Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 76, NWS Sioux Falls, SD

June 20, 1996Plymouth County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 20, 1996, 3:04 PM CDT for Plymouth County, Iowa. It was in force for 46 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, 3:04 PM CDT (20:04 UTC)
Expired: Jun 20, 1996, 3:50 PM CDT
In force: 46 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Plymouth County, IA

The radar

The Sioux Falls radar (KFSD), 103 km from the middle of the area, began a volume at 20:08 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, 8.1 hours before the alert went out and 158 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: 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 KFSD 202005
SVRFSD
IAC149-202050-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
304 PM CDT THU JUN 20 1996

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS SD HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 350 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWEST IOWA

   ...PLYMOUTH COUNTY
 
AT 300 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY SIOUX FALLS
DOPPLER RADAR 20 MILES NORTHWEST OF SIOUX CITY NEAR WESTFIELD MOVING
EAST AT 35 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
AKRON                    AROUND 310 PM CDT
RUBLE                    AROUND 320 PM CDT
CRAIG  AND MERRILL       AROUND 33- PM CDT
LE MARS AND STRUBLE      AROUND 340 PM CDT

UMLAND/VETTER
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG...REINFORCED BUILDING.  DAMAGING WIND...LARGE HAIL...VERY
HEAVY RAIN AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE
THUNDERSTORMS. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS
PASSED.

MARBLE SIZE HAIL WAS REPORTED NORTH OF ELK POINT SOUTH DAKOTA.
&

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, 10:12 AM CDT, 4 hours 52 minutes before

IAZ031-032-NEZ013-014-201715-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1012 AM CDT THU JUN 20 1996

...SEVERE THUNDERSTORM WATCH CANCELED EXTREME NORTHWEST PARTS OF
NEBRASKA AND IOWA...

THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELED FOR DAKOTA AND DIXON
COUNTIES IN EXTREME NORTHEAST NEBASKA AND FOR WOODBURY AND IDA COUNTIES
OF NORTHWEST IOWA.

SEVERE THUNDERSTORMS ARE NO LONGER A THREAT IN THESE AREAS FOR NOW.

UMLAND

Special weather statement, Jun 20, 11:01 AM CDT, 4 hours 3 minutes before

IAZ001>003-012>014-020>022-031-032-MNZ072-097-NEZ013-014-SDZ009>011-
015>023-033>040-046>071-210000-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1059 AM CDT THU JUN 20 1996

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
TONIGHT ACROSS CENTRAL AND EASTERN SOUTH DAKOTA...SOUTHWEST
MINNESOTA...NORTHWEST IOWA AND NORTHEAST NEBRASKA. A STRONG UPPER
LEVEL SYSTEM WILL BE MOVING ACROSS SOUTHERN SOUTH DAKOTA THIS
AFTERNOON AND TONIGHT AND WILL INTERACT WITH A FRONT ACROSS NEBRASKA
AND IOWA TO PRODUCE THUNDERSTORMS ACROSS THE AREA THIS AFTERNOON
AND TONIGHT. SOME OF THESE STORMS WILL LIKELY BECOME SEVERE.

STRONG THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS CENTRAL SOUTH
DAKOTA THIS AFTERNOON AND WILL SPREAD EAST THROUGH THE LATE
AFTERNOON AND NIGHT. THE MAIN SEVERE WEATHER THREATS WILL BE
LARGE HAIL...AND GUSTY WINDS...BUT THE WIND PATTERNS WILL BE ALSO
SOMEWHAT FAVORABLE FOR ISOLATED TORNADOES.

PER:SONS ACROSS CENTRAL AND EASTERN SOUTH DAKOTA...SOUTHWEST
MINNESOTA...NORTHWEST IOWA AND NORTHEAST NEBRASKA SHOULD KEEP
ABREAST OF THIS POTENTIALLY DANGEROUS WEATHER SITUATION AS CONDITIONS
MAY RAPIDLY CHANGE LATER THIS AFTERNOON AND TONIGHT.

