Alert archive / Iowa / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 178, NWS Omaha, NE

June 25, 2018Montgomery County, Page County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jun 25, 2018, 8:35 PM CDT for Montgomery County, Page County, Iowa. It was in force for 25 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: Jun 25, 2018, 8:35 PM CDT (01:35 UTC)
Expired: Jun 25, 2018, 9:00 PM CDT
In force: 25 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Montgomery County, IA, Page County, IA

The radar

The Omaha radar (KOAX), 113 km from the middle of the area, began a volume at 01:38 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.6 hours before the alert went out and 113 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: 376 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1065 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

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.

NWS Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 25, 6:42 PM CDT, 1 hour 53 minutes earlier.

Area forecast discussion, Jun 25, 6:42 PM CDT, 1 hour 53 minutes before

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Hazardous weather outlook, Jun 25, 4:20 PM CDT, 4 hours 15 minutes before

Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
420 PM CDT Mon Jun 25 2018

IAZ043-NEZ011-012-015>018-030>034-042>044-050-261130-
Monona-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Burt-Platte-Colfax-Dodge-Butler-
420 PM CDT Mon Jun 25 2018

This Hazardous Weather Outlook is for portions of west central
Iowa...east central Nebraska and northeast Nebraska.

.DAY ONE...Tonight and Tuesday

Widespread showers and a few thunderstorms will push across the
area through this evening. Due to the excessive rainfall as of
late and addition rounds of heavy rainfall, a Flash Flood Watch
remains in effect until late this evening.

.DAYS TWO THROUGH SEVEN...Tuesday night through Monday

A few storms may develop Wednesday night.

Additional thunderstorms are possible by Friday night and into the
weekend.

.SPOTTER INFORMATION STATEMENT...

Storm spotter activation is not anticipated through Tuesday.
However, any reports of flash flooding or heavy rain amounts to
the National Weather Service will be appreciated.

IAZ055-056-069-079-080-090-091-NEZ045-051>053-065>068-078-088>093-
261130-
Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-Page-
Washington-Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Otoe-
Saline-Jefferson-Gage-Johnson-Nemaha-Pawnee-Richardson-
420 PM CDT Mon Jun 25 2018

This Hazardous Weather Outlook is for portions of southwest
Iowa...east central Nebraska and southeast Nebraska.

.DAY ONE...Tonight and Tuesday

An unstable environment coupled with adequate shear will be on tap
for strong to severe storms through this evening along and south
of the I-80 corridor. Large hail and damaging winds are the
primary hazards. In addition to this, isolated tornadoes are
possible especially over southwest Iowa.

River flooding will continue along the Missouri River from
Brownville downstream to Rulo. Small stream and creek flooding is
also possible in parts of the area.

.DAYS TWO THROUGH SEVEN...Tuesday night through Monday

A few storms may develop Wednesday night.

Additional thunderstorms are possible by Friday night and into the
weekend.

Minor river flooding is forecast to continue along the Missouri
River from near Nebraska City to Brownville and Rulo much of the
week. Flooding may develop farther north along the Missouri River,
especially around Plattsmouth to Nebraska City.

.SPOTTER INFORMATION STATEMENT...

Storm spotter activation may be needed this afternoon and this
evening.

In the hours before

Local storm report, Jun 25, 6:42 PM CDT, 1 hour 53 minutes before

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Local storm report, Jun 25, 6:53 PM CDT, 1 hour 42 minutes before

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Local storm report, Jun 25, 7:37 PM CDT, 58 minutes before

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Special weather statement, Jun 25, 8:07 PM CDT, 28 minutes before

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Local storm report, Jun 25, 8:26 PM CDT, 9 minutes before

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Special weather statement, Jun 25, 8:29 PM CDT, 6 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 7:19 PM CDT	Areal Flood Advisory	OAX	Dodge	3 hr
Jun 25, 7:22 PM CDT	Areal Flood Warning	OAX	Dodge	3 hr
Jun 25, 8:01 PM CDT	Areal Flood Warning	OAX	Burt, Cuming, Thurston, Wayne	3 hr
Jun 25, 8:24 PM CDT	Areal Flood Warning	OAX	Wayne	6 hr
Jun 25, 9:31 PM CDT	River Flood Warning	OAX	Dodge	56 hr
Jun 25, 9:52 PM CDT	Areal Flood Warning	OAX	Platte	12 hr
Jun 25, 9:58 PM CDT	River Flood Warning	OAX	Thurston	24 hr
Jun 25, 11:11 PM CDT	River Flood Warning	OAX	Butler, Polk, Seward	16 hr
Jun 26, 1:54 AM CDT	Areal Flood Advisory	OAX	Cuming, Wayne	8 hr
Jun 26, 6:10 AM CDT	River Flood Warning	OAX	Saunders	4 hr
Jun 26, 10:19 AM CDT	Areal Flood Warning	OAX	Burt, Butler, Colfax, Cuming, Dodge, Madison and 6 more	9 hr
Jun 26, 10:29 AM CDT	River Flood Warning	OAX	Washington	3 days
Jun 26, 10:29 AM CDT	River Flood Warning	OAX	Douglas, Sarpy	3 days
Jun 26, 10:32 AM CDT	River Flood Warning	OAX	Cuming	33 hr
Jun 26, 3:30 PM CDT	Heat Advisory	OAX	Antelope, Boone, Butler, Cass, Colfax, Dodge and 17 more	3 days
Jun 26, 4:45 PM CDT	Flash Flood Warning	OAX	Colfax	12 hr
Jun 26, 6:42 PM CDT	Areal Flood Warning	OAX	Burt, Colfax, Cuming, Dodge, Madison, Platte and 5 more	12 hr
Jun 25, 8:07 PM CDT	Special Weather Statement	OAX	Shelby	38 min
Jun 25, 8:29 PM CDT	Special Weather Statement	OAX	Montgomery, Page	31 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2018 Every severe thunderstorm warning in 2018

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; radar from the NEXRAD Level II archive.