Scattered thunderstorms developed over Utah on July 20, but only one severe thunderstorm wind gust was recorded.
Every event with a place to put it. Tap one for its entry below.
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.
Scattered thunderstorms developed over Utah on July 20, but only one severe thunderstorm wind gust was recorded.
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 20, 2:11 PM MST, 1 hour 19 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
311 PM MDT SUN JUL 20 2014
.SYNOPSIS...A WEAK SYSTEM WILL EXIT NORTHERN UTAH THIS EVENING. A
DRIER SOUTHWEST FLOW WILL FOLLOW FOR TOMORROW AND TUESDAY.
MOISTURE WILL INCREASE FROM THE SOUTH AGAIN ON WEDNESDAY.
&&
.DISCUSSION...UPPER RIDGE REMAINS CENTERED OVER SOUTHERN NEW
MEXICO THIS AFTERNOON WITH A WEAK CLOSED LOW OFF THE SOUTHERN
CALIFORNIA COAST. FIRST WEAK SHORT WAVE HAS PUSHED INITIAL BAND OF
SHOWERS TO THE NORTHERN FRINGES OF THE STATE. SECONDARY FEATURE IS
ALLOWING SHOWERS AND THUNDERSTORMS TO DEVELOP ACROSS CENTRAL AND
SOUTHEAST PORTION OF THE STATE. THESE SHOWERS WILL CONTINUE TO
DRIFT NORTH THROUGH THE AFTERNOON AND EVENING. AIRMASS BEGINNING
TO DRY FROM THE SOUTHWEST AND THIS TREND WILL CONTINUE INTO
MONDAY. EXPECT ONLY A FEW DROPS OF RAIN AND PLENTY OF VIRGA OVER
THE NORTH WITH A MODEST INCREASE THIS EVENING. EXPECT MORE
WIDESPREAD CONVECTION ACROSS THE EASTERN AND SOUTHEASTERN PORTION
OF THE AREA. A FEW WEAK CELLS COULD STILL FORM ACROSS THE
SOUTHWEST...BUT THE CHANCES ARE SMALL.
MODEL DATA NOW SUGGEST THAT WINDS WILL BE A BIT LIGHTER ON
MONDAY...AND THE FIRE WEATHER WATCH HAS BEEN CANCELLED. A WATCH
FOR TUESDAY HAS BEEN ISSUED...SEE FIRE WEATHER BELOW.
THE MEAN UPPER HIGH REMAINS IN PLACE THROUGH AT LEAST WEDNESDAY.
THE DRIER SOUTHWESTERLY FLOW FOR MONDAY AND TUESDAY WILL PRECEDE A
BRIEF MOISTURE SURGE EXPECTED TO ARRIVE LATER WEDNESDAY. NEW
MODELS SEEM TO BE IN BETTER AGREEMENT THAT A TROUGH DRIFTS ACROSS
THE NORTHERN ROCKIES AND FLATTEN THE RIDGE...BUT ONLY MARGINALLY.
COULD SEE ISOLATED TO WIDELY SCATTERED CONVECTION ALONG THE SPINE
OF UTAH WEDNESDAY DECREASING AS THE WEEK PROGRESSES. RIDGE WILL
PUMP UP IN EARNEST INTO THE WEEKEND AS IT REDEVELOPS OVER NEVADA.
THIS WILL ESSENTIALLY SHUT OFF THE MOISTURE TAP.
&&
.AVIATION...NORTH TO NORTHWESTERLY WINDS WILL CONTINUE AT THE SLC
TERMINAL THROUGH 02-04Z. SHOWERS AND AN OCCASIONAL THUNDERSTORM WILL
CONTINUE TO MOVE THROUGH THE AREA. GUSTY AND ERRATIC WINDS ARE
POSSIBLE NEAR ANY SHOWERS AND THUNDERSTORMS THROUGH 02Z OR SO.
&&
.FIRE WEATHER...SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS
CENTRAL AND NORTHERN UTAH INTO THIS EVENING. MOST STORMS WILL BE
ACCOMPANIED BY WETTING RAIN. WINDS WILL BE GUSTY AND ERRATIC IN THE
VICINITY OF STORMS. DRIER AIR WILL MOVE INTO UTAH FROM THE SOUTH
MONDAY INTO TUESDAY. SOUTHWEST WINDS WILL GRADUALLY INCREASE THROUGH
TUESDAY AS A DISTURBANCE MOVES INTO THE PACIFIC NORTHWEST. WINDS
TOMORROW AFTERNOON ARE EXPECTED TO REMAIN JUST BELOW RED FLAG
CRITERIA...BUT BY TUESDAY AFTERNOON EXPECT THAT PORTIONS OF WESTERN
UTAH WILL SEE WINDS GUSTING TO AROUND 30 MPH. BECAUSE WINDS LOOK
JUST BELOW CRITERIA MONDAY AFTERNOON...DROPPED FIRE WEATHER WATCH
FOR MONDAY AFTERNOON...BUT LEFT IT IN PLACE FOR TUESDAY ACROSS
WESTERN UTAH. DID NOT UPGRADE IT TO A WARNING BECAUSE CONFIDENCE IS
STILL NOT HIGH ENOUGH THAT WINDS WILL BE SUFFICIENTLY STRONG ON
TUESDAY.
