Alert archive / Iowa / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 73, NWS Des Moines, IA

June 6, 1999Worth County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 6, 1999, 7:49 PM CDT for Worth County, Iowa. It was in force for 36 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 6, 1999, 7:49 PM CDT (00:49 UTC)
Expired: Jun 6, 1999, 8:25 PM CDT
In force: 36 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Worth County, IA

The radar

The Minneapolis radar (KMPX), 165 km from the middle of the area, began a volume at 00:51 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 6, 7:52 PM CDT	Thunderstorm Wind 50	Manly, 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 6, 6:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.8 hours before the alert went out and 166 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: 8 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 2739 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 6, 2:33 PM CDT, 5 hours 16 minutes earlier.

Area forecast discussion, Jun 6, 2:33 PM CDT, 5 hours 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
233 PM CDT SUN JUN 6 1999

MAIN CONCERN NR TERM TSTM TRENDS.  CONVECTION HAS ALREADY DVLPD FM
SWRN CORNER OF STATE TWRD KADU AND SHOULD CONTINUE FILLING IN
FARTHER N ALG MSTR CNVGNC AXIS...WHICH 18Z SFC ANLYS PLACES JUST AHD
OF WEAK CDFNT ALG KEST-KCBF LN.  SVR POTENTIAL LOOKS GOOD WITH 18Z
LAPS THETA-E ANLYS PLACING BEST CNVGNC N OF CURRENT AREA WITH CAPES
AOA 3500 J/KG.  SHEAR ALSO INCRG WITH H7 50KT SPEED MAX CROSSING MO
RVR PER RECENT PROFILER DATA.  MDLS IN GENERAL AGREEMENT PUSHING
CNVGNC AREA SLOWLY ACRS FA TNGT THEN TO E BY 12Z ENDING PCPN
THREAT.  LCLLY HVY RAINS WL FALL WITH SOME TSTMS TRAINING SW TO NE
BUT AREAL CVRG SHOULD BE LTD ENOUGH TO PRECLUDE WDSPRD HVY RAINS.
FLASH FLOOD GUID HAS ALSO REBOUNDED OVR MUCH OF CWA XCP TWRD MN
BORDER WHICH SAW SVRL INCHES LAST NGT SO WL HOLD OFF ON FLASH FLOOD
WATCH ATTM (COORD W/DVN).   SVR WX SEEMS TO BE GREATER THREAT.

THERMAL TROF SLIDES ACRS IA EARLY MON...THEN WRM AND HUMID AMS MAKES
A QUICK RTRN FOR LATER PDS.  UPR LOW OVR SD LIFTS QUICKLY NEWD AND
YET ANOTHER LG WV TROF SETTLES INTO WRN U.S WITH RDG BUILDING INTO
GTLKS KEEPING FA DRY THRU 72 HRS.  SOME WEAK LOW LVL CNVGNC NOTED
BUT NOT ENOUGH TO BUCK CONTINUITY OF GOING FCST.  MAIN WX FEATURE
WL BE SUMMERY...MUGGY AND STAGNANT AMS.

FOR EXTENDED PD...MDLS SEEM TO BE IN GENERAL AGREEMENT WITH
PERSISTENT LG WV PTN KEEPING IA BTWN WRN TROF AND ERN RDG ON SRN
FRINGE OF SWLY UPR LVL FLOW.  HWVR PTN IS JUST PROGRESSIVE ENOUGH TO
BRING FNT INTO FA BY THU AND FRI WITH POTENTIAL FOR MORE LCLLY HVY
RAINS.  THERE COULD BE A WEAK SHRT WV PASSING THRU RGN ON WED BUT
WITH LTL SFC CNVGNC NOTED AND BACLIN ZN TO NW...WL LEAVE FCST DRY
FOR NOW.

.DSM...NONE

SMALL

In the hours before

Local storm report, Jun 6, 5:28 PM CDT, 2 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
528 PM CDT SUN JUN 06 1999

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

0223 PM    KIMBALLTON                IA    60 MPH TSTM GUST
06/06/99   AUDUBON

0300 PM    GILMORE CITY              IA    1.5 INCH HAIL
06/06/99   POCAHONTAS                      FROM KCCI TV

0315 PM    MANSON                    IA    .75 INCH HAIL
06/06/99   CALHOUN                         FROM NWS SPOTTER

0322 PM    SCRANTON                  IA    .75 INCH HAIL
06/06/99   GREENE                          FROM NWS SPOTTER

0335 PM    ALGONA MUNI ARPT          IA    1.5 INCH HAIL
06/06/99   KOSSUTH

0338 PM    5 N ALGONA                IA    1 INCH HAIL
06/06/99   KOSSUTH                         2 TO 3 MILE WIDE SWATH

0340 PM    2 S OTHO                  IA    TORNADO
06/06/99   WEBSTER

0350 PM    OTHO                      IA    TORNADO
06/06/99   WEBSTER

0350 PM    DUNCOMBE                  IA    65 MPH TSTM GUST
06/06/99   WEBSTER                         FROM NWS SPOTTER

0350 PM    WHITTEMORE                IA    1.75 INCH HAIL
06/06/99   KOSSUTH                         FROM KCID RADIO

0353 PM    BANCROFT                  IA    1.75 INCH HAIL
06/06/99   KOSSUTH                         FROM KOSSUTH COUNTY
                                           SHERIFF

