Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 28, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Apr 12, 1998, 7:37 PM CDT for Harrison County, Shelby County, Iowa. It was in force for 48 min. 2 reports 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
- Apr 12, 1998, 7:37 PM CDT (00:37 UTC)
- Expired
- Apr 12, 1998, 8:25 PM CDT
- In force
- 48 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
Counties Harrison County, IA, Shelby County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 12, 7:37 PM CDT | Hail 1.75 | Woodbine, IA | |
| Apr 12, 8:03 PM CDT | Hail 0.75 | Earling, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 12, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.6 hours before the alert went out and 78 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
- 390 J/kg
- Mixed-layer CIN
- -83 J/kg
- Mixed-layer LCL
- 1826 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 324 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.3
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, Apr 12, 5:35 PM CDT, 2 hours 2 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-131200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 535 PM CDT SUN APR 12 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTERS MAY CONTINUE TO BE REQUIRED ACROSS EAST CENTRAL AND SOUTHEAST NEBRASKA AND SOUTHWEST IOWA THIS EVENING. A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM CDT FOR A LARGE PART OF THIS AREA. DISCUSSION... SEVERE THUNDERSTORMS REMAIN A POSSIBILITY ACROSS EAST CENTRAL AND SOUTHEAST NEBRASKA INTO SOUTHWEST IOWA THIS EVENING. THUNDERSTORMS MAY PRODUCE LARGE HAIL AND COULD PRODUCE DAMAGING WINDS. DRIER AIR HAS MOVED INTO MUCH OF NORTHEAST NEBRASKA AND FURTHER SEVERE WEATHER IS UNLIKELY THERE. POWERS
Special weather statement, Apr 12, 5:35 PM CDT, 2 hours 2 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-131200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 535 PM CDT SUN APR 12 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTERS MAY CONTINUE TO BE REQUIRED ACROSS EAST CENTRAL AND SOUTHEAST NEBRASKA AND SOUTHWEST IOWA THIS EVENING. A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM CDT FOR A LARGE PART OF THIS AREA. DISCUSSION... SEVERE THUNDERSTORMS REMAIN A POSSIBILITY ACROSS EAST CENTRAL AND SOUTHEAST NEBRASKA INTO SOUTHWEST IOWA THIS EVENING. THUNDERSTORMS MAY PRODUCE LARGE HAIL AND COULD PRODUCE DAMAGING WINDS. DRIER AIR HAS MOVED INTO MUCH OF NORTHEAST NEBRASKA AND FURTHER SEVERE WEATHER IS UNLIKELY THERE. POWERS
Special weather statement, Apr 12, 5:54 PM CDT, 1 hour 43 minutes before
IAZ043-055-056-069-079-090-NEZ011-012-015>018-030>034-042>045- 050>053-065>068-078-088>093-130200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 554 PM CDT SUN APR 12 1998 ...SEVERE THUNDERSTORM WATCH CANCELLED IN PARTS OF NORTHEAST NEBRASKA... SEVERE THUNDERSTORM WATCH 201...ISSUED AROUND 3 PM CDT THIS SUNDAY EVENING IS NO LONGER IN EFFECT IN THE FOLLOWING COUNTIES OF NORTHEAST NEBRASKA... KNOX...CEDAR...ANTELOPE...PIERCE...WAYNE...BOONE...MADISON AND STANTON. THIS IS ROUGHLY THE AREA NORTHWEST OF A SIOUX CITY TO NORFOLK TO ALBION LINE. THUNDERSTORMS HAVE MOVED EAST OF THIS AREA AND SEVERE WEATHER IS NOW UNLIKELY. SEVERE THUNDERSTORM WATCH 201 REMAINS IN EFFECT UNTIL 9 PM CDT FOR PLATTE...COLFAX...CUMING...BURT...DODGE...WASHINGTON...BURT... SAUNDERS...DOUGLAS...SARPY...SEWARD...LANCASTER...CASS...OTOE... SALINE...JEFFERSON...GAGE...JOHNSON...NEMAHA...PAWNEE AND RICHARDSON COUNTIES OF EASTERN NEBRASKA...AS WELL AS MONONA...HARRISON... SHELBY...POTTAWATTAMIE...MILLS AND FREMONT COUNTIES OF SOUTHWEST IOWA. THUNDERSTORMS PRODUCING LARGE HAIL AND DAMAGING WINDS ARE STILL POSSIBLE IN THESE AREAS. POWERS
Special weather statement, Apr 12, 7:25 PM CDT, 12 minutes before
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</html>Special weather statement, Apr 12, 7:25 PM CDT, 12 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.
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</html>The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 11:47 PM CDT | Severe Thunderstorm Warning | OAX | Colfax, Platte | 48 min |
| Apr 13, 4:11 AM CDT | Severe Thunderstorm Warning | OAX | Montgomery | 34 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1998Every severe thunderstorm warning in 1998
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.