Alert archive / Minnesota / Mesoscale Discussions in 2017

Mesoscale Discussion 1512

August 16, 20178 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Aug 16, 2017, 9:00 PM CDT for 8 counties in Minnesota. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Aug 16, 2017, 9:00 PM CDT (02:00 UTC)
Expired
Aug 16, 2017, 10:30 PM CDT
In force
90 min
Issued by
the Storm Prediction Center

Counties Carver County, MN, Hennepin County, MN, Kandiyohi County, MN, McLeod County, MN, Meeker County, MN, Renville County, MN, Scott County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 53 km from the middle of the area, began a volume at 02:04 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

Minneapolis, MN (KMPX), launched 00:00Z, 2.0 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, Minneapolis, MN at 00:00Z on 2017-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 445 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, Minneapolis, MN at 00:00Z on 2017-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 217 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
445 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
756 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
217 m²/s²
0-3 km storm-relative helicity
238 m²/s²
Significant tornado parameter
0.6
Supercell composite
3.6

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
Aug 16, 7:00 PM CDTTornado WatchSPCCarver, Kandiyohi, Le Sueur, McLeod, Meeker, Renville and 3 more3 hr

Nearby

Mesoscale Discussions in Minnesota, 2017Every mesoscale discussion in 2017

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.