Strong thunderstorms over southern Utah produced flash flooding during the second week of July. The most significant of this flooding hit the town of Kanab on July 9.
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The episode as NWS SLC wrote it up.
Strong thunderstorms over southern Utah produced flash flooding during the second week of July. The most significant of this flooding hit the town of Kanab on July 9.
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 Salt Lake City, UT wrote its last area forecast discussion before the first event at Jul 9, 8:30 PM MST, 0 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 930 PM MDT Sun Jul 9 2017 .SYNOPSIS...Strong high pressure aloft will gradually weaken early in the week. Moisture will remain in place across the southern half of the region but will decrease some across the north as a drier more westerly flow develops Monday through midweek. && .DISCUSSION...High pressure aloft remains centered over south- central and southeast Utah this evening. PWATs between 0.8-1.1 inches remain widespread over the area. A shortwave disturbance will be crossing far northern Utah through late tonight. Scattered showers and thunderstorms developed today with wetter storms across the south and drier storms across the north producing gusty winds. Expect storms will be slower to wind down tonight given greater forcing, with a few storms lingering well into the overnight hours. In the wake of the disturbance, the airmass will see a bit of drying across northwest Utah tomorrow. Temperatures across northern Utah will be down 2-6 degrees from where they are today due to a slightly cooler airmass and the likelihood of more clouds. Elsewhere temperatures will remain 5-10 degrees above normal both Monday and Tuesday. && .AVIATION...Winds at the SLC terminal are expected to prevail from the south through the night, but may continue to be erratic and gusty through 06z due to outflow from various showers across northern Utah. There is a 10 percent chance of a thunderstorm at the terminal through 06z. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...Red Flag Warning from noon to 10 PM MDT Monday for UTZ478. WY...None. && Cheng For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity For frequently asked questions about the Area Forecast Discussion visit... http://weather.gov/saltlakecity/general/afd_faqs.php
Hazardous Weather Outlook National Weather Service Salt Lake City UT 405 PM MDT Sun Jul 9 2017 UTZ001>016-019>021-517-518-WYZ021-102215- Cache Valley/Utah Portion-Northern Wasatch Front- Salt Lake and Tooele Valleys-Southern Wasatch Front- Great Salt Lake Desert and Mountains-Wasatch Mountain Valleys- Wasatch Mountains I-80 North-Wasatch Mountains South of I-80- Western Uinta Mountains-Wasatch Plateau/Book Cliffs- Western Uinta Basin-Castle Country-San Rafael Swell- Sanpete/Sevier Valleys-West Central Utah-Southwest Utah- Utahs Dixie and Zion National Park-South Central Utah- Glen Canyon Recreation Area/Lake Powell-Central Mountains- Southern Mountains-Southwest Wyoming- 405 PM MDT Sun Jul 9 2017 This Hazardous Weather Outlook is for the western two thirds of Utah and southwest Wyoming. .DAY ONE...Tonight Increasing moisture across the region will lead to an increase in cloud cover and the development of scattered showers and isolated thunderstorms this evening. The showers and thunderstorms that do develop will produce some measurable rain, though amounts for the most part will remain light. This limited rainfall along with the gusty and erratic winds associated with the showers and storms will bring the potential for hazardous fire weather conditions to much of the outlook area this afternoon and evening. .DAYS TWO THROUGH SEVEN...Monday through Saturday Increasing moisture to begin the week will serve to expand the areal coverage of showers and thunderstorms on Monday. Locally heavy rainfall could develop out of some of the stronger showers and thunderstorms, especially across extreme southern Utah. Somewhat drier air will invade far northern Utah and southwest through Tuesday. Moisture will remain in place across central and southern Utah through midweek. Showers and thunderstorms that develop over those regions will have the potential to generate heavy rainfall, especially over the flood prone areas of southern Utah. High pressure aloft will strengthen once again across the region late in the week. Temperatures will climb again across the area with lingering afternoon and evening mountains showers and thunderstorm heading into the weekend. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. For more information from NOAA/s National Weather Service visit... http://weather.gov/saltlakecity For information on potential road travel impacts visit... http://www.udottraffic.utah.gov/roadweatherforecast.aspx
The Cedar City radar (KICX), 66 km away, was scanning. The volume nearest the first event began at 03:31 UTC.
4 flash flood. Local standard time, as filed.
Heavy rain over Kanab produced widespread flash flooding across the town. Multiple businesses suffered flood damage and approximately 20 homes had some mud or water in their basements. Many roads were flooded, and one drainage canal suffered damage.
The Utah Department of Transportation reported a flash flood and debris flow in Paragonah after heavy rain fell over the Brianhead burn scar. The flood waters came down Red Creek Canyon and reached all the way down to Main Street/State Route 271 in Paragonah.
Heavy rain caused flash flooding in portions of Capitol Reef National Park, including Cohab Canyon, Sulphur Creek, and Grand Wash.
Heavy rainfall on the Brianhead burn scar caused flash flooding near Panguitch Lake. The flooding was most significant along the Clear Creek drainage, with water overwhelming the culverts and side roads.
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: 715685, 715677, 715671, 715673.