A trough moved through Utah on April 18, producing showers and thunderstorms; a severe wind gust was reported with one of those thunderstorms.
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The episode as NWS SLC wrote it up.
A trough moved through Utah on April 18, producing showers and thunderstorms; a severe wind gust was reported with one of those thunderstorms.
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 Apr 18, 3:33 PM MST, 37 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 433 PM MDT Tue Apr 18 2017 .SYNOPSIS...A cold front will cross the area tonight. Another storm is possible Thursday into Friday. && .SHORT TERM (Thru 12Z Friday)...A broad upper low remains in place in the ern Pac this afternoon. A short wave trof ejecting out of this low is moving into the Great Basin. A stalled frontal boundary remains across nrn UT and has started moving south again with areas of rain and isolated thunderstorms developing along and north of it. Scattered showers and thunderstorms are forming over sern NV and wrn UT and these will increase across w-central and swrn UT thru this eve. The CA trof lifts thru UT tonight with a decent amount of moisture and modest upper support. The cold front currently between Provo and Delta will accelerate southward tonight and surge thru the CWA accompanied by a broad band of heavy precip. Cooler air north of the cold front has limited the surface based instability this aftn and as a result, the severe weather threat is pretty much non existent in this area the rest of today and this eve. The most unstable air sits south of the front across wrn UT and there remains a threat of brief wind gusts around 50kt with cells in that area. Winds ahead of the front area gusting into the 30 to low 40 mph range and do not expect them to get any stronger thru this evening away of any storms. Widespread rain amounts of 0.5 to 0.75 inch or greater look likely up and down the I-15 corridor and in the adjacent mtns this eve. This looks to fall in a about a 6 hour window and minor urban flooding along with ponding of water on roads and in poorly drained areas could result. This rain plus ongoing snow melt from higher elevations is forecast to send the South Fork of the Ogden River above flood stage and a warning has been issued for this drainage above Pineview Reservoir. Snow levels will start out very high near 10000 ft and will lower to about 7000 to 8000 ft in the precip with some slushy accumulation on higher routes. Most major passes should run just wet. Post frontal winds could stay strong for a few hours in the ern valleys this eve but will drop off after midnight. Precip ends pretty quickly after midnight as the ejecting short wave moves off to the northeast. Limited instability lingering on Wed could generate a few aftn showers mainly north. The next trof arrives on Thu. This is forecast to be a negative tilt shearing feature with a cold front pushing into UT during the day along with scattered showers. EC is about 6 hours faster with the front and associated precip but the GFS does catch up by the end of the day. This system is a little colder during the precip period Thu but the airmass does cool down quite a bit more Thu night with lingering orographic snow showers possible across the north. This wave is also drier than the current system so water amounts will be much lighter. .LONG TERM (After 12Z Friday)...The mid-level low moves east of the area early Friday, leaving a relatively cool (fcst SLC H7 temps around -8C) and dry airmass in its wake. Although mid-level temps warm somewhat and cloud cover thins, the stability of the airmass/modest northerly surface gradient should keep maxes around 5-10 degrees below climo on Friday. Significant warming begins on Saturday as a mid-level ridge axis moves overhead and 700 flow develops more of a southerly component. The warming trend continues on Sunday as the ridge moves eastward and southwesterly flow aloft increases in response to a deepening trough over the west coast. Fcst maxes on Sunday are forecast to run about 10 degrees above normal in most locations, with maxes possibly reaching/exceeding 90 in Utah's Dixie. The aforementioned trough moves north of the area late Sunday/early Monday and at this time it appears that the bulk of the energy/precip associated with this feature will remain north of the area. The GFS does depict this feature pushing a boundary through northern Utah on Monday which cools temps 5-10 degrees relative to Sunday. The Euro/Canadian are less bullish on any cooling, so using a blend of guidance for Monday's temps resulted in in most locations experiencing only a couple degrees of cooling between Sunday/Monday. The next potentially significant Pacific storm system begins to approach the area on Tuesday resulting in increasing cloud cover and eventually a chance of frontal precipitation. However at this point any details on timing/intensity of this system are difficult to pin down due to the usual issues associated with model consistency at the day 7+ range. && .AVIATION...Winds at the SLC terminal should increase from the northwest through the afternoon and evening, with a chance of gusts greater than 30 mph between 23Z and 03Z. There is also a chance of thunderstorms through 03Z, which could be accompanied by erratic and stronger winds. MVFR conditions will be possible under the heavier rain showers. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && SHORT TERM...Wilensky LONG TERM...Carr AVIATION...Schoening 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 345 PM MDT Tue Apr 18 2017 UTZ001>016-019>021-517-518-WYZ021-191300- 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- 345 PM MDT Tue Apr 18 2017 This Hazardous Weather Outlook is for the western two thirds of Utah and southwest Wyoming. .DAY ONE...This Afternoon and Tonight Rain showers will become more widespread across northern Utah and southwest Wyoming late this afternoon and locally heavy during the evening hours. Ponding of water on roadways will be possible, causing travel impacts. In addition, the heavy rain is expected to cause area rivers and streams to rise. Accumulating snowfall is also expected, mainly above 8000-8500 feet this evening and lingering overnight. Southwest winds will continue to gust to 40 mph across southwestern and south central Utah through the early evening hours. There is also a potential for stronger winds as a cold front crosses western and central Utah locations late this afternoon into the early evening with the small potential for strong or severe thunderstorms. .DAYS TWO THROUGH SEVEN...Wednesday through Monday The next colder storm is expected Thursday afternoon into early Friday. Snow levels will drop from around 8000 feet Thursday afternoon to near 6500 feet Thursday evening. .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 Salt Lake City radar (KMTX), 154 km away, was scanning. The volume nearest the first event began at 23:12 UTC.
1 thunderstorm wind. Local standard time, as filed.
The Causeway sensor in the U.S. Army Dugway Proving Ground mesonet recorded a peak wind gust of 60 mph.
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, April 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: 696208.