Alert archive / Montana / Mesoscale Discussions in 2012

Mesoscale Discussion 1079

June 5, 2012Hill County, Judith Basin County, Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2012, 6:07 PM MDT for Hill County, Judith Basin County, Montana. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Jun 5, 2012, 6:07 PM MDT (00:07 UTC)
Expired
Jun 5, 2012, 7:00 PM MDT
In force
53 min
Issued by
the Storm Prediction Center

Counties Hill County, MT, Judith Basin County, MT

The radar

The Great Falls radar (KTFX), 114 km from the middle of the area, began a volume at 00:10 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.1 hours before the alert went out and 252 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, Glasgow Intl Airport, MT at 00:00Z on 2012-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 880 joules per kilogram.LCLLFCEL10008507005003002001001 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, Glasgow Intl Airport, MT at 00:00Z on 2012-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 244 square meters per square second.193958Sfc1 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
880 J/kg
Mixed-layer CIN
-226 J/kg
Mixed-layer LCL
2578 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
244 m²/s²
0-3 km storm-relative helicity
359 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

313 
ACUS11 KWNS 060007
SWOMCD
SPC MCD 060007 
MTZ000-060100-

MESOSCALE DISCUSSION 1079
NWS STORM PREDICTION CENTER NORMAN OK
0707 PM CDT TUE JUN 05 2012

AREAS AFFECTED...N-CNTRL MT

CONCERNING...TORNADO WATCH 360...

VALID 060007Z - 060100Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 360 CONTINUES.

SUMMARY...INTENSE/POTENTIALLY LONG-TRACKED SUPERCELL AROUND 20 W LWT
SHOULD REMAIN CAPABLE OF PRODUCING TORNADOES...VERY LARGE HAIL AND
DAMAGING WINDS.

DISCUSSION...SUPERCELL WITH IMPRESSIVELY STRONG MESOCYCLONIC
ROTATION HAS PROGRESSED NWD ACROSS ERN JUDITH BASIN INTO WRN FERGUS
COUNTY IN THE PAST HOUR. BUNKERS MOTION FOR RIGHT-MOVING SUPERCELL
WILL CONTINUE TO FAVOR A NWD TRAJECTORY...INTO A HIGHLY FAVORABLE
THERMODYNAMIC/KINEMATIC PROFILE FOR SUPERCELL SUSTENANCE. PRESENCE
OF MIDDLE TO UPPER 50S SURFACE DEW POINTS IS LIKELY YIELDING MLCAPE
OF 1500-2000 J/KG PER OLDER GENERATION RUC OBJECTIVE ANALYSIS. LARGE
CYCLONIC HODOGRAPHS SAMPLED IN THE GGW VWP DATA WILL REMAIN QUITE
CONDUCIVE FOR PERSISTENT/STRONG MESOCYCLONES.

..GRAMS.. 06/06/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...TFX...

LAT...LON   47311048 48211037 48621018 48780967 48600922 48130927
            47310942 46910961 46850990 46921040 47311048

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 5, 7:39 PM MDTMesoscale DiscussionSPCBroadwater66 min
Jun 5, 8:08 PM MDTMesoscale DiscussionSPCBlaine, Cascade, Chouteau, Hill, Liberty, Pondera and 2 more67 min
Jun 5, 9:49 PM MDTMesoscale DiscussionSPCChouteau, Liberty, Toole56 min

Nearby

Mesoscale Discussions in Montana, 2012Every mesoscale discussion 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.