Alert archive / Iowa / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 209, NWS Des Moines, IA

June 12, 2001Boone County, Dallas County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 12, 2001, 12:08 PM CDT for Boone County, Dallas County, Iowa. It was in force for 42 min. 4 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 12, 2001, 12:08 PM CDT (17:08 UTC)
Expired: Jun 12, 2001, 12:50 PM CDT
In force: 42 min
Issued by: NWS Des Moines, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Boone County, IA, Dallas County, IA

The radar

The Des Moines radar (KDMX), 31 km from the middle of the area, began a volume at 17:11 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
Jun 12, 12:27 PM CDT	Hail 1	Madrid, IA
Jun 12, 12:28 PM CDT	Hail 1	Woodward, IA
Jun 12, 12:31 PM CDT	Hail 1	Woodward, IA
Jun 12, 12:32 PM CDT	Hail 1	Woodward, 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
Jun 12, 11:30 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 5.1 hours before the alert went out and 202 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: 2590 J/kg
Mixed-layer CIN: -222 J/kg
Mixed-layer LCL: 793 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 121708
SVRDSM
IAC015-049-121750-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1208 PM CDT TUE JUN 12 2001

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN BOONE COUNTY IN CENTRAL IOWA
  NORTHERN DALLAS COUNTY IN CENTRAL IOWA

* UNTIL 1250 PM CDT

* AT 1206 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER PERRY...OR ABOUT 33 MILES NORTHWEST OF DES
  MOINES...MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  NEAR WOODWARD AROUND 1230 PM
  8 MILES SOUTHWEST OF MADRID AROUND 1250 PM

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

A SEVERE THUNDERSTORM CAN PRODUCE HAIL LARGER THAN THREE QUARTERS OF
AN INCH AND WINDS IN EXCESS OF 58 MPH.

PLEASE REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY
FOR RELAY TO THE NATIONAL WEATHER SERVICE OFFICE NEAR DES MOINES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM TUESDAY
AFTERNOON FOR SOUTHWESTERN IOWA.

LAT...LON 4198 9417 4169 9426 4169 9382 4199 9382

JOHNSON

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 Jun 12, 3:10 AM CDT, 8 hours 58 minutes earlier.

Area forecast discussion, Jun 12, 3:10 AM CDT, 8 hours 58 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
310 AM CDT TUE JUN 12 2001

FORECAST CHALLENGES WITH CAP AND THEREFORE EXTENT OF CONVECTION ACRS
CWA DURING THE NEXT 48 TO 60 HOURS.  CURRENTLY...CONVECTION RIDING
ALONG SFC BOUNDARY CONTINUES TO PRESS TO THE EAST WITH BEST LOW
LEVEL INFLOW.  ANOTHER AREA OF TSRA HAVE DEVELOPED ACRS SW NEBRASKA
WHERE LOW LEVEL CONVERGENCE HAS INCREASED ALONG FRONTAL BOUNDARY.
OTHERWISE...STRONG CAP HAS HELD ACRS THE SOUTHERN TWO-THIRDS OF THE
CWA TONIGHT WITH TEMPS IN THE MID TO UPPER 70S AND RATHER HIGH
DEWPOINTS.

STALLED BOUNDARY ACRS THE CWA WILL BEGIN TO MOVE NORTH DURING THE
DAY WITH INCREASING WAA.  MODELS INDICATE THAT CONVECTION WL ONCE
AGAIN FIRE ACRS N IA ON THE EDGE OF THE CAP DURING THE DAY AS LOW
LEVEL FLOW BACKS.  ANY SUNSHINE THIS MORNING WL LEAD TO RAPID
DESTABILIZATION AND SEVERE CONVECTION REMAINS A DISTINCT
POSSIBILITY.  FARTHER SOUTH...CAP SHOULD HOLD IN THE WARM SECTOR WITH
WARM TEMPS INTO THE 90S AGAIN.

STATE TO BE IN WARM SECTOR OVERNIGHT WITH ONLY CHANCE OF CONVECTION
IN THE NORTH WITH CAP HOLDING ELSEWHERE.  LOWS TO REMAIN QUITE WARM
WITH READINGS IN THE 70S.  NEXT CHANCE FOR PCPN SHOULD COME LATER ON
WEDNESDAY AS COOLER MID LEVEL TEMPS MOVE INTO IA WITH UPPER LOW
PULLING INTO NORTHERN PLAINS.  EXPECT TEMPS TO BE NEAR 90 WITH
HUMID CONDITIONS CONTINUING.  FRONTAL BOUNDARY MOVES SLOWLY ACRS ON
WEDNESDAY NIGHT WITH CONVECTION BECOMING MORE LIKELY.  NO CHANGES TO
EXTENDED AT THIS TIME.

