Severe Weather Threat with Tornadoes Possible later today.

PASPC Convective Outlook :Severe Thunderstorms with a tornado or 2. Cannot be ruled out. 

Severe Thunderstorms and or Supercells around evening time in the Red River Valley

SOUTH-EASTERN MANITOBA WILL BE THE FOCUS FOR SEVERE THUNDERSTORM  DEVELOPMENT TODAY. AHEAD OF THE TROUGH, MODERATE SOUTHERLY WINDS OF  

30 TO 40 KM/H COMBINED WITH A CAPPING INVERSION WILL BUILD DEW POINTS  
INTO THE UPPER TEENS OR LOW 20S OVER THE REGION, WITH ADDITIONAL  
POOLING IN THE VICINITY OF THE TROUGH ITSELF. THE HUMID CONDITIONS  
COMBINED WITH MID-LEVEL LAPSE RATES NEAR 7C WILL COMBINE TO PRODUCE  
1500 TO 2000 J/KG OF MLCAPE. WIND PROFILES SHOW STRONG SPEED SHEAR  
WITH MODERATE LOW-LEVEL CURVATURE; BULK SHEAR VALUES WILL BE CLOSE TO  
50 KT WHILE SRH VALUES ARE FORECAST TO CLIMB ABOVE 200 M/S. ALL  
THIS WILL COMBINE TO PRODUCE A MODERATE SEVERE THUNDERSTORM THREAT  
OVER THE REGION.  
  
THUNDERSTORMS WILL LIKELY DEVELOP ALONG THE TROUGH LINE LATE THIS  
AFTERNOON (SOMETIME AFTER 22Z) WHILE IT LIES OVER THE SOUTHERN  
INTERLAKE INTO WESTERN MANITOBA. THE TROUGH WILL LIKELY SUPPORT  
SEVERAL DISCRETE SUPERCELLS THROUGH THE FIRST COUPLE HOURS OF ITS  
LIFESPAN, THEN FILL OUT INTO A MORE SOLID LINE OF THUNDERSTORMS AS  
THE TROUGH PUSHES INTO THE SOUTHEASTERN CORNER OF THE PROVINCE. THE  
PRIMARY THREAT FROM THESE THUNDERSTORMS WILL BE LARGE HAIL GIVEN THE  
HIGH CAPE VALUES AND FAVOURABLE SHEAR. ANY THUNDERSTORMS THAT ARE  
ABLE TO ORGANIZE A SUPERCELLULAR STRUCTURE WILL ALSO BE ABLE TO  
PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 90 KM/H. ADDITIONALLY, THE  
STRONG INFLOW, HIGH DEW POINTS AND RESULTANT LOW LCLS, AND LOW-LEVEL  
HODOGRAPH CURVATURE ALSO PRESENT A LOW TORNADO THREAT. SEVERE  
THUNDERSTORM WATCHES AND/OR TORNADO WATCHES WILL BE ISSUED LATER THIS  
AFTERNOON AS REQUIRED.  
  
THE GREATEST UNCERTAINTY WITH THIS SYSTEM IS HOW EXTENSIVE  
THUNDERSTORM DEVELOPMENT MAY BE; AT THE MOMENT THE IDEAS THAT THERE  
COULD BE JUST A FEW ISOLATED SUPERCELLS OR THAT IT COULD GROW INTO A  
SOLID LINE OF THUNDERSTORMS ARE EQUALLY BELIEVABLE AND FORECAST  
MODELS SHOW THAT, OFFERING A DIVERSE SELECTION OF OPTIONS. IT WILL  
LIKELY DEPEND ON SUBTLE BALANCES BETWEEN THE LOW-LEVEL INFLOW AND  
MID-LEVEL WINDS AND PRECISELY HOW MUCH THE LOW-LEVEL FLOW BACKS OR  
VEERS AHEAD OF THE TROUGH.  
  
THE THUNDERSTORMS WILL EXIT MANITOBA LATER THIS EVENING. MORE SETTLED  
CONDITIONS ARE EXPECTED ON FRIDAY.  

Information from Environment Canada. Didn't have time to create a post of my own. 

https://kamala.cod.edu/offs/CWWG/1907111900.focn45.html

  aytime heating, MLCAPE will reach 2000 to 3000 J/kg. The approach of a midlevel speed maximum will increase the bulk shear to 40-50 knots. As a result, supercells are expected during the mid to late afternoon, with the main threats being large hail andThe A low pressure system is forecast to move through central Manitoba, with a surface trough expected to extend to its southwest. South of this system and ahead of the trough, moisture will increase, peaking with dewpoints around 20 C. Coupled with daytime heating, MLCAPE will reach 2000 to 3000 J/kg. The approach of a midlevel speed maximum will increase the bulk shear to 40-50 knots. As a result, supercells are expected during the mid to late afternoon, with the main threats being large hail and damaging winds. The tornado risk will be minimal, as surface winds will be somewhat veered. As the evening wears on, storms are expected to congeal into a broken line and move off to the southeast, out of the region.