Alert archive / Utah / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 682
The Storm Prediction Center issued this severe thunderstorm watch at Sep 16, 2002, 8:20 AM MDT for 19 counties in Utah. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 16, 2002, 8:20 AM MDT (14:20 UTC)
- Expired
- Sep 16, 2002, 3:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
Counties Beaver County, UT, Box Elder County, UT, Cache County, UT, Davis County, UT, Garfield County, UT, Iron County, UT, Juab County, UT, Kane County, UT, Millard County, UT, Morgan County, UT, Piute County, UT, Rich County, UT, Salt Lake County, UT, Sanpete County, UT, Sevier County, UT, Tooele County, UT, Utah County, UT, Washington County, UT, Weber County, UT
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 11:02 AM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Davis, Tooele, Weber | 43 min |
| Sep 16, 11:42 AM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Cache, Davis, Morgan, Salt Lake, Tooele and 1 more | 48 min |
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 12:00Z, 2.3 hours before the alert went out and 210 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
- 2960 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 161422 SEL2 SPC WW 161420 UTZ000-162100- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 682 STORM PREDICTION CENTER NORMAN OK 820 AM MDT MON SEP 16 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF WESTERN UTAH EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 820 AM UNTIL 300 PM MDT. HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES EAST OF SAINT GEORGE UTAH TO 60 MILES NORTH NORTHWEST OF OGDEN UTAH. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. DISCUSSION...UPPER LEVEL LOW LOCATED OVER CENTRAL NV WITH 60 KT WIND MAX WILL MOVE ENEWD ACROSS WRN UT TODAY. STRONG DYNAMICS ASSOCIATED WITH THIS SYSTEM...PLUS A DRY BOUNDARY LAYER AND DIURNAL HEATING SHOULD BE SUFFICIENT FOR STORMS TO PRODUCE DAMAGING WINDS. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 0.5 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 21050. ...IMY 415,1110 370,1113 370,1140 415,1134
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 2:45 PM MDT | Severe Thunderstorm Watch | SPC | Beaver, Carbon, Daggett, Duchesne, Emery, Piute and 6 more | 5 hr |
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.