Convective Discussion
A couple of upper level disturbances are affecting Labrador today, while a trough continues to pull east of Newfoundland. Convection has been ongoing over eastern marine waters from the southern Grand Bank northeastward towards Funk Island Bank this morning and is expected to pull east of the marine waters this evening. With the aid of some coastal convergence and slight cooling aloft, southeastern Labrador could see some thundershowers this afternoon. Freezing levels are fairly low but there is still a decent amount of precipitable water so heavy downpours and small hail is possible.
A weak low pressure area currently south of James Bay will continue tracking to the southeast. A trough extending southeast of the low will bring some isolated showers to northern New Brunswick this evening and overnight. At this time the dynamics do not look favourable to initiate any surface based thundershowers as there is a considerable cap at 950mb based off the Caribou sounding to overcome.
Regional Impacts
Labrador…Lightning, locally heavy downpours and small hail are possible for southeastern Labrador.
Maritimes and Newfoundland…None
Roberta McArthur