Yellow Warning - Rainfall
4:26 a.m. PDT Wednesday 18 March 2026

Impact Level: Moderate

Forecast Confidence: High


Prolonged Atmospheric River Event

Where: Inland Vancouver Island

What and when:
- Periods of heavy rain continues this afternoon to Friday

Impacts:
-Prolonged heavy rain on snow combined with mountain snow melt could lead to very enhanced responses in river systems and potential for flooding.
-Extensive water pooling on roads and washouts may occur.
-Enhanced risk of landslides due to saturation of landscapes.

Remark:
An atmospheric river will remain over the South Coast of B.C. through Friday. With freezing levels near 2000 to 3000 metres, snowmelt from higher elevations may increase the impacts associated with this rainfall event.

Rain is expected to intensify again this afternoon to Friday under the influence of of the atmospheric river. The heaviest rainfall is expected Thursday night into Friday.

Water will likely pool on roads and in low-lying areas. Some travel delays are possible. Landslides may occur in vulnerable areas such as steep slopes, deforested areas or recent burn scars. Fast-moving and rapidly rising water can sweep vehicles away and damage infrastructure.

Watch for washouts near rivers, creeks and culverts.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to BCstorm@ec.gc.ca or post reports on X using #BCStorm.

In effect for:
  • Inland Vancouver Island

Observed at: Port Alberni
Date: 7:00 AM PDT Wednesday 18 March 2026
Temp.: 8 °C
Wind: calm km/h
Humidity: 99 %
Dew point: 8 °C
Pressure: 101.3 kPa
Tendency: 0.00 kPa
Visibility: km
Sunrise: 7:27
Sunset: 19:29
Normals:
Max 11°C Min 0°C
 Extended Forecast - Environment Canada
Today
Periods of rain
Periods of rain
Max: 12°C
Thu, 19 Mar
Rain
Rain
Max: 12°C
Fri, 20 Mar
Showers
Showers
Max: 13°C
Sat, 21 Mar
Sunny
Sunny
Max: 8°C
Sun, 22 Mar
Chance of showers (60%)
Chance of showers
Max: 8°C
Mon, 23 Mar
A mix of sun and cloud
A mix of sun and cloud
Max: 10°C
Tue, 24 Mar
Chance of showers (60%)
Chance of showers
Max: 9°C
Tonight
Rain
Rain
Min: 8°C
Night
Rain
Rain
Min: 9°C
Night
Cloudy
Cloudy
Min: 2°C
Night
Chance of showers (30%)
Chance of showers
Min: 2°C
Night
Chance of showers (60%)
Chance of showers
Min: 1°C
Night
Chance of showers (60%)
Chance of showers
Min: 2°C
 

Forecast

Port Alberni, BC (Issued: 5:00 AM PDT Wednesday 18 March 2026)

Today
Periods of rain. Amount 5 to 10 mm. Wind becoming south 20 km/h gusting to 40 near noon. High 12. UV index 1 or low.
Tonight
Rain. Amount 10 to 15 mm. Low 8.
Thu, 19 Mar
Rain. Amount 15 to 25 mm. High 12. UV index 1 or low.
Night
Rain. Low 9.
Fri, 20 Mar
Showers. High 13.
Night
Clearing. Low plus 2.
Sat, 21 Mar
Sunny. High 8.
Night
Cloudy periods with 30 percent chance of showers. Low plus 2.
Sun, 22 Mar
Cloudy with 60 percent chance of showers. High 8.
Night
Cloudy with 60 percent chance of showers. Low plus 1.
Mon, 23 Mar
A mix of sun and cloud. High 10.
Night
Cloudy with 60 percent chance of showers. Low plus 2.
Tue, 24 Mar
Cloudy with 60 percent chance of showers. High 9.

24 Hour Forecast - Port Alberni, BC

Date/Time Temp.
(°C)

Weather Conditions

LOP †
Wind
(km/h)
18 March 2026
8 AM 7 Periods of rain (100%)  Periods of rain 100 S 15
9 AM 8 Periods of rain (100%)  Periods of rain 100 S 15
10 AM 10 Periods of rain (100%)  Periods of rain 100 S 15
11 AM 11 Periods of rain (100%)  Periods of rain 100 S 15
12 PM 11 Periods of rain (100%)  Periods of rain 100 S 20 gust 40
1 PM 12 Periods of rain (100%)  Periods of rain 100 S 20 gust 40
2 PM 12 Periods of rain (100%)  Periods of rain 100 S 20 gust 40
3 PM 12 Periods of rain (100%)  Periods of rain 100 S 20 gust 40
4 PM 11 Periods of rain (100%)  Periods of rain 100 S 20 gust 40
5 PM 11 Periods of rain (100%)  Periods of rain 100 S 10
6 PM 11 Rain (100%)  Rain 100 S 10
7 PM 10 Rain (100%)  Rain 100 S 10
8 PM 10 Rain (100%)  Rain 100 VR 5
9 PM 10 Rain (100%)  Rain 100 VR 5
10 PM 9 Rain (100%)  Rain 100 VR 5
11 PM 9 Rain (100%)  Rain 100 VR 5
19 March 2026
12 AM 9 Rain (100%)  Rain 100 VR 5
1 AM 8 Rain (100%)  Rain 100 VR 5
2 AM 8 Rain (100%)  Rain 100 VR 5
3 AM 8 Rain (100%)  Rain 100 VR 5
4 AM 8 Rain (100%)  Rain 100 VR 5
5 AM 8 Rain (100%)  Rain 100 VR 5
6 AM 8 Rain (100%)  Rain 100 VR 5
7 AM 8 Rain (100%)  Rain 100 VR 5
 
† Likelihood of Precipitation (LOP) as described in the public forecast as a chance of measurable precipitation for a period of time.
  Nil: 0%
  Low: 40% or below
  Medium: 60% or 70%
  High: Above 70%

Environment Canada