Quote:
Originally Posted by jc_yyc_ca
That's so crazy. Calgary has been bone dry since late June, and we're not that far apart geographically. Usually we share fairly similar weather systems.
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AI aided answer:
Why Edmonton Has Been Getting Hammered by Thunderstorms This Summer While Calgary Hasn't
For summer 2026, Edmonton hasn't just been unlucky. The atmosphere has been repeatedly setting up in a way that favors central Alberta, and the storms themselves may be helping maintain that pattern. Edmonton has officially recorded its wettest summer on record, exceeding 500 mm of rainfall and surpassing the previous record from 1953.
1. The Storm Track Has Been Pointed at Central Alberta
Many of this summer's storms have formed along the foothills and Rockies, then moved northeast. Forecast discussions have repeatedly highlighted storms developing west or northwest of Calgary and tracking through the Red Deer–Edmonton corridor.
That places Edmonton in the path of storms that have already had time to organize and strengthen.
Think of it this way:
Calgary is often where storms are born.
Edmonton is where many of them mature.
2. Edmonton Has Been Sitting Under the Moisture Highway
Thunderstorms need three things:
Moisture
Instability
Lift
This summer Edmonton has repeatedly had all three. Environment Canada meteorologists have specifically pointed to abundant moisture and continued warm temperatures as major contributors to the persistent severe weather pattern.
3. Calgary Is Close to the Factory, Edmonton Is Downstream
Being close to the mountains helps trigger storms, but it can also create:
Downslope drying
Storm splitting
Localized wind effects
Areas of temporary stability
Meanwhile, storms that survive and strengthen often move northeast into central Alberta where Edmonton is located.
4. A Moisture Feedback Loop May Be Developing
This is where things get especially interesting.
Because Edmonton and central Alberta have been repeatedly drenched, there is now:
Standing water everywhere
Saturated fields
Full ponds and sloughs
Wet vegetation
When the sun comes out, all of that water evaporates.
Meteorologists refer to this as evaporation and evapotranspiration. The moisture enters the lower atmosphere, increasing humidity and raising dew points.
That extra moisture becomes additional fuel for the next round of thunderstorms.
The cycle looks like this:
Storm drops heavy rain.
Water remains on the ground.
Heat returns.
Water evaporates into the atmosphere.
Humidity increases.
New storms have more moisture available.
More rain falls.
Repeat.
Environment Canada's observation that heat and abundant moisture are helping sustain the pattern is consistent with this kind of feedback mechanism.
5. The Atmosphere Is Recycling Its Own Fuel
With over 500 mm of rain already recorded this summer, central Alberta has effectively become its own moisture source.
Of course, the main moisture source remains larger-scale weather systems and air masses moving into Alberta, but the saturated landscape can enhance local humidity and help support additional convection.
In simple terms:
The storms are making the ground wetter, the wet ground is making the air wetter, and the wetter air helps support more thunderstorms.
That doesn't create storms by itself, but it can help reinforce an already favorable weather pattern.
6. Why It Feels So Relentless
Many recent storms have produced very high rainfall rates, including about 30 mm in roughly an hour during one Edmonton event. Flooding, power outages, fallen trees, and repeated severe thunderstorm warnings have followed.
The result is that Edmonton residents experience:
Storm
Cleanup
Sun
Humidity
Another storm
while Calgary has often spent more time in warmer, drier conditions between systems.
Bottom Line
My meteorological take on 2026 is:
A persistent foothills-to-central-Alberta storm track has repeatedly directed mature thunderstorms into the Edmonton region. Record rainfall has produced widespread saturated ground and standing water, increasing local evaporation and atmospheric moisture. This additional moisture likely helps reinforce an already favorable environment for convection, creating a feedback loop that makes the pattern feel self-sustaining. Edmonton has effectively been sitting beneath both the storm highway and the resulting moisture reservoir.
Or in Alberta terms:
Calgary keeps lighting the match. Edmonton keeps getting the bonfire—and then using the water from the bonfire to help build the next one. 😄
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