0410 PM    10 S CLARION              IA    TORNADO
06/06/99   WRIGHT                          PUBLIC REPORT

0419 PM    BELMOND                   IA    TORNADO
06/06/99   WRIGHT                          FROM WRIGHT COUNTY
                                           SHERIFF

0427 PM    1 SE GARNER               IA    TORNADO
06/06/99   HANCOCK                         POSSIBLE TORNADO...FROM
                                           GARNER POLICE DEPT

0430 PM    1 SE DOWS                 IA    TORNADO
06/06/99   FRANKLIN                        PUBLIC REPORT

0441 PM    5 W HAMPTON               IA    TORNADO
06/06/99   FRANKLIN

0446 PM    3 S MASON CITY            IA    TORNADO
06/06/99   CERROGORDO                      PUBLIC REPORT

0450 PM    5 NE ROCKWELL             IA    60 MPH TSTM GUST
06/06/99   CERROGORDO

SMALL

Local storm report, Jun 6, 5:28 PM CDT, 2 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
528 PM CDT SUN JUN 06 1999

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

0223 PM    KIMBALLTON                IA    60 MPH TSTM GUST
06/06/99   AUDUBON

0300 PM    GILMORE CITY              IA    1.5 INCH HAIL
06/06/99   POCAHONTAS                      FROM KCCI TV

0315 PM    MANSON                    IA    .75 INCH HAIL
06/06/99   CALHOUN                         FROM NWS SPOTTER

0322 PM    SCRANTON                  IA    .75 INCH HAIL
06/06/99   GREENE                          FROM NWS SPOTTER

0335 PM    ALGONA MUNI ARPT          IA    1.5 INCH HAIL
06/06/99   KOSSUTH

0338 PM    5 N ALGONA                IA    1 INCH HAIL
06/06/99   KOSSUTH                         2 TO 3 MILE WIDE SWATH

0340 PM    2 S OTHO                  IA    TORNADO
06/06/99   WEBSTER

0350 PM    OTHO                      IA    TORNADO
06/06/99   WEBSTER

0350 PM    DUNCOMBE                  IA    65 MPH TSTM GUST
06/06/99   WEBSTER                         FROM NWS SPOTTER

0350 PM    WHITTEMORE                IA    1.75 INCH HAIL
06/06/99   KOSSUTH                         FROM KCID RADIO

0353 PM    BANCROFT                  IA    1.75 INCH HAIL
06/06/99   KOSSUTH                         FROM KOSSUTH COUNTY
                                           SHERIFF

0410 PM    10 S CLARION              IA    TORNADO
06/06/99   WRIGHT                          PUBLIC REPORT

0419 PM    BELMOND                   IA    TORNADO
06/06/99   WRIGHT                          FROM WRIGHT COUNTY
                                           SHERIFF

0427 PM    1 SE GARNER               IA    TORNADO
06/06/99   HANCOCK                         POSSIBLE TORNADO...FROM
                                           GARNER POLICE DEPT

0430 PM    1 SE DOWS                 IA    TORNADO
06/06/99   FRANKLIN                        PUBLIC REPORT

0441 PM    5 W HAMPTON               IA    TORNADO
06/06/99   FRANKLIN

0446 PM    3 S MASON CITY            IA    TORNADO
06/06/99   CERROGORDO                      PUBLIC REPORT

0450 PM    5 NE ROCKWELL             IA    60 MPH TSTM GUST
06/06/99   CERROGORDO

SMALL

Local storm report, Jun 6, 5:52 PM CDT, 1 hour 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
552 PM CDT SUN JUN 06 1999

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

0544 PM    AUDUBON ARPT              IA    60 MPH TSTM GUST
06/06/99   AUDUBON                         FROM AUDUBON AWOS

SMALL

Local storm report, Jun 6, 5:52 PM CDT, 1 hour 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
552 PM CDT SUN JUN 06 1999

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

0544 PM    AUDUBON ARPT              IA    60 MPH TSTM GUST
06/06/99   AUDUBON                         FROM AUDUBON AWOS

SMALL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 6, 7:08 PM CDT	Tornado Warning	DMX	Hamilton	32 min
Jun 6, 7:31 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo	34 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1999 Every severe thunderstorm warning in 1999

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.