Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 17, NWS Des Moines, IA

May 28, 1998Pocahontas County, Iowa

NWS Des Moines, IA issued this tornado warning at May 28, 1998, 3:14 PM CDT for Pocahontas County, Iowa. It was in force for 36 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 28, 1998, 3:14 PM CDT (20:14 UTC)
Expired: May 28, 1998, 3:50 PM CDT
In force: 36 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Pocahontas County, IA

What was reported inside it

Time	Report	Where	Remark
May 28, 3:40 PM CDT	Tornado F0	Pocahontas, 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, 3:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 8.2 hours before the alert went out and 210 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: 1669 J/kg
Mixed-layer CIN: -237 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 226 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.

723 
WFUS1 KDSM 282016 RRA
TORDSM
IAC151-282050-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
314 PM CDT THU MAY 28 1998

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN POCAHONTAS COUNTY IN NORTHWESTERN IOWA

* UNTIL 350 PM CDT

* AT 313 PM CDT... LOCAL LAW ENFORCEMENT REPORTED A TORNADO 28 MILES
  SOUTHEAST OF SPENCER OR 5 MILES SOUTH OF LAURENS MOVING
  EAST AT 25 MPH.

* THIS TORNADO CAN BE EXPECTED NEAR...
   HAVELOCK           BY 320 PM CDT
   PLOVER             BY 322 PM CDT
   ROLFE              BY 335 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

JUNGBLUTH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 3:26 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto	34 min
May 28, 3:49 PM CDT	Tornado Warning	DMX	Pocahontas	31 min
May 28, 4:08 PM CDT	Severe Thunderstorm Warning	DMX	Webster	37 min
May 28, 4:10 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt	30 min
May 28, 4:25 PM CDT	Severe Thunderstorm Warning	DMX	Wright	20 min
May 28, 4:28 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton	32 min
May 28, 4:44 PM CDT	Tornado Warning	DMX	Wright	21 min
May 28, 4:59 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	31 min
May 28, 5:26 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	34 min
May 28, 5:56 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Webster	34 min
May 28, 6:01 PM CDT	Severe Thunderstorm Warning	DMX	Grundy	34 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.