Alert archive / Montana / Mesoscale Discussions in 2012

Mesoscale Discussion 1065

June 4, 2012Clearwater County, Idaho County, Shoshone County, Idaho; 4 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2012, 9:08 PM PDT for Clearwater County, Idaho County, Shoshone County, Idaho; 4 counties in Montana. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jun 4, 2012, 9:08 PM PDT (04:08 UTC)
Expired: Jun 4, 2012, 10:15 PM PDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Clearwater County, ID, Idaho County, ID, Shoshone County, ID, Lake County, MT, Lincoln County, MT, Mineral County, MT, Sanders County, MT

The radar

The Missoula radar (KMSX), 101 km from the middle of the area, began a volume at 04:09 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 00:00Z, 4.1 hours before the alert went out and 106 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1397 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 211 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.

223 
ACUS11 KWNS 050408
SWOMCD
SPC MCD 050408 
MTZ000-IDZ000-050515-

MESOSCALE DISCUSSION 1065
NWS STORM PREDICTION CENTER NORMAN OK
1108 PM CDT MON JUN 04 2012

AREAS AFFECTED...NWRN MT...ID PANHANDLE

CONCERNING...SEVERE THUNDERSTORM WATCH 352...

VALID 050408Z - 050515Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 352
CONTINUES.

SUMMARY...AN INCREASINGLY ISOLATED SEVERE THREAT APPEARS TO BE
CONFINED TO PORTIONS OF THE ID PANHANDLE INTO NWRN MT WITHIN WW 352.
SERN PORTION OF WW MAY BE CANCELLED PRIOR TO 07Z WW EXPIRATION.

DISCUSSION...MORE INTENSE CONVECTIVE ACTIVITY HAS BECOME RELEGATED
TO THE ID PANHANDLE FROM IDAHO COUNTY NWD...WITH RECENT DEVELOPMENT
OCCURRING ALONG THE BITTERROOT MTNS. ALTHOUGH NOCTURNAL BOUNDARY
LAYER STABILIZATION WILL BE DETRIMENTAL TO THE AMPLITUDE OF THE
THREAT...VERY STRONG DEEP-LAYER SHEAR WILL SUPPORT MARGINALLY SEVERE
HAIL AND PERHAPS A LOCALIZED SEVERE GUST DURING THE NEXT FEW HOURS.
FARTHER SE...INTRUSION OF DRYING NOTED BY GOES PW VALUES INTO SWRN
MT/CNTRL ID AND CLOUD-FREE SKIES IN IR IMAGERY SUGGEST THAT THE
THREAT FOR ADDITIONAL DEVELOPMENT IS WANING.

..GRAMS.. 06/05/2012

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

ATTN...WFO...MSO...OTX...

LAT...LON   46371616 47321629 48571628 48811543 48721435 47861388
            46331419 45921481 45831517 45861580 46371616

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 4, 6:42 PM PDT	Mesoscale Discussion	SPC	Adams, Benewah, Boise, Bonner, Boundary, Clearwater and 9 more	93 min
Jun 5, 10:46 AM PDT	Mesoscale Discussion	SPC	Bear Lake	2 hr
Jun 5, 11:54 AM PDT	Mesoscale Discussion	SPC	Fremont, Teton	2 hr
Jun 4, 5:02 PM PDT	Tornado Watch	SPC	Blaine, Cascade, Chouteau, Fergus, Glacier, Hill and 6 more	7 hr
Jun 4, 7:22 PM PDT	Mesoscale Discussion	SPC	Blaine, Chouteau, Fergus, Hill, Petroleum, Phillips and 1 more	83 min
Jun 4, 9:48 PM PDT	Mesoscale Discussion	SPC	Liberty, Pondera, Teton, Toole	57 min
Jun 5, 12:37 PM PDT	Severe Thunderstorm Watch	SPC	Broadwater, Carbon, Gallatin, Golden Valley, Jefferson, Madison and 5 more	7 hr
Jun 5, 12:56 PM PDT	Mesoscale Discussion	SPC	Blaine, Cascade, Chouteau, Fergus, Glacier, Hill and 8 more	2 hr
Jun 5, 1:37 PM PDT	Tornado Watch	SPC	Blaine, Cascade, Chouteau, Fergus, Glacier, Hill and 6 more	8 hr
Jun 5, 3:21 PM PDT	Mesoscale Discussion	SPC	Broadwater, Golden Valley, Meagher, Stillwater, Sweet Grass, Wheatland	84 min
Jun 5, 3:48 PM PDT	Mesoscale Discussion	SPC	Cascade, Chouteau, Fergus, Glacier, Golden Valley, Judith Basin and 6 more	87 min

Nearby

Mesoscale Discussions in Montana, 2012 Mesoscale Discussions in Idaho, 2012 Every 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.