County, MT, Sanders County, MT

The radar

The Missoula radar (KMSX), 87 km from the middle of the area, began a volume at 20:21 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.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 8.4 hours before the alert went out and 174 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, Spokane, WA at 12:00Z on 2017-09-11Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 2017-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 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
1945 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
69 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

811 
WWUS85 KMSO 112024
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
224 PM MDT Mon Sep 11 2017

MTZ104-105-122030-
/O.NEW.KMSO.FW.W.0015.170912T1800Z-170913T0600Z/
/O.CON.KMSO.FW.W.0014.000000T0000Z-170912T0600Z/
Kootenai-Flathead/Glacier Park-
224 PM MDT Mon Sep 11 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT
TONIGHT...
...RED FLAG WARNING IN EFFECT FROM NOON TUESDAY TO MIDNIGHT MDT
TUESDAY NIGHT...

* Affected area: Fire Zone 104 (Kootenai). Fire Zone 105 
  (Flathead/Glacier Park). 

* Impacts: A dry airmass moving in today combined with the gusty
  winds will create critical fire conditions across midslopes and
  ridgetops this afternoon and evening...and again on Tuesday
  afternoon and evening. The strongest winds will mainly be north
  of the Highway 2 corridor. Winds and humidities will be slow to
  improve, thus critical fire conditions are expected well into
  the evening. 

* Winds: West-southwest 15 to 25 mph, gusting to 35 mph across 
  midslopes and ridgetops.

* Minimum Humidities: 10 to 20 percent.

&&

$$
5 follow-up statements
045 
WWUS85 KMSO 120558
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
1158 PM MDT Mon Sep 11 2017

MTZ104-105-130600-
/O.EXP.KMSO.FW.W.0014.000000T0000Z-170912T0600Z/
/O.CON.KMSO.FW.W.0015.170912T1800Z-170913T0600Z/
Kootenai-Flathead/Glacier Park-
1158 PM MDT Mon Sep 11 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TUESDAY TO
MIDNIGHT MDT TUESDAY NIGHT FOR GUSTY WINDS AND LOW HUMIDITY FOR 
FIRE WEATHER ZONES 104 AND 105... 

...RED FLAG WARNING WILL EXPIRE AT MIDNIGHT MDT TONIGHT FOR FIRE 
WEATHER ZONES 104 AND 105...


* Impacts: A dry airmass moving in today combined with the gusty 
  winds will create critical fire conditions across midslopes 
  and ridgetops this afternoon and evening...and again on 
  Tuesday afternoon and evening. The strongest winds will mainly 
  be north of the Highway 2 corridor. Winds and humidities will 
  be slow to improve, thus critical fire conditions are expected 
  well into the evening. 

* Winds: West-southwest 15 to 25 mph, gusting to 35 mph across 
  midslopes and ridgetops.

* Minimum Humidities: 10 to 20 percent.

&&


$$
209 
WWUS85 KMSO 120925
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
325 AM MDT Tue Sep 12 2017

MTZ104-105-130600-
/O.CON.KMSO.FW.W.0015.170912T1800Z-170913T0600Z/
Kootenai-Flathead/Glacier Park-
325 AM MDT Tue Sep 12 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO MIDNIGHT
MDT TONIGHT...

...RED FLAG WARNING WILL EXPIRE AT MIDNIGHT MDT TONIGHT FOR FIRE
WEATHER ZONES 104 AND 105...

* Impacts: Breezy westerly winds and low humidity will combine to
  create Red Flag conditions this afternoon and evening. Winds 
  and humidities will be slow to improve, thus critical fire 
  conditions are expected well into the evening. 

* Winds: West-southwest 15 to 25 mph, gusting to 35 mph mainly for 
  midslopes and ridgetops.

* Minimum Humidities: 10 to 20 percent.

&&

$$
976 
WWUS85 KMSO 120929 AAB 
RFWMSO

URGENT - FIRE WEATHER MESSAGE...UPDATED
National Weather Service Missoula MT
329 AM MDT Tue Sep 12 2017

MTZ104-105-130600-
/O.CON.KMSO.FW.W.0015.170912T1800Z-170913T0600Z/
Kootenai-Flathead/Glacier Park-
329 AM MDT Tue Sep 12 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO MIDNIGHT
MDT TONIGHT...

