Alert archive / Utah / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 678

September 8, 200216 counties in Utah

The Storm Prediction Center issued this severe thunderstorm watch at Sep 8, 2002, 1:30 PM MDT for 16 counties in Utah. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Sep 8, 2002, 1:30 PM MDT (19:30 UTC)
Expired
Sep 8, 2002, 9:00 PM MDT
In force
8 hr
Issued by
the Storm Prediction Center

Counties Beaver County, UT, Carbon County, UT, Duchesne County, UT, Emery County, UT, Garfield County, UT, Iron County, UT, Juab County, UT, Kane County, UT, Millard County, UT, Piute County, UT, Sanpete County, UT, Sevier County, UT, Utah County, UT, Wasatch County, UT, Washington County, UT, Wayne County, UT

The radar

The Cedar City radar (KICX), 83 km from the middle of the area, began a volume at 19:34 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.

Warnings issued inside it

5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Sep 8, 1:58 PM MDTTornado WarningSLCSanpete32 min
Sep 8, 2:34 PM MDTSevere Thunderstorm WarningSLCKane, San Juan26 min
Sep 8, 3:00 PM MDTSevere Thunderstorm WarningSLCKane, San Juan45 min
Sep 8, 3:51 PM MDTSevere Thunderstorm WarningSLCKane, San Juan39 min
Sep 8, 5:07 PM MDTSevere Thunderstorm WarningSLCEmery23 min

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 7.5 hours before the alert went out and 288 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 12:00Z on 2002-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 238 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 12:00Z on 2002-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.1939587897117Sfc1 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
238 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
957 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

Nearby

Severe Thunderstorm Watches in Utah, 2002Every severe thunderstorm watch in 2002

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.