Alert archive / Utah / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 64, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 4, 2011, 3:41 PM MDT for Utah County, Utah. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2011, 3:41 PM MDT (21:41 UTC)
- Expired
- Aug 4, 2011, 4:45 PM MDT
- In force
- 64 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
County Utah County, UT
The radar
The Salt Lake City radar (KMTX), 123 km from the middle of the area, began a volume at 21:45 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, 9.7 hours before the alert went out and 54 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
- 228 J/kg
- Mixed-layer CIN
- -245 J/kg
- Mixed-layer LCL
- 1745 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
444
WUUS55 KSLC 042141
SVRSLC
UTC049-042245-
/O.NEW.KSLC.SV.W.0064.110804T2141Z-110804T2245Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
341 PM MDT THU AUG 4 2011
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL UTAH COUNTY IN UTAH
* UNTIL 445 PM MDT
* AT 336 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 8 MILES
WEST OF OREM...OR 9 MILES WEST OF PROVO...MOVING NORTHEAST AT 15
MPH. A SEPERATE STORM NEAR KEARNS ALREADY PRODUCED PING PONG SIZE
HAIL.
* LOCATIONS IN THE WARNING INCLUDE...
AMERICAN FORK... PROVO... OREM... LINDON... PLEASANT GROVE... MT
TIMPANOGOS AND SUNDANCE
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 4016 11184 4032 11196 4050 11158 4045 11161
4042 11158 4036 11156 4034 11145 4030 11145
TIME...MOT...LOC 2140Z 240DEG 12KT 4027 11182
$$
ROGOWSKI3 follow-up statements
266
WWUS55 KSLC 042151
SVSSLC
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
351 PM MDT THU AUG 4 2011
UTC049-042245-
/O.CON.KSLC.SV.W.0064.000000T0000Z-110804T2245Z/
UTAH UT-
351 PM MDT THU AUG 4 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MDT
FOR NORTH CENTRAL UTAH COUNTY...
AT 345 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR LINDON...OR ABOUT 8 MILES NORTHWEST OF PROVO...MOVING
NORTHEAST AT 40 MPH. AT 330 PM...A SIMILAR STORM HAD PING PONG SIZE
HAIL IN KEARNS.
* LOCATIONS IN THE WARNING INCLUDE...
INTERSTATE 15 FROM AMERICAN FORK TO PROVO
MT TIMPANOGOS AND SUNDANCE
LAT...LON 4016 11184 4036 11186 4050 11158 4046 11161
4042 11158 4036 11156 4034 11145 4030 11145
TIME...MOT...LOC 2150Z 234DEG 36KT 4035 11173
$$
ROGOWSKI846
WWUS55 KSLC 042227
SVSSLC
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
427 PM MDT THU AUG 4 2011
UTC049-042245-
/O.CON.KSLC.SV.W.0064.000000T0000Z-110804T2245Z/
UTAH UT-
427 PM MDT THU AUG 4 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MDT
FOR NORTH CENTRAL UTAH COUNTY...
AT 424 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR MT TIMPANOGOS...OR ABOUT 10 MILES NORTH OF PROVO...
MOVING NORTHEAST AT 20 MPH.
* LOCATIONS IN THE WARNING INCLUDE...
RURAL NORTHERN UTAH COUNTY
LAT...LON 4034 11171 4040 11177 4050 11158 4045 11161
4043 11159 4042 11158 4036 11156
TIME...MOT...LOC 2227Z 229DEG 16KT 4040 11166
$$
ROGOWSKI581
WWUS55 KSLC 042238
SVSSLC
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
438 PM MDT THU AUG 4 2011
UTC049-042248-
/O.EXP.KSLC.SV.W.0064.000000T0000Z-110804T2245Z/
UTAH UT-
438 PM MDT THU AUG 4 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL UTAH COUNTY WILL
EXPIRE AT 445 PM MDT...
THE STORM HAS WEAKENED AND IS NO LONGER SEVERE. THEREFORE THE WARNING
HAS BEEN ALLOWED TO EXPIRE.
LAT...LON 4034 11171 4040 11177 4050 11158 4045 11161
4043 11159 4042 11158 4036 11156
TIME...MOT...LOC 2238Z 229DEG 16KT 4043 11161
$$
ROGOWSKIThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 6:26 PM MDT | Special Weather Statement | SLC | Piute | 34 min |
| Aug 3, 8:54 PM MDT | Special Weather Statement | SLC | Piute | 21 min |
| Aug 3, 10:26 PM MDT | Flash Flood Warning | SLC | Piute, Sevier | 3 hr |
| Aug 4, 2:31 PM MDT | Severe Thunderstorm Warning | SLC | Juab, Utah | 29 min |
| Aug 4, 3:14 PM MDT | Flash Flood Warning | SLC | Piute | 3 hr |
| Aug 4, 3:27 PM MDT | Severe Thunderstorm Warning | SLC | Salt Lake | 32 min |
| Aug 4, 3:28 PM MDT | Flash Flood Warning | SLC | Wayne | 4 hr |
| Aug 4, 3:31 PM MDT | Severe Thunderstorm Warning | SLC | Duchesne | 59 min |
| Aug 4, 3:44 PM MDT | Flash Flood Warning | SLC | Garfield, Piute | 117 min |
| Aug 4, 3:58 PM MDT | Flash Flood Warning | SLC | Wayne | 2 hr |
| Aug 4, 4:07 PM MDT | Severe Thunderstorm Warning | SLC | Salt Lake, Utah | 38 min |
| Aug 4, 4:11 PM MDT | Severe Thunderstorm Warning | SLC | Duchesne, Wasatch | 36 min |
| Aug 4, 4:43 PM MDT | Severe Thunderstorm Warning | SLC | Juab | 62 min |
| Aug 4, 4:56 PM MDT | Severe Thunderstorm Warning | SLC | Emery | 34 min |
| Aug 4, 5:27 PM MDT | Severe Thunderstorm Warning | SLC | Utah | 63 min |
Nearby
Severe Thunderstorm Warnings in Utah, 2011Every severe thunderstorm warning in 2011
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.