Right now
The most recent data we hold from CAP CA ECCC arrived 34 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
Official warning
This warning has expired. Its original text remains below.
Highest level recorded for this local day: Moderate.
Level in this notice: Moderate.
Environment Canada
yellow advisory - frost - in effect
Temperatures are expected to fall to near the freezing mark early this morning.
###
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 ONstorm@ec.gc.ca or post reports on social media using #ONStorm.
Take preventative measures to protect cold-sensitive plants, trees, and crops. Cover up plants, especially those in frost-prone areas.
This alert expired on 6 October 2026 at 15:17 UTC. It is kept here as a record.
It is one of only 2 we have recorded within 20 km of this point since 4 April 2026. The last comparable one was on 2 October 2026. One more was recorded here in the fortnight before it.
What the source measured
CAP CA ECCC reported: Temperatures are expected to fall to near the freezing mark early this morning. ### 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 ONstorm@ec.gc.ca or post reports on social media using #ONStorm.
Urban PEI: 145,005 within a heuristic 50 km radius; not unique people.
Nearby, since 4 April 2026
- September 3, 2026 · 19.8 km
- September 2, 2026 · 20.3 km
- September 2, 2026 · 20.4 km
How we know
One source: CAP CA ECCC. 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 | 0.64/1 |
| Coordinates | 42.7965, -82.2995 |
| Nearest city | Port Huron (22 km) |
| Urban exposure index (PEI) | 145.0K within 50 km |
| Impact tier | significant |
| Timestamp | 2026-10-06T09:01:00.000Z |
| Source | https://dd.weather.gc.ca/today/alerts/cap/20261006/CWTO/09/T_WZCN86_C_CWTO_202610060901_1998275614.cap |
| Licence | ECCC Data Services End-use Licence 2.1.1 · Environment and Climate Change Canada · Grouped by area and local day; 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: 2026-10-06T09:01:00.000Z.
First archived: 2026-10-06T15:16:59.778Z. Material modification: not recorded.
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 | Sarnia - Petrolia - Western Lambton County |
| Geocodes | [{"name":"layer:EC-MSC-SMC:1.0:CLC","value":"041320"},{"name":"profile:CAP-CP:Location:0.3","value":"3538003"},{"name":"profile:CAP-CP:Location:0.3","value":"3538004"},{"name":"profile:CAP-CP:Location:0.3","value":"3538007"},{"name":"profile:CAP-CP:Location:0.3","value":"3538016"},{"name":"profile:CAP-CP:Location:0.3","value":"3538018"},{"name":"profile:CAP-CP:Location:0.3","value":"3538019"},{"name":"profile:CAP-CP:Location:0.3","value":"3538025"},{"name":"profile:CAP-CP:Location:0.3","value":"3538030"},{"name":"profile:CAP-CP:Location:0.3","value":"3538031"},{"name":"profile:CAP-CP:Location:0.3","value":"3538035"}] |
| Onset | 2026-10-06T09:01:00-00:00 |
| Effective | 2026-10-06T09:04:26-00:00 |
| Expires | 2026-10-06T15:17:26-00:00 |
| TimeBasis | onset |
| LocalDay | 20261006 |
| 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 are expected to fall to near the freezing mark early this morning. ### 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 ONstorm@ec.gc.ca or post reports on social media using #ONStorm. |
| Instruction | Take preventative measures to protect cold-sensitive plants, trees, and crops. Cover up plants, especially those in frost-prone areas. |
| 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 · Port Huron
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.