A line of showers with an embedded isolated thunderstorm produced severe wind gusts in the western portion of the Uinta Basin.
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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 SLC wrote it up.
A line of showers with an embedded isolated thunderstorm produced severe wind gusts in the western portion of the Uinta Basin.
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 30, 1:00 PM MST, 4 hours 55 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 200 PM MDT Thu Apr 30 2020 .SYNOPSIS...A series of weather disturbances will bring the threat of showers and thunderstorms to mainly the northern half of Utah and southwest Wyoming through Saturday. A strong cold front will cross the state late Sunday into Monday bringing much cooler temperatures into early next week. && .SHORT TERM (Through 00Z Sunday)...Ongoing shower and thunderstorm activity is associated with a shortwave approaching western Idaho this afternoon and evening. The associated cold front was near the northwest corner of Utah early this afternoon and will continue to shift southeastward through the evening and overnight hours. Afternoon mesoanalysis indicates increasing instability...with up to 1000 J/kg of SBCAPE expected by mid to late afternoon across much of northern Utah, mainly Wendover to Salt Lake City and north. This combined with 30-40kts of deep layer shear should be sufficient for the development of at least occasionally organized convection. Forecast soundings continue to show a well-mixed boundary layer with a markedly dry subcloud environment supportive of gusty winds due to dry microbursts. A few storms could also have transitory periods of small hail...as several studies have linked dry subcloud environments to a reduction in melting of falling hailstones. Latest CAMS still attempt to largely develop convection near the Utah/Nevada border in the axis of highest instability and move that convection into the Wasatch Front by late afternoon/early evening. Will continue to monitor trends. Any convection should gradually diminish after sunset. As previously mentioned, the weak cold front will continue to shift south and east tonight into Friday morning, setting up roughly from Delta to Duchesne or so Friday afternoon. This may be a focus for showers and even a few thunderstorms but with a lack of significant synoptic lift, unlike today, the threat for organized convection is low. Cooler temperatures can be expected north of the front Friday...though cooler is still about 5-7 degrees above normal for much of the area. Temperatures are expected to warm several additional degrees Saturday. Another round of showers/thunderstorms is expected across northern Utah Saturday afternoon and evening...though again these are not expected to be organized. Climate-wise...it seems unlikely Salt Lake City will receive enough precipitation to avoid breaking the April record for the least amount of precipitation during the month of April. The period of record begins in 1874. Currently Salt Lake City has received 0.26" of precipitation for the month of April. The record for the month is 0.45" set in 1981 and 1934. .LONG TERM (After 00Z Sunday)...Southwest flow aloft continues Sunday/Monday as a weakening trough moves inland over the Pacific NW and tracks into the Northern Rockies. The weakening trough axis eventually cross our area and pushes a cold front through at least northern and possibly central Utah. Sensible weather impacts for our area will be limited to mainly afternoon/evening showers and thunderstorm threats from around Ogden to the Unitas northward. There is some uncertainty regarding the southern extent of this trough axis. One scenario would push shower activity a bit farther south, around the I-80 corridor. Other than shower/thunderstorm activity, the other sensible weather question is the cooling magnitude with the associated cooler air mass. There is a good chance that Monday night / Tuesday morning will reach freezing temperatures in the Cache Valley and other mountain valleys of central and northern Utah. Residents in those areas with sensitive with sensitive plants may want to consider the possibility of a frosty morning. Looking at the National Blend of Model's probabilistic temperatures, it appears the Wasatch Front should remain above freezing in even the coldest scenario. Either way, highs Monday/Tuesday will remain around normal for central and northern Utah, while southern Utah remains quite warm with only a minimal change in high temperatures. A ridge aloft