Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 63, NWS Des Moines, IA

October 14, 1998Marshall County, Iowa

NWS Des Moines, IA issued this tornado warning at Oct 14, 1998, 3:49 PM CDT for Marshall County, Iowa. It was in force for 16 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
Oct 14, 1998, 3:49 PM CDT (20:49 UTC)
Expired
Oct 14, 1998, 4:05 PM CDT
In force
16 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Marshall County, IA

The radar

The Des Moines radar (KDMX), 69 km from the middle of the area, began a volume at 20:52 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

Davenport, (KDVN), launched 12:00Z, 8.8 hours before the alert went out and 212 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, Davenport, at 12:00Z on 1998-10-14Temperature 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, Davenport, at 12:00Z on 1998-10-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 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
1560 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
184 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.

689 
WFUS1 KDSM 142050 RRA
TORDSM
IAC127-142105-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
349 PM CDT WED OCT 14 1998

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN MARSHALL COUNTY IN CENTRAL IOWA

* UNTIL 405 PM CDT

* AT 347 PM CDT... LOCAL LAW ENFORCEMENT REPORTED A TORNADO 32 MILES
  NORTHEAST OF DES MOINES OR 9 MILES WEST SOUTHWEST OF HAVERHILL...
  MOVING EAST AT 30 MPH.

* THIS TORNADO CAN BE EXPECTED NEAR...
   MELBOURNE          BY 355 PM CDT
   HAVERHILL          BY 404 PM CDT

A TORNADO IS ON THE GROUND GO TO THE BASEMENT IF A BASEMENT IS
NOT AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR

SS/CC

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 14, 1:24 PM CDTSevere Thunderstorm WarningDMXWebster31 min
Oct 14, 1:26 PM CDTSevere Thunderstorm WarningDMXEmmet34 min
Oct 14, 4:18 PM CDTSevere Thunderstorm WarningDMXMarshall32 min
Oct 14, 4:51 PM CDTSevere Thunderstorm WarningDMXMarshall, Tama34 min
Oct 14, 5:21 PM CDTSevere Thunderstorm WarningDMXTama34 min
Oct 14, 6:58 PM CDTSevere Thunderstorm WarningDMXHardin32 min

Nearby

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