Alert archive / Utah / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 64, NWS Salt Lake City, UT

July 30, 1998Beaver County, Iron County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 30, 1998, 4:22 PM MDT for Beaver County, Iron County, Utah. It was in force for 53 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 30, 1998, 4:22 PM MDT (22:22 UTC)
Expired: Jul 30, 1998, 5:15 PM MDT
In force: 53 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Beaver County, UT, Iron County, UT

The radar

The Cedar City radar (KICX), 66 km from the middle of the area, began a volume at 22:22 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 10.4 hours before the alert went out and 298 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: 22 J/kg
Mixed-layer CIN: -357 J/kg
Mixed-layer LCL: 1900 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 75 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.

126 
WUUS1 KSLC 302225 RRA
SVRSLC
UTC001-021-302315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
422 PM MDT THU JUL 30 1998

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

   * SEVERE THUNDERSTORM WARNING FOR...
     EASTERN BEAVER COUNTY IN UTAH
     NORTHEASTERN IRON COUNTY IN UTAH
     INCLUDING BEAVER

   * UNTIL 515 PM MDT

   * AT 410 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
     SEVERE THUNDERSTORM 23 MILES SOUTH OF BEAVER...OR ABOUT 10 MILES
     NORTHEAST OF PAROWAN...MOVING NORTHEAST AT 30 MILES PER HOUR.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER 
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN 
EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

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 3801 11282 3793 11259 3832 11239 3853 11263

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 6:02 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder	43 min
Jul 29, 7:00 PM MDT	Flash Flood Warning	SLC	Sanpete	75 min
Jul 29, 7:33 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Salt Lake	42 min
Jul 29, 8:06 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Morgan, Salt Lake	39 min
Jul 30, 4:10 PM MDT	Severe Thunderstorm Warning	SLC	Duchesne, Summit, Wasatch	50 min
Jul 30, 4:32 PM MDT	Severe Thunderstorm Warning	SLC	Emery	43 min
Jul 30, 5:38 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Weber	52 min
Jul 30, 5:59 PM MDT	Severe Thunderstorm Warning	SLC	Weber	31 min

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; radar from the NEXRAD Level II archive.