Alert archive / South Dakota / Tornado Warnings in 1986

Tornado Warning 12, NWS Aberdeen, SD

July 18, 1986Dewey County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Jul 18, 1986, 4:40 PM MDT for Dewey County, South Dakota. It was in force for 35 min.

The area

The counties it named.

The facts

Issued
Jul 18, 1986, 4:40 PM MDT (22:40 UTC)
Expired
Jul 18, 1986, 5:15 PM MDT
In force
35 min
Issued by
NWS Aberdeen, SD
Area
Whole counties

County Dewey County, SD

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

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.7 hours before the alert went out and 180 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, Bismarck Municip, ND at 12:00Z on 1986-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Bismarck Municip, ND at 12:00Z on 1986-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2375 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
339 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 1:55 PM MDTSevere Thunderstorm WarningABRClark, Codington65 min
Jul 18, 2:24 PM MDTSevere Thunderstorm WarningABRClark, Hamlin, Kingsbury51 min
Jul 18, 3:13 PM MDTSevere Thunderstorm WarningABRCodington, Hamlin47 min
Jul 18, 3:27 PM MDTSevere Thunderstorm WarningABRCodington, Hamlin33 min
Jul 18, 3:35 PM MDTSevere Thunderstorm WarningABRDeuel55 min
Jul 18, 4:01 PM MDTTornado WarningABRDeuel29 min
Jul 18, 5:04 PM MDTSevere Thunderstorm WarningABRCorson56 min

Nearby

Tornado Warnings in South Dakota, 1986Every tornado warning in 1986Tornadoes 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.