Monthly Webinar 12.07/2010
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- Dustin Barrett
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1 Monthly Webinar 12.07/2010
2 -Assessment of current water conditions - Precipitation Forecast - Recommendations for Drought Monitor
3
4 Upper Colorado Normal Precipitation Upper Colorado River Basin Normal Monthly Precipitation 6 5 KREMMLING GRAND LAKE 6 SSW BERTHOUD SUMMIT Precipitation (in) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Month
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9 Upper Colorado Headwaters 145% of average
10 Snotel Percentile Rankings (at least 25 years of data)
11 Upper Colorado River Basin
12 Green River Basin above Flaming Gorge
13 Snowpack % of average to date: 117% Seasonal average: 34%
14 Duchesne River Basin
15 Snowpack % of average to date: 149% Seasonal average: 38%
16 Upper Colorado above Kremmling
17 Snowpack % of average to date: 142% Seasonal average: 35%
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19 San Juan Basin
20 Snowpack % of average to date: 55% Seasonal average: 16%
21 Michael Lewis USGS
22 7-day average discharge compared to historical discharge for the day of the year (December 4)
23 Upper Colorado River Basin- Comparison of 7-day Average Discharge For December 4, Percentage of streamgages in discharge category Discharge Category high much above normal above normal normal below normal
24 Colorado River near CO-UT State Line 34 th Percentile 84% of Normal Green River at Green River, UT 41 st Percentile 92% of Normal San Juan River near Bluff, UT 37 th Percentile 90% of Normal
25 Cumulative Runoff Colorado River at CO-UT Line December 4, 2010 Total runoff: 3.5 M acre-ft 78% of normal
26 Cumulative Runoff Green River at Green River, UT December 4, 2010 Total runoff: 3.2 M acre-ft 74% of normal
27 Cumulative Runoff San Juan River at Bluff, UT December 4, 2010 Total runoff: 0.85 M acre-ft 49% of normal
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29 Flaming Gorge November Reservoir Storage Max Capacity Ave Thousand AF
30 Lake Granby November Reservoir Storage Max Capacity 400 Thousand AF Ave
31 Green Mountain November Reservoir Storage Max Capacity Ave Thousand AF
32 300 Lake Dillon November Reservoir Storage 250 Max Capacity Ave Thousand AF
33 900 Blue Mesa November Reservoir Storage 800 Max Capacity Ave Thousand AF
34 Navajo Lake November Reservoir Storage Max Capacity Ave Acre Feet
35 Lake Powell November Reservoir Storage Max Capacity Ave Acre Feet
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37 Temperature Departure from Normal 11/1/ /30/2010
38 Temperature Departure from Normal 12/1/ /6/2010
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40 Upper CO Briefing 07 XII 2010 Upper Colorado Outlook into 2012 Klaus Wolter University of Colorado, CIRES & NOAA-ESRL PSD 1, Climate Analysis Branch La Niña: Too Big to Fade! MEI Outlook into 2012 (1 st cut) Expectations for next few weeks What does La Niña mean for the Upper Colorado Basin? Other influences?
41 Current state of ENSO (bottom) compared to three weeks ago (top): our La Niña weakened for about a month or so (top), almost losing its SST anomalies of more than -1C; 2 nd wind has kicked in, with easterly wind anomalies right along the Equator across much of the basin helping to maintain this event. Niño 3.4
42 How long will this La Niña last? Two year analog cases, plus climatology and persistence thru next April (green line): 5 of 6 twoyear analog predictions show persistent La Niña into 2012
43 What can we expect in the next two weeks? Agreement between European (left) and American model (GFS; right) for middle of next week troughs to our west & east, and weak ridging right over us; negative NAO déja vu renders much of Europe and U.S. East coast cold!
44 What can we expect in the next two weeks? Precipitation chances for 4-6, 6-10, and 8-14 days from last night show a familiar wet pattern from northern California into northwest Colorado, weakening by next week. Best shot at precip statewide will be over the weekend, with southeast Colorado being least favored.
45 A little refresher on seasonal ENSO impacts: our mountains tend to be WET with La Niña rather than El Niño during WINTER only - spring goes back to being dry with La Niña. This year: a wet October-November was a good set-up for our northern mountains!
46 What is difference for Year 1 vs. Year 2 Las Niñas? For Upper Basin, the second snow accumulation season (right) tends to be drier than the first one (left) in prolonged La Niña scenario. This is based on seven La Niña cases since 1949 with at least a tendency to continue into following winter.
47 What is difference for Year 1 vs. Year 2 Las Niñas? Mean flow for Year 1: MAf ( = +1.7MAf) Mean flow for Year 2: MAf ( = -1.4MAf) Difference is significant with more than 0.7 standard deviations! A drier outcome has been typical (8 of 10 cases) for 2nd year runoff for the Colorado River. Six of the first year runoff totals were clearly above the long-term mean, while seven of the second year runoff totals were clearly below that.
48 Lees Ferry naturalized runoff in Water Year onset behavior of ENSO (left) + early season precip (right) ENSO flavor favors low runoff (left), while early wetness favors high runoff (right) so far. Need to assess what a near-normal forecast has meant in the past.
49 Lees Ferry naturalized runoff in Water Year 2012 Since 1980, this particular tendency in the north-south temperature difference across the Arabian Sea has been highly related to Year-2 runoff this would favor the opposite (wet) outcome than the typical Year-2 La Niña scenario. Need to assess hindcast skill stay tuned!
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51 Join Us Next Month!
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