* Impacts: Breezy westerly winds and low humidity will combine 
  to create Red Flag conditions this afternoon and evening. 
  Winds and humidities will be slow to improve, thus critical 
  fire conditions are expected well into the evening. 

* Winds: West-southwest 15 to 25 mph, gusting to 35 mph mainly 
  for midslopes and ridgetops. 

* Minimum Humidities: 10 to 20 percent.

&&

$$
542 
WWUS85 KMSO 122002
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
202 PM MDT Tue Sep 12 2017

MTZ108>111-132015-
/O.NEW.KMSO.FW.W.0016.170913T2100Z-170914T0200Z/
East Lolo-Bitterroot-Deerlodge/West Beaverhead-East Beaverhead-
202 PM MDT Tue Sep 12 2017

...RED FLAG WARNING IN EFFECT FROM 3 PM TO 8 PM MDT WEDNESDAY for
Wind and Dry Conditions...

* Affected area:
   Fire Zone 108 (East Lolo).
   Fire Zone 109 (Bitterroot).
   Fire Zone 110 (Deerlodge/West Beaverhead).
   Fire Zone 111 (East Beaverhead).

* Impacts: A combination of stronger northwest winds and
  moderately low RH will create an extreme fire weather period
  from mid afternoon Wednesday through early evening across much
  of southwest Montana.  

* Winds: West to northwest winds will increase to 15 to 25 mph by
  mid afternoon and continue through the evening.

* Minimum humidities: RH will fall to 15 to 20 percent in the
  valleys and 20 to 25 percent in the terrain. The lowest RH will
  only persist into early evening with values increasing
  significantly through the remainder of the night. 

&&

$$

MTZ104-105-130600-
/O.CON.KMSO.FW.W.0015.000000T0000Z-170913T0600Z/
Kootenai-Flathead/Glacier Park-
202 PM MDT Tue Sep 12 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT
TONIGHT...

* Impacts: Breezy westerly winds and low humidity will combine 
  to create Red Flag conditions this afternoon and evening. 
  Winds and humidities will be slow to improve, thus critical 
  fire conditions are expected well into the evening. 

* Winds: West-southwest 15 to 25 mph, gusting to 35 mph mainly 
  for midslopes and ridgetops. 

* Minimum Humidities: 10 to 20 percent.

&&

$$
272 
WWUS85 KMSO 130451
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
1051 PM MDT Tue Sep 12 2017

MTZ104-105-130600-
/O.CAN.KMSO.FW.W.0015.000000T0000Z-170913T0600Z/
Kootenai-Flathead/Glacier Park-
1051 PM MDT Tue Sep 12 2017

...RED FLAG WARNING IS CANCELLED...

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

Humidities have improved and winds are gradually decreasing, thus
critical fire weather conditions are no longer expected. 

$$

MTZ108>111-140200-
/O.CON.KMSO.FW.W.0016.170913T2100Z-170914T0200Z/
East Lolo-Bitterroot-Deerlodge/West Beaverhead-East Beaverhead-
1051 PM MDT Tue Sep 12 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 3 PM TO 8 PM MDT
WEDNESDAY...

* Affected area: Fire Zone 108 (East Lolo). Fire Zone 109 
  (Bitterroot). Fire Zone 110 (Deerlodge/West Beaverhead). Fire 
  Zone 111 (East Beaverhead). 

* Impacts: A combination of stronger northwest winds and 
  moderately low RH will create an extreme fire weather period 
  from mid afternoon Wednesday through early evening across much 
  of southwest Montana. 

* Winds: West to northwest winds will increase to 15 to 25 mph 
  by mid afternoon and continue through the evening. 

* Minimum humidities: RH will fall to 15 to 20 percent in the 
  valleys and 20 to 25 percent in the terrain. The lowest RH 
  will only persist into early evening with values increasing 
  significantly through the remainder of the night. 

&&

$$

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 11, 2:53 AM MDTRed Flag WarningMSOFlathead, Glacier, Lake, Lincoln, Missoula, Powell and 1 more21 hr

Nearby

Red Flag Warnings in Montana, 2017Every red flag warning in 2017

Sources

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