Tornadic supercells expected in Alberta today


Alberta

  • Area(s): Central regions.

  • Timing: Wednesday afternoon and evening.

  • Threats: 4-5cm hail and winds gusts to 110 km/h with risk of a tornado.

A developing low pressure system will bring severe weather to central Alberta today. There is a chance to see hail up to 5cm and strong wind gusts up to 110 km/h from Nordegg northeastwards to Cold Lake. There is also the risk of tornadic storms developing east of the City of Edmonton to the Saskatchewan border. South east sections will see storms capable of producing 2-3cm hail and wind gusts up to 100km/h.


Saskatchewan

  • Area(s): Western

  • Timing: Wednesday afternoon and evening

  • Threats: Severe thunderstorms.

Thunderstorms will likely move into western Saskatchewan on this afternoon. Some of these thunderstorms will offer a threat for hail up to 3 cm in diameter and straight-line winds to 100 km/h.

SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM PREDICTION CENTRE OF ENVIRONMENT CANADA AT 7:00 AM CDT WEDNESDAY JULY 10 2019. WESTERN PRAIRIES...AN ACTIVE CONVECTIVE DAY IS EXPECTED FOR CENTRAL ALBERTA TODAY AND MOVING INTO WEST CENTRAL SASKATCHEWAN THIS EVENING. A LOW PRESSURE CENTER DEVELOPING OVER CENTRAL ALBERTA WILL HELP TO ORGANIZE SOME POTENTIALLY SEVERE CONVECTION THIS AFTERNOON AND EVENING. THE LOW WILL HELP TO POOL MOISTURE OVER EAST CENTRAL REGIONS OF THE PROVINCE THAT WILL THEN DESTABILIZE THIS AFTERNOON AS THE CAP WEAKENS THUS ACTIVATING THE UP TO 2000 J/KG CAPE. FURTHERMORE SOUTHWESTERLY JETS ALOFT WILL PROVIDE SUFFICIENT SHEAR TO POTENTIAL STORMS WITH 40-50 KTS OF 0-6KM BWD AVAILABLE. THESE CONDITIONS WILL PROVIDE A FAVOURABLE ENVIRONMENT FOR THE DEVELOPMENT LONG LIVED STORMS INCLUDING SUPERCELLS. GIVEN THE HIGH MOISTURE AND RELATIVELY LOW FREEZING LEVELS NEAR 2700 METRES LARGE HAIL UP TO 5CM IS POSSIBLE. ALSO STORM RELATIVE HELICITIES IN EASTERN ALBERTA AND WESTERN SASKATCHEWAN COMBINED THE LOW LCLS WILL PROVIDE AN ATMOSPHERE CONDUCIVE TO POTENTIAL TORNADIC DEVELOPMENT THIS AFTERNOON.

FURTHER SOUTH THUNDERSTORMS ARE ALSO POSSIBLE FROM CALGARY NORTH AND EAST THOUGH THESE STORMS WILL BE HIGHER BASED AND POTENTIAL THREATS EXPECTED ARE HAIL UP TO 3 CM AND STRONG WIND GUSTS UP TO 110 KM/H.