Alert archive / Idaho / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 113, NWS Salt Lake City, UT

September 11, 1997Bear Lake County, Idaho

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 11, 1997, 4:42 PM MDT for Bear Lake County, Idaho. It was in force for 28 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, 4:42 PM MDT (22:42 UTC)
Expired
Sep 11, 1997, 5:10 PM MDT
In force
28 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Bear Lake County, ID

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 11, 1:45 PM MDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 10.7 hours before the alert went out and 174 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, Salt Lake City I, UT at 12:00Z on 1997-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 262 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 1997-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 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
262 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
2379 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSLC 112242 RRA
SVRSLC
IDC007-112310-

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

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 510 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHEASTERN IDAHO

   ...SOUTHERN BEAR LAKE COUNTY
 
AT 439 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR OVER EXTREME SOUTHEAST FRANKLIN COUNTY.  MOVEMENT OF THIS
STORM WAS EAST NORTHEAST AT 40-45 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
FISH HAVEN             AT AROUND 450 PM MDT
ST CHARLES             AT AROUND 450 PM MDT
MONTPELIER       V      AT AROUND 505 PM MDT
 
THIS THUNDERSTORM MAY PRODUCE STRONG GUSTY WIND...LARGE HAIL...AND
FREQUENT LIGHTNING.  TAKE COVER WHEN THREATENING WEATHER APPROACHES.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 11, 2:38 PM MDTSevere Thunderstorm WarningSLCFranklin47 min
Sep 11, 4:16 PM MDTSevere Thunderstorm WarningSLCFranklin34 min

Nearby

Severe Thunderstorm Warnings in Idaho, 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.