Alert archive / Iowa / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 140, NWS Sioux Falls, SD

July 28, 1986Monona County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 28, 1986, 9:02 PM CDT for Monona County, Iowa. It was in force for 58 min.

The area

The counties it named.

The facts

Issued: Jul 28, 1986, 9:02 PM CDT (02:02 UTC)
Expired: Jul 28, 1986, 10:00 PM CDT
In force: 58 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Monona County, IA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.0 hours before the alert went out and 88 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3613 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 119 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.

In the hours before

Special weather statement, Jul 28, 5:23 PM CDT, 3 hours 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
523 PM CDT MON JUL 28 1986

...SEVERE THUNDERSTORM WARNING LINCOLN COUNTY MINNESOTA AND EXTREME
NORTHEAST BROOKINGS COUNTY SOUTH DAKOTA TIL 545 PM CDT...

...SEVERE THUNDERSTORM WARNING BRULE AND AURORA COUNTIES SOUTH DAKOTA
TIL 545 PM CDT...

AT 458 PM CDT A POSSIBLE FUNNEL CLOUD WAS REPORTED NEAR KIMBALL SOUTH
DAKOTA WHICH DISSIPATED BY 505 PM CDT.

AT 501 PM CDT MARBALL SIZE HAIL WAS REPORTED NEAR IVANHOE MINNESOTA.

AT 511 PM CDT GOLF BALL SIZE HAIL AND 55 TO 60 MPH WINDS WERE REPORTED
AT KIMBALL SOUTH DAKOTA.

AT 517 PM RADAR SHOWED THE CENTERS OF THE SEVERE THUNDERSTORMS ABOUT
35 MILES WEST OF MITCHELL AND 25 MILES EAST OF BROOKINGS. THESE
THUNDERSTORMS WERE MOVING SOUTHEAST ABOUT 25 MPH.

SEVERE THUNDERSTORMS CAN PRODUCE LARGE HAIL...DAMAGING WINDS...
CONSIDERABLE CLOUD TO GROUND LIGHTNING AND VERY HEAVY RAIN. PERSONS
NEAR AND TO THE SOUTHEAST OF nTHESE THUNDERSTORMS SHOULD BE PREPARED
FOR THIS ADVERSE WEATHER AND MOVE TO A SAFE PLACE IF NECESSARY.
BLOOM

Special weather statement, Jul 28, 8:38 PM CDT, 24 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 7:25 PM CDT	Tornado Warning	FSD	Yankton	35 min
Jul 28, 7:45 PM CDT	Severe Thunderstorm Warning	FSD	Clay	60 min
Jul 29, 5:55 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Hutchinson, Yankton	65 min
Jul 29, 5:55 PM CDT	Severe Thunderstorm Warning	FSD	Douglas	65 min
Jul 29, 6:07 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, McCook	68 min
Jul 28, 7:03 PM CDT	Severe Thunderstorm Warning	FSD	Jackson	57 min
Jul 28, 7:03 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	57 min
Jul 28, 7:16 PM CDT	Tornado Warning	FSD	Sioux	29 min
Jul 28, 7:22 PM CDT	Tornado Warning	FSD	Woodbury	38 min
Jul 28, 7:29 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien	61 min
Jul 28, 7:43 PM CDT	Tornado Warning	FSD	O'Brien	62 min
Jul 28, 8:02 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	58 min
Jul 28, 8:03 PM CDT	Tornado Warning	FSD	Monona, Woodbury	27 min
Jul 28, 8:18 PM CDT	Tornado Warning	FSD	Cherokee	47 min
Jul 28, 8:34 PM CDT	Tornado Warning	FSD	Monona	26 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1986 Every severe thunderstorm warning in 1986

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.