As a storm system approached Utah from the south, canyon winds developed over northern Utah, with strong winds observed on October 17.
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 SLC wrote it up.
As a storm system approached Utah from the south, canyon winds developed over northern Utah, with strong winds observed on October 17.
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 Oct 17, 2:51 AM MST, 5 hours 9 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 351 AM MDT Wed Oct 17 2018 .SYNOPSIS...An upper level low over northern Arizona will move slowly north across Utah through Thursday. High pressure aloft will build in behind the exiting low pressure Friday through the upcoming weekend. && .SHORT TERM (Until 00Z Sunday)...The upper low currently positioned over northern Arizona will take a slow north-northeast track across Utah through Thursday. A couple of vorticity lobes rotating around the low along with favorable thermal advection will lead to sufficient synoptic-scale lift and widespread precip along the northern and eastern flanks of the low as it moves through the state. A vorticity lobe rotating west-northwest across southern Utah along with weak low-level warm advection has spawned areas of light precip overnight. This first surge of precip will likely remain on the light side before dissipating as the vorticity lobe moves out of the state. The baroclinic structure of the advancing low will become much improved this afternoon/evening. Increasing low and mid-level warm advection in the eastern/northern flanks of the low along with increasing dynamic support for lift should produce widespread light/moderate precip across mainly central/eastern Utah this afternoon through the overnight hours. Can not rule out embedded convection with brief heavy precip near the mid-level cold pool at the center of the low late this afternoon through this evening. Heading into Thursday the upper low will begin to wind down as it drifts into northeast Utah. Thermal advection looks to be less of driving force for lift as it too weakens during the morning. Suspect that precip will begin to take on a more convective nature as cold air instability near the center remains a factor. By late afternoon/evening the remnant of the upper low begins to shear to the east as it become absorbed by the fairly strong shortwave diving southeast into the northern Plains states late Thursdays night/Friday. The Rex block setting up along the west coast Friday will leave most of Utah under dry/stable conditions through Saturday. The blocking pattern looks to be short-lived as the ridge shifts into the interior west late Saturday and the low portion of the old block gradually strengthens along the California coast. This low could pump some moisture north into southwest Utah, leading to a few convective showers late in the day Saturday. .LONG TERM (After 00Z Sunday)...Global models have all trended toward a much more active solution with the 00Z runs for the long term forecast period. A relatively weak but slow moving upper level low will be located off the southern California coast Saturday evening. Diffluent flow ahead of this low combined with a decent moisture tap should provide an impetus for precipitation across the Desert Southwest through the time this low...and then open wave cross the Interior West (through late Tuesday, early Wednesday). Much of the global model guidance focus on a period of moderate rain across southwest Utah as early as Sunday morning, with precipitation continuing to move north and east into much of the rest of the state through the day Sunday into Monday. It should be noted that much of yesterday's guidance was far less bullish with this system. Started markedly increasing PoPs through the long term forecast period, but remain behind what the 00Z global model consensus would suggest due to a notoriously poor performance in closed low/ejecting low across the southwestern United States. Bottom line: widespread precipitation is possible late this weekend into early next week. This system would be relatively warm...with high snow levels and near normal temperatures across the state. && .AVIATION...Expect southerly winds to continue at the SLC terminal into the morning...with a northerly wind developing between 18-19Z. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && SHORT TERM...CONGER LONG TERM/AVIATION...KRUSE 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 558 AM MDT Wed Oct 17 2018 UTZ001>016-019>021-517-518-WYZ021-181200- 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- 558 AM MDT Wed Oct 17 2018 This Hazardous Weather Outlook is for the western two thirds of Utah and southwest Wyoming. .DAY ONE...Today and Tonight Showers across southern Utah this morning will expand northward across central and eastern Utah through tonight. Snow levels will lower to around 7,000 feet, though heavier accumulations will generally remain above 8000 feet. Road snow is possible across the higher passes. Hunters need to prepare for cold temperatures and accumulating snow. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Valley rain and mountain snow will continue through the day Thursday. Accumulations are possible above 7000 feet, with the greatest amounts over the central mountains and the Wasatch Plateau and Book Cliffs. High pressure aloft will set up across the outlook area Friday through the weekend. This high pressure will bring warmer temperatures and mostly dry conditions to the area. Moisture could return to extreme southwest Utah Sunday, then gradually increase across the outlook area early in the upcoming week. Widespread precipitation could develop across southern and western Utah for Monday and Tuesday. .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
1 high wind. Local standard time, as filed.
The US-89 at Park Lane sensor recorded a peak wind gust of 58 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2018Every state in 2018This day in weather historyWarnings in Utah, October 2018
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: 782609.