Alert archive / Idaho / Mesoscale Discussions in 2011

Mesoscale Discussion 1113

June 6, 201113 counties in Idaho; 11 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2011, 2:13 PM MDT for 13 counties in Idaho; 11 counties in Montana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 6, 2011, 2:13 PM MDT (20:13 UTC)
Expired: Jun 6, 2011, 4:15 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 24 counties

Ada County, ID, Blaine County, ID, Boise County, ID, Butte County, ID, Camas County, ID, Clark County, ID, Custer County, ID, Elmore County, ID, Gooding County, ID, Jefferson County, ID, Lemhi County, ID, Lincoln County, ID, Minidoka County, ID, Beaverhead County, MT, Broadwater County, MT, Deer Lodge County, MT, Gallatin County, MT, Jefferson County, MT, Madison County, MT, Meagher County, MT, Park County, MT, Silver Bow County, MT, Sweet Grass County, MT, Wheatland County, MT

The radar

The Pocatello radar (KSFX), 161 km from the middle of the area, began a volume at 20:14 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 8.2 hours before the alert went out and 287 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: 28 J/kg
Mixed-layer CIN: -493 J/kg
Mixed-layer LCL: 2009 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 195 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.

483 
ACUS11 KWNS 062014
SWOMCD
SPC MCD 062013
MTZ000-WYZ000-IDZ000-062215-

MESOSCALE DISCUSSION 1113
NWS STORM PREDICTION CENTER NORMAN OK
0313 PM CDT MON JUN 06 2011

AREAS AFFECTED...SWRN ID NEWD INTO SWRN MT

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 062013Z - 062215Z

ISOLATED STRONGER CELLS MAY BE CAPABLE OF PRODUCING LOCALLY GUSTY
WINDS AND/OR MARGINAL HAIL.

EARLY AFTERNOON HEATING BENEATH COOL MID-LEVEL TEMPERATURES HAS
RESULTED IN MODEST DESTABILIZATION ACROSS PARTS OF SRN ID...AHEAD OF
THE UPPER LOW ROTATING NEWD TOWARD THIS REGION.  ASCENT COMBINED
WITH THE DESTABILIZATION HAS RESULTED IN GENERALLY WEAK STORM
DEVELOPMENT...THOUGH A STRONGER/SUSTAINED CELL IS MOVING NEWD ACROSS
THE SNAKE RIVER VALLEY E OF BOI /BOISE ID/ ATTM.  THIS CELL IS ON
THE WRN FRINGE OF THE STRONGER FLOW ALOFT...AND AS THE STRONGER FLOW
SPREADS NEWD ACROSS THE HIGHER TERRAIN OF ERN ID WHERE LESSER
LOW-LEVEL MOISTURE/INSTABILITY IS EVIDENT...SEVERE THREAT SHOULD
REMAIN FAIRLY LIMITED/ISOLATED.  WHILE A COUPLE OF THE STRONGER
CELLS OVER THE NEXT FEW HOURS WILL BE CAPABLE OF LOCALLY
GUSTY/DAMAGING WINDS...WW WILL BECOME INCREASINGLY LIKELY WITH TIME
FARTHER NEWD TOWARD WRN AND CENTRAL MT...WHERE GREATER LOW-LEVEL
MOISTURE/INSTABILITY IS EVIDENT.

..GOSS.. 06/06/2011

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

ATTN...WFO...BYZ...RIW...TFX...PIH...MSO...BOI...

LAT...LON   42701466 43041596 43581636 46361332 46731129 46721110
            46750961 45740939 44471131 43031291 42731387 42701466

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 6, 4:13 PM MDT	Severe Thunderstorm Watch	SPC	Lemhi	6 hr
Jun 6, 4:45 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carbon, Fergus, Golden Valley, Judith Basin, Meagher and 9 more	2 hr
Jun 6, 5:46 PM MDT	Tornado Watch	SPC	Big Horn, Carbon, Fergus, Garfield, Golden Valley, Judith Basin and 9 more	7 hr

Nearby

Mesoscale Discussions in Idaho, 2011 Mesoscale Discussions in Montana, 2011 Every mesoscale discussion in 2011

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.