Alert archive / Iowa / Tornado Warnings in 1998
Tornado Warning 15, NWS Omaha, NE
NWS Omaha, NE issued this tornado warning at May 15, 1998, 12:27 PM CDT for Pottawattamie County, Shelby County, Iowa. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 15, 1998, 12:27 PM CDT (17:27 UTC)
- Expired
- May 15, 1998, 1:00 PM CDT
- In force
- 33 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
Counties Pottawattamie County, IA, Shelby County, IA
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 15, 9:45 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 5.5 hours before the alert went out and 82 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
- 1194 J/kg
- Mixed-layer CIN
- -370 J/kg
- Mixed-layer LCL
- 1627 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- -76 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
423 WFUS1 KOMA 151729 RRA TOROMA IAC155-165-151800- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1227 PM CDT FRI MAY 15 1998 THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A * TORNADO WARNING FOR... SHELBY COUNTY IN SOUTHWESTERN IOWA EASTERN POTTAWATTAMIE COUNTY IN SOUTHWESTERN IOWA * UNTIL 100 PM CDT * AT 1225 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A POSSIBLE TORNADO 38 MILES EAST NORTHEAST OF DOWNTOWN OMAHA OR 6 MILES SOUTH OF WALNUT MOVING NORTH AT 45 MPH. * THE TORNADO IS EXPECTED TO BE NEAR... WALNUT AT 1225 PM CDT PRAIRIE ROSE STATE PARK AT 1235 PM CDT ELK HORN AT 1235 PM CDT JACKSONVILLE AT 1240 PM CDT KIRKMAN AT 1245 PM CDT PEOPLE IN THE WARNED AREA SHOULD MOVE TO A REINFORCED BUILDING ON THE LOWEST FLOOR TO BE PREPARED FOR THE DESTRUCTIVE WINDS THAT ACCOMPANY TORNADOES. IN ADDITION TO THE THREAT OF TORNADOES... LARGE HAIL...DANGEROUS LIGHTNING AND VERY HEAVY RAIN ARE LIKELY WITH THIS STORM. POLLACK
What forecasters said that day
The local office's own words before this tornado 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, May 15, 10:55 AM CDT, 1 hour 32 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-161200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1055 AM CDT FRI MAY 15 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTERS CONTINUE TO BE NEEDED FOR PARTS OF NEBRASKA AND SOUTHWEST IOWA THROUGH MID AFTERNOON. DISCUSSION... STRONG THUNDERSTORMS WILL CONTINUE TO LIFT OUT OF NORTHEAST NEBRASKA AND WESTERN IOWA THROUGH MID AFTERNOON...HOWEVER ISOLATED STORMS CONTINUE TO DEVELOP BEHIND THIS MAIN AREA. ZAPOTOCNY
Special weather statement, May 15, 10:55 AM CDT, 1 hour 32 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-161200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1055 AM CDT FRI MAY 15 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTERS CONTINUE TO BE NEEDED FOR PARTS OF NEBRASKA AND SOUTHWEST IOWA THROUGH MID AFTERNOON. DISCUSSION... STRONG THUNDERSTORMS WILL CONTINUE TO LIFT OUT OF NORTHEAST NEBRASKA AND WESTERN IOWA THROUGH MID AFTERNOON...HOWEVER ISOLATED STORMS CONTINUE TO DEVELOP BEHIND THIS MAIN AREA. ZAPOTOCNY
Special weather statement, May 15, 12:05 PM CDT, 22 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-161700- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1205 PM CDT FRI MAY 15 1998 SEVERE THUNDERSTORM WATCH NUMBER 352 HAS BEEN ALLOWED TO EXPIRE... HOWEVER A WATCH BOX MAY BE REISSUED FOR PARTS OF EASTERN NEBRASKA AND WESTERN IOWA AS THUNDERSTORMS REDEVELOP. A SEVERE THUNDERSTORM WATCH NUMBER 353 REMAINS IN EFFECT FOR PARTS OF NORTHEAST NEBRASKA AND NORTHWEST IOWA UNTIL 3PM. ZAPOTOCNY
Special weather statement, May 15, 12:05 PM CDT, 22 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-161700- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1205 PM CDT FRI MAY 15 1998 SEVERE THUNDERSTORM WATCH NUMBER 352 HAS BEEN ALLOWED TO EXPIRE... HOWEVER A WATCH BOX MAY BE REISSUED FOR PARTS OF EASTERN NEBRASKA AND WESTERN IOWA AS THUNDERSTORMS REDEVELOP. A SEVERE THUNDERSTORM WATCH NUMBER 353 REMAINS IN EFFECT FOR PARTS OF NORTHEAST NEBRASKA AND NORTHWEST IOWA UNTIL 3PM. ZAPOTOCNY
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 8:58 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 62 min |
| May 15, 8:58 AM CDT | Severe Thunderstorm Warning | OAX | Page | 62 min |
| May 15, 9:10 AM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 65 min |
| May 15, 9:16 AM CDT | Severe Thunderstorm Warning | OAX | Montgomery | 64 min |
| May 15, 9:34 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Shelby | 61 min |
| May 15, 9:47 AM CDT | Severe Thunderstorm Warning | OAX | Monona | 63 min |
| May 15, 10:03 AM CDT | Tornado Warning | OAX | Shelby | 47 min |
| May 15, 10:13 AM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 32 min |
| May 15, 10:50 AM CDT | Severe Thunderstorm Warning | OAX | Monona | 30 min |
| May 15, 11:28 AM CDT | Severe Thunderstorm Warning | OAX | Mills, Pottawattamie | 62 min |
| May 15, 2:58 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery, Pottawattamie | 62 min |
| May 15, 3:01 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 49 min |
| May 15, 3:10 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 50 min |
| May 15, 3:10 PM CDT | Severe Thunderstorm Warning | OAX | Shelby | 50 min |
Nearby
Tornado Warnings in Iowa, 1998Every tornado warning in 1998Tornadoes 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; the sounding from the Mesonet's radiosonde archive.