will build over the Great Basin by mid week, supporting another warming trend (to around 10 degrees above normal) and a good chance of dry conditions. The WPC Cluster Tool shows some uncertainty in how quickly the ridge progresses through our area, but in all scenarios the weather appears largely benign for most of Utah and southwest Wyoming. && .AVIATION...Mainly VFR conditions are expected over the SLC terminal, with a chance of vicinity thundershowers possible between 23-04Z. There is a 15% chance that thunderstorms will directly impact the terminal during the aforementioned time. Gusty and erratic winds, as well as lowering CIGs to ~8kft AGL, will be possible with passing showers. Otherwise, northerly flow will revert back to southerly flow around 02-03Z. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && Kruse/Van Cleave/Webber 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 822 AM MDT Thu Apr 30 2020 UTZ001>016-019>021-517-518-WYZ021-011300- 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- 822 AM MDT Thu Apr 30 2020 This Hazardous Weather Outlook is for the western two thirds of Utah and southwest Wyoming. .DAY ONE...Today and Tonight Showers and thunderstorms are expected to continue to develop this afternoon and evening across the northern half of Utah. Small hail, gusty winds and frequent lightning are expected with the stronger thunderstorms. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Showers and thunderstorms are expected once again Friday afternoon and evening and Saturday afternoon and evening, mainly across the northern half of Utah. Gusty winds and small hail will be the main threats. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. 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
Special Weather Statement National Weather Service Salt Lake City UT 203 PM MDT Thu Apr 30 2020 UTZ005-302100- Great Salt Lake Desert and Mountains UT- 203 PM MDT Thu Apr 30 2020 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN BOX ELDER AND NORTHWESTERN TOOELE COUNTIES UNTIL 300 PM MDT... At 201 PM MDT, National Weather Service Doppler radar indicated strong thunderstorms along a line extending from 12 miles south of Oakley Reservoir to 24 miles south of Wendover...and moving east at 30 mph. Pea size hail and winds in excess of 40 mph will be possible. Locations impacted include... Park Valley, Utah Test and Training Range, Knolls, Dugway Proving Ground Test Range, Etna, Standrod, Grouse Creek, Lynn, Bonneville Salt Flats, Lucin, Rosette and Yost. This includes Interstate 80 in Utah between mile markers 1 and 43. PRECAUTIONARY/PREPAREDNESS ACTIONS... If threatening weather approaches, take shelter in a sturdy building. Strong winds with these storms may occur well ahead of any rain or lightning. Do not wait for the sound of thunder before taking cover. SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from windows. && LAT...LON 4199 11323 4024 11320 4032 11401 4199 11403 TIME...MOT...LOC 2001Z 270DEG 25KT 4199 11397 4040 11392 Kruse
Special Weather Statement National Weather Service Salt Lake City UT 312 PM MDT Thu Apr 30 2020 UTZ005-302215- Great Salt Lake Desert and Mountains UT- 312 PM MDT Thu Apr 30 2020 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BOX ELDER COUNTY UNTIL 415 PM MDT... At 311 PM MDT, National Weather Service Doppler radar indicated a strong thunderstorm 7 miles southwest of Juniper, or 19 miles west of Snowville...moving northeast at 45 mph. Additional strong thunderstorms are located near east and southeast of Park Valley moving northeast at 45 mph. Pea size hail and winds in excess of 40 mph will be possible. Locations impacted include... Snowville, Park Valley, Curlew Junction and Rosette. This includes Interstate 84 between mile markers 1 and 7. PRECAUTIONARY/PREPAREDNESS ACTIONS... If threatening weather approaches, take shelter in a sturdy building. && LAT...LON 4200 11264 4145 11333 4167 11365 4200 11322 TIME...MOT...LOC 2111Z 242DEG 37KT 4196 11309 CRK
The Salt Lake City radar (KMTX), 184 km away, was scanning. The volume nearest the first event began at 00:56 UTC.
3 thunderstorm wind. Local standard time, as filed.
The US-40 at MP 66 Fruitland sensor recorded a peak wind gust of 66 mph.
The US-40 @ Starvation sensor recorded a peak wind gust of 59 mph.
A peak wind gust of 58 mph was recorded at Roosevelt Municipal Airport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2020Every state in 2020This day in weather historyWarnings in Utah, April 2020
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: 889922, 889917, 889921.