Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 31, NWS Des Moines, IA

May 30, 1998Boone County, Iowa

NWS Des Moines, IA issued this tornado warning at May 30, 1998, 1:25 PM CDT for Boone County, Iowa. It was in force for 35 min. 2 reports 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 30, 1998, 1:25 PM CDT (18:25 UTC)
Expired: May 30, 1998, 2:00 PM CDT
In force: 35 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Boone County, IA

What was reported inside it

Time	Report	Where	Remark
May 30, 1:25 PM CDT	Hail 2.75	Boone, IA
May 30, 1:31 PM CDT	Tornado F0	Fraser, 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 30, 12:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 30, 1:00 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 6.4 hours before the alert went out and 218 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: 1795 J/kg
Mixed-layer CIN: -289 J/kg
Mixed-layer LCL: 852 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDSM 301825 RRA
TORDSM
IAC015-301900-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
125 PM CDT SAT MAY 30 1998

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  BOONE COUNTY IN CENTRAL IOWA

* UNTIL 200 PM CDT

* AT 123 PM CDT... LOCAL LAW ENFORCEMENT REPORTED A TORNADO 29 MILES
  SOUTH SOUTHEAST OF FORT DODGE OR IN THE VICINITY OF OGDEN MOVING
  EAST SOUTHEAST AT 40 MPH.

* THIS TORNADO CAN BE EXPECTED NEAR...
   FRASER             NOW
   MOINGONA           BY 130 PM CDT
   BOONE              BY 132 PM CDT
   LUTHER             BY 140 PM CDT

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

SS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 11:39 AM CDT	Severe Thunderstorm Warning	DMX	Sac	51 min
May 30, 12:10 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun	50 min
May 30, 12:38 PM CDT	Severe Thunderstorm Warning	DMX	Greene, Webster	47 min
May 30, 12:46 PM CDT	Tornado Warning	DMX	Calhoun, Greene	34 min
May 30, 1:05 PM CDT	Severe Thunderstorm Warning	DMX	Boone	50 min
May 30, 1:34 PM CDT	Severe Thunderstorm Warning	DMX	Story	51 min
May 30, 1:50 PM CDT	Tornado Warning	DMX	Boone	50 min
May 30, 2:12 PM CDT	Severe Thunderstorm Warning	DMX	Marshall	48 min
May 30, 2:20 PM CDT	Tornado Warning	DMX	Marshall	50 min
May 30, 2:52 PM CDT	Severe Thunderstorm Warning	DMX	Tama	48 min
May 30, 3:08 PM CDT	Tornado Warning	DMX	Marshall	22 min
May 30, 3:08 PM CDT	Tornado Warning	DMX	Marshall	17 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.