Cold Core Tornado Event on June 7, 2017

Overview

There were two different focus areas on Wednesday, June 7th, 2017. First, a cold front would exit into central Minnesota during the afternoon, spawning a few thunderstorms. Then, behind this front, an upper level disturbance would move into the Red River Valley during the late morning and early afternoon. The upper level disturbance proved to be the main weather producer for the day. Many factors came into play, helping to make this an ideal day for cold core tornadoes. Along with the upper level disturbance, there was abundant sunshine and good heating through the morning, which resulted in a frontal boundary and an area of surface low pressure setting up along the western edge of the Red River Valley. Between roughly noon and 2 pm, 8 tornado warnings and 1 severe thunderstorm warning were issued over the central and northern Red River Valley.

Tornado
Surface Maps
Satellite
Radar
Storm Reports
Rainfall
Environment
Watches & Warnings

Tornadoes:

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph

Surface Maps

These are the Weather Prediction Center's official surface maps for several hours on June 7th.

Satellite:

Here are loops of Water Vapor and Infrared Imagery.


Water Vapor	Infrared

Radar:

This is a radar loop that covers the event.

Radar Imagery

Storm Reports

This map shows the preliminary storm reports that were received June 7th, 2017.

Here are the actual reports.

Rain Reports

Here is a map of the rainfall amounts from yesterday. It may not capture all areas exactly, but does show the areas well.

Here are some of the rainfall reports we received.

Environment

Here are some of the various weather parameters at 1 pm on June 7th, as warnings began.


Water Vapor showing the spin	Temperatures	Winds


Fronts	Dew point	500mb Temperatures


NST (A tornado parameter)	Radar	Raw Water Vapor

The tornado watch and warnings issued


SPC Tornado Watch	NWS Grand Forks Warnings

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