Alert archive / Iowa / Severe Thunderstorm Warnings in 1996
Severe Thunderstorm Warning 153, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 5, 1996, 12:19 AM CDT for Woodbury County, Iowa. It was in force for 31 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
- Aug 5, 1996, 12:19 AM CDT (05:19 UTC)
- Expired
- Aug 5, 1996, 12:50 AM CDT
- In force
- 31 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Woodbury County, IA
The radar
The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 05:19 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 |
|---|---|---|---|
| Aug 5, 12:25 AM CDT | Thunderstorm Wind 50 | Danbury, 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, 5.3 hours before the alert went out and 122 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.
- Mixed-layer CAPE
- 4142 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 823 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 3.8
- Supercell composite
- 16.8
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Aug 4, 10:02 PM CDT, 2 hours 17 minutes before
SDZ058-050335- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1001 PM CDT SUN AUG 4 1996 ...SMALL STREAM FLOOD ADVISORY FOR AROURA COUNTY EXPIRES... THE SMALL STREAM FLOOD ADVISORYx FOR AURORA COUNTY HAS EXPIRED. THE STORMS THAT CAUSED HEAVY RAIN OVER AURORA COUNTY HAD MOVED EAST AND WEAKENED. ADDITIONAL THUNDERSTORMS MAY MOVE INTO THE COUNTY BUT ARE NOT EXPECTED TO BE AS INTENSE. HOLMES
Special weather statement, Aug 4, 11:30 PM CDT, 49 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 8:21 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix | 34 min |
| Aug 4, 8:42 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 48 min |
| Aug 4, 9:33 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 32 min |
| Aug 4, 10:29 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Douglas | 46 min |
| Aug 4, 10:16 PM CDT | Flash Flood Warning | FSD | Ida | 119 min |
| Aug 4, 10:16 PM CDT | Flash Flood Warning | FSD | Ida | 104 min |
| Aug 4, 10:49 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 16 min |
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; radar from the NEXRAD Level II archive.