Alert archive / Idaho / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 91, NWS Pocatello, ID

September 11, 1997Cassia County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Sep 11, 1997, 12:54 PM MDT for Cassia County, Idaho. It was in force for 66 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 11, 1997, 12:54 PM MDT (18:54 UTC)
Expired
Sep 11, 1997, 2:00 PM MDT
In force
66 min
Issued by
NWS Pocatello, ID
Area
Whole counties

County Cassia County, ID

What was reported inside it

TimeReportWhereRemark
Sep 11, 2:05 PM MDTHail 0.75Sublett, ID

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

Elko, NV (KLKN), launched 12:00Z, 6.9 hours before the alert went out and 165 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, Elko, NV at 12:00Z on 1997-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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, Elko, NV at 12:00Z on 1997-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -38 square meters per square second.19395878Sfc1 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
3 J/kg
Mixed-layer CIN
-296 J/kg
Mixed-layer LCL
1728 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
-38 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

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pocatello, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 11, 9:09 AM MDT, 3 hours 45 minutes earlier.

Area forecast discussion, Sep 11, 9:09 AM MDT, 3 hours 45 minutes before
EASTERN IDAHO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
900 AM MDT THU SEP 11 1997

KSFX 88D/OBS INDICATING TSTMS IN THE VICINITY OF IDA AND ALONG THE
DIVIDE...MOVING NORTHEAST AND SHORTLY BEYOND THE CWA.  HOWEVER
DYNAMICS ARE CONTINUING TO DEVELOP FOR STRONG TO SEVERE CONVECTIVE
EPISODE LATER TODAY.  PASSAGE OF FRONT NOW OVER WESTERN IDAHO THROUGH
A MOIST AND UNSTABLE AIR MASS.  FRONT ASSOCIATED WITH...PV MAX...H3
JET...DIFLUENCE ALOFT AND CAA ALOFT.  STRONG STORMS STILL SUPPORTED BY
NEW ETA RUN AND ITS INDICATORS OF A HIGH CAPE ENVIRONMENT...RICH H7/H5
THETA-E ADVECTION...AND MODEST H8-H4 SHEAR THROUGH FRONTAL PASSAGE OF
MID AFTERNOON.  CURRENT ZONE PACKAGE HAS UNFOLDING SCENARIO WELL
COVERED AND NO UPDATES ARE CURRENTLY NEEDED.  TSC
.WSR88D KSFX...VCP21 OPERATIONAL.

IDA TB 074/045 072/040 075 04520
PIH TB 076/048 075/044 077 04520

The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 10, 6:59 PM MDTSevere Thunderstorm WarningPIHPower61 min
Sep 10, 7:27 PM MDTFlash Flood WarningPIHBannock48 min
Sep 10, 7:27 PM MDTSevere Thunderstorm WarningPIHBannock48 min
Sep 10, 9:30 PM MDTSevere Thunderstorm WarningPIHMadison, Teton45 min
Sep 11, 4:37 AM MDTSevere Thunderstorm WarningPIHBingham, Power53 min
Sep 11, 5:04 AM MDTSevere Thunderstorm WarningPIHBannock26 min
Sep 11, 5:26 AM MDTSevere Thunderstorm WarningPIHBingham34 min
Sep 11, 12:54 PM MDTFlash Flood WarningPIHCassia66 min
Sep 11, 1:41 PM MDTSevere Thunderstorm WarningPIHButte64 min
Sep 11, 2:00 PM MDTSevere Thunderstorm WarningPIHPower45 min
Sep 11, 2:24 PM MDTSevere Thunderstorm WarningPIHBannock, Bingham, Caribou66 min
Sep 11, 2:30 PM MDTSevere Thunderstorm WarningPIHBlaine60 min
Sep 11, 2:36 PM MDTFlash Flood WarningPIHBannock, Bingham2 hr
Sep 11, 2:36 PM MDTSevere Thunderstorm WarningPIHBannock, Bingham2 hr
Sep 11, 2:47 PM MDTSevere Thunderstorm WarningPIHBingham, Blaine, Butte58 min
Sep 11, 3:16 PM MDTFlash Flood WarningPIHBonneville, Madison59 min
Sep 11, 3:16 PM MDTSevere Thunderstorm WarningPIHBonneville, Madison59 min
Sep 11, 3:25 PM MDTSevere Thunderstorm WarningPIHJefferson35 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.