Alert archive / Iowa / Special Weather Statements in 2017
Special Weather Statement, NWS Des Moines, IA
NWS Des Moines, IA issued this special weather statement at Jul 20, 2017, 1:39 AM CDT for Winnebago County, Iowa. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2017, 1:39 AM CDT (06:39 UTC)
- Expired
- Jul 20, 2017, 2:45 AM CDT
- In force
- 66 min
- Issued by
- NWS Des Moines, IA
County Winnebago County, IA
The radar
The Minneapolis radar (KMPX), 160 km from the middle of the area, began a volume at 06:41 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
Minneapolis, MN (KMPX), launched 00:00Z, 6.7 hours before the alert went out and 160 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.
- Mixed-layer CAPE
- 14 J/kg
- Mixed-layer CIN
- -693 J/kg
- Mixed-layer LCL
- 1310 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 186 m²/s²
- 0-3 km storm-relative helicity
- 251 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Jul 19, 11:50 PM CDT, 1 hour 49 minutes earlier.
Area forecast discussion, Jul 19, 11:50 PM CDT, 1 hour 49 minutes before
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</html>Hazardous weather outlook, Jul 19, 7:45 PM CDT, 5 hours 54 minutes before
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</html>In the hours before
Local storm report, Jul 19, 10:12 PM CDT, 3 hours 27 minutes before
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</html>Local storm report, Jul 19, 10:14 PM CDT, 3 hours 25 minutes before
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</html>Local storm report, Jul 19, 10:17 PM CDT, 3 hours 22 minutes before
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</html>Local storm report, Jul 19, 10:20 PM CDT, 3 hours 19 minutes before
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</html>Local storm report, Jul 19, 10:24 PM CDT, 3 hours 15 minutes before
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</html>Special weather statement, Jul 20, 1:39 AM CDT, 0 minutes before
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</html>Nearby
Special Weather Statements in Iowa, 2017Every special weather statement in 2017
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.