Local storm report, Jun 20, 1:59 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT...PART 3
NATIONAL WEATHER SERVICE  SIOUX FALLS SD
207 AM CDT THU JUN 20 1996

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

0910 PM    HINTON                    IA   3.50 INCH HAIL
06/19/96   PLYMOUTH                       SOME 3.00 INCH HAIL

0950 PM    7 NW KINGSLEY             IA   1.75 INCH HAIL
06/19/96   PLYMOUTH

1001 PM    5 SW CHEROKEE             IA   0.88 INCH HAIL
06/19/96   CHEROKEE

1011 PM    3.5 N REMSEN              IA   WIND DAMAGE
06/19/96   PLYMOUTH                       POWER LINES DOWN AND TREE
                                          DAMAGE
1013 PM    CORRECTIONVILLE           IA   1.75 INCH HAIL
06/19/96   WOODBURY

1014 PM    2 SW CORRECTIONVILLE      IA   2.50 INCH HAIL
06/19/96   WOODBURY

900 PM     2 N HINTON                IA   2.75 INCH HAIL
06/19/96   PLYMOUTH                       DAMAGED CAR ON HIGHWAY 75

0838 PM    SIOUX CENTER              IA   1.00 INCH HAIL
06/19/96   SIOUX

1005 PM    6 W CHEROKEE              IA   1.75 INCH HAIL
06/19/96   CHEROKEE                       COVERING GROUND

1115 PM    WASHTA                    IA   1.75 INCH HAIL
06/19/96   CHEROKEE                       MOSTLY 0.50 INCH HAIL

1142 PM    10 W LEMARS               IA   0.75 INCH HAIL
06/19/96   PLYMOUTH

1208 AM    1 N MOVILLE               IA   1.75 INCH HAIL
06/20/96   WOODBURY

1222 AM    PIERSON                   IA   0.75 INCH HAIL
06/20/96   WOODBURY

1229 AM    3 NW ANTHON               IA   1.75 INCH HAIL
06/20/96   WOODBURY                       MOSTLY 0.50 INCH

1235 AM    5 S ANTHON                IA   1.75 INCH HAIL
06/20/96   WOODBURY                       COVERING GROUND AND 50
                                          MPH WINDS

1202 AM    HOLSTEIN                  IA   1.50 INCH HAIL
06/20/96   IDA

1205 AM    KINGSLEY                  IA   1.75 INCH HAIL
06/20/96   PLYMOUTH                       58 MPH WINDS

1212 AM    KINGSLEY                  IA   1.75 INCH HAIL
06/20/96   PLYMOUTH                       15 MINUTE DURATION

1220 AM    CLIMBING HILL             IA   61 MPH WIND GUST
06/20/96   WOODBURY    (                   SPOTTER REPORT
END

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 7:05 PM CDT	Severe Thunderstorm Warning	FSD	Osceola	45 min
Jun 19, 7:44 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	31 min
Jun 19, 8:16 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	44 min
Jun 19, 9:00 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien, Sioux	35 min
Jun 19, 9:18 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	32 min
Jun 19, 9:26 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	44 min
Jun 19, 9:49 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	31 min
Jun 19, 9:50 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	35 min
Jun 19, 10:09 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Ida	31 min
Jun 19, 10:22 PM CDT	Severe Thunderstorm Warning	FSD	Ida, Woodbury	33 min
Jun 19, 10:54 PM CDT	Severe Thunderstorm Warning	FSD	Ida	31 min
Jun 19, 11:19 PM CDT	Severe Thunderstorm Warning	FSD	Ida, Woodbury	31 min
Jun 19, 11:50 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	30 min
Jun 20, 12:04 AM CDT	Severe Thunderstorm Warning	FSD	Woodbury	46 min
Jun 20, 12:20 AM CDT	Severe Thunderstorm Warning	FSD	Plymouth	15 min
Jun 20, 12:52 AM CDT	Severe Thunderstorm Warning	FSD	Woodbury	23 min
Jun 20, 1:26 AM CDT	Flash Flood Warning	FSD	Ida	3 hr
Jun 20, 8:32 AM CDT	Flash Flood Warning	FSD	Ida	5 hr
Jun 20, 2:13 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	32 min
Jun 20, 2:24 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	46 min
Jun 20, 2:45 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	30 min
Jun 20, 3:18 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	47 min
Jun 20, 3:51 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	34 min
Jun 20, 3:55 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	35 min
Jun 20, 4:37 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	33 min
Jun 20, 6:09 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Ida	31 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1996 Every 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.