Alert archive / Iowa / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 147, NWS Des Moines, IA

May 29, 1998Cass County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 29, 1998, 1:24 AM CDT for Cass County, Iowa. It was in force for 31 min. 1 report 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: May 29, 1998, 1:24 AM CDT (06:24 UTC)
Expired: May 29, 1998, 1:55 AM CDT
In force: 31 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Cass County, IA

The radar

The Des Moines radar (KDMX), 110 km from the middle of the area, began a volume at 06:26 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

Time	Report	Where	Remark
May 29, 1:55 AM CDT	Hail 1.75	Lewis, IA

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.

Issued	Product	Office	Lasted
May 28, 11:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.4 hours before the alert went out and 120 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.

000 
TTAA00 KDSM 290624 RRA
SVRDSM
IAC029-290655-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
124 AM CDT FRI MAY 29 1998

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CASS COUNTY IN SOUTHWESTERN IOWA

* UNTIL 155 AM CDT

* AT 123 AM CDT... LOCAL LAW ENFORCEMENT REPORTED A SEVERE
  THUNDERSTORM 51 MILES EAST OF OMAHA OR 8 MILES WEST OF MASSENA
  MOVING EAST AT 30 MPH.  GOLF BALL SIZED HAIL WAS REPORTED NEAR
  LEWIS.

* THIS STORM CAN BE EXPECTED NEAR...
   MASSENA            BY 127 AM CDT

THIS STORM HAS A HISTORY OF LARGE HAIL. GO INSIDE A STURDY BUILDING
AND STAY AWAY FROM WINDOWS!

BSS/EP

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.

In the hours before

Local storm report, May 28, 8:39 PM CDT, 4 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
839 PM CDT THU MAY 28 1998

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

0340 PM    POCAHONTAS                IA   TORNADO
05/28/98   POCAHONTAS                     TORNADO 6 MILES NORTHWEST
                                          OF POCAHANTAS

0523 PM    RADCLIFFE                 IA   WIND DAMAGE
05/28/98   HARDIN                         SHINGLES BLOWN OFF ROOF

0542 PM    GRUNDY CENTER             IA   70 MPH TSTM GUST
05/28/98   GRUNDY                         JUST NORTH OF GRUNDY
                                          CENTER

0553 PM    BADGER                    IA   1.75 INCH HAIL
05/28/98   WEBSTER

Local storm report, May 28, 9:34 PM CDT, 3 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
934 PM CDT THU MAY 28 1998

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

0459 PM    IOWA FALLS                IA   3 INCH HAIL
05/28/98   HARDIN                         80 MPH WINDS

Local storm report, May 28, 9:56 PM CDT, 3 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
956 PM CDT THU MAY 28 1998

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

0856 PM    LAKE CITY                 IA   TORNADO
05/28/98   CALHOUN                        LIMBS DOWN AND 1 INCH
                                          HAIL...TORNADO REPORTED 4
                                          E LAKE CITY

Local storm report, May 28, 10:13 PM CDT, 3 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTION FOR FORMAT
NATIONAL WEATHER SERVICE DES MOINES IA
1013 PM CDT THU MAY 28 1998

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

0920 PM    1 N CHARTER OAK           IA   TORNADO
05/28/98   CRAWFORD                       REPORTED BY LOCAL FIRE
                                          DEPARTMENT

0926 PM    1 N LANYON                IA   1 INCH HAIL
05/28/98   WEBSTER

0940 PM    2 N SCHLESWIG             IA   .75 INCH HAIL
05/28/98   CRAWFORD

0951 PM    5 NW DENISON              IA   1.75 INCH HAIL
05/28/98   CRAWFORD

1012 PM    3 SE DELOIT               IA   1.75 INCH HAIL
05/28/98   CRAWFORD

SMALL

Local storm report, May 28, 10:13 PM CDT, 3 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1013 PM CDT THU MAY 28 1998

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

0920 PM    1 N CHARTER OAK           IA   TORNADO
05/28/98   CRAWFORD                       REPORTED BY LOCAL FIRE
                                          DEPARTMENT

0926 PM    1 N LANYON                IA   1 INCH HAIL
05/28/98   WEBSTER

0940 PM    2 N SCHLESWIG             IA   .75 INCH HAIL
05/28/98   CRAWFORD

0951 PM    5 NW DENISON              IA   1.75 INCH HAIL
05/28/98   CRAWFORD
1012 PM    3 SE DELOIT               IA   1.75 INCH HAIL
05/28/98   CRAWFORD

SMALL

Local storm report, May 28, 10:13 PM CDT, 3 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTION FOR FORMAT
NATIONAL WEATHER SERVICE DES MOINES IA
1013 PM CDT THU MAY 28 1998

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

0920 PM    1 N CHARTER OAK           IA   TORNADO
05/28/98   CRAWFORD                       REPORTED BY LOCAL FIRE
                                          DEPARTMENT

0926 PM    1 N LANYON                IA   1 INCH HAIL
05/28/98   WEBSTER

0940 PM    2 N SCHLESWIG             IA   .75 INCH HAIL
05/28/98   CRAWFORD

0951 PM    5 NW DENISON              IA   1.75 INCH HAIL
05/28/98   CRAWFORD

1012 PM    3 SE DELOIT               IA   1.75 INCH HAIL
05/28/98   CRAWFORD

SMALL

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 28, 8:20 PM CDT	Severe Thunderstorm Warning	DMX	Sac	20 min
May 28, 8:24 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun	36 min
May 28, 8:57 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Webster	33 min
May 28, 9:22 PM CDT	Tornado Warning	DMX	Crawford	33 min
May 28, 9:29 PM CDT	Severe Thunderstorm Warning	DMX	Webster	36 min
May 28, 9:41 PM CDT	Severe Thunderstorm Warning	DMX	Boone	34 min
May 28, 9:52 PM CDT	Tornado Warning	DMX	Crawford	33 min
May 28, 10:15 PM CDT	Severe Thunderstorm Warning	DMX	Story	50 min
May 28, 10:21 PM CDT	Tornado Warning	DMX	Carroll, Crawford	39 min
May 28, 10:21 PM CDT	Tornado Warning	DMX	Carroll, Crawford	34 min
May 28, 10:40 PM CDT	Severe Thunderstorm Warning	DMX	Marshall	50 min
May 28, 10:46 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	34 min
May 28, 10:50 PM CDT	Severe Thunderstorm Warning	DMX	Carroll	35 min
May 28, 11:04 PM CDT	Tornado Warning	DMX	Carroll	36 min
May 28, 11:10 PM CDT	Tornado Warning	DMX	Audubon	35 min
May 28, 11:25 PM CDT	Tornado Warning	DMX	Greene, Guthrie	35 min
May 28, 11:44 PM CDT	Tornado Warning	DMX	Audubon, Guthrie	36 min
May 28, 11:59 PM CDT	Tornado Warning	DMX	Dallas, Guthrie	51 min
May 29, 12:09 AM CDT	Severe Thunderstorm Warning	DMX	Audubon	36 min
May 29, 12:24 AM CDT	Tornado Warning	DMX	Guthrie	26 min
May 29, 12:33 AM CDT	Severe Thunderstorm Warning	DMX	Cass	32 min
May 29, 12:50 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Guthrie	50 min
May 29, 2:01 AM CDT	Severe Thunderstorm Warning	DMX	Adams	34 min
May 29, 2:01 AM CDT	Severe Thunderstorm Warning	DMX	Adams	39 min
May 29, 2:21 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Union	49 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1998 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.