Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 110, NWS Salt Lake City, UT

September 11, 1997Kane County, San Juan County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 11, 1997, 3:17 PM MDT for Kane County, San Juan County, Utah. It was in force for 43 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 11, 1997, 3:17 PM MDT (21:17 UTC)
Expired
Sep 11, 1997, 4:00 PM MDT
In force
43 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Kane County, UT, San Juan County, UT

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.3 hours before the alert went out and 262 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, Flgstf/Belemont, AZ at 12:00Z on 1997-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 588 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 1997-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.193958Sfc1 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
588 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1069 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSLC 112119 RRA
SVRSLC
UTC025-037-112200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
317 PM MDT THU SEP 11 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 400 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN SOUTH CENTRAL UTAH

   ...SOUTHEASTERN KANE COUNTY

IN SOUTHEASTERN UTAH

   ...SOUTHWESTERN SAN JUAN COUNTY
 
AT 310 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR 90 MILES WEST OF BLANDING OR 27 MILES SOUTHWEST OF BULLFROG
BASIN MOVING EAST AT 25 MPH.

THIS STORM IS EXPECTED TO AFFECT THE SOUTHERN END OF LAKE POWELL
FROM THE ESCALANTE RIVER SOUTH INCLUDING RAINBOW BRIDGE NATIONAL
MONUMENT.

THIS STORM IS CAPABLE OF PRODUCING 1.00 INCH DIAMETER HAIL AND
STRONG WINDS IN EXCESS OF 40 MPH.

BOATERS ON LAKE POWELL SHOULD MOVE TO SHELTER OF SMALL INLETS AS
LARGE WAVES ARE POSSIBLE IN THE MAIN CHANNEL OF THE LAKE.

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 10, 6:40 PM MDTFlash Flood WarningSLCGarfield85 min
Sep 10, 11:14 PM MDTSevere Thunderstorm WarningSLCBox Elder61 min
Sep 11, 12:33 PM MDTFlash Flood WarningSLCKane47 min
Sep 11, 1:22 PM MDTFlash Flood WarningSLCKane58 min
Sep 11, 2:02 PM MDTSevere Thunderstorm WarningSLCBox Elder48 min
Sep 11, 2:38 PM MDTSevere Thunderstorm WarningSLCCache47 min
Sep 11, 3:01 PM MDTSevere Thunderstorm WarningSLCBox Elder49 min
Sep 11, 3:46 PM MDTSevere Thunderstorm WarningSLCBox Elder44 min
Sep 11, 4:16 PM MDTSevere Thunderstorm WarningSLCCache34 min

Nearby

Severe Thunderstorm Warnings in Utah, 1997Every severe thunderstorm warning in 1997

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.