MOISTURE WILL INCREASE ACROSS SOUTHERN AND CENTRAL UTAH
WEDNESDAY...RESULTING IN AN INCREASE IN CONVECTION ACROSS THE HIGHER
TERRAIN. THIS MOISTURE WILL BE PUSHED SOUTHWARD LATER NEXT WEEK AS
ANOTHER DISTURBANCE CROSSING TO THE NORTH OF THE STATE SENDS DRY AIR
INTO NORTHERN UTAH.
&&
.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FIRE WEATHER WATCH FROM TUESDAY AFTERNOON THROUGH TUESDAY
EVENING FOR UTZ478-492-495.
WY...NONE.
&&
PUBLIC.........YOUNG
FIRE WEATHER...KRUSE
AVIATION.......HOSENFELD
FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)
FOR FREQUENTLY ASKED QUESTIONS ABOUT THE AREA FORECAST DISCUSSION
VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY/GENERAL/AFD_FAQS.PHP (ALL LOWER CASE)HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SALT LAKE CITY UT 559 AM MDT SUN JUL 20 2014 UTZ001>016-019>021-517-518-WYZ021-211200- 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- 559 AM MDT SUN JUL 20 2014 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 ACROSS MUCH OF THE OUTLOOK AREA TODAY...MOST NUMEROUS OVER CENTRAL AND NORTHERN PORTIONS. SOME OF THESE WILL LINGER INTO THIS EVENING ACROSS THE NORTH. THE PRIMARY THREAT FROM THESE STORMS WILL BE STRONG GUSTY WINDS AND LIGHTNING. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A DRY SOUTHWEST FLOW WILL SET UP ON MONDAY AND CONTINUE THROUGH TUESDAY. CRITICAL FIRE WEATHER CONDITIONS COULD DEVELOP ACROSS MAINLY THE WESTERN OUTLOOK AREA FROM THE COMBINATION OF GUSTY SOUTH WINDS AND LOW HUMIDITY. SOME MOISTURE COULD RETURN TO THE AREA WEDNESDAY BRINGING A RENEWED THREAT OF SHOWERS AND THUNDERSTORMS. THE MOISTURE COULD PERSIST ACROSS THE SOUTH THURSDAY THROUGH THE REST OF THE WEEK WHILE THE NORTH DRIES AGAIN. .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/ (ALL LOWER CASE) 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 350 PM MDT SUN JUL 20 2014 UTZ006-009-010-202230- WASATCH MOUNTAIN VALLEYS UT-WESTERN UINTA MOUNTAINS UT- WASATCH PLATEAU/BOOK CLIFFS UT- 350 PM MDT SUN JUL 20 2014 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL SUMMIT... NORTHWESTERN DUCHESNE...NORTHEASTERN WASATCH AND NORTHEASTERN UTAH COUNTIES UNTIL 430 PM MDT... AT 349 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 11 MILES SOUTH OF TIMBER LAKES...OR 16 MILES SOUTHEAST OF HEBER CITY...MOVING NORTH AT 35 MPH. HALF INCH HAIL AND WINDS OF 40 TO 55 MPH WILL BE POSSIBLE. LOCATIONS IMPACTED INCLUDE... TIMBER LAKES...SAMAK...TRIAL LAKE AND WOODLAND. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF THREATENING WEATHER APPROACHES...TAKE SHELTER IN A STURDY BUILDING. && LAT...LON 4020 11112 4027 11134 4081 11113 4071 11074 TIME...MOT...LOC 2149Z 201DEG 31KT 4031 11120 CRK
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
358 PM MDT SUN JUL 20 2014
UTZ006-009-WYZ021-202245-
WASATCH MOUNTAIN VALLEYS UT-WESTERN UINTA MOUNTAINS UT-
SOUTHWEST WYOMING WY-
358 PM MDT SUN JUL 20 2014
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN SUMMIT...NORTH CENTRAL
WASATCH AND SOUTHWESTERN UINTA COUNTIES UNTIL 445 PM MDT...
AT 358 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR OAKLEY...OR 8 MILES NORTHEAST OF PARK
CITY...MOVING NORTHEAST AT 40 MPH.
HALF INCH HAIL AND WINDS OF 40 TO 55 MPH WILL BE POSSIBLE.
LOCATIONS IMPACTED INCLUDE...
COALVILLE...KAMAS...OAKLEY...WANSHIP...NORTH SNYDERVILLE BASIN...
SAMAK...ROCKPORT RESERVOIR...MARION...HOYTSVILLE AND PEOA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF THREATENING WEATHER APPROACHES...TAKE SHELTER IN A STURDY
BUILDING.
&&
LAT...LON 4060 11137 4077 11152 4083 11142 4088 11142
4090 11141 4121 11100 4083 11068
TIME...MOT...LOC 2158Z 235DEG 34KT 4072 11136
CRKThe Salt Lake City radar (KMTX), 63 km away, was scanning. The volume nearest the first event began at 22:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
The Great Salt Lake Marina sensor recorded a peak wind gust of 59 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2014Every state in 2014This day in weather historyWarnings in Utah, July 2014
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: 537592.