Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 9, NWS Omaha, NE

June 21, 1997Mills County, Iowa; Sarpy County, Nebraska

NWS Omaha, NE issued this tornado warning at Jun 21, 1997, 1:11 AM CDT for Mills County, Iowa; Sarpy County, Nebraska. It was in force for 34 min. 2 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
Jun 21, 1997, 1:11 AM CDT (06:11 UTC)
Expired
Jun 21, 1997, 1:45 AM CDT
In force
34 min
Issued by
NWS Omaha, NE
Area
Whole counties

Counties Mills County, IA, Sarpy County, NE

The radar

The Omaha radar (KOAX), 50 km from the middle of the area, began a volume at 06:11 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
Jun 21, 1:30 AM CDTThunderstorm Wind 52Malvern, IA
Jun 21, 1:33 AM CDTThunderstorm WindBellevue, NE

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 watch it was issued in

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

IssuedProductOfficeLasted
Jun 20, 8:00 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.2 hours before the alert went out and 50 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 1997-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5994 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 1997-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 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
5994 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1151 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
4.8
Supercell composite
25.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOMA 210611 RRA
TOROMA
IAC129-NEC153-210645-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
111 AM CDT SAT JUN 21 1997

* TORNADO WARNING FOR
  SARPY COUNTY - IN EAST CENTRAL NEBRASKA
  MILLS COUNTY - IN SOUTHWESTERN IOWA

* UNTIL 145 AM CDT
 
* SOME LOCATIONS AFFECTED
  GLENWOOD                     BY AROUND 115 AM CDT
  MINEOLA                      BY AROUND 118 AM CDT
  SILVER CITY                  BY AROUND 120 AM CDT
  HASTINGS                     BY AROUND 135 AM CDT

* AT 109 AM CDT...A POSSIBLE TORNADO WAS INDICATED BY DOPPLER RADAR
  12 MILES SOUTH SOUTHEAST OF DOWNTOWN OMAHA OR 5 MILES NORTHWEST OF
  GLENWOOD MOVING EAST AT 30 MPH.
 
A TORNADO WATCH 4IS ALSO IN EFFECT.  MOVE TO AN INTERIOR ROOM...
PREFERABLY A BASEMENT.  STAY AWAY FROM WINDOWS.  REMEMBER THAT
SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES.  BE ON THE LOOKOUT.



FOBERT

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 8:54 PM CDTSevere Thunderstorm WarningOAXMonona51 min
Jun 20, 11:08 PM CDTSevere Thunderstorm WarningOAXHarrison, Monona62 min
Jun 21, 1:05 AM CDTSevere Thunderstorm WarningOAXMills60 min
Jun 21, 1:30 AM CDTSevere Thunderstorm WarningOAXFremont, Montgomery, Page65 min
Jun 20, 7:08 PM CDTSevere Thunderstorm WarningOAXDodge, Saunders47 min
Jun 20, 7:31 PM CDTSevere Thunderstorm WarningOAXButler, Colfax49 min
Jun 20, 7:35 PM CDTSevere Thunderstorm WarningOAXBurt, Washington50 min
Jun 20, 7:54 PM CDTSevere Thunderstorm WarningOAXDodge, Saunders46 min
Jun 20, 8:25 PM CDTSevere Thunderstorm WarningOAXBurt50 min
Jun 20, 8:35 PM CDTSevere Thunderstorm WarningOAXThurston50 min
Jun 20, 8:43 PM CDTSevere Thunderstorm WarningOAXCuming, Dodge47 min
Jun 20, 8:48 PM CDTSevere Thunderstorm WarningOAXBoone62 min
Jun 20, 9:12 PM CDTSevere Thunderstorm WarningOAXAntelope63 min
Jun 20, 9:24 PM CDTSevere Thunderstorm WarningOAXCuming, Stanton51 min
Jun 20, 9:40 PM CDTSevere Thunderstorm WarningOAXMadison, Pierce50 min
Jun 20, 10:09 PM CDTTornado WarningOAXCuming51 min
Jun 20, 10:56 PM CDTSevere Thunderstorm WarningOAXBurt64 min
Jun 20, 11:22 PM CDTTornado WarningOAXDodge48 min
Jun 20, 11:42 PM CDTSevere Thunderstorm WarningOAXButler, Seward58 min
Jun 20, 11:48 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson, Lancaster, Saline62 min
Jun 21, 12:08 AM CDTFlash Flood WarningOAXBurt, Cuming, Dodge6 hr
Jun 21, 12:17 AM CDTSevere Thunderstorm WarningOAXSaunders63 min

Nearby

Tornado Warnings in Iowa, 1997Tornado Warnings in Nebraska, 1997Every tornado warning in 1997Tornadoes 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.