Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 65, NWS Des Moines, IA

June 20, 1996Dallas County, Madison County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 20, 1996, 10:16 AM CDT for Dallas County, Madison County, Iowa. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 20, 1996, 10:16 AM CDT (15:16 UTC)
Expired
Jun 20, 1996, 11:00 AM CDT
In force
44 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Dallas County, IA, Madison County, IA

The radar

The Des Moines radar (KDMX), 35 km from the middle of the area, began a volume at 15:19 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

Omaha, NE (KOAX), launched 12:00Z, 3.3 hours before the alert went out and 196 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 1996-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2885 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 1996-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2885 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
717 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
0.0
Supercell composite
10.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDSM 201516
SVRDSM
IAC049-121-201600-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1016 AM CDT THU JUN 20 1996

* SEVERE THUNDERSTORM WARNING FOR
  DALLAS COUNTY - CENTRAL IOWA
  NORTHERN MADISON COUNTY - SOUTH CENTRAL IOWA

* UNTIL 1100 AM CDT
 
* SOME LOCATIONS AFFECTED
    PERRY
    DALLAS CENTER
    ADEL
    EARLHAM

* AT 1014 AM CDT RADAR INDICATED A LINE SEVERE THUNDERSTORMS FROM
  PANORA TO JUST SOUTH OF STUART 40 MILES WEST OF DES MOINES MOVING
  EAST AT 40 MPH.

* THE STORM WILL BE THE HIGHWAY 169 CORRIDOR BY 1040 AM.
 
THIS STORM HAS A HISTORY OF PRODUCING WIND DAMAGE. TAKE IT SERIOUSLY
AND HEAD INDOORS IMMEDIATELY. ONE INCH DIAMETER WAS ALSO REPORTED
JUST NORTHEAST OF GUTHRIE CENTER AT 1015 AM.

PYTLAK

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.

In the hours before

Special weather statement, Jun 20, 5:41 AM CDT, 4 hours 35 minutes before
IAZ004>011-015>019-023>030-033>042-044>054-057>064-070>078-081>089-
092>099-201130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
535 AM CDT THU JUN 20 1996

...PARTS OF SEVERE THUNDERSTORM WATCH NUMBER 646 HAS BEEN CANCELLED...

THE STORMS WHICH HAVE HAD A HISTORY OF PRODUCING SEVERE WEATHER HAVE
MOVED SOUTH...THEREFORE THE WATCH HAS BEEN CANCELLED FOR NORTHERN
PORTIONS OF THE WATCH. THOSE COUNTIES CLEARED FROM THE WATCH INCLUDE
EMMET...KOSSUTH...PALO ALTO...POCOHONTAS...HUMBOLT...SAC...CALHOUN...
WEBSTER...CRAWFORD...CARROLL...AND GREEN.

THE REMAINDER OF THE COUNTIES INCLUDED IN THE SEVERE THUNDERSTORM
ARE STILL UNDER THE WATCH UNTIL 700 AM CDT. STAY TUNED FOR LATER

STATEMENTS.

HUNTER
Special weather statement, Jun 20, 7:06 AM CDT, 3 hours 10 minutes before
IAZ004>011-015>019-023>030-033>042-044>054-057>064-070>078-081>089-
092>099-201130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
700 AM CDT THU JUN 20 1996

...THE THUNDERSTORM WATCH WHICH WAS IN EFFECT UNTIL 700 AM CDT HAS
EXPIRED...

THE STORMS WHICH PRODUCED SEVERE WEATHER OVERNIGHT HAVE
WEAKENED...THUS THE SEVERE THUNDERSTORM WATCH NUMBER 646 HAS BEEN
ALLOWED TO EXPIRE. SCATTERED THUNDERSTORMS PRODUCING HEAVY
RAIN...BRIEFv GUSTY WINDS AND POSSIBLY SMALL HAIL WILL CONTINUE OVER
THE AREA THIS MORNING...HOWEVER NO SEVERE WEATHER IS EXPECTED. STAY
TUNED TO NOAA WEATHER RADIO FOR ANY UPDATES.

HUNTER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 11:44 PM CDTSevere Thunderstorm WarningDMXSac31 min
Jun 20, 12:39 AM CDTSevere Thunderstorm WarningDMXSac21 min
Jun 20, 1:00 AM CDTSevere Thunderstorm WarningDMXCrawford25 min
Jun 20, 1:16 AM CDTFlash Flood WarningDMXSac3 hr
Jun 20, 1:23 AM CDTSevere Thunderstorm WarningDMXCrawford32 min
Jun 20, 9:25 AM CDTSevere Thunderstorm WarningDMXAudubon, Cass30 min
Jun 20, 9:49 AM CDTSevere Thunderstorm WarningDMXAdair, Guthrie41 min
Jun 20, 10:36 AM CDTSevere Thunderstorm WarningDMXPolk, Warren39 min
Jun 20, 10:51 AM CDTSevere Thunderstorm WarningDMXMadison, Union29 min
Jun 20, 1:18 PM CDTFlash Flood WarningDMXAudubon3 hr
Jun 20, 4:23 PM CDTSevere Thunderstorm WarningDMXCrawford37 min
Jun 20, 5:11 PM CDTSevere Thunderstorm WarningDMXCrawford34 min
Jun 20, 5:32 PM CDTSevere Thunderstorm WarningDMXCrawford43 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1996Every severe thunderstorm warning in 1996

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.