Weather Cooperation (or not) for Summer 2025.

Conditions mentioned in the above posting (post #30) remain applicable for July 31st, and for this final 2025 display. As such, here are the weather patterns for the greater Montreal area:

Temperature/Humidity

Being one of the coolest days this late-Spring to Summer, a more limited maximum temperature is favored (22-23 C) as Arctic high pressure slides SE, along with persistent afternoon cloud coverage limiting the extent of warming. By late-evening, including display time, the temperature should resemble that of the opening and Italian shows (19-20 C). Humidity would be low — the second lowest concentration across all display days/times this year, and so a Humidex is not applicable.

Precipitation

No rainfall/thunderstorm risk is envisioned for the first time this year. However, the aforementioned stationary front will continue to yield a fairly continuous cloud deck for principally the afternoon period following some morning sunny breaks. This cloud cover would be in the form of cirrus and a broken cumulus cloud deck, causing mostly fainter afternoon sunshine. Later in the afternoon, decreased lift should help promote more clear breaks that would become larger for the evening to create partly cloudy skies. This again would be under large patches of cirrus.

Wind

Wind velocities remain as mostly light Northerlies to eventually NNE during the day (a bit breezier at 13-17 km/h during the afternoon), and then to light NE for the evening (8-11 km/h). This would allow the light smoke accumulation, at all altitudes, to drift slowly towards viewers positioned on the bridge nearest to the river and neighboring portions of Notre-Dame Street, and towards the Old Port.

*If necessary, a brief update will be provided by this afternoon (July 31st) to address wind speed/direction.

Trav.

Montreal Fireworks Forum

Weather Cooperation (or not) for Summer 2025.

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	Smoke Member	#31 \| Posted: 31 Jul 2025 00:41
		Conditions mentioned in the above posting (post #30) remain applicable for July 31st, and for this final 2025 display. As such, here are the weather patterns for the greater Montreal area: Temperature/Humidity Being one of the coolest days this late-Spring to Summer, a more limited maximum temperature is favored (22-23 C) as Arctic high pressure slides SE, along with persistent afternoon cloud coverage limiting the extent of warming. By late-evening, including display time, the temperature should resemble that of the opening and Italian shows (19-20 C). Humidity would be low — the second lowest concentration across all display days/times this year, and so a Humidex is not applicable. Precipitation No rainfall/thunderstorm risk is envisioned for the first time this year. However, the aforementioned stationary front will continue to yield a fairly continuous cloud deck for principally the afternoon period following some morning sunny breaks. This cloud cover would be in the form of cirrus and a broken cumulus cloud deck, causing mostly fainter afternoon sunshine. Later in the afternoon, decreased lift should help promote more clear breaks that would become larger for the evening to create partly cloudy skies. This again would be under large patches of cirrus. Wind Wind velocities remain as mostly light Northerlies to eventually NNE during the day (a bit breezier at 13-17 km/h during the afternoon), and then to light NE for the evening (8-11 km/h). This would allow the light smoke accumulation, at all altitudes, to drift slowly towards viewers positioned on the bridge nearest to the river and neighboring portions of Notre-Dame Street, and towards the Old Port. *If necessary, a brief update will be provided by this afternoon (July 31st) to address wind speed/direction. Trav.

	Smoke Member	#32 \| Posted: 31 Jul 2025 20:14
		Latest/recent data supports more of a light ESE to SE flow (still 8-11 km/h, as mentioned in post #31) for this late-evening (July 31st). As such, light smoke accumulation would still be slowly moving away from the La Ronde audience, at all altitudes, but also more so to the right towards Notre-Dame Street going in the direction of the Olympic Stadium. All other conditions presented in post #31 remain valid. Trav.