Alert archive / Mississippi / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 170, NWS Jackson, MS

June 30, 1989Humphreys County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Jun 30, 1989, 5:54 PM CDT for Humphreys County, Mississippi. It was in force for 36 min.

The area

The counties it named.

The facts

Issued
Jun 30, 1989, 5:54 PM CDT (22:54 UTC)
Expired
Jun 30, 1989, 6:30 PM CDT
In force
36 min
Issued by
NWS Jackson, MS
Area
Whole counties

County Humphreys County, MS

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

Jackson, MS (KJAN), launched 12:00Z, 10.9 hours before the alert went out and 99 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, Jackson, MS at 12:00Z on 1989-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 686 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, Jackson, MS at 12:00Z on 1989-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.1939Sfc1 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
686 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
715 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
37 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.

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 30, 1:45 PM CDTSevere Thunderstorm WarningJANJones45 min
Jun 30, 5:01 PM CDTSevere Thunderstorm WarningJANRankin29 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 1989Every severe thunderstorm warning in 1989

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.