Alert archive / Idaho / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 71, NWS Pocatello, ID

August 22, 1997Bannock County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Aug 22, 1997, 3:13 PM MDT for Bannock County, Idaho. It was in force for 62 min. 4 reports 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
Aug 22, 1997, 3:13 PM MDT (21:13 UTC)
Expired
Aug 22, 1997, 4:15 PM MDT
In force
62 min
Issued by
NWS Pocatello, ID
Area
Whole counties

County Bannock County, ID

The radar

The Pocatello radar (KSFX), 61 km from the middle of the area, began a volume at 21:12 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

TimeReportWhereRemark
Aug 22, 3:15 PM MDTHail 1Pocatello, ID
Aug 22, 3:37 PM MDTHail 1Pocatello, IDQuarter-size hail along Yellowstone Avenue.
Aug 22, 3:43 PM MDTHail 1.25Pocatello, IDHalf dollar-size hail at Indian Hills School.
Aug 22, 4:12 PM MDTHail 0.75Pocatello, IDDime-size hail east bench area of Pocatello.

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

Salt Lake City I, UT (KSLC), launched 12:00Z, 9.2 hours before the alert went out and 212 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 1997-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 68 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 1997-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
68 J/kg
Mixed-layer CIN
-339 J/kg
Mixed-layer LCL
2430 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
30 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 Aug 22, 2:30 PM MDT, 43 minutes earlier.

Area forecast discussion, Aug 22, 2:30 PM MDT, 43 minutes before
EASTERN IDAHO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
200 PM MDT FRI AUG 22 1997

THE LOW LEVEL WIND AND MOISTURE FIELDS ARE SUFFICIENT THIS AFTERNOON
TO SUPPORT ISOLATED MODERATE TO STRONG THUNDERSTORMS. STORMS SHOULD
BEGIN FADING BY EARLY EVENING AS DAYTIME HEATING IS PROVIDING MAIN
ENERGY.  ADDITIONAL MONSOONAL MOISTURE WILL SURGE NORTHWARD LATE
TONIGHT AND SATURDAY.  TEMPERATURES WILL BE RELATIVELY MILD TONIGHT
DUE TO THE INCREASE IN MOISTURE AT ALL LEVELS.  SHORTWAVE TROF WILL
BEGIN SHIFTING EAST AND INLAND SATURDAY.  LOW LEVEL FRONTAL/THERMAL
TROF CONVERGENCE AND INCREASING UPPER LEVEL DIFFLUENT FLOW WILL CREATE
A MORE FAVORABLE CONVECTIVE ENVIRONMENT LATE SATURDAY AND SATURDAY
NIGHT.  IN FACT...BELIEVE ACTIVITY WILL PEAK AND POTENTIALLY BE STRONG
SATURDAY NIGHT. SURFACE COLD FRONT SHOULD MOVE ACROSS EASTERN IDAHO
SUNDAY MORNING WITH COOLER...DRYER AIR FLOODING ACROSS THE REGION
SUNDAY AFTERNOON.

LONG RANGE GUIDANCE CONTINUES TO REBOUND A STRONG RIDGE OF HIGH
PRESSURE AND SIMILAR MONSOONAL MOISTURE CONCERNS BY TUESDAY AND
WEDNESDAY NEXT WEEK.  BAUCK

.WSR88D KSFX OPERATIONAL...VCP21.

IDA BB 056/091 058/080 047 03235
PIH BB 058/092 059/082 048 03345

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 3:13 PM MDTFlash Flood WarningPIHBannock62 min
Aug 22, 3:59 PM MDTFlash Flood WarningPIHCassia61 min
Aug 22, 3:59 PM MDTSevere Thunderstorm WarningPIHCassia61 min
Aug 22, 4:04 PM MDTFlash Flood WarningPIHBannock56 min
Aug 22, 4:04 PM MDTSevere Thunderstorm WarningPIHBannock56 min
Aug 22, 4:20 PM MDTSevere Thunderstorm WarningPIHBingham40 min
Aug 22, 5:00 PM MDTFlash Flood WarningPIHBannock45 min
Aug 22, 5:00 PM MDTFlash Flood WarningPIHBannock, Caribou60 min
Aug 22, 5:35 PM MDTFlash Flood WarningPIHBannock55 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; radar from the NEXRAD Level II archive.