Orange Rainfall Warning for St. Catharines - Grimsby - Northern Niagara Region
This alert is no longer in effect.
ECCC issued it on August 3, 2026, 2 weeks ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this ECCC weather alert directly from ECCC's official public data feed. See our methodology for full source attribution and refresh cadence.
Environment Canada has issued an orange warning for rainfall in effect for the St. Catharines - Grimsby - Northern Niagara Region, with localized heavy rainfall and thunderstorms continuing until this evening.
Read this weather record in 30 seconds
- Record type
- Rainfall Warning
- Affected area
- Northern Niagara Region
- Issued
- August 3, 2026
- Issuing authority
- ECCC
The warning type, named area, and issue time define this record. Confirm all three against the original agency notice before treating it as current.
Record status: historical. It was issued 2 weeks ago; use the issuing agency's live warning service for current conditions in Northern Niagara Region.
Alert Details
Environment Canada has issued an orange warning for rainfall. The alert is classified as severe with future urgency. It was sent on 2026-08-03T01:17:14-00:00, effective from 2026-08-03T01:13:31-00:00, and expires at 2026-08-03T05:59:31-00:00.
Affected Areas
The warning covers St. Catharines - Grimsby - Northern Niagara Region in Ontario.
What You Should Do
Localized flooding is likely and some roads may become impassable. Residents should consult their local Conservation Authority or Ontario Ministry of Natural Resources office for flooding information. Continue to monitor alerts and forecasts from Environment Canada. Report severe weather by emailing ONstorm@ec.gc.ca or posting on social media using #ONStorm.
Expected Conditions
Total local rainfall amounts of 100 to 150 mm are expected, with poor visibility in torrential downpours. Local amounts have already exceeded 100 mm, including 107 mm at Port Weller. Additional rainfall up to 25 mm is expected this evening.
Timeline
The warning is in effect until this evening on 2026-08-03.
Original source: ECCC Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this ECCC weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,081 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 3, 2026.
Frequently Asked Questions
Common questions about this ECCC weather alert.