Alert archive / Iowa / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 228, NWS Des Moines, IA

June 26, 2010Dallas County, Polk County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 26, 2010, 5:29 AM CDT for Dallas County, Polk County, Iowa. It was in force for 23 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, 2010, 5:29 AM CDT (10:29 UTC)
Expired: Jun 26, 2010, 5:52 AM CDT
In force: 23 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Dallas County, IA, Polk County, IA

The radar

The Des Moines radar (KDMX), 9 km from the middle of the area, began a volume at 10:30 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, 10.5 hours before the alert went out and 217 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: 4115 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1377 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 274 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 25.0

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, 4:23 AM CDT, 1 hour 6 minutes earlier.

Area forecast discussion, Jun 26, 4:23 AM CDT, 1 hour 6 minutes before

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Hazardous weather outlook, Jun 26, 4:53 AM CDT, 36 minutes before

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In the hours before

Special weather statement, Jun 26, 2:25 AM CDT, 3 hours 4 minutes before

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Local storm report, Jun 26, 2:31 AM CDT, 2 hours 58 minutes before

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Special weather statement, Jun 26, 2:53 AM CDT, 2 hours 36 minutes before

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Local storm report, Jun 26, 3:50 AM CDT, 1 hour 39 minutes before

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Local storm report, Jun 26, 4:36 AM CDT, 53 minutes before

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Special weather statement, Jun 26, 4:52 AM CDT, 37 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, 8:24 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Kossuth, Winnebago, Worth	66 min
Jun 25, 8:39 PM CDT	Tornado Warning	DMX	Cerro Gordo, Worth	39 min
Jun 25, 9:11 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Cerro Gordo, Franklin	49 min
Jun 25, 9:26 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Hancock, Humboldt, Kossuth, Palo Alto, Winnebago and 1 more	49 min
Jun 25, 9:38 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto	67 min
Jun 25, 9:58 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler	47 min
Jun 25, 10:02 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin, Grundy, Hamilton, Hardin, Humboldt and 2 more	43 min
Jun 25, 10:06 PM CDT	Tornado Warning	DMX	Wright	24 min
Jun 25, 10:09 PM CDT	Tornado Warning	DMX	Humboldt, Wright	12 min
Jun 25, 10:17 PM CDT	Flash Flood Warning	DMX	Butler, Franklin, Wright	6 hr
Jun 25, 10:35 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler, Grundy	40 min
Jun 25, 10:37 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Emmet, Humboldt, Kossuth, Palo Alto, Pocahontas and 2 more	53 min
Jun 25, 10:40 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Grundy, Hamilton, Hardin, Marshall, Story and 2 more	50 min
Jun 25, 11:23 PM CDT	River Flood Warning	DMX	Emmet	13 days
Jun 25, 11:31 PM CDT	Flash Flood Warning	DMX	Emmet, Palo Alto	6 hr
Jun 25, 11:33 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Jasper, Polk, Story	57 min
Jun 25, 11:35 PM CDT	Areal Flood Advisory	DMX	Emmet, Kossuth, Palo Alto	3 hr
Jun 25, 11:45 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Palo Alto, Pocahontas, Sac	60 min
Jun 26, 12:13 AM CDT	Flash Flood Warning	DMX	Humboldt, Pocahontas, Webster	6 hr
Jun 26, 12:20 AM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Humboldt, Pocahontas, Webster, Wright	40 min
Jun 26, 12:45 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas	60 min
Jun 26, 1:38 AM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Monroe, Wapello	37 min
Jun 26, 3:52 AM CDT	Severe Thunderstorm Warning	DMX	Palo Alto	38 min
Jun 26, 3:55 AM CDT	Flash Flood Watch	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more	28 hr
Jun 26, 4:30 AM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Kossuth, Palo Alto, Pocahontas	60 min
Jun 26, 5:06 AM CDT	River Flood Warning	DMX	Webster	7 days
Jun 26, 5:09 AM CDT	River Flood Warning	DMX	Palo Alto	4 days
Jun 26, 6:05 AM CDT	Areal Flood Warning	DMX	Humboldt	12 hr
Jun 26, 6:34 AM CDT	River Flood Warning	DMX	Mahaska	6 days
Jun 26, 7:00 AM CDT	Areal Flood Warning	DMX	Palo Alto	12 hr
Jun 26, 9:54 AM CDT	River Flood Warning	DMX	Madison, Warren	5 hr
Jun 26, 4:22 PM CDT	River Flood Warning	DMX	Jasper, Marion, Polk	4 hr
Jun 26, 4:34 PM CDT	River Flood Warning	DMX	Marshall	5 days

Nearby

Severe Thunderstorm Warnings in Iowa, 2010 Every severe thunderstorm warning in 2010

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.