Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 28, NWS Omaha, NE

May 28, 1998Shelby County, Iowa

NWS Omaha, NE issued this tornado warning at May 28, 1998, 10:54 PM CDT for Shelby County, Iowa. It was in force for 61 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 28, 1998, 10:54 PM CDT (03:54 UTC)
Expired: May 28, 1998, 11:55 PM CDT
In force: 61 min
Issued by: NWS Omaha, NE
Area: Whole counties

County Shelby County, IA

The radar

The Omaha radar (KOAX), 97 km from the middle of the area, began a volume at 03:58 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 28, 8:45 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.9 hours before the alert went out and 97 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2835 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1954 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 7.5

Open this sounding in Storm Lab

The text

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

545 
WFUS1 KOMA 290355 RRA
TOROMA
IAC165-290455-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1054 PM CDT THU MAY 28 1998

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* TORNADO WARNING FOR...
  SHELBY COUNTY IN SOUTHWESTERN IOWA

* UNTIL 1155 PM CDT

* AT 1053 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A POSSIBLE TORNADO 53 MILES NORTHEAST OF DOWNTOWN OMAHA OR 5 MILES
  NORTHWEST OF IRWIN MOVING SOUTHEAST AT 20 MPH.  OTHER STORMS
  WILL LIKELY MOVE INTO THE NORTHWEST PART OF THE COUNTY FROM THE
  NORTHWEST AND MOVE TOWARD EARLING.

* THE TORNADO IS EXPECTED TO BE NEAR...
  BOTNA                        AROUND 1100 PM CDT
  IRWIN                        AROUND 1105 PM CDT

PERSONS IN THE WARNED AREA SHOULD TAKE SHELTER IN A BASEMENT IF
AVAILABLE.  OTHERWISE GO TO A SMALL INTERIOR ROOM ON THE LOWEST
FLOOR.  CARS AND MOBILE HOMES SHOULD BE ABANDONED.  LARGE HAIL AND
DAMAGING STRAIGHTLINE WINDS ARE POSSIBLE AS WELL.

BCM

What forecasters said that day

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

In the hours before

Local storm report, May 28, 7:45 PM CDT, 3 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
745 PM CDT THU MAY 28 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0640 PM    6 NE COLERIDGE            NE   TORNADO
05/28/98   CEDAR                          INITIAL TOUCHDOWN

0645 PM    10 ESE HARTINGTON         NE   TORNADO
05/28/98   CEDAR                          *** 1 INJ ***
                                          3 FARMS DAMAGED NEAR
                                          HIGHWAY 57.  TOTAL PATH
                                          LENGTH ABOUT 8 MILES.
                                          INJURY OCCURRED 1 MILE
                                          SOUTHEAST OF HIGHWAY
                                          84/57 JUNCTION

BYRD

Local storm report, May 28, 7:45 PM CDT, 3 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
745 PM CDT THU MAY 28 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0640 PM    6 NE COLERIDGE            NE   TORNADO
05/28/98   CEDAR                          INITIAL TOUCHDOWN

0645 PM    10 ESE HARTINGTON         NE   TORNADO
05/28/98   CEDAR                          *** 1 INJ ***
                                          3 FARMS DAMAGED NEAR
                                          HIGHWAY 57.  TOTAL PATH
                                          LENGTH ABOUT 8 MILES.
                                          INJURY OCCURRED 1 MILE
                                          SOUTHEAST OF HIGHWAY
                                          84/57 JUNCTION

BYRD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 8:40 PM CDT	Tornado Warning	OAX	Monona	60 min
May 28, 9:40 PM CDT	Tornado Warning	OAX	Monona	45 min
May 28, 10:18 PM CDT	Tornado Warning	OAX	Harrison	62 min
May 28, 10:25 PM CDT	Severe Thunderstorm Warning	OAX	Monona	35 min
May 28, 11:20 PM CDT	Severe Thunderstorm Warning	OAX	Harrison	60 min
May 28, 11:57 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie, Shelby	63 min
May 29, 1:02 AM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	58 min
May 29, 1:36 AM CDT	Severe Thunderstorm Warning	OAX	Mills, Montgomery	59 min
May 29, 2:33 AM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills, Montgomery, Page	47 min
May 29, 3:38 AM CDT	Severe Thunderstorm Warning	OAX	Fremont, Page	62 min

Nearby

Tornado Warnings in Iowa, 1998 Every tornado warning in 1998 Tornadoes in 1998

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.