Alert archive / Utah / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 13, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 15, 1987, 6:02 PM MDT for Wasatch County, Utah. It was in force for 58 min.
The area
The counties it named.
The facts
- Issued
- Aug 15, 1987, 6:02 PM MDT (00:02 UTC)
- Expired
- Aug 15, 1987, 7:00 PM MDT
- In force
- 58 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Whole counties
County Wasatch County, UT
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 00:00Z, 0.0 hours before the alert went out and 80 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 46 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 2049 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSLC 160002 RRA
SVRSLC
UTC051-160100-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
602 PM MDT SAT AUG 15 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 700 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN CENTRAL UTAH
...WESTERN WASATCH
THE HIGHWAY PATROL REPORTED UP TO THREE-QUARTER INCH HAIL FROM A
LARGE THUNDERSTORM AT 545PM. THIS THUNDERSTORM WILL MOVE THROUGH
WESTERN WASATCH COUNTY DURING THE NEXT HOUR.
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IQN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
FURTHER STATEMENTS WILL BE ISSUED AS NECESSARY
ERC 16/0005ZWhat forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Aug 15, 12:32 PM MDT, 5 hours 30 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY
1230 PM MDT SAT AUG 15 1987
...STRONG THUNDERSTORMS DEVELOPING OVER NORTHERN UTAH...
STRONG THUNDERSTORMS DEVELOPED RAPIDLY OVER PORTIONS OF NORTHERN
UTAH EARLY THIS AFTERNOON. THE STRONGEST THUNDERSTORMS AT 1215 PM WERE
FROM THE WASATCH FRONT EASTWARD AND NORTH OF A LINE FROM ABOUT PROVO TO
VERNAL.
SEVERAL REPORTS OF HAIL HAVE BEEN RECEIVED FROM THE SOUTH END OF THE
SALT LAKE VALLEY. MOST OF THE HAIL HAS BEEN IN THE 1/4 TO 1/2 INCH
DIAMETER RANGE. HEAVY RAINFALL HAS ALSO BEEN REPORTED.
ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP THROUGH THE AFTERNOON
HOURS. LOCALLY HEAVY SHOWERS AND HAIL ALONG WITH LOCAL MINOR ASTREET
FLOODING ARE POSSIBLE IN THE NORTHERN PORTION OF UTAH FOR THE NEXT
SEVERAL HOURS.
ADDITIONAL STATEMENTS WILL BE ISSUED AS NEEDED.
DRS 1831Z....Special weather statement, Aug 15, 4:53 PM MDT, 1 hour 9 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY 445 PM MDT SAT AUG 15 1987 ...STRONG THUNDERSTORMS LINGERING OVER PARTS OF NORTHERN UTAH... SATELLITE...RADAR...AND LIGHTNING INFORMATION STILL INDICATE A FEW AREAS OF STRONG THUNDERSTORMS LATE THIS AFTERNOON. THE MAIN AREA AT 430 PM WAS ALONG A LINE FROM ELY NEVADA TO DELTA THEN INTO MOST OF THE FOLLOWING COUNTIES...UTAH...WASATCH...AND DUCHESNE. THE MOVEMENT OF THESE THUNDERSTORMS IS FROM THE WEST SOUTHWEST AT ABOUT 15-20 MPH. WITH THE VERY UNSTABLE AIRMASS OVER MUCH OF NORTHERN UTAH...CONDITIONS REMAIN VERY FAVORABLE FOR HAIL STORMS. SEVERAL AREAS OF NORTHERN UTAH HAVE ALREADY REPORTED SIGNIFICANT HAIL TODAY. THESE THUNDERSTORMS ARE EXPECTED TO CONTINUE INTO THE EARLY EVENING BEFORE WEAKENING AND DISSIPATING. IN ADDITION TO HAIL... THERE IS STILL A THREAT OF LOCALLY HEAVY RAINFALL AND SOME GUSTY WINDS. FURTHER STATEMENTS WILL BE ISSUED AS NEEDED. ERC 15/2250Z
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 6:55 PM MDT | Severe Thunderstorm Warning | SLC | Utah | 80 min |
Nearby
Severe Thunderstorm Warnings in Utah, 1987Every severe thunderstorm warning in 1987
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.