Atmospheric River in the Pacific Northwest and Northern Rockies this Weekend

A Pacific storm and atmospheric river will impact the Pacific Northwest states and northern Rockies this weekend, bringing locally heavy low elevations rain and heavy high elevation snow in the mountains. By Sunday over the Interior Northwest, rain combined with snowmelt will increase the risk of flood hazards. Flood Watches are in effect. Read More >

Overview

A Storm Damage Survey from the National Weather Service Forecast Office in Pueblo, CO was conducted, and a preliminary EF1 rating was given to the tornado which occurred Sunday evening between approximately 7:12 p.m. and 7:24 p.m.

Tornado Track


Tornado Narrowly Misses Two Houses	Tornado Misses a House Located on County Road PP

Photos & Video
Radar
Environment

Photos & Video:

Various Pictures of the Damage and the Tornado


Paths of Hay Swather that was Carried by the Tornado	Photo Credit: Janet Chenoweth Tornado was 100-150 yards wide; Photo of Tornado Taking out Power Poles	The Only Damage Indicator was the Damage Done to the Power Poles

Radar:

Radar Reflectivity and Velocity Scans of the Tornado Event


Radar Reflectivity Volume Scan of the Tornado Event	Radar Velocity Volume Scan of the Tornado Event

Environment

A developing upper-level low, centered over Utah on May 23rd, 2010 at 6:00PM MDT, was the major synoptic player in this tornado event. Looking at the surface analysis, there was strong surface flow from the southeast. Comparing Dalhart, Texas ASOS, which indicated southeasterly winds at 20 knots with 68 degree dew point temperature, and La Junta, Colorado ASOS, which indicated southeasterly winds at 30 knots with a 38 dew point temperature, it is clear that the main forcing mechanism was a dry line enhanced by orographic lift up the Arkansas River Valley and the Palmer Divide. The moisture gradient becomes even more apparent with dew point contours at 850-hPa and 700-hPa analyses. The 6:00 PM sounding from DNR indicated a very nicely shear atmosphere, with winds speeds at the surface around 10 knots from the southeast and winds aloft around 80 knots from the southwest. There is very little CAPE in the atmosphere, though, but since Baca County is far away from DNR, the DDC 6:00PM sounding would give a better representation of the instability in the atmosphere. At DDC, the CAPE value was 2575 J/kg*K and the shear profile was conducive for long lasting supercell thunderstorms. Interpolating the data between DDC and DNR, indicates a favorable environment for rotating updrafts.


Surface Analysis	850-hPa Analysis	700-hPa Analysis

500-hPa Analysis	300-hPa Analysis

Thermodynamic Upper-Air Soundings (Skew-T Log P Diagram)


KDNR Sounding	KDDC Sounding

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Atmospheric River in the Pacific Northwest and Northern Rockies this Weekend

Preliminary EF1 rating of Baca County Tornado 23 May 2010 (Updated 1015 a.m., 5/25/10)