Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Des Moines, IA

September 25, 2017Boone County, Iowa

NWS Des Moines, IA issued this special weather statement at Sep 25, 2017, 3:16 PM CDT for Boone County, Iowa. It was in force for 44 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: Sep 25, 2017, 3:16 PM CDT (20:16 UTC)
Expired: Sep 25, 2017, 4:00 PM CDT
In force: 44 min
Issued by: NWS Des Moines, IA

County Boone County, IA

The radar

The Des Moines radar (KDMX), 38 km from the middle of the area, began a volume at 20:20 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 12:00Z, 8.3 hours before the alert went out and 313 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Sep 25, 3:12 PM CDT, 4 minutes earlier.

Area forecast discussion, Sep 25, 3:12 PM CDT, 4 minutes before

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Hazardous weather outlook, Sep 25, 4:06 AM CDT, 11 hours 10 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
406 AM CDT Mon Sep 25 2017

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-260915-
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-
406 AM CDT Mon Sep 25 2017

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Widespread showers and non-severe thunderstorms are forecast
today through tonight. There may be a few brief periods of
moderate rainfall mainly across western Iowa as well.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

FAB

In the hours before

Special weather statement, Sep 25, 2:01 PM CDT, 1 hour 15 minutes before

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Special weather statement, Sep 25, 2:12 PM CDT, 1 hour 4 minutes before

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Special weather statement, Sep 25, 2:45 PM CDT, 31 minutes before

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Special weather statement, Sep 25, 3:16 PM CDT, 0 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
Sep 25, 2:01 PM CDT	Special Weather Statement	DMX	Dallas	44 min
Sep 25, 2:12 PM CDT	Special Weather Statement	DMX	Guthrie	48 min
Sep 25, 2:45 PM CDT	Special Weather Statement	DMX	Greene, Guthrie	30 min
Sep 25, 4:53 PM CDT	Special Weather Statement	DMX	Cerro Gordo, Franklin	67 min
Sep 25, 5:14 PM CDT	Special Weather Statement	DMX	Polk, Story	61 min
Sep 25, 6:20 PM CDT	Special Weather Statement	DMX	Polk, Story	85 min

Nearby

Special Weather Statements in Iowa, 2017 Every 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.