Alert archive / Utah / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 49, NWS Salt Lake City, UT

July 20, 1998Iron County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 20, 1998, 6:53 PM MDT for Iron County, Utah. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jul 20, 1998, 6:53 PM MDT (00:53 UTC)
Expired: Jul 20, 1998, 7:35 PM MDT
In force: 42 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Iron County, UT

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 0.9 hours before the alert went out and 285 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 534 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1738 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

959 
WUUS1 KSLC 210054 RRA
SVRSLC
UTC021-210135-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
653 PM MDT MON JUL 20 1998

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

   * SEVERE THUNDERSTORM WARNING FOR...
     SOUTH CENTRAL IRON COUNTY IN UTAH
     INCLUDING CEDAR CITY

   * UNTIL 735 PM MDT

   * AT 647 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
     SEVERE THUNDERSTORM 5 MILES SOUTHEAST OF CEDAR CITY...
     STATIONARY.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN SALT LAKE CITY.

LAT...LON 3750 11295 3766 11285 3777 11308 3757 11320

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

Local storm report, Jul 20, 1:32 PM MDT, 5 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  SALT LAKE CITY UT
130 PM MDT MON JUN 20 1998

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

10845 PM    WENDOVER                 UT     70 MPH TSTM GUST
07/19/98   TOOELE

1900 PM    36 E OF WENDOVER         UT     65 MPH TSTM GUST
07/19/98   TOOELE                          (ESTIMATED)

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 2:15 PM MDT	Severe Thunderstorm Warning	SLC	San Juan	45 min
Jul 21, 3:07 PM MDT	Severe Thunderstorm Warning	SLC	Kane, Washington	38 min
Jul 21, 3:30 PM MDT	Flash Flood Warning	SLC	Washington	2 hr
Jul 21, 4:50 PM MDT	Flash Flood Warning	SLC	Washington	3 hr
Jul 21, 5:10 PM MDT	Severe Thunderstorm Warning	SLC	Washington	50 min
Jul 21, 5:41 PM MDT	Flash Flood Warning	SLC	Washington	3 hr

Nearby

Severe Thunderstorm Warnings in Utah, 1998 Every severe thunderstorm warning in 1998

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.