.DSM...NONE

COGIL

In the hours before

Local storm report, Jun 12, 7:28 AM CDT, 4 hours 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
728 AM CDT TUE JUN 12 2001

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

0640 AM    CLIVE                     IA   1.75 INCH HAIL
06/12/01   POLK                           REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0644 AM    URBANDALE                 IA   1.75 INCH HAIL
06/12/01   POLK                           REPORTED BY STORM
                                          SPOTTER.

0653 AM    CLIVE                     IA   1.75 INCH HAIL
06/12/01   POLK                           REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0658 AM    WAUKEE                    IA   .75 INCH HAIL
06/12/01   DALLAS                         REPORTED BY OFF-DUTY
                                          NWS EMPLOYEE.

0705 AM    5 N bNEWTON                IA   .88 INCH HAIL
06/12/01   JASPER                         REPORTED BY STORM
                                          SPOTTER.

Local storm report, Jun 12, 8:17 AM CDT, 3 hours 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
817 AM CDT TUE JUN 12 2001

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

0630 AM    CLIVE                     IA   1.75 INCH HAIL
06/12/01   POLK                           REPORTED BY OFF-DUTY
                                          NWS EMPLOYEE.

0631 AM    WEST DES MOINES           IA   1.75 INCH HAIL
06/12/01   POLK                           REPORTED BY  WHO TV.

0635 AM    WEST DES MOINES           IA   1.75 INCH HAIL
06/12/01   POLK                           REPORTED BY WOI TV.

0635 AM    URBANDALE                 IA   1 INCH HAIL
06/12/01   POLK                           REPORTED BY STORM
                                          SPOTTER.

0645 AM    URBANDALE                 IA   1.5 INCH HAIL
06/12/01   POLK                           REPORTED BY STORM
                                          SPOTTER.

Local storm report, Jun 12, 9:04 AM CDT, 3 hours 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
904 AM CDT TUE JUN 12 2001

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

0900 AM    4 N KNOXVILLE             IA   1 INCH HAIL
06/12/01   MARION                         REPORTED BY STORM
                                          SPOTTER.

0903 AM    PELLA                     IA   .88 INCH HAIL
06/12/01   MARIOJN

Local storm report, Jun 12, 9:07 AM CDT, 3 hours 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
907 AM CDT TUE JUN 12 2001

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

0841 AM    HARTFORD                  IA   1 INCH HAIL
06/12/01   WARREN                         REPORTED BY OFF-DUTY
                                          NWS EMPLOYEE.

0905 AM    RED ROCK                  IA   1 INCH HAIL
06/12/01   MARION                         REPORTED BY STORM
                                          SPOTTER.

Local storm report, Jun 12, 11:38 AM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1138 AM CDT TUE JUN 12 2001

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

0847 AM    1 S PRAIRIE CITY          IA   WIND DAMAGE
06/12/01   JASPER                         TREE DOWN. REPORTED BY
                                          STORM SPOTTER.

0939 AM    ANKENY                    IA   1.75 INCH HAIL
06/12/01   POLK

0948 AM    1 N KNOXVILLE             IA   1 INCH HAIL
06/12/01   MARION                         REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0955 AM    LAUREL                    IA   1.75 INCH HAIL
06/12/01   MARSHALL                       REPORTED BY MEDIA.

0959 AM    1 W BAXTER                IA   1 INCH HAIL
06/12/01   JASPER                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

1000 AM    MAXWELL                   IA   .75 INCH HAIL
06/12/01   STORY                          REPORTED BY STORM
                                          SPOTTER.

1005 AM    COLLINS                   IA   1 INCH HAIL
06/12/01   STORY                          REPORTED BY MEDIA.

1015 AM    3 W ALLEMAN               IA   .75 INCH HAIL
06/12/01   POLK                           REPORTED BY STORM
                                          SPOTTER.

1020 AM    11 SE GALESBURG           IA   1.25 INCH HAIL
06/12/01   JASPER                         REPORTED BY STORM
                                          SPOTTER.

1035 AM    4 SW STATE CENTER         IA   .75 INCH HAIL
06/12/01   MARSHALL                       REPORTED BY STORM
                                          SPOTTER.

1052 AM    2 S STATE CENTER          IA   1.75 INCH HAIL
06/12/01   MARSHALL                       REPORTED BY MEDIA.

1055 AM    LYNNVILLE                 IA   1.75 INCH HAIL
06/12/01   JASPER                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

1113 AM    5 S BERKLEY               IA   1.75 INCH HAIL
06/12/01   BOONE                          REPORTED BY MEDIA.

1123 AM    6 N SEARSBORO             IA   .75 INCH HAIL
06/12/01   POWESHIEK                      ROOF DAMAGE REPORTED BY
                                          STORM SPOTTER.

1125 AM    5 S MONTEZUMA             IA   TORNADO
06/12/01   POWESHIEK                      REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

1132 AM    2 SE SCRANTON             IA   .75 INCH HAIL
06/12/01   GREENE                         REPORTED BY HAM RADIO
                                          OPERATOR.

