Regional Impacts:
Today
Central-western Labrador: Isolated thundershowers
Tonight
None
Saturday
Labrador/NB: Isolated to scattered thunderstorms
Convective Discussion:
A ridge of high pressure moves through the region today while the tail end of a trough of low pressure moves southeastward over Newfoundland today. Isolated showers with the slight risk of a thunderstorm is expected over central Labrador this afternoon. Convective temperatures near 25C are expected to be reached. With CAPE values of 500 J/kg but little moisture in the low levels and weak effective shear, the main threat would be some gusty winds. Some robust TCUs are expected over central to southeastern Newfoundland this afternoon but will be fighting a thermal ridge between 700 and 500 mb. Some locally heavy downpours are possible.
For Sunday, a trough of low pressure will slowly track eastward over Hudson Bay toward central Quebec. Ahead of the trough, an increasingly unstable air mass will aid in the formation of scattered showers and thunderstorms over western and central Labrador and into northern and western New Brunswick. Although there is an increase in precipitable water and CAPE, shear will remain weak so pulse type storms with locally heavy downpours and strong wind gusts are possible.
Thunderstorm outlook for today:
Thunderstorm outlook for tonight:
Thunderstorm outlook for Sunday:
