Alert archive / Montana / Mesoscale Discussions in 2005

Mesoscale Discussion 1113

June 1, 20058 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2005, 5:11 PM MDT for 8 counties in Montana. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Jun 1, 2005, 5:11 PM MDT (23:11 UTC)
Expired
Jun 1, 2005, 6:45 PM MDT
In force
94 min
Issued by
the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Wibaux County, MT

The radar

The Billings radar (KBLX), 231 km from the middle of the area, began a volume at 23:13 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

Rapid City, SD (KUNR), launched 12:00Z, 11.2 hours before the alert went out and 270 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, Rapid City, SD at 12:00Z on 2005-06-01Temperature 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, Rapid City, SD at 12:00Z on 2005-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 square meters per square second.19395878Sfc1 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
1775 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
112 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.

000 
ACUS11 KWNS 012311
SWOMCD
SPC MCD 012311 
MTZ000-WYZ000-020045-

MESOSCALE DISCUSSION 1113
NWS STORM PREDICTION CENTER NORMAN OK
0611 PM CDT WED JUN 01 2005

AREAS AFFECTED...SERN MT AND EXTREME NERN WY

CONCERNING...SEVERE THUNDERSTORM WATCH 373...

VALID 012311Z - 020045Z

LINE OF STRONG TSTMS...ALONG A POTENT WIND SHIFT...CONTINUES TO MOVE
NEWD AT 35 KTS ACROSS SERN MT AND NERN WY.  SATL SHOWS COOLING CLOUD
TOPS OVER POWDER RIVER COUNTY MT WHERE LINE SEEMS TO BE BOWING MORE
THAN THE REST OF THE LINE.  DOWNSTREAM AIR MASS REMAINS WEAKLY
UNSTABLE WITH SLIGHTLY MORE INSTABILITY NOTED FROM NWRN SD INTO SERN
MT.  THUS...TSTMS WILL LIKELY BE MAINTAINED AS THE STRONG FORCING
SPREADS NEWD AND A DAMAGING WIND THREAT WILL INCREASE DOWNSTREAM
THROUGH BROADUS AND TOWARD THE SD/ND BORDER THROUGH 0100Z.  

IN THE WAKE OF THE TSTM LINE SEGMENT...THE BOUNDARY LAYER HAS COOLED
AND STABILIZED VCNTY BIG HORN MTNS WWD.  THUS...THE SEVERE THREAT
HAS DIMINISHED.

..RACY.. 06/01/2005

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

ATTN...WFO...UNR...BYZ...GGW...RIW...

44280615 45130620 46590711 47670426 44710432

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 1, 12:07 PM MDTMesoscale DiscussionSPCPowder River113 min
Jun 1, 1:40 PM MDTSevere Thunderstorm WatchSPCBig Horn, Carter, Custer, Dawson, Fallon, Powder River and 4 more6 hr

Nearby

Mesoscale Discussions in Montana, 2005Every mesoscale discussion in 2005

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.