Alert archive / Utah / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 8, NWS Salt Lake City, UT

August 11, 1990Box Elder County, Tooele County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 11, 1990, 7:00 PM MDT for Box Elder County, Tooele County, Utah. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 11, 1990, 7:00 PM MDT (01:00 UTC)
Expired
Aug 11, 1990, 9:00 PM MDT
In force
2 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Box Elder County, UT, Tooele 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, 1.0 hours before the alert went out and 104 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.

Skew-T log-pSkew-T log-p diagram, Salt Lake City I, UT at 00:00Z on 1990-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 127 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 00:00Z on 1990-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
127 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
3131 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
43 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What 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 11, 3:24 PM MDT, 3 hours 36 minutes before
UTZ001-003-010-120030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
321 PM MDT SAT AUG 11 1990

A MOIST AND UNSTABLE AIRMASS CONTINUES TO DOMINATE UTAHS WEATHER THIS
AFTERNOON.  RADAR AND SATELLITE PICTURES SHOW A COUPLE OF AREAS OF
RAPID THUNDERSTORM DEVELOPMENT OVER NORTHWEST UTAH.

ONE OF THESE AREAS WAS LOCATED ALONG THE UTAH/IDAHO BORDER NEAR
INTERSTATE 15.  SPOTTERS IN THE NORTHWEST HAVE REPORTED GUSTY WINDS ANSMALL HAIL WITH THIS STORM.  PERSONS ENGAGED IN OUTDOOR ACTIVITIES IN
EASTERN BOX ELDER AND CACHE COUNTIES SHOULD KEEP A WEATHER EYE OUT FOR
THESE STORMS AS THEY MOVE INTO THE AREA.

ANOTHER AREA OF RAPID THUNDERSTORM DEVELOPMENT WAS IN SOUTHERN *SALT
LAKE COUNTY.  FREQUENT LIGHTNING WAS REPORTED WITH THIS STORM.

STRONG GUSTY WINDS... SMALL HAIL... FREQUENT LIGHTNING AND BRIEF
HEAVY RAINFALL COULD OCCUR IN THESE LOCATIONS DURING THE NEXT COUPLE
OF HOURS.

DMC...2120Z
Special weather statement, Aug 11, 3:26 PM MDT, 3 hours 34 minutes before
UTZ001-003-010-120030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
321 PM MDT SAT AUG 11 1990

A MOIST AND UNSTABLE AIRMASS CONTINUES TO DOMINATE UTAHS WEATHER THIS
AFTERNOON.  RADAR AND SATELLITE PICTURES SHOW A COUPLE OF AREAS OF
RAPID THUNDERSTORM DEVELOPMENT OVER NORTHWEST UTAH.

ONE OF THESE AREAS WAS LOCATED ALONG THE UTAH/IDAHO BORDER NEAR
INTERSTATE 15. SPOTTERS IN THE NORTHWEST HAVE REPORTED GUSTY WINDS AND
SMALL HAIL WITH THIS STORM. PERSONS ENGAGED IN OUTDOOR ACTIVITIES IN
EASTERN BOX ELDER AND CACHE COUNTIES SHOULD KEEP A WEATHER EYE OUT FOR
THESE STORMS AS THEY MOVE INTO THE AREA.

ANOTHER AREA OF RAPID THUNDERSTORM DEVELOPMENT WAS IN SOUTHERN 1SALT
LAKE COUNTY.  FREQUENT LIGHTNING WAS REPORTED WITH THIS STORM.

STRONG GUSTY WINDS... SMALL HAIL... FREQUENT LIGHTNING AND BRIEF
HEAVY RAINFALL COULD OCCUR IN THESE LOCATIONS DURING THE NEXT COUPLE
OF HOURS.

DMC...2120Z
Special weather statement, Aug 11, 6:12 PM MDT, 48 minutes before
UTZ001-002-003-010-011-120400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
615 PM MDT SAT AUG 11 1990

A MOIST AND UNSTABLE AIRMASS CONTINUES TO DOMINATE UTAHS WEATHER THIS
EVENING.  RADAR AND SATELLITE PICTURES SHOW SCATTERED AREAS OF
THUNDERSTORM CONTINUING OVER THE STATE.

SPOTTERS HAVE REPORTED SOME BRIEF LOCAL HEAVY RAIN.. STRONG WINDS AND
SMALL HAIL. THE MOST ACTIVE AREA AT 6 PM WAS IN THE NORTHERN THIRD OF
THE STATE BUT THERE STILL WERE A FEW IN OTHER AREAS.

STRONG GUSTY WINDS... SMALL HAIL... FREQUENT LIGHTNING AND BRIEF
HEAVY RAINFALL COULD OCCUR YET THE NEXT FEW HOURS.. ESPECIALLY IN THE
NORTH. ACTIVITY SHOULD GENERALLY DECREASE SLOWLY DURING THE NIGHT.

DJ...0009Z

Nearby

Severe Thunderstorm Warnings in Utah, 1990Every severe thunderstorm warning in 1990

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.