Alert archive / Iowa / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 42, NWS Des Moines, IA

April 9, 2001Appanoose County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 9, 2001, 2:21 AM CDT for Appanoose County, Iowa. It was in force for 39 min. No storm report in the archive falls 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.

The facts

Issued: Apr 9, 2001, 2:21 AM CDT (07:21 UTC)
Expired: Apr 9, 2001, 3:00 AM CDT
In force: 39 min
Issued by: NWS Des Moines, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Appanoose County, IA

The radar

The Des Moines radar (KDMX), 126 km from the middle of the area, began a volume at 07:22 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.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.4 hours before the alert went out and 223 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: 455 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1962 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 356 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 090721
SVRDSM
IAC007-090800-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
221 AM CDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  APPANOOSE COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 300 AM CDT

* AT 217 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE
  OF SEVERE THUNDERSTORMS FROM 11 MILES NORTH OF CENTERVILLE TO 14
  MILES SOUTHWEST OF CENTERVILLE...OR FROM 28 MILES WEST OF OTTUMWA
  TO 45 MILES SOUTHWEST OF OTTUMWA...MOVING EAST AT 55 MPH.

* SEVERE THUNDERSTORMS WILL BE...
  NEAR CENTERVILLE AROUND 230 AM

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

SEVERE THUNDERSTORMS CAN DAMAGE MOBILE HOMES...SEEK MORE SUBSTANTIAL
SHELTER.

LAT...LON 4088 9309 4060 9309 4060 9264 4090 9266

JUNGBLUTH

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, 5 hours 23 minutes earlier.

Area forecast discussion, Apr 8, 8:58 PM CDT, 5 hours 23 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, 10:55 PM CDT, 3 hours 26 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.

Local storm report, Apr 8, 11:34 PM CDT, 2 hours 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1134 PM CDT SUN APR 08 2001

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

0701 PM    HARTFORD                  IA   1 INCH HAIL
04/08/01   WARREN                         REPORTED BY STORM
                                          SPOTTER.

0927 PM    6 S MARSHALLTOWN          IA   .88 INCH HAIL
04/08/01   MARSHALL                       REPORTED BY STORM
                                          SPOTTER.

0930 PM    GRIMES                    IA   1 INCH HAIL
04/08/01   POLK                           REPORTED BY STORM
                                          SPOTTER.

0938 PM    5 W LAMONI                IA   TORNADO
04/08/01   DECATUR                        REPORTED BY STORM
                                          SPOTTER.

1005 PM    3 N GRAND RIVER           IA   1 INCH HAIL
04/08/01   DECATUR                        REPORTED BY STORM
                                          SPOTTER.

1029 PM    MT AYR                    IA   1 INCH HAIL
04/08/01   RINGGOLD                       REPORTED BY LAW
                   0                       ENFORCEMENT OFFICIAL.

1044 PM    KELLERTON                 IA   1 INCH HAIL
04/08/01   RINGGOLD                       REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

Local storm report, Apr 9, 12:05 AM CDT, 2 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1205 AM CDT MON APR 09 2001

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

1136 PM    6 S HUMESTON              IA   .88 INCH HAIL
04/08/01   WAYNE                          REPORTED BY STORM
                                          SPOTTER.

1156 PM    3 W MILLERTON             IA   1.75 INCH HAIL
04/08/01   WAYNE                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

Local storm report, Apr 9, 12:23 AM CDT, 1 hour 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1223 AM CDT MON APR 09 2001

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

0714 PM    RUNNELLS                  IA   1 INCH HAIL
04/08/01   POLK                           REPORTED BY HAM RADIO
                                          OPERATOR.

0812 PM    URBANDALE                 IA   .75 INCH HAIL
04/08/01   POLK                           REPORTED BY HAM RADIO
                                          OPERATOR.

0838 PM    MAXWELL                   IA   1 INCH HAIL
04/08/01   STORY                          REPORTED BY HAM RADIO
                                          OPERATOR.

0919 PM    3 W WAUKEE                IA   1.75 INCH HAIL
04/08/01   DALLAS                         REPORTED BY HAM RADIO
                                          OPERATOR.

1025 PM    MT AYR                    IA   .88 INCH HAIL
04/08/01   RINGGOLD                       REPORTED BY EMERGENCY
                                          MANAGEMENT.

1110 PM    ORIENT                    IA   .88 INCH HAIL
04/08/01   ADAIR                          REPORTED BY FIRE AND
                                          RESCUE.

1111 PM    LEON                      IA   70 MPH TSTM GUST
04/08/01   DECATUR                        REPORTED BY STORM
                                          SPOTTER.s

Local storm report, Apr 9, 12:47 AM CDT, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1247 AM CDT MON APR 09 2001

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

1111 PM    LEON                      IA   WIND DAMAGE
04/08/01   DECATUR                        *** 2 INJ ***
                                          MOBILE HOME OVERTURNED
                                          AND TWO OCCUPANTS
                                          INSIDE WERE INJURED AND
                                          HOSPITALIZED. REPORTED
                                          BY LAW ENFORCEMENT
                                          OFFICIAL.

Special weather statement, Apr 9, 1:26 AM CDT, 55 minutes before

IAZ034>039-045>050-057>062-070>075-081>086-092>097-090715-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
126 AM CDT MON APR 9 2001

            ...TORNADO WATCH #103 HAS EXPIRED...

TORNADO WATCH NUMBER 103 THAT WAS IN EFFECT FOR PORTIONS OF CENTRAL
AND SOUTHERN IOWA HAS EXPIRED.  NO SEVERE WEATHER WATCHES ARE
CURRENTLY IN EFFECT FOR THE DES MOINES NATIONAL WEATHER SERVICE
FORECAST AREA.  STRONG THUNDERSTORMS WILL CONTINUE THROUGH MUCH OF
THE NIGHT ACROSS SOUTHERN IOWA...BUT THEY SHOULD MAINLY BE BELOW
SEVERE LIMITS.  HOWEVER...SOME OF THE STORMS MAY STILL PRODUCE SMALL
HAIL AND WIND GUSTS TO 50 MPH.

HEAVY RAIN WILL BE THE MAIN THREAT.  A FLASH FLOOOD WATCH REMAINS IN
EFFECT FOR MUCH OF CENTRAL AND SOUTHERN IOWA OVERNIGHT.

MONITOR THE LATEST NATIONAL WEATHER SERVICE STATEMENTS AND FORECASTS
FOR UPDATED INFORMATION.

SMALL

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, 10:57 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Union	38 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, 2:27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.