Alert archive / Montana / Mesoscale Discussions in 2018

Mesoscale Discussion 689

June 9, 20185 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 9, 2018, 7:11 PM MDT for 5 counties in Montana. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Jun 9, 2018, 7:11 PM MDT (01:11 UTC)
Expired
Jun 9, 2018, 8:45 PM MDT
In force
94 min
Issued by
the Storm Prediction Center

Counties Blaine County, MT, Chouteau County, MT, Fergus County, MT, Hill County, MT, Judith Basin County, MT

The radar

The Great Falls radar (KTFX), 109 km from the middle of the area, began a volume at 01:11 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

Great_falls, MT (KTFX), launched 00:00Z, 1.2 hours before the alert went out and 51 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 00:00Z on 2018-06-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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 00:00Z on 2018-06-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 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
2 J/kg
Mixed-layer CIN
-68 J/kg
Mixed-layer LCL
4511 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 9, 6:35 PM MDTMesoscale DiscussionSPCCarter, Custer, Fallon, Powder River, Prairie85 min
Jun 10, 1:15 PM MDTMesoscale DiscussionSPCCarter2 hr

Nearby

Mesoscale Discussions in Montana, 2018Every mesoscale discussion in 2018

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.