Subtropical moisture produced some thunderstorms with heavy rainfall in San Miguel County.
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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 produced some thunderstorms with heavy rainfall in San Miguel County.
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 28, 3:00 PM MST, 0 minutes earlier.
Area Forecast Discussion National Weather Service GRAND JUNCTION CO 400 PM MDT Fri Jul 28 2017 .SHORT TERM...(Tonight through Saturday night) Issued at 400 PM MDT Fri Jul 28 2017 Forecast is panning out as expected today as the next batch of subtropical moisture advects northward into our forecast area. The effects of this latest surge have already been felt, especially in terms of precipitable water (PWAT), with this morning's RAOB measuring 1.02 inches...a marked improvement from yesterday's 00Z RAOB report of 0.71 inches. As far as the rest of the synoptic environment goes, the ridge of high pressure will continue to slowly migrate east, allowing a steady stream of moisture to persist through the weekend. Additionally, models have been consistent in bringing a midlevel closed low across the Four Corners region overnight. As the previous forecaster mentioned, this 500mb low center could provide additional lift late tonight so PoPs remain moderate to high. This added upper level support, paired with the abundance of low level moisture and the continued slow steering steering winds aloft, will keep the threat of localized flash flooding in the forecast through the short term, especially further south. This pairs well with WPC's excessive rainfall forecast for the short term which has central and south-western Colorado in a slight risk today and marginal risk tomorrow. .LONG TERM...(Sunday through Friday) Issued at 400 PM MDT Fri Jul 28 2017 Monsoonal moisture will continue to stream into the region for Sunday so another round of afternoon showers and thunderstorms can be anticipated. Models begin to differ on the intensity of moisture across the area Sunday and beyond with the GFS remaining the wetter solution at this time as it keeps PWATs above an inch for most of the CWA. The NAM on the other hand trends a little drier with an average PWAT of 0.80 inches. High pressure begins to re-establish itself to our west through midweek which will bring a general downturn in convection. However, since extended models keep the above normal PWATs through early next week there should be plenty of residual moisture to fire off scattered orographic showers and storms each afternoon. As far as temperatures go, after a cooler start on Sunday highs will gradually rebound through the new week as drier air is introduced. Even so, temperatures will remain below normal for this time of year. && .AVIATION...(For the 18Z TAFS through 18Z Saturday afternoon) Issued at 1147 AM MDT Fri Jul 28 2017 Scattered showers and thunderstorms through this evening. TAF site airports with highest probability of experiencing showers and thunderstorms will be KTEX and KASE, though potential exists into this evening for all TAF sites. Expect VFR conditions to prevail, though local MVFR ceilings/visibilities possible in heavy rainfall. Small hail also possible. Sfc gusts up to 35 KTs from outflow winds. A few showers and isolated thunderstorms likely to persist through tonight. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...None. UT...None. && SHORT TERM...MMS LONG TERM...MMS AVIATION...JRP
Hazardous Weather Outlook National Weather Service GRAND JUNCTION CO 431 AM MDT Fri Jul 28 2017 COZ001>014-017>023-UTZ022>025-027>029-291045- 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- 431 AM MDT Fri Jul 28 2017 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Expect scattered thunderstorms this afternoon and evening across the entire area, favoring the mountains, especially in the south. Locally heavy rain and small hail are possible. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Thunderstorms are expected to increase across the entire area from Saturday through Monday with heavy rain a continued threat. Thunderstorm activity will decrease Tuesday through Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The national radar mosaic for the moment the first event began.
1 debris flow. Local standard time, as filed.
A large amount of mud and other debris flowed across Colorado Highways 62 and 145 due as a result of heavy rainfall. The roads were closed for a while until the debris was removed.
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: 712904.