Alert archive / Iowa / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 121, NWS Des Moines, IA

June 27, 2019Butler County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 27, 2019, 3:56 PM CDT for Butler County, Iowa. It was in force for 32 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 27, 2019, 3:56 PM CDT (20:56 UTC)
Expired: Jun 27, 2019, 4:28 PM CDT
In force: 32 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Butler County, IA

The radar

The Des Moines radar (KDMX), 135 km from the middle of the area, began a volume at 21:00 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 27, 12:23 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.9 hours before the alert went out and 226 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: 1660 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 1139 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 27, 3:45 PM CDT, 11 minutes earlier.

Area forecast discussion, Jun 27, 3:45 PM CDT, 11 minutes before

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Hazardous weather outlook, Jun 27, 3:20 AM CDT, 12 hours 36 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
320 AM CDT Thu Jun 27 2019

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-280830-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-
Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-
Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-
Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-
Appanoose-Davis-
320 AM CDT Thu Jun 27 2019

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Thunderstorms may pass over northern Iowa later this morning into
this afternoon with the main threats being strong wind gusts and
isolated locally heavy rainfall. Additional storms may develop
tonight with strong wind gusts and heavy rainfall the primary
threats.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Hot and humid conditions are expected Friday through Monday. Heat
index values will be well into the 90s through this time period
with heat index values nearing 105 degrees at times in some areas
on Saturday and perhaps on Sunday.

Thunderstorms will return to parts of Iowa early next week. Any
severe risk will be better assessed in the coming days.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible over northern Iowa at times through
Thursday night.

Ansorge

In the hours before

Special weather statement, Jun 27, 12:44 PM CDT, 3 hours 12 minutes before

Special Weather Statement
National Weather Service Des Moines IA
1244 PM CDT Thu Jun 27 2019

IAZ017-025>027-036>038-271845-
Hamilton IA-Wright IA-Cerro Gordo IA-Grundy IA-Hardin IA-Franklin IA-
Butler IA-
1244 PM CDT Thu Jun 27 2019

...STRONG THUNDERSTORMS WITH GUSTY WINDS AND SMALL HAIL...

At 1243 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Greene to 7 miles southwest of Hampton to
7 miles west of Iowa Falls. Movement was southeast at 20 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Iowa Falls, Hampton, Eldora, Allison, Parkersburg, Ackley,
Clarksville, Shell Rock, Sheffield, Greene, Aplington, Rockwell, Big
Wall Lake, Hubbard, Alden, Dumont, Radcliffe, Dows, Latimer and
Williams.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
central, north central and northeastern Iowa.

LAT...LON 4221 9331 4257 9371 4307 9305 4305 9302
      4291 9302 4291 9278 4278 9255 4272 9255
TIME...MOT...LOC 1743Z 316DEG 18KT 4294 9282 4267 9330 4252 9342

Krull

Local storm report, Jun 27, 1:10 PM CDT, 2 hours 46 minutes before

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Local storm report, Jun 27, 1:11 PM CDT, 2 hours 45 minutes before

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Special weather statement, Jun 27, 1:45 PM CDT, 2 hours 11 minutes before

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Special weather statement, Jun 27, 3:09 PM CDT, 47 minutes before

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Special weather statement, Jun 27, 3:50 PM CDT, 6 minutes before

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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 27, 10:57 AM CDT	Special Weather Statement	DMX	Winnebago	33 min
Jun 27, 11:00 AM CDT	Special Weather Statement	DMX	Kossuth	30 min
Jun 27, 11:23 AM CDT	Severe Thunderstorm Warning	DMX	Winnebago, Worth	37 min
Jun 27, 11:44 AM CDT	Special Weather Statement	DMX	Cerro Gordo, Franklin, Hancock, Wright	61 min
Jun 27, 11:51 AM CDT	Severe Thunderstorm Warning	DMX	Worth	24 min
Jun 27, 12:04 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Cerro Gordo, Franklin, Grundy, Hamilton, Hancock and 3 more	41 min
Jun 27, 12:44 PM CDT	Special Weather Statement	DMX	Butler, Franklin, Hardin	61 min
Jun 27, 12:56 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Humboldt, Kossuth, Palo Alto, Pocahontas	49 min
Jun 27, 1:42 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas, Winnebago and 1 more	18 min
Jun 27, 1:45 PM CDT	Special Weather Statement	DMX	Bremer	30 min
Jun 27, 3:09 PM CDT	Special Weather Statement	DMX	Cerro Gordo, Worth	36 min
Jun 27, 3:50 PM CDT	Special Weather Statement	DMX	Butler	40 min
Jun 27, 4:21 PM CDT	Severe Thunderstorm Warning	DMX	Butler	7 min
Jun 27, 4:27 PM CDT	Special Weather Statement	DMX	Bremer	63 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2019 Every severe thunderstorm warning in 2019

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.