Alert archive / Montana / Red Flag Warnings in 2012

Red Flag Warning 6, NWS Great Falls, MT

March 31, 20125 counties in Montana

NWS Great Falls, MT issued this red flag warning at Mar 31, 2012, 4:22 AM MDT for 5 counties in Montana. It took effect at Mar 31, 2012, 12:00 PM MDT. It was in force for 3 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
Mar 31, 2012, 4:22 AM MDT (10:22 UTC)
In effect from
Mar 31, 2012, 12:00 PM MDT
Expired
Mar 31, 2012, 2:51 PM MDT
In force
3 hr
Issued by
NWS Great Falls, MT

Counties Blaine County, MT, Chouteau County, MT, Fergus County, MT, Hill County, MT, Phillips County, MT

The radar

The Great Falls radar (KTFX), 169 km from the middle of the area, began a volume at 10:23 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

Great_falls, MT (KTFX), launched 00:00Z, 10.4 hours before the alert went out and 118 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, Great_falls, MT at 00:00Z on 2012-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 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, Great_falls, MT at 00:00Z on 2012-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.1939587897117136Sfc1 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
2 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
2428 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
247 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

595 
WWUS85 KTFX 311022
RFWTFX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE GREAT FALLS MT
422 AM MDT SAT MAR 31 2012

MTZ113-115-312200-
/O.NEW.KTFX.FW.W.0006.120331T1800Z-120401T0300Z/
HILL AND BLAINE COUNTIES-CHOUTEAU AND FERGUS COUNTIES-
422 AM MDT SAT MAR 31 2012

...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS
EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE
WEATHER ZONES 113 AND 115 FOR ELEVATIONS BELOW 6000 FEET...

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A RED FLAG
WARNING FOR GUSTY WINDS...LOW RELATIVE HUMIDITY AND A FRONTAL
PASSAGE WITH ISOLATED THUNDERSTORMS...WHICH IS IN EFFECT FROM
NOON TODAY TO 9 PM MDT THIS EVENING.

* AFFECTED AREA...FIRE WEATHER ZONES 113 AND 115...FOR ELEVATIONS
  BELOW 6000 FEET.

* WINDS...SOUTHWEST WINDS 15 TO 25 MPH...WITH GUSTS UP TO 35 MPH.

* RELATIVE HUMIDITY...AS LOW AS 18 PERCENT.

* IMPACTS...EXPECT LOW RELATIVE HUMIDITIES FOR SEVERAL HOURS THIS
  AFTERNOON/EARLY THIS EVENING...ALONG WITH BREEZY SOUTHWEST
  WINDS. ADDITIONALLY...ISOLATED THUNDERSTORMS ARE POSSIBLE EARLY
  THIS EVENING AS A COOL FRONT MOVES THROUGH. SOME THUNDERSTORMS
  WILL PRODUCE STRONG GUSTY ERRATIC WIND GUSTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE ADVISE THE APPROPRIATE OFFICIALS OR FIRE CREWS IN THESE
AREAS OF THIS RED FLAG WARNING.

&&

$$

HTTP://WEATHER.GOV/GREATFALLS
1 follow-up statement
575 
WWUS85 KTFX 312051
RFWTFX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE GREAT FALLS MT
251 PM MDT SAT MAR 31 2012

MTZ113-115-312200-
/O.CAN.KTFX.FW.W.0006.000000T0000Z-120401T0300Z/
HILL AND BLAINE COUNTIES-CHOUTEAU AND FERGUS COUNTIES-
251 PM MDT SAT MAR 31 2012

...RED FLAG WARNING IS CANCELLED FOR FIRE WEATHER ZONES 113 AND
115...

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS CANCELLED THE RED
FLAG WARNING. 

RELATIVE HUMIDITY WILL NOT FALL AS LOW AS PREVIOUSLY ANTICIPATED
WITH MINIMUM VALUES THROUGH THE REMAINDER OF THIS AFTERNOON AROUND
25 TO 30 PERCENT. SOUTHWEST WINDS WILL REMAIN BREEZY AT 10 TO 20 MPH
WITH GUSTS TO 30 MPH. DUE TO THE SLIGHTLY HIGHER HUMIDITY AND
LESSER WINDS...WIDESPREAD CRITICAL FIRE WEATHER CONDITIONS ARE NO LONGER
EXPECTED. IN ADDITION...SCATTERED SHOWERS HAVE DEVELOPED ACROSS
CENTRAL MONTANA AND WILL MOVE NORTHEAST INTO NORTH CENTRAL MONTANA
THIS EVENING AND AN ISOLATED THUNDERSTORM MAY ALSO DEVELOP LATER
THIS AFTERNOON AND EVENING. 

$$

HTTP://WEATHER.GOV/GREATFALLS

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 30, 9:10 PM MDTWinter Storm WarningTFX35 hr
Mar 30, 9:16 PM MDTHigh Wind WarningTFX6 hr

Nearby

Red Flag Warnings in Montana, 2012Every red flag warning in 2012

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.