Local storm report, Jun 12, 11:50 AM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1150 AM CDT TUE JUN 12 2001

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

1125 AM    5 W MONTEZUMA             IA   TORNADO
06/12/01   POWESHIEK                      TORNADO WAS 5 MILES
                                          WEST (CORRECTION FOR
                                          DIRECTION)  OF
       Q                                   MONTEZUMA. REPORTED BY
                                          LAW ENFORCEMENT OFFICIAL.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 10:06 PM CDT	Severe Thunderstorm Warning	DMX	Pocahontas	44 min
Jun 11, 10:54 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto	51 min
Jun 11, 11:45 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto	45 min
Jun 12, 5:38 AM CDT	Severe Thunderstorm Warning	DMX	Marshall	32 min
Jun 12, 6:23 AM CDT	Severe Thunderstorm Warning	DMX	Tama	47 min
Jun 12, 6:34 AM CDT	Severe Thunderstorm Warning	DMX	Polk	41 min
Jun 12, 6:35 AM CDT	Severe Thunderstorm Warning	DMX	Dallas	30 min
Jun 12, 6:41 AM CDT	Severe Thunderstorm Warning	DMX	Jasper	44 min
Jun 12, 7:24 AM CDT	Severe Thunderstorm Warning	DMX	Jasper	31 min
Jun 12, 8:33 AM CDT	Severe Thunderstorm Warning	DMX	Warren	22 min
Jun 12, 8:42 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion	28 min
Jun 12, 8:59 AM CDT	Severe Thunderstorm Warning	DMX	Marion	41 min
Jun 12, 9:02 AM CDT	Severe Thunderstorm Warning	DMX	Jasper	38 min
Jun 12, 9:06 AM CDT	Severe Thunderstorm Warning	DMX	Mahaska	39 min
Jun 12, 9:25 AM CDT	Severe Thunderstorm Warning	DMX	Greene, Guthrie	40 min
Jun 12, 9:31 AM CDT	Severe Thunderstorm Warning	DMX	Polk	19 min
Jun 12, 9:38 AM CDT	Severe Thunderstorm Warning	DMX	Jasper	42 min
Jun 12, 9:45 AM CDT	Severe Thunderstorm Warning	DMX	Marion	30 min
Jun 12, 9:50 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas	40 min
Jun 12, 9:57 AM CDT	Severe Thunderstorm Warning	DMX	Marshall, Polk, Story	38 min
Jun 12, 10:03 AM CDT	Severe Thunderstorm Warning	DMX	Greene	32 min
Jun 12, 10:19 AM CDT	Severe Thunderstorm Warning	DMX	Jasper	21 min
Jun 12, 10:27 AM CDT	Severe Thunderstorm Warning	DMX	Boone	28 min
Jun 12, 10:38 AM CDT	Severe Thunderstorm Warning	DMX	Marshall	32 min
Jun 12, 10:41 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Poweshiek	29 min
Jun 12, 10:54 AM CDT	Severe Thunderstorm Warning	DMX	Boone	41 min
Jun 12, 11:09 AM CDT	Severe Thunderstorm Warning	DMX	Poweshiek	41 min
Jun 12, 11:13 AM CDT	Severe Thunderstorm Warning	DMX	Dallas	42 min
Jun 12, 11:17 AM CDT	Tornado Warning	DMX	Poweshiek	28 min
Jun 12, 11:18 AM CDT	Severe Thunderstorm Warning	DMX	Greene	42 min
Jun 12, 11:24 AM CDT	Severe Thunderstorm Warning	DMX	Hardin	21 min
Jun 12, 11:50 AM CDT	Severe Thunderstorm Warning	DMX	Crawford	40 min
Jun 12, 11:57 AM CDT	Severe Thunderstorm Warning	DMX	Greene	28 min
Jun 12, 12:02 PM CDT	Tornado Warning	DMX	Crawford	28 min
Jun 12, 12:11 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek	39 min
Jun 12, 12:22 PM CDT	Severe Thunderstorm Warning	DMX	Polk	38 min
Jun 12, 12:25 PM CDT	Severe Thunderstorm Warning	DMX	Greene	30 min
Jun 12, 12:28 PM CDT	Tornado Warning	DMX	Crawford	32 min
Jun 12, 12:46 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek, Tama	39 min
Jun 12, 12:48 PM CDT	Severe Thunderstorm Warning	DMX	Carroll	42 min
Jun 12, 1:22 PM CDT	Severe Thunderstorm Warning	DMX	Greene	28 min
Jun 12, 1:44 PM CDT	Severe Thunderstorm Warning	DMX	Jasper	41 min
Jun 12, 1:51 PM CDT	Flash Flood Warning	DMX	Boone, Story	3 hr
Jun 12, 1:51 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun	39 min
Jun 12, 2:08 PM CDT	Severe Thunderstorm Warning	DMX	Polk	42 min
Jun 12, 2:12 PM CDT	Flash Flood Warning	DMX	Greene	2 hr
Jun 12, 2:29 PM CDT	Flash Flood Warning	DMX	Jasper, Polk	3 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.