Alert archive / South Dakota / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 113, NWS Aberdeen, SD

July 20, 1996Lyman County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 20, 1996, 8:06 PM CDT for Lyman County, South Dakota. It was in force for 59 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: Jul 20, 1996, 8:06 PM CDT (01:06 UTC)
Expired: Jul 20, 1996, 9:05 PM CDT
In force: 59 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Lyman County, SD

The radar

The Aberdeen radar (KABR), 207 km from the middle of the area, began a volume at 01:06 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
Jul 20, 8:18 PM CDT	Thunderstorm Wind 61	Oacoma, SD

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 nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.1 hours before the alert went out and 160 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: 1153 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: -16 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KABR 210107
SVRABR
SDC085-210205-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
806 PM CDT SAT JUL 20 1996

THE NATIONAL WEATHER SERVICE IN ABERDEEN SD HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 905 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN CENTRAL SOUTH DAKOTA

   ...EASTERN LYMAN COUNTY
 
THIS SEVERE THUNDERSTORM IS EXPECTED TO REACH...
OACOMA                              AROUND 842 PM CDT
CHAMBERLAIN                         AROUND 900 PM CDT

AT 802 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY ABERDEEN
DOPPLER RADAR AND SPOTTER REPORTS 14 MILES NORTHWEST OF CHAMBERLAIN
OR IN THE VICINITY OF RELIANCE MOVING SOUTHEAST AT 15 MPH.

AT 755 PM CDT...A SPOTTER REPORTED DIME SIZE HAIL AROUND THE IRON
NATION AREA.

A TORNADO WATCH IS ALSO IN EFFECT.  SEVERE THUNDERSTORMS CAN
PRODUCE TORNADOES.
 
A SEVERE THUNDERSTORM WARNING MEANS HAIL 3/4 INCH OR LARGER AND/OR
WINDS IN EXCESS OF 60 MPH HAVE BEEN INDICATED BY RADAR OR HAVE BEEN
REPORTED. SEEK SHELTER INDOORS WHEN STORMS APPROACH. IF A BUILDING
IS NOT AVAILABLE...A FULLY ENCLOSED AUTOMOBILE WILL PROVIDE
LIGHTNING PROTECTION.

RB/MM
&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 7:01 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Lyman	64 min
Jul 20, 7:06 PM CDT	Tornado Warning	ABR	Sully	49 min
Jul 21, 12:32 AM CDT	Severe Thunderstorm Warning	ABR	Sully	48 min
Jul 21, 1:00 AM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Lyman	30 min
Jul 21, 2:27 AM CDT	Severe Thunderstorm Warning	ABR	Hyde, Sully	43 min
Jul 21, 2:33 AM CDT	Severe Thunderstorm Warning	ABR	Hughes	32 min
Jul 21, 2:42 AM CDT	Severe Thunderstorm Warning	ABR	Lyman	48 min
Jul 21, 3:34 AM CDT	Severe Thunderstorm Warning	ABR	Potter	31 min
Jul 21, 4:30 AM CDT	Flash Flood Warning	ABR	Dewey, Stanley	30 min
Jul 21, 4:30 AM CDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley	30 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.