Alert archive / Montana / Mesoscale Discussions in 2003

Mesoscale Discussion 1417

June 19, 200312 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2003, 5:46 PM MDT for 12 counties in Montana. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Jun 19, 2003, 5:46 PM MDT (23:46 UTC)
Expired
Jun 19, 2003, 6:45 PM MDT
In force
59 min
Issued by
the Storm Prediction Center

Counties Cascade County, MT, Chouteau County, MT, Fergus County, MT, Hill County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Liberty County, MT, Meagher County, MT, Petroleum County, MT, Pondera County, MT, Teton County, MT, Toole County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 11.8 hours before the alert went out and 54 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 12:00Z on 2003-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Great_falls, MT at 12:00Z on 2003-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -115 square meters per square second.1939Sfc1 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
1981 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-115 m²/s²
0-3 km storm-relative helicity
-11 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 18, 7:17 PM MDTMesoscale DiscussionSPCFlathead, Glacier, Lake, Lewis and Clark, Lincoln, Mineral and 4 more88 min
Jun 19, 12:32 PM MDTMesoscale DiscussionSPCBeaverhead, Cascade, Deer Lodge, Flathead, Granite, Jefferson and 10 more118 min
Jun 19, 1:05 PM MDTSevere Thunderstorm WatchSPCBeaverhead, Broadwater, Deer Lodge, Gallatin, Granite, Jefferson and 9 more6 hr
Jun 19, 3:56 PM MDTMesoscale DiscussionSPCBeaverhead, Broadwater, Carbon, Cascade, Deer Lodge, Fergus and 21 more94 min

Nearby

Mesoscale Discussions in Montana, 2003Every mesoscale discussion in 2003

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.