Unsettled Weather in the Western U.S.; Snow in the Upper Midwest

Coastal/low elevation rain and high elevation snow will extend from the Pacific Northwest into parts of California early this week. Moderate to heavy snow is expected from the Intermountain West into the central Rockies through Tuesday. Several inches of snow is expected over the Upper Peninsula of Michigan into northeast Minnesota through Tuesday. Read More >

Overview

For much of the day on Wednesday, July 12th, the atmosphere was quiet. Thick cloud cover, with areas of fog across the higher terrain of the Upper Peninsula of Michigan. Along the Wisonsin/Michigan stateline, clouds were able to erode quicker in the late afternoon hours. With the presence of a frontal boundary, the diminishing cloud cover allowed direct heating from the late afternoon sun. This resulted in considerable instability developing across Northern Wisconsin and sharply diminishing to the north of the stateline into Michigan. The result was a forecast challenge due to the sharp gradient that existed. Below is a look at storm damage photos, and a sample of some of the atmospheric elements forecasters utilized in the warning decision making process.

Photos
Radar
Environment/Meteorology
Other Links

Photos:

Storm Damage Photos


Shakey Lakes Campground - Brian Budds	Shakey Lakes Campground - Brian Budds	Shakey Lakes Campground - Brian Budds


Shakey Lakes Campground - Brian Budds	Shakey Lakes Campground - Brian Budds	Shakey Lakes Campground - Brian Budds

Radar:

MRMS Radar Summary

Radar Summary - MRMS (Multiple Radar Multi-System) 12July2017

GR Analyst:

Environment/Meteorology:

We are still working to add this section to the report. Please check back soon, as we will have additional forecast elements and explanation as to the environmental conditions that produced the severe storms Wednesday evening.


RAP SFC CAPE/CIN 12July2017 5PM CDT	RAP SFC CAPE/CIN 12July2017 6PM CDT	RAP SFC CAPE/CIN 12July2017 8PM CDT


HRRRx forecast radar reflectivity 12July2017	RAP forecast 0-1km Total Shear 12July2017

Unsettled Weather in the Western U.S.; Snow in the Upper Midwest

July 12th 2017: Severe Weather Event