Alert archive / Iowa / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 248, NWS Des Moines, IA

June 29, 1998Decatur County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 29, 1998, 6:19 PM CDT for Decatur County, Iowa. It was in force for 66 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 29, 1998, 6:19 PM CDT (23:19 UTC)
Expired
Jun 29, 1998, 7:25 PM CDT
In force
66 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Decatur County, IA

The watch it was issued in

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

IssuedProductOfficeLasted
Jun 29, 4:15 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.3 hours before the alert went out and 226 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 1998-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2006 joules per kilogram.LCLLFCEL10008507005003002001001 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 1998-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.1939587897Sfc1 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
2006 J/kg
Mixed-layer CIN
-188 J/kg
Mixed-layer LCL
850 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOMA 292320 RRA
SVRDSM
IAC053-300025-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
ISSUED BY NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
619 PM CDT MON JUN 29 1998

THE NATIONAL WEATHER SERVICE IN OMAHA/VALLEY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DECATUR COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 725 PM CDT

* AT 618 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 61 MILES SOUTH SOUTHWEST OF DES MOINES OR 7
  MILES WEST SOUTHWEST OF GRAND RIVER MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GRAND RIVER                  AT 630 PM CDT
  DECATUR CITY                 AT 640 PM CDT
  VAN WERT                     AT 645 PM CDT
  LEON                         AT 650 PM CDT
  WELDON                       AT 650 PM CDT

GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! A TORNADO
WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO
PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

BYRD

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

Special weather statement, Jun 29, 1:25 PM CDT, 4 hours 54 minutes before
IAZ004>007-015>017-023>026-033>034-291930-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
125 PM CDT MON JUN 29 1998

THE FOLLOWING COUNTIES OF TORNADO WATCH NUMBER 699 HAVE BEEN
CLEARED FROM THE WATCH...

EMMET - KOSSUTH - WINNEBAGO - WORTH - PALO ALTO - HANCOCK - CERRO
GORDO - POCAHONTAS - HUMBOLDT - WRIGHT - FRANKLIN - SAC - AND CALHOUN.

THE REMAINDER OF THE WATCH REMAINS IN EFFECT UNTIL 500 PM.  IN ADDITION
TORNADO WATCH NUMBER 700 REMAINS IN EFFECT UNTIL 500 PM FOR THE REST
OF SOUTHERN AND EASTERN IOWA.

THUNDERSTORMS WILL CONTINUE OVER THE CLEARED COUNTIES...HOWEVER THE
THREAT OF SEVERE WEATHER HAS PASSED TO THE SOUTH.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 12:18 PM CDTSevere Thunderstorm WarningDMXCarroll47 min
Jun 29, 12:24 PM CDTSevere Thunderstorm WarningDMXCalhoun36 min
Jun 29, 12:32 PM CDTTornado WarningDMXHamilton33 min
Jun 29, 12:37 PM CDTSevere Thunderstorm WarningDMXWebster48 min
Jun 29, 12:41 PM CDTTornado WarningDMXCrawford49 min
Jun 29, 12:59 PM CDTSevere Thunderstorm WarningDMXHardin51 min
Jun 29, 1:09 PM CDTSevere Thunderstorm WarningDMXStory36 min
Jun 29, 1:17 PM CDTSevere Thunderstorm WarningDMXBoone33 min
Jun 29, 1:20 PM CDTSevere Thunderstorm WarningDMXMarshall50 min
Jun 29, 1:23 PM CDTTornado WarningDMXBoone, Dallas32 min
Jun 29, 1:32 PM CDTTornado WarningDMXPolk33 min
Jun 29, 1:39 PM CDTSevere Thunderstorm WarningDMXDallas31 min
Jun 29, 1:44 PM CDTSevere Thunderstorm WarningDMXJasper, Tama46 min
Jun 29, 1:48 PM CDTTornado WarningDMXDallas, Madison47 min
Jun 29, 1:53 PM CDTSevere Thunderstorm WarningDMXWarren32 min
Jun 29, 2:04 PM CDTSevere Thunderstorm WarningDMXPolk21 min
Jun 29, 2:08 PM CDTSevere Thunderstorm WarningDMXPoweshiek47 min
Jun 29, 2:08 PM CDTSevere Thunderstorm WarningDMXMarion47 min
Jun 29, 2:11 PM CDTSevere Thunderstorm WarningDMXMadison34 min
Jun 29, 2:18 PM CDTTornado WarningDMXTama32 min
Jun 29, 2:23 PM CDTTornado WarningDMXMarion32 min
Jun 29, 2:28 PM CDTSevere Thunderstorm WarningDMXLucas, Mahaska, Monroe62 min
Jun 29, 2:28 PM CDTSevere Thunderstorm WarningDMXClarke, Warren62 min
Jun 29, 2:44 PM CDTSevere Thunderstorm WarningDMXWapello66 min
Jun 29, 2:55 PM CDTSevere Thunderstorm WarningDMXAppanoose, Davis65 min
Jun 29, 3:10 PM CDTTornado WarningDMXDavis35 min
Jun 29, 3:25 PM CDTTornado WarningDMXDallas50 min
Jun 29, 3:27 PM CDTSevere Thunderstorm WarningDMXGuthrie48 min
Jun 29, 3:40 PM CDTTornado WarningDMXPolk35 min
Jun 29, 3:47 PM CDTTornado WarningDMXWarren33 min
Jun 29, 4:05 PM CDTSevere Thunderstorm WarningDMXJasper, Marion50 min
Jun 29, 5:41 PM CDTSevere Thunderstorm WarningDMXClarke49 min
Jun 29, 5:44 PM CDTSevere Thunderstorm WarningDMXTaylor51 min
Jun 29, 6:00 PM CDTSevere Thunderstorm WarningDMXRinggold35 min
Jun 29, 6:25 PM CDTSevere Thunderstorm WarningDMXAppanoose, Wayne65 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1998Every 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; the sounding from the Mesonet's radiosonde archive.