Monday, July 10, 2017

Two tornadoes in southern Minnesota Sunday evening (EF-1 and EF-0 rating) Numerous reports of large hail up to grapefruit size! Severe weather returns Tue night especially for western, central and southern MN. Strong lake wind with cool temps in the Twin Ports Tue night-Wed

/Issued 5:11 PM CDT, Monday, July 10, 2017/

Source:  http://kamala.cod.edu/SPC/

Thunderstorms are possible across parts of the Northland Tuesday or Tuesday night, a few of these storms could become strong to severe especially over western-southern sections of the Northland.  Damaging wind gusts and large hail are the main threats if storms become severe.













Source:  http://www.wpc.ncep.noaa.gov















Source:  https://www.weatherbell.com/

Kind of an unusual setup for midweek (Considering the time of year) Strong high pressure to our north while low pressure passes by to our south, the gradient between the high and low will tighten up which will cause a strong east/northeast wind over western Lake Superior and in the Twin Ports beginning Tuesday evening, lasting through Wednesday...Wind gusts of 20-30 mph or greater will be possible in the Twin Ports during that aforementioned time period.
















Source:  http://weather.cod.edu

I guess today's theme is all about satellite images - Plenty of those in today's blog, enjoy!

Visible satellite loop from this morning, July 10, 2017 -- Watch the low clouds/fog burn off near Lake Superior which was replaced by a band of cumulus clouds which popped up in northeast Minnesota late this morning.
















Source:  http://weather.cod.edu/satrad/exper/

Here's a one minute and 30 second visible satellite loop from Sunday evening showing the explosion of supercell thunderstorms over central and southern Minnesota.












Source:  http://weather.cod.edu

Visible satellite image from just before sunset Sunday evening -- Cloud tops 50,000-65,000 feet associated with the severe thunderstorms across the south half of Minnesota last evening, very impressive!

















Source:  http://weather.cod.edu

Another visible satellite image from late Sunday afternoon, this time a plume of smoke showing up nicely as it emanated from fires in western Canada while the NW winds aloft carried this smoke plume southeast into the northern Plains into portions of Minnesota.
















A few of the more significant severe weather reports from Sunday evening, July 9, 2017
Source:  http://www.spc.noaa.gov

*8:21 PM CDT:  HAIL.  2.00 inch.  Onamia, MN (Mille Lacs County)  Hen Egg size hail.

*8:45 PM CDT:  HAIL.  2.00 inch.  Appleton, MN (Swift County)  Hen Egg size hail.

*8:55 PM CDT:  HAIL.  2.50 inch.  Gibbon, MN (Sibley County)  Tennis ball size hail.

*8:55 PM CDT:  HAIL.  2.75 inch.  Winthrop, MN (Sibley County)  Baseball size hail.

*9:02 PM CDT:  HAIL.  4.00 inch.  Winthrop, MN 2 SW (Sibley County)  Grapefruit size hail.

*9:10 PM CDT:  HAIL.  2.75 inch.  Lafayette, MN (Sibley County)  Baseball size hail.

*9:11 PM CDT:  HAIL.  2.00 inch.  Watson, MN 1 SW (Chippewa County)  Hen Egg size hail.

*9:13 PM CDT:  HAIL.  2.50 inch.  Winthrop, MN (Sibley County)  Tennis ball size hail.

*9:15 PM CDT:  HAIL.  2.75 inch.  Lafayette, MN (Sibley County)  Baseball size hail.

*9:15 PM CDT:  HAIL.  4.00 inch.  Layfayette, MN (Sibley County)  Grapefruit size hail.

Note:  There were also numerous reports of large hail ranging in size from quarters to golf balls (1.00 inch to 1.75 inch diameter)

Preliminary tornado information from Sunday, July 9, 2017
Source:  http://www.weather.gov/mpx/

Tornado #1 - Near Courtland, Minnesota (Nicollet County)

Time:  9:37 PM CDT - 9:41 PM CDT
EF rating:  EF-0
Estimated Peak Winds:  70-75 mph
Path Length:  1.3 miles
Max Width:  50 yards
Injuries/Deaths:  0 fatalities, 0 injuries

Summary:  This tornado occurred just west of Swan Lake about 3 miles north of Courtland in Nicollet County.

Tornado #2 - North of Lake Crystal, Minnesota (Blue Earth County)

Time:  10:30 PM CDT - 10:38 PM CDT
EF Rating:  EF-1
Estimated Peak Winds:  90-95 mph
Path Length:  2.7 miles
Max Width:  100 yards
Injuries/Deaths:  0 fatalities, 0 injuries

Summary:  This tornado touched down approximately 4 miles north of Lake Crystal in Blue Earth County.

Weather Synopsis

A nice summer afternoon across the Northland with highs in the mid 70s to low 80s.  Some cumulus clouds and areas of cirrus clouds over parts of the area this afternoon but overall skies were mostly sunny today after the fog/low clouds burned off.

A quiet weather night ahead under clear to partly cloudy skies.  Lows will range from the 40s in the typical cold spots to the mid 50s and low 60s elsewhere.

High pressure which gives us the tranquil night tonight will move off to the east Tuesday which allows an area of low pressure to approach from the west, a warm front will also move east reaching western Minnesota Tuesday evening while a cold front drops south out of Ontario Province while it becomes nearly stationary over the northern half of Minnesota and Wisconsin through Tuesday night.
Occasional showers and some thunderstorms are likely over the Northland Tuesday and Tuesday night with locally heavy rainfall possible.

There is also a risk of a few strong to severe thunderstorms especially over the Brainerd Lakes area of east central Minnesota.  Most of our area will be void of any surface based instability but elevated CAPE is forecast to build to 500-1500 j/kg by Tuesday night.  Much higher values of instability will be found over western-southern Minnesota Tuesday and this is where the greater potential for severe weather will be the way it looks now.

Low pressure and cold front exits to our south/east Wednesday as high pressure sets up across central Canada.  Gusty and cool NE winds will occur Wednesday and Thursday near Lake Superior with highs only in the 50s Wednesday, and in the 60s Thursday.  Farther inland expect highs Wednesday and Thursday to be in the 60s and 70s.  Lingering showers are possible in parts of the area Wednesday with some fog and drizzle near Lake Superior.  Thursday looks mainly dry.

Warmer temperatures are forecast to return later this week into the weekend with highs in the 70s and 80s Friday, Saturday and Sunday...Also looks more humid especially Saturday and possibly on Sunday with dew points of 60 to around 70 degrees.

Forecast for Duluth and Superior

.Tonight...  Mostly clear.  Low 55 to 60.  Wind variable around 10 mph.

.Tuesday...  Partly to mostly cloudy.  A few showers possible.  High 75 to 80 but turning cooler later in the day.  Wind south to southeast at 10 to 20 mph becoming east later in the day.

.Tuesday night...  Windy.  Mostly cloudy with occasional showers.  Isolated thunderstorms also possible.  Fog and drizzle.  Lows in the 50s.  Wind east at 15 to 30 mph.

.Wednesday...  Windy.  Mostly cloudy.  Drizzle and fog possible.  Highs in the 50s.  Wind east at 15 to 30 mph.

Normal temperatures for Tuesday

High:  76
Low:   55

Sunrise Tuesday:  5:26 AM CDT
Sunset Tuesday:   9:01 PM CDT

Tim