Winter Storm Data 2019 – 2020


This Precip and Storm Report Excel Workbook contains the current and past 13 seasons of CSAS winter storm data, including:

  • Dates, times and duration of each winter storm event (2003-current)
  • Change in the height of snow at both our alpine Senator Beck study plot and our subalpine Swamp Angel site.
  • Peak gust data from our Putney site.
  • Mean and maximum precipitation intensity during each storm
  • Total new water accumulation in mm for each storm event.
  • Summary data for each month of the season.
  • Cumulative annual precipitation graph by month
Past Winter Storm Reports:

See our Current Conditions for the latest hourly dataAll times shown are in Mountain Standard Time (MST)

2019-2020 Winter Storm Reports
January 16-17:  CSAS Storm #10
Greetings from Silverton,
Over 26 hours ending on January 17 we received storm #10.  It was accompanied by pretty stiff winds for the duration of the storm with gusts as high as 73 mph.  Visibility was often very low with the blowing snow.
This was our first storm since January 2, but some weather systems have come through over the last couple weeks delivery ~2″ precip.  Still, so far this month we struggled a bit except for a few high mountain locales.  The snowpack is hanging in there with SWE in most major basins looking like the state-wide SWE plot below.   Forecasted precip over the next 7 days is not that exciting, looks like we get a chance this Tuesday going into Wednesday, benefiting Northern Colorado a bit more than the San Juans.
December 29 – January 2: CSAS Storm #8 and #9, 
Greetings from Silverton,
A couple of short storm events rolled through the last few days.  The first Dec 29 – Dec 30, and the second Jan 1 – 2.  The latter storm was pretty wet and dense.  Stiff winds were out of the north for both storms, likely explaining why some stations just to the south did not receive near what we did at Swamp Angel.
We are doing a little over an inch better in terms of precipitation, and have received 2 storms more than the average, for this time of year.  Starting mid-week we will see a trough roll through with still a lot of uncertainty about the extent and severity of this system.  Keep your eyes on the forecast.
More Soon,
December 28: CSAS Winter Storm #6 and #7, 2.2″ Precipitation Since Christmas Eve
Greetings from Silverton,

I hope everyone had a great Christmas and been able to get out in the snow this week.  Since Christmas Eve Swamp Angel has received 2.2″ of precipitation and accumulated about a 1.5′ of snow over 2 storm events.  Storm #6, Dec. 24-25, brought close to an inch of precipitation while Storm #7, Dec 27-28, brought about the same with the remaining coming from a six hour period on the 26th.  Both storms were mainly out of the south with peak gusts hitting 58 mph on Friday.

The snowpack now sits at 4.4′ (1.34 meter).  Not bad, all major basins in Colorado are sitting at median SWE or better.

As storm #7 tapers off we will see mostly dry and cold conditions.  Temps are forecasted to stay 10-15 degrees below normal.  Northern and Central mountains will see a chance of precip Wednesday with the best chance on Thursday.  We’ll see another chance of precip on Sunday with Northern/Central Mountains looking to benefit the most.

Click here for Storm #6 and Storm #7 Report.
CSAS Winter Storm #5: December 13-15

Greetings from Silverton,


Another productive storm just rolled through Colorado.  From December 13-16 at Senator Beck Basin on Red Mt Pass we received 1.2″ precipitation at Swamp Angel Study Area (11,060′) and snow accumulation gain of about 1′.  We have received 7.4″ of precipitation since the start of snow season which began the last few days of October but did not start amounting to anything until the November 20 storm.  For the water year we are very near average precipitation thus far (9″ vs 9.4″ average).  The SNOTEL Basin precipitation plots are showing similar information.  A good start to the winter, compared to last year you may recall Southern Colorado struggled through Christmas with 2/3 normal snowpack, but came back with a vengeance starting January onward.  Its nice not playing catch up so far.
Storm reports 1-5 are now posted to our website.  The plan is to issue storm report email updates for the duration of the snow season when we receive at least 12 mm precipitation with no break in precipitation greater than 12 hours.  If you would like to also receive our dust-on-snow email updates please let me know.
If you don’t subscribe to our dust-on-snow email notifications I would like to make you aware that our “Snow School for Water Professionals” class will be held February 19-21.  This a combination classroom/field learning class designed for folks wanting to learn more about the role of snow in our mountain environments as it pertains to water resources.  Please see the attached flyer for more information and don’t hesitate to contact me with any questions.

Click here for storm report.

More from Silverton soon.

CSAS Winter Storm #4: December 7 – 9, 2019

Click here for storm report.

CSAS Winter Storm #3: November 27 – 30, 2019

Click here for storm report.

CSAS Winter Storm #2: November 25 – 26, 2019

Click here for storm report.

CSAS Winter Storm #1: November 20 – 21, 2019

Click here for storm report.