Hang on to your candy, Halloween weather will be a total mess. The timing of this next potent system couldn’t get any worse for trick-or-treaters as heavy rain, strong winds and even snow threaten to make for an especially spooky Halloween night.

Weather statements are expanding ahead of a nasty Halloween storm that will take a big toll on much of Mississauga through until Friday.

The impact from this moisture packed system will begin to make its mark on Wednesday, with a widespread soaking rain picking up through the day on Thursday.

After being spoiled by temperatures more typical of mid-September to start the week, conditions are deteriorating — and quickly. This of course means that the timing of this storm will poorly align with any Halloween festivities on Thursday.

A moisture laden system over the lower Mississippi Valley will track north, with impact expected to last right through Friday. The frontal boundary of the storm will begin to bring rain showers to southern regions on Wednesday, ahead of a widespread soaking rain that spreads through much of Halloween.

SERIOUS SOAKER OF A SYSTEM, RISK OF LOCALIZED FLOODING

“The rain will be heavy at times with rumbles of thunder possible during Thursday afternoon and early evening as totals reach 30 to 60 mm across our region,” says Weather Network meteorologist Dr. Doug Gillham.

While a break from the rain is expected later Thursday evening, at this point it looks like the break will come after trick-or-treat times.

With the ground still moist from last weekend’s heavy flooding rain, this latest soggy blast could result in more localized flooding.

Lake levels are also much higher than normal for this time of year with strong winds and high waves threatening shoreline flooding in some local communities.

TAKE DOWN THE HALLOWEEN DECOR BEFORE FRIDAY’S BIG WINDS

As the rain and snow gradually taper through Friday, wind gusts between 60-90 km/h are possible as a strong cold front cuts through southern Ontario.

The strongest winds are expected late Thursday and into Friday with gusts possibly reaching as high as 100 km/h for the Niagara region and shoreline areas in eastern parts of the province including Prince Edward County by Friday afternoon


WEATHER HIGHLIGHTS

  • Classic fall storm takes aim for Halloween, soaking rain in the south and heavy snow in the north
  • Strong cold front with damaging wind gusts expected on Friday
  • Chilly weekend weather and bands of lake-effect snow north of the GTA into Sunday
  • Stay up-to-date on the ALERTS in your area