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[9pm Update] The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – March 27, 2018

Forecast Discussion: The storm is ongoing Monday evening as I write, so I'll update this place later in the day with some weather reports. [9pm update - Snow and Rain totals!] Figures 1 and 2 are Boulder county 24 hour totals...

This content was originally published by the Longmont Observer and is licensed under a Creative Commons license.

Forecast Discussion:

The storm is ongoing Monday evening as I write, so I'll update this place later in the day with some weather reports.

[9pm update - Snow and Rain totals!]

Figures 1 and 2 are Boulder county 24 hour totals... Longmont almost got to an average of 1/5th of an inch of water (great for the lawns!) and a trace to 1/4th inch of snow.  Boulder did much better with 2.5-5 inches of snow.

Figures 3 and 4 are Larimer county 24 hour totals... Estes got about 1/4th inch of water, Ft. Collins only got a few hundredths of an inch of water.  Berthoud stayed under 1/10th inch. As for snow, only a trace was seen from Ft. Collins down to Berthoud, Estes park got 3-4 inches of snow.

Figures 5 and 6 are the Denver Metro 24 hour totals... they were the big winners on my 'region.'  the northern suburbs saw 1/3rd to 1/2 inch while an inch of water fell on the south and southwestern areas. The northern regions saw 1-3 inches while the southern foothills had 4-7.5 inches.  Great water for them!

Figure 1 update: CoCoRaHS rainfall reports as of 9pm Tuesday for Boulder, CO.

Figure 2 update: CoCoRaHS snowfall reports as of 9pm Tuesday for Boulder, CO.

Figure 3 update: CoCoRaHS rainfall reports as of 9pm Tuesday for Larimer, CO.

Figure 4 update: CoCoRaHS snowfall reports as of 9pm Tuesday for Larimer, CO.

Figure 5 update: CoCoRaHS rainfall reports as of 9pm Tuesday for Denver Metro.

Figure 6 update: CoCoRaHS snowfall reports as of 9pm Tuesday for Denver Metro.

The longer range forecast:

The 10 day graphical look at the weather in Figure 1 shows a VERY similar storm (in the gross features) to this one hitting Monday/Tuesday.  After that, things get very sketchy, but there are many changes of precipitation coming.  This might be a nice spring after all (even though many ski resorts are setting their closing dates in April).

Figure 1: the 10 day GFS temperature (top) and ensemble precipitation (bottom) forecast for Denver from weather5280.com