Alert archive / Iowa / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 2, NWS Sioux Falls, SD

May 7, 1997Buena Vista County, Ida County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 7, 1997, 10:25 AM CDT for Buena Vista County, Ida County, Iowa. It was in force for 30 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
May 7, 1997, 10:25 AM CDT (15:25 UTC)
Expired
May 7, 1997, 10:55 AM CDT
In force
30 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Buena Vista County, IA, Ida County, IA

The radar

The Sioux Falls radar (KFSD), 161 km from the middle of the area, began a volume at 15:28 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

Omaha, NE (KOAX), launched 12:00Z, 3.4 hours before the alert went out and 163 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, Omaha, NE at 12:00Z on 1997-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Omaha, NE at 12:00Z on 1997-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 155 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
963 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
155 m²/s²
0-3 km storm-relative helicity
202 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 071526 RRA
SVRFSD
IAC021-093-071555-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1025 AM CDT WED MAY 7 1997

* SEVERE THUNDERSTORM WARNING FOR
  WESTERN BUENA VISTA COUNTY - IN NORTHWESTERN IOWA
  EASTERN CHEROKEE COUNTY - IN NORTHWESTERN IOWA
  EASTERN IDA COUNTY - IN NORTHWESTERN IOWA

* UNTIL 1055 AM CDT
 
* THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
  ALTA                     AROUND 1030 AM CDT
  LINN GROVE               AROUND 1035 AM CDT
  STORM LAKE               AROUND 1040 AM CDT
  TRUESDALE                AROUND 1040 AM CDT
  SIOUX RAPIDS             AROUND 1045 AM CDT
  SULPHUR SPRINGS          AROUND 1045 AM CDT
  GALVA                    AROUND 1055 AM CDT

* AT 1020 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 12 MILES WEST OF LINN GROVE MOVING EAST AT
  40 MPH.
 
AT SIGNS OF AN IMPENDING STORM...TOWERING THUNDERHEADS...DARRKENING
SKIES...LIGHTNING AND INCREASING WINDS...MOVE TO A PLACE OF SAFETY.
TUNE TO NOAA WEATHER RADIO OR YOUR LOCAL MEDIA OUTLET FOR THE LATEST
WEATHER INFORMATION.

HOLMES

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 7, 10:14 AM CDTSevere Thunderstorm WarningFSDBuena Vista16 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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; radar from the NEXRAD Level II archive.