Alert archive / Iowa / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 169, NWS Des Moines, IA

June 18, 1998Emmet County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 18, 1998, 3:35 AM CDT for Emmet County, Iowa. It was in force for 30 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 18, 1998, 3:35 AM CDT (08:35 UTC)
Expired
Jun 18, 1998, 4:05 AM CDT
In force
30 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Emmet County, IA

The radar

The Sioux Falls radar (KFSD), 167 km from the middle of the area, began a volume at 08:37 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

Minneapolis, MN (KMPX), launched 00:00Z, 8.6 hours before the alert went out and 185 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, Minneapolis, MN at 00:00Z on 1998-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Minneapolis, MN at 00:00Z on 1998-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1499 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
379 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

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

832 
WUUS1 KDSM 180834 RRA
SVRDSM
IAC063-180905-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
335 AM CDT THU JUN 18 1998

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EMMET COUNTY IN NORTHWESTERN IOWA

* UNTIL 405 AM CDT

* AT 333 AM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 25
  MILES EAST NORTHEAST OF SPENCER OR 8 MILES WEST SOUTHWEST OF
  RINGSTED MOVING NORTHEAST AT 40 MPH.

* THIS STORM CAN BE EXPECTED NEAR...
   RINGSTED           NOW
   MAPLE HILL         ABOUT NOW
   ARMSTRONG          BY 344 AM CDT

LARGE HAIL IS LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM
WINDOWS

MYERS

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 9:12 AM CDTSevere Thunderstorm WarningDMXAdair, Cass, Guthrie33 min
Jun 18, 10:05 AM CDTSevere Thunderstorm WarningDMXWebster35 min
Jun 18, 10:41 AM CDTSevere Thunderstorm WarningDMXMarion34 min
Jun 18, 10:45 AM CDTSevere Thunderstorm WarningDMXBoone, Webster35 min
Jun 18, 10:54 AM CDTSevere Thunderstorm WarningDMXPolk31 min
Jun 18, 11:06 AM CDTSevere Thunderstorm WarningDMXJasper34 min
Jun 18, 11:12 AM CDTSevere Thunderstorm WarningDMXWarren33 min
Jun 18, 11:15 AM CDTSevere Thunderstorm WarningDMXMarshall, Story35 min
Jun 18, 11:21 AM CDTSevere Thunderstorm WarningDMXMarion34 min
Jun 18, 11:22 AM CDTSevere Thunderstorm WarningDMXPolk33 min
Jun 18, 11:36 AM CDTSevere Thunderstorm WarningDMXJasper34 min
Jun 18, 11:40 AM CDTSevere Thunderstorm WarningDMXBoone35 min
Jun 18, 11:43 AM CDTSevere Thunderstorm WarningDMXHardin32 min
Jun 18, 11:50 AM CDTSevere Thunderstorm WarningDMXMarshall, Story30 min
Jun 18, 12:01 PM CDTSevere Thunderstorm WarningDMXHamilton, Webster34 min
Jun 18, 12:55 PM CDTSevere Thunderstorm WarningDMXWinnebago, Worth30 min
Jun 18, 1:30 PM CDTSevere Thunderstorm WarningDMXDallas, Polk35 min
Jun 18, 1:33 PM CDTSevere Thunderstorm WarningDMXUnion32 min
Jun 18, 1:56 PM CDTTornado WarningDMXWarren34 min
Jun 18, 1:59 PM CDTFlash Flood WarningDMXDallas3 hr
Jun 18, 2:09 PM CDTSevere Thunderstorm WarningDMXPolk31 min
Jun 18, 2:16 PM CDTFlash Flood WarningDMXPolk3 hr
Jun 18, 2:16 PM CDTTornado WarningDMXPolk34 min
Jun 18, 2:19 PM CDTFlash Flood WarningDMXStory3 hr
Jun 18, 2:35 PM CDTFlash Flood WarningDMXMadison3 hr
Jun 18, 3:03 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion32 min
Jun 18, 3:12 PM CDTSevere Thunderstorm WarningDMXPoweshiek28 min
Jun 18, 3:16 PM CDTSevere Thunderstorm WarningDMXBlack Hawk, Tama34 min
Jun 18, 3:34 PM CDTSevere Thunderstorm WarningDMXDavis, Wapello31 min
Jun 18, 5:04 PM CDTFlash Flood WarningDMXPolk, Story2 hr

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; radar from the NEXRAD Level II archive.