Saturday 1 June 2013

Rainstorm Totals

     A Colorado Low which stalled over the Dakotas late this week brought rounds of moderate rainfall Thursday and Friday to southern Manitoba. Again, due to the northeasterly winds, the same areas along the escarpment that were hard hit by a similar storm just 2 weeks ago got severely hit once again. 80+ mm of rainfall has been recorded near Miami, Deerwood and west of Morden. In fact, 121.7 mm of rainfall was recorded 17 km southwest of Miami by a Cocorahs observer. This follows the localized amounts of 100-200 mm from the May long weekend storm.

     Here's a map of rainfall totals across southern Manitoba. I have resized the map to make it easier to read compared to the summary I made 2 weeks ago. The colour code helps give an idea of where the heaviest amounts fell.






     The heavy rainfall has caused flooding problems to many areas. Some stretches of highway were closed due to overland flooding and creeks bursting from their banks. Road flooding was reported in the city of Morden thanks to a nearby creek which overflowed from its banks.

     Here's a map of the Winnipeg area:


     Heaviest amounts were generally in southern and central sections with a little over 50 mm reported in some parts.

     I have made a table which evaluates how well the rainfall forecasts I made on Thursday morning for a few select cities across Manitoba. Check out how the forecast faired here.

     For this weekend, sunny skies are in the cards thankfully. However, cold temperatures will mean evaporation of all the standing water wont be as quick as some would maybe like. In fact, localized frost looks possible tonight with lows between 0 and +2°C expected. May summary is coming this evening.

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Rainfall amounts courtesy of Cocorahs weather observers, Environment Canada, Manitoba Agriculture, robsobs and thanks to Willy for his report from Winnipeg.

11 comments:

  1. Just realised that 13 mm in Sprague might be erroneous. 13.2 mm fell in Sprague on May 30 and it rained there yesterday so I'm not sure why EC says 13 mm for the 2 day period. Ignore that 13 mm as a result.

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    1. Not might be erroneous, but IS erroneous.

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  2. Well since EVERYONE lost in the old thunderstorm poll, I added a new one...

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  3. Thanks for putting my Obs on the rainfall summary. By the way I got 86.3 MM of rain this month, do you know the normal rainfall for may? Hopefully june isn't as soggy as may was!

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    1. 1971-2000 normal for May rainfall is 58.0 mm.

      However, I have estimated the 1981-2010 normal May rainfall to be 57.4 mm so not a big difference. I say estimated because of the poor data quality in the 2000's. I suspect the final number from EC will be a tad different.

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  4. JJ,
    the new thunderstorm poll said after i voted " your vote has already been counted", and i didn't vote before that.

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    1. I'll delete the old one, let me know what that does.

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  5. Excellent layout and stats Did most of these may showers occur on weekends?

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    1. Luckily this particular one ended just before the weekend ;) But it rained almost the entire May long-weekend 2 weekends before!

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