Alert archive / Utah / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 102, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 12, 1998, 2:19 PM MDT for San Juan County, Utah. It was in force for 26 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Sep 12, 1998, 2:19 PM MDT (20:19 UTC)
- Expired
- Sep 12, 1998, 2:45 PM MDT
- In force
- 26 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Whole counties
County San Juan County, UT
The radar
The Grand Junction radar (KGJX), 212 km from the middle of the area, began a volume at 20:19 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 12, 2:30 PM MDT | Thunderstorm Wind 61 | (4bl)Blanding Muni A, UT |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 8.3 hours before the alert went out and 202 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
- 67 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 673 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 101 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
344
WUUS1 KSLC 122021 RRA
SVRSLC
UTC037-122045-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
219 PM MDT SAT SEP 12 1998
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EAST CENTRAL SAN JUAN COUNTY IN UTAH
INCLUDING BLANDING
* UNTIL 245 PM MDT
* AT 209 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 4 MILES SOUTHEAST OF BLANDING...MOVING
NORTHEAST AT 30 MILES PER HOUR.
* OTHER LOCATIONS IN THE WARNING INCLUDE EASTLAND
LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
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 3773 10958 3746 10934 3757 10905 3792 10907The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 11:43 AM MDT | Severe Thunderstorm Warning | SLC | San Juan | 17 min |
| Sep 12, 2:29 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Salt Lake | 41 min |
| Sep 12, 2:42 PM MDT | Severe Thunderstorm Warning | SLC | San Juan | 18 min |
| Sep 12, 3:02 PM MDT | Severe Thunderstorm Warning | SLC | Utah | 38 min |
| Sep 12, 3:31 PM MDT | Severe Thunderstorm Warning | SLC | Summit | 39 min |
| Sep 12, 3:34 PM MDT | Severe Thunderstorm Warning | SLC | Utah | 41 min |
| Sep 12, 5:10 PM MDT | Tornado Warning | SLC | Davis, Weber | 35 min |
| Sep 12, 5:35 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Weber | 40 min |
Nearby
Severe Thunderstorm Warnings in Utah, 1998Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.