Today’s Forecast: Storm Clouds Gathering Over the Bay
THUNDER BAY – WEATHER – Good morning, Thunder Bay! As of 6:00 AM EDT at Thunder Bay Airport, the city is cloaked under cloudy skies with a cool 5.9°C. The dew point is a damp 2.7°C, and humidity sits at a fairly muggy 80%. Winds are light, coming in from the east at 6 km/h, and visibility is excellent at 24 km.
The barometric pressure reads 101.4 kPa and is falling, signaling that the calm won’t last long.
A Rainfall Warning is in effect for Thunder Bay today as a low-pressure system barrels into the region. This morning brings a 30% chance of showers, but the main event begins around noon when rain, at times heavy, is set to move in.
Expect rainfall amounts between 10 and 20 mm today, along with a risk of thunderstorms by this afternoon. With the ground still partially frozen, there’s a heightened risk of localized flooding, especially in low-lying areas.
The high today will reach 10°C, making for a damp but mild afternoon. The UV index is at 4 — moderate enough to warrant some sunscreen if you sneak outside between the raindrops.
Historically, April 28th in Thunder Bay has swung both ways: a record high of 23.5°C and a record low of -9.3°C. Today finds us sitting (and soon splashing) right in the middle.
Tonight: Heavy Rain, Thunderstorms, and a Sudden Chill
Tonight, the rain continues — at times heavy — with an additional 15 to 25 mm expected. Thunderstorms are still a possibility early in the evening. Winds will shift to the northwest at 20 km/h by this evening, then crank up to a north wind at 40 km/h gusting to 60 after midnight. Temperatures will dip down to 0°C, setting the stage for an icy surprise.
Tuesday and Wednesday: Ice, Snow, and Sun
Tuesday, April 29th, will start off with snow or ice pellets early in the morning, ending by mid-morning. There’s a risk of freezing rain early on, so watch for slick sidewalks and roads during your commute. After the wintry mix moves out, skies will clear beautifully. Winds will remain from the north at 30 km/h gusting to 50 early, but will calm down by noon. The high will climb to 7°C, and the UV index will bounce back up to a strong 6.
Tuesday night will be clear but cold, with the mercury dropping to -6°C — a frosty reminder that spring’s grip is still a bit slippery.
Wednesday, April 30th, promises full-on sunny skies and a pleasant high of 11°C. Clouds could creep in overnight with a 30% chance of showers and a milder low of +2°C.
What to Wear?
Today: waterproof jackets, rain boots, and don’t leave the house without an umbrella. Tonight and Tuesday morning: bundle up for icy sidewalks and blustery winds — hats, mitts, and winter jackets are back in style. By Wednesday, light spring gear will be just right.
Thunder Bay Weather Trivia
Did you know? Thunder Bay boasts one of Canada’s highest annual sunshine totals — over 2,200 hours a year! Today’s rain is just paying its dues for all that summer sunshine on the horizon.
