Alert archive / Iowa / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 39, NWS Des Moines, IA

April 8, 2001Adair County, Union County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 8, 2001, 10:57 PM CDT for Adair County, Union County, Iowa. It was in force for 38 min. 2 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: Apr 8, 2001, 10:57 PM CDT (03:57 UTC)
Expired: Apr 8, 2001, 11:35 PM CDT
In force: 38 min
Issued by: NWS Des Moines, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Adair County, IA, Union County, IA

The radar

The Des Moines radar (KDMX), 106 km from the middle of the area, began a volume at 03:57 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
Apr 8, 11:11 PM CDT	Thunderstorm Wind 71 E	Leon, IA
Apr 8, 11:36 PM CDT	Hail 0.88	Humeston, 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
Apr 8, 7:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.0 hours before the alert went out and 236 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: 2 J/kg
Mixed-layer CIN: -182 J/kg
Mixed-layer LCL: 2153 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 300 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 090358
SVRDSM
IAC053-185-090450-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1058 PM CDT SUN APR 8 2001

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DECATUR COUNTY IN SOUTH CENTRAL IOWA
  WAYNE COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 1150 PM CDT

* AT 1057 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 11 MILES NORTHEAST OF LEON TO 11
  MILES SOUTHEAST OF LEON...OR FROM 47 MILES SOUTH OF DES MOINES TO
  68 MILES SOUTH OF DES MOINES...MOVING EAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE...
  NEAR CORYDON AROUND 1120 PM
  NEAR SEYMOUR AROUND 1130 PM

HAIL UP TO THE SIZE OF QUARTERS IS LIKELY IN THE WARNED AREA.

HURRICANE FORCE WINDS OF 70 TO 80 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM MONDAY MORNING FOR
IOWA.

LAT...LON 4090 9400 4059 9402 4059 9310 4091 9310

SEARCY

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 8, 8:58 PM CDT, 1 hour 59 minutes earlier.

Area forecast discussion, Apr 8, 8:58 PM CDT, 1 hour 59 minutes before

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE DES MOINES IA
758 PM CST SUN APR 8 2001

FLASH FLOOD WATCH TO BE ISSUED MOMENTARILY FOR SAME COUNTIES AS TOR
WATCH.

.DSM...TOR WATCH TIL 1 AM AND FFA TIL 4 AM FOR SRN 2/3RDS.

KULA

In the hours before

Local storm report, Apr 8, 10:43 PM CDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1043 PM CDT SUN APR 08 2001

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0734 PM    MONROE                    IA   1 INCH HAIL
04/08/01   JASPER                         REPORTED BY STORM
                                          SPOTTER.

0741 PM    REASNOR                   IA   .88 INCH HAIL
04/08/01   JASPER                         REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0741 PM    POLK CITY                 IA   1.75 INCH HAIL
04/08/01   POLK                           REPORTED BY STORM
                                          SPOTTER.

0752 PM    GRIMES                    IA   1.75 INCH HAIL
04/08/01   POLK                           REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0754 PM    GRIMES                    IA   1 INCH HAIL
04/08/01   POLK                           REPORTED BY STORM
                                          SPOTTER.

0802 PM    GRIMES                    IA   1 INCH HAIL
04/08/01   POLK                           REPORTED BY STORM
                                          SPOTTER.

0804 PM    EARLHAM                   IA   1 INCH HAIL
04/08/01   MADISON                        REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0812 PM    CONWAY                    IA   1.75 INCH HAIL
04/08/01   TAYLOR                         REPORTED BY STORM
                                          SPOTTER.

0845 PM    12 W MT AYR               IA   1.25 INCH HAIL
04/08/01   RINGGOLD                       REPORTED BY STORM
                                          SPOTTER.

0856 PM    MENLO                     IA   1 INCH HAIL
04/08/01   GUTHRIE                        REPORTED BY STORM
                                          SPOTTER.

0859 PM    REDFIELD                  IA   TORNADO
04/08/01   DALLAS                         REPORTED BY MEDIA.

0925 PM    WAUKEE                    IA   TORNADO
04/08/01   DALLAS                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

0927 PM    WAUKEE                    IA   1 INCH HAIL
04/08/01   DALLAS                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

0934 PM    1 W JOHNSTON              IA   .75 INCH HAIL
04/08/01   POLK                           REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0948 PM    WEST DES MOINES           IA   1.75 INCH HAIL
04/08/01   POLK                           REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

Local storm report, Apr 8, 10:49 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTION
NATIONAL WEATHER SERVICE DES MOINES IA
1049 PM CDT SUN APR 08 2001

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0737 PM    MONROE                    IA   1 INCH HAIL
04/08/01   JASPER                         REPORTED BY STORM
                                          SPOTTER.

