Subtropical moisture remained over the Four Corners Region which resulted in another round of showers and thunderstorms that produced heavy rain and localized flooding.
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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 remained over the Four Corners Region which resulted in another round of showers and thunderstorms that produced heavy rain and localized flooding.
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 22, 4:46 PM MST, 14 minutes earlier.
Area Forecast Discussion National Weather Service GRAND JUNCTION CO 546 PM MDT Sat Jul 22 2017 Updated aviation discussion .SHORT TERM...(Tonight through Sunday night) Issued at 323 PM MDT Sat Jul 22 2017 Drier air continues to move over eastern UT and western CO from the north. Deepest moisture is over far southeastern UT and southwestern CO. A weak shear axis over southwestern CO along with heating and orographics have produced slow moving showers and thunderstorms over and near the southwestern San Juan Mountains. Some of theses storms could produce heavy rainfall. The dry air continues to push south and should reach the southern border of our forecast area by mid evening. Expect a downturn in activity compared to the last few days as this drier mid level air moves overhead. For Sunday afternoon and early evening isolated showers and thunderstorms over the higher terrain will be possible due to the lingering moisture and day time heating. .LONG TERM...(Monday through Saturday) Issued at 323 PM MDT Sat Jul 22 2017 The upper ridge axis starts to slide east Monday. The latest models have a weak disturbance moving into the Four Corners during the afternoon or evening. This could open the door for deeper moisture and upper level support for development of storms with heavy rainfall. Will have to watch for this feature in the next few model runs for consistency. The ridge continues east into the plains and allows the next moisture surge to push northward. After only a day to day and a half the models now want to build the ridge back over the Four Corners which would allow convective activity from lingering moisture but keep the tap to the deeper moisture south and east. If this scenario develops there would be another down turn in thunderstorm activity the end of next week. Would like to see a few more model runs to gain better confidence. && .AVIATION...(For the 00Z TAFS through 00Z Sunday evening) Issued at 546 PM MDT Sat Jul 22 2017 Moisture staying confined to SE Utah and SW Colorado this evening as expected. A couple more hours of tstorms before convection stratifies out to some lingering showers. KTEX and KDRO the only TAF sites expected to potentially receive some showers/tstorms over the next few hours...and thus the only sites that may possibly reach ILS breakpoints. Conditions will dry overnight and bring downslope/upslope winds over the next 24 hours. Showers and tstorms will develop again over the San Juans around 18z Sunday. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...Flash Flood Watch until 9 PM MDT this evening for COZ019. UT...None. && SHORT TERM...AS LONG TERM...AS AVIATION...JAM
Hazardous Weather Outlook National Weather Service GRAND JUNCTION CO 358 AM MDT Sat Jul 22 2017 COZ001>014-017>023-UTZ022>025-027>029-231000- 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- 358 AM MDT Sat Jul 22 2017 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Drier air will continue moving in from the north resulting in a decrease in thunderstorm coverage today compared to the previous few days. Thunderstorm activity will be focused mainly over the higher terrain during the afternoon and evening, with the best chances across the central and southern mountains and adjacent southern valleys. Locally heavy rain, small hail and gusty winds are possible with storms today. Flash flooding concerns will be more localized over steeper terrain and not as widespread as previous few days. .DAYS TWO THROUGH SEVEN...Sunday through Friday A drier airmass will be over the region Sunday, resulting in reduced thunderstorm coverage through Monday with storms limited to mainly the higher terrain during the afternoon. Another surge of moisture moves in as early as Tuesday, resulting in an increase in thunderstorm activity through the coming week. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
Special Weather Statement National Weather Service Grand Junction CO 345 PM MDT SAT JUL 22 2017 COZ022-222230- Animas River Basin CO- 345 PM MDT SAT JUL 22 2017 ...SPECIAL WEATHER STATEMENT... At 342 PM MDT, Doppler radar was tracking a strong thunderstorm 7 miles north of Cedar Hill, or 16 miles northeast of Aztec, moving southeast at 5 mph. This storm has been producing frequent cloud-to-ground lightning. Additionally, half inch hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Bondad. This includes U.S. Highway 550 in Colorado between mile markers 1 and 10. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rainfall is also likely occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3716 10798 3713 10781 3700 10776 3700 10800 TIME...MOT...LOC 2142Z 324DEG 5KT 3704 10787 JRP
Special Weather Statement
National Weather Service Grand Junction CO
354 PM MDT SAT JUL 22 2017
UTZ028-222245-
La Sal and Abajo Mountains UT-
354 PM MDT SAT JUL 22 2017
...SIGNIFICANT WEATHER ADVISORY FOR UNTIL 445 PM MDT...
At 353 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles southwest of La Sal. This storm was nearly stationary.
Nickel size hail and winds in excess of 30 mph will be possible with
this storm.
Locations impacted include...
La Sal.
This includes U.S. Highway 191 in Utah between mile markers 94 and
101.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall is also likely occurring with this storm, and may
lead to localized flooding. Do not drive your vehicle through
flooded roadways.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Junction.
&&
LAT...LON 3817 10937 3820 10942 3826 10944 3831 10934
3829 10928 3823 10927
TIME...MOT...LOC 2153Z 050DEG 4KT 3823 10938
JRPSpecial Weather Statement National Weather Service Grand Junction CO 442 PM MDT SAT JUL 22 2017 COZ006-009-011-222330- Grand and Battlement Mesas CO-Grand Valley CO- Central Gunnison and Uncompahgre River Basin CO- 442 PM MDT SAT JUL 22 2017 ...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL DELTA AND CENTRAL MESA COUNTIES UNTIL 530 PM MDT... At 439 PM MDT, Doppler radar was tracking a strong thunderstorm 12 miles northwest of Delta, or 22 miles southeast of Grand Junction. This storm was nearly stationary. Nickel size hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Orchard City and Skyway. This includes Colorado Highway 65 near mile markers 6 and 41. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. SEEK SHELTER NOW inside a sturdy structure or vehicle. Lightning is a killer. && LAT...LON 3879 10823 3894 10832 3908 10813 3884 10796 TIME...MOT...LOC 2239Z 057DEG 3KT 3889 10821 JRP
Special Weather Statement National Weather Service Grand Junction CO 457 PM MDT SAT JUL 22 2017 UTZ022-029-222345- Southeast Utah UT-Canyonlands/Natural Bridges UT- 457 PM MDT SAT JUL 22 2017 ...SPECIAL WEATHER STATEMENT... At 455 PM MDT, Doppler radar was tracking a strong thunderstorm 13 miles northwest of Bluff, or 20 miles southwest of Blanding, moving southwest at 15 mph. This storm has been producing frequent cloud-to-ground lighting. Additionally, half inch hail and winds in excess of 30 mph will be possible with this storm. This storm will remain over mainly rural areas of southeastern San Juan County. This includes U.S. Highway 163 in Utah between mile markers 33 and 37. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rainfall is also likely occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3753 10969 3740 10952 3724 10974 3742 10992 TIME...MOT...LOC 2255Z 037DEG 12KT 3742 10975 JRP
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
A thunderstorm with heavy rainfall produced 0.61 of an inch within 30 minutes. Minor street flooding was reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2017Every state in 2017This day in weather historyWarnings in Utah, 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: 712854.