Alert archive / Iowa / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 81, NWS Omaha, NE

May 15, 1998Mills County, Pottawattamie County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at May 15, 1998, 11:28 AM CDT for Mills County, Pottawattamie County, Iowa. It was in force for 62 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, 11:28 AM CDT (16:28 UTC)
Expired: May 15, 1998, 12:30 PM CDT
In force: 62 min
Issued by: NWS Omaha, NE
Area: Whole counties

Counties Mills County, IA, Pottawattamie 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, 7:45 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 4.5 hours before the alert went out and 68 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 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

Open this sounding in Storm Lab

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, May 15, 10:55 AM CDT, 33 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, 33 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

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 15, 7:37 AM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson, Pawnee	48 min
May 15, 8:24 AM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha	61 min
May 15, 8:24 AM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson	61 min
May 15, 8:28 AM CDT	Tornado Warning	OAX	Gage	47 min
May 15, 8:39 AM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Otoe	61 min
May 15, 8:50 AM CDT	Tornado Warning	OAX	Lancaster, Otoe	65 min
May 15, 8:58 AM CDT	Severe Thunderstorm Warning	OAX	Cass	62 min
May 15, 9:10 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy, Saunders	65 min
May 15, 9:34 AM CDT	Severe Thunderstorm Warning	OAX	Washington	61 min
May 15, 9:34 AM CDT	Severe Thunderstorm Warning	OAX	Dodge	61 min
May 15, 9:47 AM CDT	Severe Thunderstorm Warning	OAX	Burt	63 min
May 15, 9:47 AM CDT	Severe Thunderstorm Warning	OAX	Cuming	63 min
May 15, 10:13 AM CDT	Severe Thunderstorm Warning	OAX	Douglas	32 min
May 15, 10:17 AM CDT	Severe Thunderstorm Warning	OAX	Thurston	63 min
May 15, 12:55 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Platte	65 min
May 15, 1:22 PM CDT	Tornado Warning	OAX	Platte	48 min
May 15, 1:33 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Stanton	62 min
May 15, 1:49 PM CDT	Tornado Warning	OAX	Madison, Stanton	46 min
May 15, 8:58 AM CDT	Severe Thunderstorm Warning	OAX	Page	62 min
May 15, 9:16 AM CDT	Severe Thunderstorm Warning	OAX	Montgomery	64 min
May 15, 10:03 AM CDT	Tornado Warning	OAX	Shelby	47 min
May 15, 10:50 AM CDT	Severe Thunderstorm Warning	OAX	Monona	30 min
May 15, 12:27 PM CDT	Tornado Warning	OAX	Pottawattamie, Shelby	33 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

Severe Thunderstorm Warnings in Iowa, 1998 Every 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; the sounding from the Mesonet's radiosonde archive.