Alert archive / Iowa / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 171, NWS Des Moines, IA

June 26, 2013Butler County, Franklin County, Grundy County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 26, 2013, 1:58 PM CDT for Butler County, Franklin County, Grundy County, Iowa. It was in force for 47 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 26, 2013, 1:58 PM CDT (18:58 UTC)
Expired: Jun 26, 2013, 2:45 PM CDT
In force: 47 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Butler County, IA, Franklin County, IA, Grundy County, IA

The radar

The Des Moines radar (KDMX), 118 km from the middle of the area, began a volume at 18:59 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

Davenport, (KDVN), launched 12:00Z, 7.0 hours before the alert went out and 231 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: 12 J/kg
Mixed-layer CIN: -261 J/kg
Mixed-layer LCL: 1376 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 106 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 26, 12:39 PM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, Jun 26, 12:39 PM CDT, 1 hour 19 minutes before

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Hazardous weather outlook, Jun 26, 6:15 AM CDT, 7 hours 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
615 AM CDT WED JUN 26 2013

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-271115-
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-
615 AM CDT WED JUN 26 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

THERE MAY BE A FEW BRIEF THUNDERSTORMS EARLY THIS MORNING. SEVERE
WEATHER IS NOT ANTICIPATED.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

CHANCES FOR THUNDERSTORMS RETURN TO SOUTHWEST IOWA THURSDAY. A
FEW STORMS MAY BE STRONG WITH SMALL HAIL.

OTHER LOW CHANCES FOR THUNDERSTORMS ARE IN THE FORECAST AROUND
SATURDAY AND AGAIN TUESDAY. SEVERE WEATHER IS NOT ANTICIPATED AT
THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED.

FAB

In the hours before

Local storm report, Jun 26, 12:03 PM CDT, 1 hour 55 minutes before

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Local storm report, Jun 26, 12:50 PM CDT, 1 hour 8 minutes before

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Special weather statement, Jun 26, 12:54 PM CDT, 1 hour 4 minutes before

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Special weather statement, Jun 26, 1:24 PM CDT, 34 minutes before

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Special weather statement, Jun 26, 1:47 PM CDT, 11 minutes before

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Local storm report, Jun 26, 1:53 PM CDT, 5 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 25, 11:37 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	23 min
Jun 26, 12:32 AM CDT	Flash Flood Warning	DMX	Bremer, Butler	6 hr
Jun 26, 2:02 AM CDT	Flash Flood Warning	DMX	Black Hawk	6 hr
Jun 26, 8:33 AM CDT	Severe Thunderstorm Warning	DMX	Kossuth, Winnebago	42 min
Jun 26, 9:17 AM CDT	Severe Thunderstorm Warning	DMX	Hancock, Winnebago	43 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2013 Every severe thunderstorm warning in 2013

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.