Subtropical moisture in the region resulted in scattered thunderstorms, and one storm in Routt County produced a funnel cloud.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GJT wrote it up.
Subtropical moisture in the region resulted in scattered thunderstorms, and one storm in Routt County produced a funnel cloud.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Junction, CO wrote its last area forecast discussion before the first event at Jul 26, 4:52 AM MST, 4 hours 52 minutes earlier.
Area Forecast Discussion National Weather Service GRAND JUNCTION CO 552 AM MDT Wed Jul 26 2017 .SHORT TERM...(Today through Thursday) Issued at 242 AM MDT Wed Jul 26 2017 Convection continued during the night along an elongated vort lobe from northern Grand County in eastern UT to Routt County in western CO. Expect this convection to weaken and decrease during the morning hours as the vort lobe should weaken and lose its identity. Also some convection persisted in west-central CO associated with a disturbance embedded in the flow just south of the vort lobe, and this activity should exit our CWA by sunrise. As the already elongated upper high extending from NM to AR is expected to further elongate westward, our CWA will be under a more westerly flow aloft today and Thursday which will suppress the flow of subtropical moisture for our area. However, the flow aloft over eastern UT and western CO should be relatively light which should allow residual moisture to remain over our CWA. Models indicate PWATs to be around an inch or a little higher today across our CWA, with little change on Thursday. So still expect at least scattered showers and thunderstorms through Thursday mainly in the afternoon and evening hours, with locally heavy rain possible. However, since any heavy rainfall should be only localized, no FFA should be needed today or Thursday. .LONG TERM...(Thursday night through Tuesday) Issued at 242 AM MDT Wed Jul 26 2017 Strong high pressure should be over the region Friday and Saturday with models indicating main concentration of diurnal showers and thunderstorms for our CWA to be over SE UT and W-Central/SW CO, favoring mountains. This appears to be similar to the situation experienced over our CWA last weekend. However, models are indicating a little seepage of subtropical moisture back into the southern portion of our CWA on Saturday. GFS and EC then surge subtropical moisture northward into our area beginning Saturday night, continuing through Monday. The models then decrease the subtropical moisture some on Tuesday, though each model has a different reason for the decrease. So, not a lot of confidence for significant changes on Tuesday. Lowered the max temperatures at least several degrees for many locations and raised the min temperatures from blended model solution starting Saturday night. If this monsoonal surge still looks to be on track for later shifts, then later shifts should take a look at the temperatures that will be input to our grids from the blended models, as they will likely need to be adjusted back to something similar as what was done during this shift. && .AVIATION...(For the 12Z TAFS through 12Z Thursday morning) Issued at 543 AM MDT Wed Jul 26 2017 Residual moisture will keep a few showers and isolated thunderstorms this morning mainly from Grand County UT to southern Routt and Eagle Counties in CO...with local MVFR ceilings and visibilities. Showers and thunderstorms will increase to scattered in coverage this afternoon and into the evening hours, favoring the mountains, a few with heavy rain, small hail, and surface wind gusts to 30 mph. The showers and thunderstorms are expected to begin decreasing after 02Z this evening. Otherwise, VFR conditions will prevail at all TAF sites through 12Z Thursday. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...None. UT...None. && SHORT TERM...JRP LONG TERM...JRP AVIATION...JRP
Hazardous Weather Outlook National Weather Service GRAND JUNCTION CO 345 AM MDT Wed Jul 26 2017 COZ001>014-017>023-UTZ022>025-027>029-270945- Lower Yampa River Basin-Central Yampa River Basin- Roan and Tavaputs Plateaus-Elkhead and Park Mountains- Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor- Central Colorado River Basin-Grand and Battlement Mesas- Gore and Elk Mountains/Central Mountain Valleys- Central Gunnison and Uncompahgre River Basin- West Elk and Sawatch Mountains-Flat Tops- Upper Gunnison River Valley-Uncompahgre Plateau and Dallas Divide- Northwest San Juan Mountains-Southwest San Juan Mountains- Paradox Valley/Lower Dolores River- Four Corners/Upper Dolores River-Animas River Basin- San Juan River Basin-Southeast Utah-Eastern Uinta Mountains- Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat- La Sal and Abajo Mountains-Canyonlands/Natural Bridges- 345 AM MDT Wed Jul 26 2017 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Expect isolated thunderstorms this morning mainly north of I-70 in northwest Colorado, then scattered thunderstorms this afternoon and evening across the entire area favoring the mountains. Locally heavy rain and small hail will be possible this afternoon and early evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Scattered afternoon and evening thunderstorms will occur again on Thursday, then mainly south of I-70 on Friday and Saturday. Thunderstorms will then increase across the entire area starting Saturday night or Sunday with heavy rain possible from some storms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated today.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
923 AM MDT WED JUL 26 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0704 AM HEAVY RAIN 2 SSW TRIMBLE 37.38N 107.87W
07/25/2017 M1.10 INCH LA PLATA CO TRAINED SPOTTER
THE DURATION OF THE HEAVY RAIN EVENT WAS 24
HOURS.
&&
MMSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
924 AM MDT WED JUL 26 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0556 AM HEAVY RAIN 4 S DURANGO 37.23N 107.87W
07/25/2017 M0.98 INCH LA PLATA CO TRAINED SPOTTER
THE DURATION OF THE HEAVY RAIN EVENT WAS 24
HOURS.
&&
MMSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
925 AM MDT WED JUL 26 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1147 AM HEAVY RAIN 1 SSW HERMOSA 37.41N 107.86W
07/25/2017 M0.84 INCH LA PLATA CO TRAINED SPOTTER
THE DURATION OF THE HEAVY RAIN EVENT WAS 12
HOURS.
&&
MMSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
929 AM MDT WED JUL 26 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0807 AM HEAVY RAIN 5 NW MACK 39.27N 108.93W
07/26/2017 M0.63 INCH MESA CO TRAINED SPOTTER
THE DURATION OF THE HEAVY RAIN EVENT WAS 24
HOURS.
&&
MMSThe Cheyenne radar (KCYS), 187 km away, was scanning. The volume nearest the first event began at 16:47 UTC.
1 funnel cloud. Local standard time, as filed.
A funnel cloud was photographed just west of Rabbit Ears Pass by a person who was traveling on Highway 40.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2017Every state in 2017This day in weather historyWarnings in Colorado, July 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 704702.