Alert archive / Iowa / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 39, NWS Omaha, NE

June 19, 1997Pottawattamie County, Shelby County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jun 19, 1997, 11:59 PM CDT for Pottawattamie County, Shelby County, Iowa. It was in force for 51 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
Jun 19, 1997, 11:59 PM CDT (04:59 UTC)
Expired
Jun 20, 1997, 12:50 AM CDT
In force
51 min
Issued by
NWS Omaha, NE
Area
Whole counties

Counties Pottawattamie County, IA, Shelby County, IA

The radar

The Omaha radar (KOAX), 81 km from the middle of the area, began a volume at 05:01 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 00:00Z, 5.0 hours before the alert went out and 82 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 00:00Z on 1997-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1320 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1997-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
1320 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
2762 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOMA 200459 RRA
SVROMA
IAC155-165-200550-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1159 PM CDT THU JUN 19 1997

* SEVERE THUNDERSTORM WARNING FOR
  SOUTHERN SHELBY COUNTY - IN SOUTHWESTERN IOWA
  EASTERN POTTAWATTAMIE COUNTY - IN SOUTHWESTERN IOWA

* UNTIL 1250 AM CDT
 
* SOME LOCATIONS AFFECTED
  MINDEN                       BY AROUND 1158 PM CDT
  TENNANT                      BY AROUND 1202 AM CDT
  SHELBY                       BY AROUND 1205 AM CDT
  CORLEY                       BY AROUND 1210 AM CDT
  AVOCA                        BY AROUND 1215 AM CDT

* AT 1158 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR 29 MILES NORTHEAST OF DOWNTOWN OMAHA OR IN THE VICINITY OF
  MINDEN MOVING EAST SOUTHEAST AT 35 MPH.
 
PEOPLE IN THE WARNED AREA SHOULD GET INTO A REINFORCED SHELTER AND
PREPARE FOR DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN...AND
DANGEROUS LIGHTNING.

MILLER

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.