Alert archive / Iowa / Special Weather Statements in 2015

Special Weather Statement, NWS Des Moines, IA

April 18, 2015Hamilton County, Humboldt County, Wright County, Iowa

NWS Des Moines, IA issued this special weather statement at Apr 18, 2015, 3:49 PM CDT for Hamilton County, Humboldt County, Wright County, Iowa. It was in force for 41 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: Apr 18, 2015, 3:49 PM CDT (20:49 UTC)
Expired: Apr 18, 2015, 4:30 PM CDT
In force: 41 min
Issued by: NWS Des Moines, IA

Counties Hamilton County, IA, Humboldt County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 91 km from the middle of the area, began a volume at 20:52 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 12:00Z, 8.8 hours before the alert went out and 257 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: 70 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1002 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Apr 18, 3:23 PM CDT, 26 minutes earlier.

Area forecast discussion, Apr 18, 3:23 PM CDT, 26 minutes before

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Hazardous weather outlook, Apr 18, 5:40 AM CDT, 10 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
540 AM CDT SAT APR 18 2015

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-191045-
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-
540 AM CDT SAT APR 18 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED THROUGH TONIGHT.
THE MOST WIDESPREAD ACTIVITY WILL BE THIS AFTERNOON AND EVENING.
AN ISOLATED SEVERE STORM WITH QUARTER SIZED HAIL MAY OCCUR.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE SUNDAY. THE
THREAT OF SEVERE WEATHER IS LOW. WINDY CONDITIONS ARE EXPECTED BY
SUNDAY AFTERNOON WITH SUSTAINED 30 MPH WINDS OR GREATER POSSIBLE.

AREAS OF FROST OR AT LEAST FREEZING TEMPERATURES ARE POSSIBLE
ACROSS PORTIONS OF THE AREA ON TUESDAY...WEDNESDAY AND THURSDAY
MORNINGS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Special weather statement, Apr 18, 1:03 PM CDT, 2 hours 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
103 PM CDT SAT APR 18 2015

IAZ083-084-094-095-182015-
CLARKE-LUCAS-DECATUR-WAYNE-
INCLUDING THE CITIES OF...OSCEOLA...CHARITON...LAMONI...LEON...
CORYDON...SEYMOUR...ALLERTON...HUMESTON
103 PM CDT SAT APR 18 2015

...THUNDERSTORMS CAPABLE OF HAIL THIS AFTERNOON...

THUNDERSTORMS ARE MOVING INTO SOUTH CENTRAL IOWA EARLY THIS
AFTERNOON. THE STORMS MAY PRODUCE HAIL UP TO NICKEL TO PENNY SIZED
AS THEY MOVE TO THE NORTH NORTHWEST. BRIEF HEAVY RAINFALL AND
LIGHTNING WILL ALSO ACCOMPANY THESE STORMS THIS AFTERNOON.

REV

Special weather statement, Apr 18, 3:15 PM CDT, 34 minutes before

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Special weather statement, Apr 18, 3:44 PM CDT, 5 minutes before

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Special weather statement, Apr 18, 3:49 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
Apr 18, 1:29 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur	31 min
Apr 18, 3:15 PM CDT	Special Weather Statement	DMX	Story	30 min
Apr 18, 3:44 PM CDT	Special Weather Statement	DMX	Lucas	31 min
Apr 18, 5:24 PM CDT	Special Weather Statement	DMX	Grundy	36 min
Apr 18, 5:27 PM CDT	Special Weather Statement	DMX	Marion, Monroe	48 min
Apr 18, 6:04 PM CDT	Special Weather Statement	DMX	Butler, Cerro Gordo, Franklin	26 min
Apr 18, 6:15 PM CDT	Special Weather Statement	DMX	Jasper, Poweshiek	30 min
Apr 18, 6:34 PM CDT	Special Weather Statement	DMX	Cerro Gordo, Worth	41 min
Apr 18, 6:49 PM CDT	Special Weather Statement	DMX	Hardin, Marshall, Polk, Story, Tama	41 min

Nearby

Special Weather Statements in Iowa, 2015 Every special weather statement in 2015

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.