Local storm report, Apr 8, 10:53 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTION
NATIONAL WEATHER SERVICE DES MOINES IA
1053 PM CDT SUN APR 08 2001

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0846 PM    MENLO                     IA   1 INCH HAIL
04/08/01   GUTHRIE                        REPORTED BY STORM
                                          SPOTTER.

Local storm report, Apr 8, 10:55 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTION
NATIONAL WEATHER SERVICE DES MOINES IA
1055 PM CDT SUN APR 08 2001

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0758 PM    GRIMES                    IA   1 INCH HAIL
04/08/01   POLK                           REPORTED BY STORM
                                          SPOTTER.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 7:05 PM CDT	Severe Thunderstorm Warning	DMX	Jasper	40 min
Apr 8, 7:13 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison	32 min
Apr 8, 7:37 PM CDT	Severe Thunderstorm Warning	DMX	Polk	23 min
Apr 8, 7:46 PM CDT	Severe Thunderstorm Warning	DMX	Jasper	39 min
Apr 8, 7:47 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Polk	38 min
Apr 8, 8:03 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek	42 min
Apr 8, 8:06 PM CDT	Severe Thunderstorm Warning	DMX	Taylor	39 min
Apr 8, 8:06 PM CDT	Severe Thunderstorm Warning	DMX	Polk	39 min
Apr 8, 8:13 PM CDT	Severe Thunderstorm Warning	DMX	Story	42 min
Apr 8, 8:16 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Guthrie	39 min
Apr 8, 8:16 PM CDT	Tornado Warning	DMX	Jasper	29 min
Apr 8, 8:18 PM CDT	Severe Thunderstorm Warning	DMX	Marshall	42 min
Apr 8, 8:21 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	29 min
Apr 8, 8:29 PM CDT	Tornado Warning	DMX	Polk	31 min
Apr 8, 8:30 PM CDT	Tornado Warning	DMX	Adair	20 min
Apr 8, 8:34 PM CDT	Severe Thunderstorm Warning	DMX	Madison, Union	41 min
Apr 8, 8:41 PM CDT	Severe Thunderstorm Warning	DMX	Tama	39 min
Apr 8, 8:44 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin	41 min
Apr 8, 8:46 PM CDT	Tornado Warning	DMX	Jasper	29 min
Apr 8, 8:52 PM CDT	Tornado Warning	DMX	Dallas	38 min
Apr 8, 8:54 PM CDT	Severe Thunderstorm Warning	DMX	Marshall, Story	31 min
Apr 8, 8:56 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	39 min
Apr 8, 8:59 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold, Taylor	41 min
Apr 8, 9:01 PM CDT	Tornado Warning	DMX	Jasper, Marshall	29 min
Apr 8, 9:25 PM CDT	Tornado Warning	DMX	Polk	40 min
Apr 8, 9:27 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur	48 min
Apr 8, 9:29 PM CDT	Tornado Warning	DMX	Marshall, Tama	31 min
Apr 8, 9:31 PM CDT	Tornado Warning	DMX	Clarke, Decatur	49 min
Apr 8, 9:34 PM CDT	Tornado Warning	DMX	Ringgold	31 min
Apr 8, 9:47 PM CDT	Severe Thunderstorm Warning	DMX	Hardin, Marshall	28 min
Apr 8, 10:02 PM CDT	Severe Thunderstorm Warning	DMX	Polk	28 min
Apr 8, 10:20 PM CDT	Flash Flood Warning	DMX	Dallas, Polk	6 hr
Apr 8, 10:22 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur	38 min
Apr 8, 10:26 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	24 min
Apr 8, 10:33 PM CDT	Severe Thunderstorm Warning	DMX	Lucas	47 min
Apr 8, 10:36 PM CDT	Flash Flood Warning	DMX	Ringgold	6 hr
Apr 8, 10:41 PM CDT	Severe Thunderstorm Warning	DMX	Adams	29 min
Apr 8, 10:54 PM CDT	Flash Flood Warning	DMX	Marshall	6 hr
Apr 8, 10:55 PM CDT	Severe Thunderstorm Warning	DMX	Marion	40 min
Apr 8, 10:58 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Wayne	52 min
Apr 8, 11:11 PM CDT	Flash Flood Warning	DMX	Polk, Story	6 hr
Apr 8, 11:37 PM CDT	Severe Thunderstorm Warning	DMX	Union	38 min
Apr 8, 11:39 PM CDT	Tornado Warning	DMX	Wayne	46 min
Apr 9, 12:09 AM CDT	Flash Flood Warning	DMX	Decatur, Ringgold, Taylor	6 hr
Apr 9, 2:21 AM CDT	Severe Thunderstorm Warning	DMX	Appanoose	39 min
Apr 9, 2:27 AM CDT	Flash Flood Warning	DMX	Wayne	4 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2001 Every severe thunderstorm warning in 2001

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.