More Rain to Come

     A very slow-moving cold front last night in the RRV helped trigger one of the biggest rain events of the year in Winnipeg. A heavy thunderstorm remained stationary over central and southwestern parts of the city for over an hour. Generally 40-80 mm of rain fell from Charleswood to Whyte Ridge to dowtown. Much lower amounts fell in southeastern, eastern and northern parts of the city where amounts ranged anywhere from a trace mm to 30 mm. I received 16 mm here in River Park South. Here are some amounts from yesterday via Cocorahs, Weatherfarm, Environment Canada and other backyard stations (Robsobs, Kyle, Matt and myself) (including the rains from the morning):

Community	Rainfall total August 21, 2014
Whyte Ridge	60-84 mm
Bridgwater Forest	70 + mm
Lindenwoods	57-66 mm
Downtown (UofW)	64.8 mm
St James	50.6 mm
Charleswood	41.9 mm
Old St Vital	29-31 mm
South St Vital	17.9 mm to 31 mm
Wpg Int’l Airport	20.6 mm
Transcona	5-7 mm

    Considering the normal August rainfall in Winnipeg is 79.2 mm, some parts of the city saw a month's worth of rain in just 2 hours. It's no mystery that there was major road-flooding last night. The rain is also on top of another heavy rain event in the Lindenwoods area  (30-40 mm) back on Monday.

     It was also extremely moist/humid yesterday. With a maximum dewpoint observation of 21.5°C at the airport at 6:00 pm, we were just shy of a dewpoint record (old is 21.7°C in 1969). However, the minimum dewpoint observation yesterday was just 17.2°C, a record high minimum for the day. Old record high minimum dewpoint was 15.1°C in 1981.

     Unfortunately, the gloomy weather continues. Cloudy skies are expected today and tomorrow with minimal breaks in the cloud. A bit of drizzle or light rain may fall at times before the big rain event tomorrow night.

More rain is on the way

     A strong low pressure system moving up from the United States will bring a widespread rain event to southern Manitoba late tomorrow into Sunday. At this time, it appears the bulk of the rain will begin tomorrow evening for Winnipeg and last until Sunday morning. The rain may be quite heavy at times and there may be a few embedded thunderstorms. 15-30 mm or more could fall throughout the RRV and southeastern Manitoba, including Winnipeg. Localized amounts up to 40 mm are possible under the heaviest bands and if any thunderstorms do occur, but most areas will see less than that. Stay tuned in the comments below for updates.

     Scattered showers with embedded thunderstorms remain possible through the afternoon and evening on Sunday. There could even be some sun, allowing temperatures to reach low 20's. Generally cloudy skies look to continue Monday with a few showers possible at times. Chilly, fall-like conditions look to continue through to mid-week before things begin to warmup by the end of the week.