Alert archive / Iowa / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 13, NWS Des Moines, IA

May 8, 2000Poweshiek County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 8, 2000, 5:30 AM CDT for Poweshiek County, Iowa. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: May 8, 2000, 5:30 AM CDT (10:30 UTC)
Expired: May 8, 2000, 6:00 AM CDT
In force: 30 min
Issued by: NWS Des Moines, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Poweshiek County, IA

What was reported inside it

Time	Report	Where	Remark
May 8, 5:45 AM CDT	Thunderstorm Wind 65 E	Grinnell, 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 nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 10.5 hours before the alert went out and 169 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: 142 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 1763 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 63 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.

000 
WUUS53 KDMX 081032
SVRDSM
IAC157-081100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
530 AM CDT MON MAY 8 2000

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN POWESHIEK COUNTY IN CENTRAL IOWA

* UNTIL 600 AM CDT

* AT 530 AM CDT LAW ENFORCEMENT REPORTED AND RADAR INDICATED SEVERE  
  THUNDERSTORMS WITH DAMAGING WINDS NEAR KELLOGG TO 5 MILES WEST OF  
  GRINNELL...OR ABOUT 42 MILES EAST OF DES MOINES...MOVING NORTHEAST 
  AT 40 MPH.

* THE LINE OF SEVERE THUNDERSTORMS WILL BE...
  IN GRINNELL NOW
  MALCOM AT 540 AM CDT
  8 MILES NORTHWEST OF BROOKLYN AROUND 540 AM CDT
  
AT 520 AM CDT...LAW ENFORCEMENT REPORTED 65 MPH WINDS NEAR KELLOGG.

DAMAGING WINDS OF 60 TO 70 MILES AN HOUR ARE LIKELY IN THE WARNED
AREA.

DAMAGING STRAIGHT LINE WINDS OVER 75 MPH CAN SOUND JUST LIKE A
TORNADO AND CAUSE JUST AS MUCH DAMAGE.

LAT...LON 4185 9276 4162 9276 4169 9231 4184 9219
          4187 9239
&

KULA
NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 1:58 AM CDT	Severe Thunderstorm Warning	DMX	Kossuth	32 min
May 8, 2:51 AM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass	29 min
May 8, 4:11 AM CDT	Severe Thunderstorm Warning	DMX	Dallas	29 min
May 8, 4:22 AM CDT	Severe Thunderstorm Warning	DMX	Polk, Warren	28 min
May 8, 4:37 AM CDT	Severe Thunderstorm Warning	DMX	Polk	33 min
May 8, 5:01 AM CDT	Severe Thunderstorm Warning	DMX	Jasper	29 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2000 Every severe thunderstorm warning in 2000

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.