Alert archive / Iowa / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 101, NWS Des Moines, IA

August 4, 1995Sac County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 4, 1995, 3:27 PM CDT for Sac County, Iowa. It was in force for 18 min.

The area

The counties it named.

The facts

Issued
Aug 4, 1995, 3:27 PM CDT (20:27 UTC)
Expired
Aug 4, 1995, 3:45 PM CDT
In force
18 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Sac County, IA

The radar

The Des Moines radar (KDMX), 135 km from the middle of the area, began a volume at 20:28 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, 8.5 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 1995-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1425 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, Omaha, NE at 12:00Z on 1995-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
1425 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
765 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
-25 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDSM 042025 RRA
SVRDSM
IAC161-042045-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
327 PM CDT FRI AUG 4 1995

* SEVERE THUNDERSTORM WARNING FOR
  NORTHEASTERN SAC COUNTY - WEST CENTRAL IOWA

* UNTIL 345 PM CDT
 
* SOME TOWNS AFFECTED
    SAC CITY
    OPEN FARMLAND

* AT 322 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 45 MILES WEST OF
  FORT DODGE MOVING SOUTHEAST AT 15 MPH.

* THE STORM WILL BE NEARJ LYTTON BY 340 PM.

THIS IS A DANGEROUS STORM.  DO NOT GO OUTDOORS.

BSS/MS

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 4, 3:20 PM CDTSevere Thunderstorm WarningDMXPocahontas15 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1995Every severe thunderstorm warning in 1995

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.