Alert archive / Utah / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 55, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 12, 2002, 3:28 PM MDT for Garfield County, Kane County, Utah. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 12, 2002, 3:28 PM MDT (21:28 UTC)
- Expired
- Sep 12, 2002, 4:15 PM MDT
- In force
- 47 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Counties, with a storm outline in the text
Counties Garfield County, UT, Kane County, UT
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.5 hours before the alert went out and 260 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1201 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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.
NWS Salt Lake City, UT wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 12, 10:40 AM MDT, 4 hours 48 minutes earlier.
Area forecast discussion, Sep 12, 10:40 AM MDT, 4 hours 48 minutes before
UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1040 AM MDT THU SEP 12 2002
.SYNOPSIS...AN UPPER LOW WILL SLOWLY MOVE THROUGH THE AREA TODAY
AND INTO THE PLAINS ON FRIDAY. DEEP MOISTURE WILL REMAIN OVER THE
AREA THROUGH TONIGHT WITH DRYING FROM THE NORTHWEST ON FRIDAY.
.DISCUSSION...VERY MOIST AIRMASS OVER UTAH. UPPER LOW CIRCULATION
CENTERED JUST WEST OF PRICE PER RADAR MOSAIC. LOW TOPPED HEAVY RAIN
PRODUCING STORMS NEAR MILFORD AND FILLMORE. ONE RAWS PICKED UP .60
IN ONE HOUR NEAR FILLMORE THIS MORNING. ISSUED A FLASH FLOOD WATCH
MOST OF SOUTHERN PORTIONS OF THE CWA AND EXTENDING NORTH TO COVER
THE RECENT BURN AREAS IN UTAH COUNTY. NO FURTHER UPDATES PLANNED
THIS MORNING.
SLC 642 CDC 641 GIBSON
.SLC...FFASLC...FLASH FLOOD WATCH SOUTHWEST AND WEST-CENTRAL UTAH
UNTIL 1000 PM.The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 12:23 PM MDT | Tornado Warning | SLC | Sanpete | 7 min |
| Sep 12, 1:41 PM MDT | Flash Flood Warning | SLC | Emery, Sevier | 64 min |
| Sep 12, 2:17 PM MDT | Flash Flood Warning | SLC | Garfield | 118 min |
| Sep 12, 2:25 PM MDT | Flash Flood Warning | SLC | Kane | 2 hr |
| Sep 12, 3:08 PM MDT | Flash Flood Warning | SLC | Emery, Garfield, Kane, Wayne | 112 min |
| Sep 12, 4:24 PM MDT | Tornado Warning | SLC | Carbon | 36 min |
| Sep 12, 4:24 PM MDT | Tornado Warning | SLC | Carbon | 36 min |
| Sep 12, 4:50 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 25 min |
| Sep 12, 4:52 PM MDT | Flash Flood Warning | SLC | Carbon, Emery | 113 min |
| Sep 12, 5:07 PM MDT | Flash Flood Warning | SLC | Carbon, Emery | 98 min |
Nearby
Severe Thunderstorm Warnings in Utah, 2002Every severe thunderstorm warning 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.