Alert archive / Iowa / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 120, NWS Des Moines, IA

June 27, 20197 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 27, 2019, 1:42 PM CDT for 7 counties in Iowa. It was in force for 18 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, 1:42 PM CDT (18:42 UTC)
Expired
Jun 27, 2019, 2:00 PM CDT
In force
18 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA, Winnebago County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 145 km from the middle of the area, began a volume at 18:42 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.

IssuedProductOfficeLasted
Jun 27, 12:23 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 6.7 hours before the alert went out and 210 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2019-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 352 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2019-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
352 J/kg
Mixed-layer CIN
-339 J/kg
Mixed-layer LCL
1615 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
118 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, 1:34 PM CDT, 8 minutes earlier.

Area forecast discussion, Jun 27, 1:34 PM CDT, 8 minutes before
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Hazardous weather outlook, Jun 27, 3:20 AM CDT, 10 hours 22 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, 10:57 AM CDT, 2 hours 45 minutes before
Special Weather Statement
National Weather Service Des Moines IA
1057 AM CDT Thu Jun 27 2019

IAZ005-006-271630-
Kossuth IA-Winnebago IA-
1057 AM CDT Thu Jun 27 2019

...GUSTY WINDS AND SMALl HAIL POSSIBLE...

At 1056 AM CDT, Doppler radar was tracking a strong thunderstorm 9
miles south of Elmore, or 22 miles west of Forest City, moving east
at 35 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Union Slogh, Buffalo Center, Thompson, Titonka, Lakota, Rake and
Ledyard.

LAT...LON 4350 9372 4326 9369 4326 9397 4324 9397
      4324 9412 4350 9419
TIME...MOT...LOC 1556Z 258DEG 33KT 4338 9405

Krull
Special weather statement, Jun 27, 11:00 AM CDT, 2 hours 42 minutes before
Special Weather Statement
National Weather Service Des Moines IA
1100 AM CDT Thu Jun 27 2019

IAZ005-015-023-024-271630-
Humboldt IA-Palo Alto IA-Kossuth IA-Pocahontas IA-
1100 AM CDT Thu Jun 27 2019

...GUSTY WINDS AND Small HAIL POSSIBLE...

At 1059 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 13 miles west of Union Slogh to 13 miles
southeast of Emmetsburg to 9 miles northeast of Pocahontas. Movement
was east at 35 mph.

Pea size hail and winds in excess of 30 mph will be possible with
these storms.

Locations impacted include...
Algona, West Bend, Bancroft, Rolfe, Burt, Whittemore, Bode, Fenton,
Lone Rock, Cylinder, Bradgate, St. Joseph, Ottosen, Rodman,
Irvington, Stinson Prairie State Park, Algona Municipal Airport and
Aa Call State Park.

LAT...LON 4336 9415 4278 9423 4276 9459 4295 9460
      4325 9449 4326 9444 4333 9444
TIME...MOT...LOC 1559Z 254DEG 29KT 4328 9439 4298 9450 4281 9450

Krull
Special weather statement, Jun 27, 11:44 AM CDT, 1 hour 58 minutes before
Special Weather Statement
National Weather Service Des Moines IA
1144 AM CDT Thu Jun 27 2019

IAZ005-016-017-024>026-035>037-271745-
Hamilton IA-Humboldt IA-Wright IA-Cerro Gordo IA-Kossuth IA-
Webster IA-Hardin IA-Hancock IA-Franklin IA-
1144 AM CDT Thu Jun 27 2019

...SMALL HAIL AND GUSTY WINDS LIKELY...

At 1143 AM CDT, Doppler radar was tracking a strong thunderstorm near
Belmond, or 11 miles north of Clarion, moving east at 50 mph.

Pea size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Iowa Falls, Hampton, Garner, Clarion, Eagle Grove, Belmond, Britt,
Sheffield, Rockwell, Big Wall Lake, Eagle Lake, Elm Lake, Alden,
Kanawha, Goldfield, Dows, Klemme, Latimer, Thornton and Corwith.

LAT...LON 4308 9302 4300 9302 4245 9323 4264 9423
      4314 9390
TIME...MOT...LOC 1643Z 279DEG 45KT 4289 9368

Krull
Special weather statement, Jun 27, 12:44 PM CDT, 58 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, 32 minutes before
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Local storm report, Jun 27, 1:11 PM CDT, 31 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 10:57 AM CDTSpecial Weather StatementDMXWinnebago33 min
Jun 27, 11:00 AM CDTSpecial Weather StatementDMXKossuth30 min
Jun 27, 11:23 AM CDTSevere Thunderstorm WarningDMXWinnebago, Worth37 min
Jun 27, 11:44 AM CDTSpecial Weather StatementDMXCerro Gordo, Franklin, Hancock, Wright61 min
Jun 27, 11:51 AM CDTSevere Thunderstorm WarningDMXWorth24 min
Jun 27, 12:04 PM CDTSevere Thunderstorm WarningDMXButler, Cerro Gordo, Franklin, Grundy, Hamilton, Hancock and 3 more41 min
Jun 27, 12:44 PM CDTSpecial Weather StatementDMXButler, Franklin, Hardin61 min
Jun 27, 12:56 PM CDTSevere Thunderstorm WarningDMXEmmet, Humboldt, Kossuth, Palo Alto, Pocahontas49 min
Jun 27, 1:45 PM CDTSpecial Weather StatementDMXBremer30 min
Jun 27, 3:09 PM CDTSpecial Weather StatementDMXCerro Gordo, Worth36 min
Jun 27, 3:50 PM CDTSpecial Weather StatementDMXButler40 min
Jun 27, 3:56 PM CDTSevere Thunderstorm WarningDMXButler32 min
Jun 27, 4:21 PM CDTSevere Thunderstorm WarningDMXButler7 min
Jun 27, 4:27 PM CDTSpecial Weather StatementDMXBremer63 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2019Every 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.