Frost — Sorel - Yamaska area
Right now
The most recent data we hold from Environment and Climate Change Canada arrived 9 hours ago.
Nothing else has been detected within 20 km in the last 24 hours.
This page covers the record dated 21 October 2026. Browse recent observations in this area:
Official warning
The issuing authority declared this warning over on 21 October 2026 at 09:26 UTC. Its original text remains below.
Highest level recorded: Moderate.
Level in this notice: Moderate.
Environment Canada
yellow advisory - frost - in effect
Temperatures will drop to near or below the freezing mark overnight tonight.
###
Damage to plants, trees, and crops is possible.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to QCstorm@ec.gc.ca or post reports on social media using #QCStorm.
Closing notice from the authority
yellow advisory - frost - ended
Widespread frost is no longer expected.
###
This alert expired on 21 October 2026 at 09:26 UTC. It is kept here as a record.
It is one of only 4 we have recorded within 20 km of this point since 9 October 2026. The last comparable one was on 18 October 2026. 3 more were recorded here in the fortnight before it.
What the source measured
Environment and Climate Change Canada reported: Temperatures will drop to near or below the freezing mark overnight tonight. ### Damage to plants, trees, and crops is possible. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to QCstorm@ec.gc.ca or post reports on social media using #QCStorm.
Urban PEI: 421,658 within a heuristic 50 km radius; not unique people.
Nearby, since 9 October 2026
- October 18, 2026 · score 37 · 0.0 km
- October 13, 2026 · score 37 · 0.0 km
- October 9, 2026 · score 37 · 0.0 km
How we know
One source: Environment and Climate Change Canada. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Event data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Legacy data-support index | 0.68/1 |
| Coordinates | 45.9561, -73.0592 |
| Nearest city | Sorel-Tracy (10 km) |
| Urban exposure index (PEI) | 421.7K within 50 km |
| Impact tier | significant |
| Timestamp | 2026-10-21T04:00:00.000Z |
| Source | https://dd.weather.gc.ca/today/alerts/cap/20261021/CWUL/03/T_WOCN10_C_CWUL_202610210302_3142571480.cap |
| Licence | ECCC Data Services End-use Licence 2.1.1 · Environment and Climate Change Canada · Grouped by area and warning; CAP severity mapped; map location derived from alert geometry. Original warning text preserved. |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: cap_ca_eccc. Occurrence: 2026-10-21T04:00:00.000Z.
First archived: 2026-10-19T20:30:42.040Z. Material modification: 2026-10-21T03:39:08.236Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score breakdown
Technical details
| Event | frost |
| AreaDesc | Sorel - Yamaska area |
| Geocodes | [{"name":"layer:EC-MSC-SMC:1.0:CLC","value":"037110"},{"name":"profile:CAP-CP:Location:0.3","value":"2449113"},{"name":"profile:CAP-CP:Location:0.3","value":"2453005"},{"name":"profile:CAP-CP:Location:0.3","value":"2453010"},{"name":"profile:CAP-CP:Location:0.3","value":"2453015"},{"name":"profile:CAP-CP:Location:0.3","value":"2453020"},{"name":"profile:CAP-CP:Location:0.3","value":"2453025"},{"name":"profile:CAP-CP:Location:0.3","value":"2453032"},{"name":"profile:CAP-CP:Location:0.3","value":"2453040"},{"name":"profile:CAP-CP:Location:0.3","value":"2453050"},{"name":"profile:CAP-CP:Location:0.3","value":"2453052"},{"name":"profile:CAP-CP:Location:0.3","value":"2453065"},{"name":"profile:CAP-CP:Location:0.3","value":"2453072"},{"name":"profile:CAP-CP:Location:0.3","value":"2454115"},{"name":"profile:CAP-CP:Location:0.3","value":"2454120"},{"name":"profile:CAP-CP:Location:0.3","value":"2454125"},{"name":"profile:CAP-CP:Location:0.3","value":"2457075"},{"name":"profile:CAP-CP:Location:0.3","value":"2459035"}] |
| Onset | 2026-10-21T04:00:00-00:00 |
| Effective | 2026-10-21T03:08:50-00:00 |
| Expires | 2026-10-21T09:26:53-00:00 |
| TimeBasis | onset |
| LocalDay | 20261021 |
| WarningGeometry | {"polygons":[[[[-73.2205,45.8332],[-73.377,45.8363],[-73.3097,45.8917],[-73.2243,45.9878],[-73.2215,45.991],[-73.2065,46.0739],[-73.1623,46.1349],[-73.0559,46.1786],[-73.0479,46.1579],[-73.0173,46.1186],[-72.9808,46.0734],[-72.9555,46.0521],[-72.7965,45.9176],[-72.7168,45.8498],[-73.0497,45.8332],[-73.2205,45.8332]]]],"circles":[]} |
| CapTimeZone | America/Toronto |
| CapDayBasis | area-centroid-timezone |
| CapSeverity | Moderate |
| DailyPeakCapSeverity | Moderate |
| CapUrgency | Future |
| CapCertainty | Likely |
| Urgency | Future |
| Certainty | Likely |
| Headline | yellow advisory - frost - in effect |
| Description | Temperatures will drop to near or below the freezing mark overnight tonight. ### Damage to plants, trees, and crops is possible. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to QCstorm@ec.gc.ca or post reports on social media using #QCStorm. |
| SenderName | Environment Canada |
Safety information
What to do in a winter storm or extreme cold
Three things first, then what to do before, during and after. From FEMA’s Ready.gov and the US National Weather Service.
For this reportSevere Weather · Sorel-Tracy
Stay off the roads
Travel only if you must. If you are stuck in a car, stay in it, run the engine a few minutes an hour with the exhaust clear of snow.
Ready.govHeat safely
Never heat the house with an oven, a barbecue or a generator indoors: carbon monoxide kills without warning.
Ready.govWatch for frostbite and hypothermia
Numb, white or greyish skin; shivering, confusion, slurred speech. Get warm and get help.
Ready.gov
Before, during, after. Here it is “after”.
Before · When a storm or a cold wave is forecast
Supplies for several days
Water, food, medicines, torches, batteries.
A kit in the car
Blankets, water, snacks, jump leads; keep the tank full.
Carbon monoxide alarm
Install and test one, with the smoke alarms.
Ready.gov (FEMA)
During · In the storm or the cold
Layers
Several warm layers, hat and gloves; limit time outside.
Shovel slowly
Hard effort in the cold strains the heart.
Generators outdoors
At least six metres from windows and doors.
Ready.gov (FEMA)
After · When it passes
Warm frostbite gently
With body heat or warm (not hot) water; do not rub.
Warm hypothermia from the core
Chest, neck, head and groin first, in dry blankets.
Check on others
Older people, children and pets.
Ready.gov (FEMA)
Questions people ask
How do I recognise hypothermia?
Shivering, exhaustion, confusion, fumbling hands, memory loss, slurred speech, drowsiness. Get the person warm and call for help. Source: Ready.gov (FEMA).
Can I use a gas oven to heat the house?
No. Ovens, barbecues and generators indoors produce carbon monoxide, which kills without warning. Source: Ready.gov (FEMA).
Should I stay in a car stuck in snow?
Yes: it is shelter, and people are found more easily with their car. Keep the exhaust pipe clear of snow. Source: Ready.gov (FEMA).
Review the area, threshold and delivery channel in your account.