Powerful Pacific System Impacting the West; First Significant Snow for Portions of the East

Power Pacific system will continue to bring significant impacts for Pacific Northwest into northern California the remainder of the week. Dangerous coastal affects, heavy rain, flooding, strong winds, and higher elevation mountain snow continues. Meanwhile, a storm across the east is set to bring the first accumulating snow to many higher elevations of the Catskills into the central Appalachians. Read More >

Overview

June ended with two stand-out storms that produced similar damage in similar locations. Hardest hit were those across portions of Dewey, Stanley, Hughes and Sully counties, affected by high winds and large hail that pulverized crops. Read about the events that occurred during the early morning of June 27th and the evening of June 29th below.

June 27th

During the late evening on June 26th, severe thunderstorms developed across portions of southwestern North Dakota and then tracked southeastward into across north central and central South Dakota during the early morning of June 27th. Large hail cut a swath of destruction to vegetation across portions of Sully and Stanley county, just north and east of Pierre, as was evident on satellite imagery in the days following. Additionally, 2-4+ inches of rain in a short period of time led to flooding and flash flooding in some cases north of Pierre and near/in Oacoma. Several county roads were reported to be partially or completely submerged.

June 29th

Severe thunderstorms developed across northeastern Wyoming during the afternoon hours, and a very favorable environment allowed activity to persist long distances eastward without losing much intensity. The most intense of these produced tornadoes across and near the northern Black Hills, 4.5" diameter hail near Newell, SD, and measured 90 mph straight-line winds near Sansarc, SD. This storm traveled a staggering 420 miles. During the days that followed, a large hail scar that meandered from western to central South Dakota was visible on satellite imagery; countless acres of crop and ranchland had been pulverized by the large hail.


June 27th Radar Loop	June 29th Radar Loop

Photos & Satellite, Etc.
Rainfall
Storm Reports

Photos & Satellite, Etc.:

Photos


Corn was chest high prior to the June 27th hailstorm east of Pierre.	Impacts of grapefruit sized hail and severe winds east of Newell, SD at 5:30 pm on June 29th. Courtesy of Kelsee Ellenbecker.	West of Pierre at 7:15 pm MDT on June 29th, courtesy of Derek Thompson	West of Pierre at 7:15 pm MDT on June 29th, courtesy of Derek Thompson

NWS instrumentation badly damaged from a COOP site in Onida, SD from the June 29th storm

Satellite, Etc.


MODIS Satellite imagery GIF of the hail scar produced on June 27th	MODIS Satellite Imagery of the hail scar produced on June 27th	Maximum Estimated Size Hail from the June 27th hailstorm

MODIS Satellite imagery of the hail scar produced on June 29th (and from the 27th), taken a few days after the event. Note	MODIS Satellite imagery of the hail scar produced on June 29th (and from the 27th), taken a week after the event	Maximum Estimated Size Hail from the June 29th hailstorm	More on the June 29th hailstorm