A thunderstorm over Zion National Park produced flash flooding over portions of the Park.
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The episode as NWS SLC wrote it up.
A thunderstorm over Zion National Park produced flash flooding over portions of the Park.
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 May 9, 2:53 PM MST, 7 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 353 PM MDT Thu May 9 2019 .SYNOPSIS...An unsettled weather pattern will remain in place through today as a series of weak weather systems pass through the region. Drier and more stable air will slowly move into northern Utah and southwest Wyoming Friday into Saturday, while the south remains unsettled through the weekend. && .SHORT TERM (Through 00Z Monday)...A longwave trough is currently set up across the western CONUS and is in the process of splitting. The southwestern portion of this split will gradually shift south and west through tonight into Friday. A few main concerns... First up...the threat of widespread rain across portions of southern utah tonight into Friday morning. With the upper trough splitting nearly overhead...the southern split will gradually shift westward and strengthen. As this occurs, expect a period of enhanced warm air advection to cross southern Utah. Upslope flow and relatively high moisture should favor a period of moderate precipitation...with 6 hour amounts between 0.25 and 0.50". The window for the highest precipitation rates and widespread precipitation will be roughly 3 to 6 hours. The main impact from this rain will be ponding in poor drainage areas as well as higher flows in normally dry washes and area streams. Those who are planning recreational activities including camping overnight should be aware of the threat of elevated flows. Next up...another round of enhanced canyon winds for the northern Wasatch Front and the Cache Valley. Winds peaked earlier this morning near about 48 mph at the Park Lane sensor near Centerville. Expect enhanced canyon winds again tonight into Friday morning but likely remaining below wind advisory criteria as conditions are less favorable. As the previously mentioned upper level low continues to shift southwestward Friday...drier air will gradually build into the state from north to south. Convection will be possible each afternoon...mainly diurnally driven...through at least Saturday. .LONG TERM (After 00Z Monday)...Model consensus continues to lean towards stronger ridge amplification over the northern Great Basin/Rockies region early next week, with the remnant and filling low translating east and downstream at lower latitude than previous solutions. Have continued to trend forecast towards a much drier/stable outcome into the midweek period as such. Some isolated terrain based and shallow convection remains possible diurnally each day, but does not look to be the norm. For the latter half of the week focus shifts upstream to the evolution of the next long wave trough (and embedded short waves) that will be impinging on the western basin early, and the local area late in the week. The big picture depiction in guidance has been fairly well resolved for several runs, but ejecting short wave features remain less certain in timing and strength through Thursday. Have continued to trend forecast for greater coverage of convection Thursday across the northwest/terrain towards a mean solution, but anticipate more focused precip will evolve thereafter into the weekend with further trough influence. && .AVIATION...Scattered clouds are expected around the KSLC terminal through the evening hours under VFR conditions. Northerly winds will continue to swing to the northeast as the gradient for the east- canyon winds remains overnight, however speeds should weaken overnight. Winds shifting to the southeast after 12z Friday. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && Kruse/Merrill/Dewey 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 446 AM MDT Thu May 9 2019 UTZ001>016-019>021-517-518-WYZ021-101100- 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- 446 AM MDT Thu May 9 2019 This Hazardous Weather Outlook is for the western two thirds of Utah and southwest Wyoming. .DAY ONE...Today and Tonight Enhanced easterly canyon winds will continue along portions of the northern Wasatch Front and Cache Valley through the morning hours, with the strongest winds expected near Farmington, Weber, and Logan Canyons. This may impact travel along some north to south oriented routes. Relatively cool and unsettled conditions will continue over Utah and southwest Wyoming today, resulting in another round of showers and thunderstorms. Coverage will be best this afternoon and this evening, with the showers most numerous over the higher terrain. Brief heavy rain, gusty winds, small hail, and lightning are possible with any storms that develop. .DAYS TWO THROUGH SEVEN...Friday through Wednesday The focus of shower and thunderstorm activity will shift into southern Utah Friday as northern Utah and southwest Wyoming see a warming and drying trend into the upcoming weekend. Scattered thunderstorms will remain possible across southern Utah through the upcoming weekend. The warming temperatures across northern Utah and southwest Wyoming will increase snowmelt at the mid and high elevations, resulting in streams and rivers running high, fast and cold. These conditions can be expected to continue across the outlook area through the remainder of the Spring. Monitor children and pets closely near these waterways. .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), 44 km away, was scanning. The volume nearest the first event began at 22:01 UTC.
1 flash flood. Local standard time, as filed.
Zion National Park officials reported flash flooding in numerous slot canyons and creeks across the eastern portion of the Park.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2019Every state in 2019This day in weather historyWarnings in Utah, May 2019
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: 829197.