Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 86, NWS Des Moines, IA

July 17, 1996Greene County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 17, 1996, 1:12 AM CDT for Greene County, Iowa. It was in force for 33 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 17, 1996, 1:12 AM CDT (06:12 UTC)
Expired
Jul 17, 1996, 1:45 AM CDT
In force
33 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Greene County, IA

What was reported inside it

TimeReportWhereRemark
Jul 17, 1:12 AM CDTHail 0.75Scranton, IA

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

Omaha, NE (KOAX), launched 00:00Z, 6.2 hours before the alert went out and 182 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 00:00Z on 1996-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1921 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 00:00Z on 1996-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 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
1921 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
979 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
214 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDSM 170611
SVRDSM
IAC073-170645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
112 AM CDT WED JUL 17 1996

* SEVERE THUNDERSTORM WARNING FOR
  WESTERN GREENE COUNTY - WEST CENTRAL IOWA

* UNTIL 145 AM CDT
 
* SOME LOCATIONS AFFECTED
    JEFFERSON
    SCRANTON

* AT 110 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES WEST
  OF JEFFERSON OR 60 MILES NORTHWEST OF DES MOINES MOVING EAST AT 30
  MPH.

* THE STORM WILL BE WILL BE IN JEFFERSON BY 125 AM CDT.

THIS IS A DANGEROUS STORM.  DO NOT GO OUTDOORS.




FAB

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 8:14 PM CDTSevere Thunderstorm WarningDMXCrawford31 min
Jul 16, 10:46 PM CDTSevere Thunderstorm WarningDMXCrawford34 min
Jul 17, 12:46 AM CDTFlash Flood WarningDMXCrawford6 hr
Jul 17, 2:36 AM CDTFlash Flood WarningDMXCarroll6 hr
Jul 17, 6:04 AM CDTFlash Flood WarningDMXCarroll, Crawford4 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 1996Every 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.