Frost
E
Issued by Environment Canada
⏳ In force until Thu 22 Oct, 04:52 📍 St. Catharines - Grimsby - Northern Niagara Region; Niagara Falls - Welland - Southern Niagara Region (approximate) 🕑 7 h ago
Patchy frost continues early this morning, mainly for areas away from Lake Erie and Lake Ontario. Patchy frost is expected to develop tonight into Thursday morning. ### 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.
🗃 Archived report - it is no longer on the live map. Pages are kept for 30 days.
📡 CAP alert details
Common Alerting Protocol
Official alert linked
▾
📡 CAP alert details
Common Alerting Protocol
⚠
SeverityModerate
⏱
UrgencyFuture
❓
CertaintyLikely
Eventfrost
Response typeMonitor
CategoryMet
Affected areaSt. Catharines - Grimsby - Northern Niagara Region; Niagara Falls - Welland - Southern Niagara Region
Issuing authorityEnvironment Canada
ContactNot supplied
🕓 Alert timing · EAT
Sent2026-10-21T09:54:42-00:00
Effective2026-10-21T09:52:57-00:00
Onset2026-10-21T09:45:00-00:00
Expires2026-10-22T01:52:57-00:00
📋 Official instructions
Take preventative measures to protect cold-sensitive plants, trees, and crops. Cover up plants, especially those in frost-prone areas.📄 Message details
Alert identifierurn:oid:2.49.0.1.124.2175750900.2026
Message typeUpdate
Sendercap-pac@canada.ca
ScopePublic
CAP statusActual
Related messagesurn:oid:2.49.0.1.124.3872057443.2026 urn:oid:2.49.0.1.124.2442339004.2026 urn:oid:2.49.0.1.124.0963734100.2026 urn:oid:2.49.0.1.124.0346781103.2026 urn:oid:2.49.0.1.124.2212655271.2026
ⓘ CAP fields populate when an official alert is linked.
🛡 Safety advice
General guidance for this type of incident - not official instructions.
- Take preventative measures to protect cold-sensitive plants, trees, and crops. Cover up plants, especially those in frost-prone areas.
- Stay aware of your surroundings in this area.
- Follow official updates from the police and local authorities.
- In an emergency call 112 (police) or 112 (ambulance), or request help through Jilinde.
📰 Story summary
From the report shown in the feed:
- Patchy frost continues early this morning, mainly for areas away from Lake Erie and Lake Ontario.
- Patchy frost is expected to develop tonight into Thursday morning.
- ### 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.
ⓘ News summary · read the original report for full context.
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