Thu. Aug 22nd, 2019

Fascinating, Unprecedented, Frightening flooding in North America

  • Vancouver Island Inland Sections Forecast - No watches or warnings in effect.

    Forecast Issued 05:00 AM PDT Thursday 22 August 2019 - Thursday: Clearing. High 24. Humidex 26. UV index 8 or very high. Thursday night: Increasing cloudiness. 30 percent chance of showers overnight. Low 13. Friday: Cloudy with 40 percent chance of showers in the morning then a mix of sun and cloud. High 22. UV index 6 or high. Friday night: Cloudy periods. Low 12. Saturday: A mix of sun and cloud with 30 percent chance of showers. High 24. Saturday night: Clear. Low 13. Sunday: Sunny. High 24. Sunday night: Clear. Low 10. Monday: Sunny. High 28. Monday night: Clear. Low 11. Tuesday: Sunny. High 25. Tuesday night: Clear. Low 11. Wednesday: Sunny. High 26.

  • Current Conditions
    Temperature
    16.3° C
    1.3 ° C/hr
    Barometer
    101.78 kPa
    0.0
    Wind
    N/A 0 km/h
    gusting 0 km/h
    Humidity
    63 %
    Rain Rate
    0.0 mm/hr
    Wind Chill
    16.3° C
    Heat Index
    16.3° C
    Dewpoint
    9.2° C
    UV
    0.6
    Solar
    126 W/m2
    Last Updated: 8:15:00 PDT
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  • Today's Almanac
    Rain since Midnight
    0.0 mm
    Continuous Rainfall (< 24hr gap)
    No Qualifying Rainfall mm
    Civil Rise
    05:45
    Moon Phase
    Last quarter (60% full)
    Civil Set
    20:57
    Day Length
    13:22:04
    Day High
    18.0° C @ 00:00 Tdy.
    Day Low
    14.8° C @ 06:53 Tdy.
    Day High Rain Rate
    0.0mm/hr00:00
    Day High Barometer
    101.78 kPa @ 08:14 Tdy.
    Day Low Barometer
    101.53 kPa @ 00:00 Tdy.
    Day Low Windchill
    14.8° C @ 06:53 Tdy.
    Day High Heat Index
    18.0° C @ 00:00 Tdy.
    Day High Wind Gust
    S 2km/h @ 03:40 Tdy.
    Day High Solar Radiation
    225W/m2 @ 07:50 Tdy.
    Day High UV Index
    0.6 @ 07:49 Tdy.

The great plains of North America are currently experiencing the greatest flooding in 150 to 300 years.

CBC and CNN are both carrying footage live.

Today the Province of Manitoba intentionally breached a dyke on the Assiniboine River, flooding hundreds of houses and thousands of square km of land to protect against an uncontrolled breach that would threaten whole towns.

Assiniboine Breach
Picture from CBC News website of breach as it started flowing this morning.

The flow of the Assiniboine is currently 1/2 the rate of Niagara Falls.

Incredibly, at opposite ends of the central North America flood plain, the situation is even worse.
North America water basins

At 1PM today, the US Army Corps of Engineers will take the unprecedented step of having all 3 Mississippi flood diversion structures active at once when they open the Morganza Spillway. It will flood 2500 homes and threaten thousands more.

This is being done to protect the “Old River Control Structure” which keeps the Mississippi flowing through New Orleans and keep it from threatening millions in New Orleans and Baton Rouge and keeps that key economic centre of the US economy afloat, literally.

Old River Control Structure
The Old River Control Structure a couple days ago.

Why is all this happening? Major and persistent snowfall over the winter thanks to La Nina and big rains this spring. Global Warming could play a role as well as a warmer atmosphere will harbour more moisture and that moisture, whether snow or rain, ends up somewhere.

Morganza Spill Structure in 1973
Morganza Spill Structure the last time in 1973

Today, it is ending up, in incredibly dramatic ways, in Lake Manitoba and the Gulf of Mexico.

___________

Back home here, we can expect more rain over the weekend. Get out and about while you can. Late next week we should warm up a little.

1 thought on “Fascinating, Unprecedented, Frightening flooding in North America

  1. Wow, while it seems Manitoba has escaped the worst-case scenario, the fires in Alberta are wreaking havoc.  We sometimes need to just consider how fortunate we are.
    In fact, the EC forecast is now full of shiny yellow balls for the upcoming long weekend!  Could we hit 20C by Thursday? 

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