Alert archive / Iowa / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 87, NWS Des Moines, IA

June 23, 2000Madison County, Warren County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 23, 2000, 11:03 AM CDT for Madison County, Warren County, Iowa. It was in force for 37 min. 6 reports 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: Jun 23, 2000, 11:03 AM CDT (16:03 UTC)
Expired: Jun 23, 2000, 11:40 AM CDT
In force: 37 min
Issued by: NWS Des Moines, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Madison County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 41 km from the middle of the area, began a volume at 16:04 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.

What was reported inside it

Time	Report	Where	Remark
Jun 23, 11:07 AM CDT	Thunderstorm Wind 56 E	Winterset, IA
Jun 23, 11:15 AM CDT	Thunderstorm Wind 61 E	St Marys, IA
Jun 23, 11:20 AM CDT	Hail 0.75	St Marys, IA
Jun 23, 11:23 AM CDT	Thunderstorm Wind 52 E	Norwalk, IA
Jun 23, 11:35 AM CDT	Thunderstorm Wind 52 E	Indianola, IA
Jun 23, 11:38 AM CDT	Thunderstorm Wind 95 M	Indianola, IA	Microburst event

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

Omaha, NE (KOAX), launched 12:00Z, 4.1 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2896 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 210 m²/s²
0-3 km storm-relative helicity: 170 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.

037 
WUUS53 KDMX 231604
SVRDSM
IAC121-181-231640-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1103 AM CDT FRI JUN 23 2000

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MADISON COUNTY IN SOUTH CENTRAL IOWA
  WARREN COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 1140 AM

* AT 1059 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER ST. CHARLES...OR ABOUT 22 MILES SOUTHWEST
  OF DES MOINES...MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  NEAR MARTENSDALE AROUND 1110 AM
  NEAR INDIANOLA AROUND 1120 AM
  NEAR SANDYVILLE AROUND 1130 AM

HAIL UP TO THE SIZE OF NICKELS AND STRONG WINDS UP TO 60 MPH ARE 
LIKELY IN THE WARNED AREA.

STAY AWAY FROM WINDOWS DURING A SEVERE STORM...WIND GUSTS OVER 70 MPH
COULD BLOW THEM OUT.

LAT...LON 4150 9404 4116 9403 4117 9334 4149 9334

SMALL
NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 11:25 AM CDT	Severe Thunderstorm Warning	DMX	Polk	35 min
Jun 23, 12:54 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Monroe	36 min
Jun 23, 1:41 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Wayne	34 min
Jun 23, 2:17 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Wayne	43 min
Jun 23, 2:19 PM CDT	Tornado Warning	DMX	Wayne	26 min
Jun 23, 3:16 PM CDT	Flash Flood Warning	DMX	Wapello	119 min
Jun 23, 5:16 PM CDT	Flash Flood Warning	DMX	Wapello	119 min
Jun 23, 5:53 PM CDT	Flash Flood Warning	DMX	Monroe	2 hr
Jun 23, 6:25 PM CDT	Flash Flood Warning	DMX	Wapello	3 hr
Jun 23, 6:45 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass	30 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; radar from the NEXRAD Level II archive.