Alert archive / Iowa / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 117, NWS Des Moines, IA

June 13, 2002Monroe County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 13, 2002, 1:29 AM CDT for Monroe County, Iowa. It was in force for 16 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 13, 2002, 1:29 AM CDT (06:29 UTC)
Expired: Jun 13, 2002, 1:45 AM CDT
In force: 16 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

County Monroe County, IA

The radar

The Des Moines radar (KDMX), 117 km from the middle of the area, began a volume at 06:32 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.5 hours before the alert went out and 201 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: 1544 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 921 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 130629
SVRDSM
IAC135-130645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
129 AM CDT THU JUN 13 2002

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN MONROE COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 145 AM CDT

* AT 127 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER SOUTHEASTERN MONROE COUNTY...OR ABOUT 18
  MILES WEST OF OTTUMWA...MOVING SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  IN RURAL AREAS OF
  SOUTHEASTERN MONROE COUNTY.

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

LARGE HAIL CAN CAUSE INJURY AND PROPERTY DAMAGE. SEEK SAFETY INDOORS
UNTIL THE STORM PASSES.

LAT...LON 4104 9280 4090 9285 4090 9265 4098 9264

MYERS

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, 3:35 PM CDT, 9 hours 54 minutes earlier.

Area forecast discussion, Jun 12, 3:35 PM CDT, 9 hours 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
335 PM CDT WED JUN 12 2002

ACTIVE WEATHER STARTING TO PICK UP OVER THE CWA SO I AM GOING OT
KEEP THIS SHORT.  SLOW MOVING FRONT HAS BECOME PROBLEMATIC OVER THE
CWA.  THE ATMOSPHERE IS JUICED ALONG AND SOUTH OF THE BOUNDARY.  LOW
LEVEL FLOW WL INCRS THIS EVNEING AND INTERACT WITH BOUNDARIES LAID
OUT FROM YESTERDAYS CONVECTION AND THE FRONT.  IN ADDITION STRONG
WIND ALOFT WILL AID IN SUSTAINING THUNDERSTORMS OVER THE CWA AND
HELP THEM TO INTENSIFY.  A SHORT WAVE OVER THE PLAINS WILL PUSH
ACROSS THE CWA THIS EVENING.  STORMS WILL INCREASE OVR MAINLY THE
SRN CWA THIS EVENING...SOUTH OF THE FRONT.  HAIL AND WIND APPEARS TO
BE THE MAIN THREAT BUT WE HAVE BEEN NOTICING SOME ROTATION AT SPIN
UP SO SOME LAND SPOUT TYPE ACTIVITY CANNOT BE RULED OUT.

THE MODELS DO FORECAST THE UPR LOW OVR MT TO PUSH E AND SINK SE AS
IT DOES THIS.  THIS WILL PUSH THE BOUNDARY SOUTH OF THE CWA
OVERNIGHT AND END THE PRECIP.  HEAVY RAINS A POSSIBILITY MAINLY SE
SECTIONS BUT STORMS SHOULD MOVE FAST ENOUGH TO HOLD OFF ANY
WIDESPREAD FLASH FLOOD THREAT.  QUIET AND COOL WEATHER AFTER TONIGHT
AS HIGH BUILDS INTO THE CWA.  NEXT CHANCE OF PRECIP COMES LATE
SUNDAY BUT THERE IS NOT GOOD CONTINUITY IN THE MODELS WITH THE
EXTENDED.  THE MODELS WANT TO MAKE THE PATTERN MORE PROGRESSIVE AND
THAT JUST HASNT BEEN THE CASE IN THE PAST NOT IS IT COMMON FOR THIS
TIME OF YEAR.  AS A RESULT I HAVE TRIED TO FINE TUNE THE PRECIP
TIMING.

.DSM...NONE

FAB

In the hours before

Local storm report, Jun 12, 7:52 PM CDT, 5 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
752 PM CDT WED JUN 12 2002

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

0730 PM    RUNNELLS                  IA   FLOOD
06/12/02   POLK                           COUNTY ENGINEER
                                          REPORTED FLOODING OVER
                                          LOW LYING GRAVEL ROADS
                                          BETWEEN RUNNELLS AND
                                          HWY 163.  BARRICADES
                                          PLACED ACROSS ROADS.

Local storm report, Jun 12, 8:19 PM CDT, 5 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
819 PM CDT WED JUN 12 2002

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

0730 PM    7 SW BEDFORD              IA   1 INCH HAIL
06/12/02   TAYLOR                         REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.
                                          HAIL SWATH WAS
                                          WIDESPREAD.

0730 PM    8 SW BEDFORD              IA   WIND DAMAGE
06/12/02   TAYLOR                         REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.
                                          SEVERAL TREES KNOCKED
                                          DOWN.

Local storm report, Jun 12, 8:53 PM CDT, 4 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
853 PM CDT WED JUN 12 2002

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

0609 PM    2 N ANKENY                IA   1 INCH HAIL
06/12/02   POLK                           REPORTED BY HAM RADIO
                                          OPERATOR.

0610 PM    ANKENY                    IA   1 INCH HAIL
06/12/02   POLK                           REPORTED BY HAM RADIO
                                          OPERATOR.

Local storm report, Jun 12, 11:54 PM CDT, 1 hour 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1154 PM CDT WED JUN 12 2002

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

0730 PM    2 S SIAM                  IA   1 INCH HAIL
06/12/02   TAYLOR                         REPORTED BY EMERGENCY
                                          MANAGEMENT. SEVERAL
                                          MILES STRETCH OF HAIL
                                          DAMAGE. TREES STRIPPED.
                                          ROOFS TORN OFF BARNS.

0730 PM    2 S SIAM                  IA   1 INCH HAIL
06/12/02   TAYLOR                         REPORTED BY EMERGENCY
                                          MANAGEMENT. WIDESPREAD
                                          HAIL DAMAGE TO CROPS.
                                          TREES STRIPPED. ROOFS
                                          TORN OFF BARNS.

1131 PM    BLAKESBURG                IA   1 INCH HAIL
06/12/02   WAPELLO                        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 12, 7:19 PM CDT	Flash Flood Warning	DMX	Marshall	3 hr
Jun 12, 10:36 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek	24 min
Jun 12, 11:22 PM CDT	Severe Thunderstorm Warning	DMX	Wapello	53 min
Jun 12, 11:23 PM CDT	Severe Thunderstorm Warning	DMX	Madison, Warren	67 min
Jun 12, 11:41 PM CDT	Severe Thunderstorm Warning	DMX	Davis	34 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2002 Every severe thunderstorm warning in 2002

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.