Alert archive / Iowa / Special Weather Statements in 2016

Special Weather Statement, NWS Des Moines, IA

July 12, 2016Black Hawk County, Bremer County, Iowa

NWS Des Moines, IA issued this special weather statement at Jul 12, 2016, 12:00 AM CDT for Black Hawk County, Bremer County, Iowa. It was in force for 30 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 12, 2016, 12:00 AM CDT (05:00 UTC)
Expired: Jul 12, 2016, 12:30 AM CDT
In force: 30 min
Issued by: NWS Des Moines, IA

Counties Black Hawk County, IA, Bremer County, IA

The radar

The Des Moines radar (KDMX), 142 km from the middle of the area, began a volume at 05:00 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 00:00Z, 5.0 hours before the alert went out and 180 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: 1884 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1228 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 179 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 Jul 11, 11:58 PM CDT, 2 minutes earlier.

Area forecast discussion, Jul 11, 11:58 PM CDT, 2 minutes before

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Hazardous weather outlook, Jul 11, 7:00 PM CDT, 5 hours before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
700 PM CDT MON JUL 11 2016

IAZ004>007-015>017-023>026-033>037-044>048-057>060-070>073-
081>083-092-093-121100-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-SAC-CALHOUN-WEBSTER-HAMILTON-
HARDIN-CRAWFORD-CARROLL-GREENE-BOONE-STORY-AUDUBON-GUTHRIE-DALLAS-
POLK-CASS-ADAIR-MADISON-WARREN-ADAMS-UNION-CLARKE-TAYLOR-RINGGOLD-
700 PM CDT MON JUL 11 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

THUNDERSTORMS ARE EXPECTED TO MOVE ACROSS THE AREA THIS EVENING
AND INTO THE OVERNIGHT. A FEW STORMS MAY BE SEVERE WITH DAMAGING
WIND GUSTS IN EXCESS OF 60 MPH AND HALF DOLLAR SIZED HAIL. THE
STRONGEST STORMS ARE EXPECTED THROUGH MIDNIGHT. LOCALLY HEAVY
RAINFALL MAY OCCUR.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ADDITIONAL THUNDERSTORMS ARE POSSIBLE TUESDAY AND WEDNESDAY WITH A
FEW SEVERE STORMS AND LOCALLY HEAVY RAINFALL POSSIBLE. ADDITIONAL
THUNDERSTORMS ARE FORECAST FOR NEXT WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED AT TIMES TONIGHT THROUGH
WEDNESDAY.

IAZ027-028-038-039-049-050-061-062-074-075-084>086-094>097-121100-
BUTLER-BREMER-GRUNDY-BLACK HAWK-MARSHALL-TAMA-JASPER-POWESHIEK-
MARION-MAHASKA-LUCAS-MONROE-WAPELLO-DECATUR-WAYNE-APPANOOSE-DAVIS-
700 PM CDT MON JUL 11 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

THUNDERSTORMS ARE EXPECTED TO MOVE ACROSS THE AREA
OVERNIGHT...GENERALLY AFTER MIDNIGHT. AN ISOLATED SEVERE STORM
WILL BE POSSIBLE WITH DAMAGING WINDS OF 60 MPH AND QUARTER HAIL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ADDITIONAL THUNDERSTORMS ARE POSSIBLE TUESDAY AND WEDNESDAY WITH A
FEW SEVERE STORMS AND LOCALLY HEAVY RAINFALL POSSIBLE. ADDITIONAL
THUNDERSTORMS ARE FORECAST FOR NEXT WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED AT TIMES TONIGHT THROUGH
WEDNESDAY.

In the hours before

Local storm report, Jul 11, 10:56 PM CDT, 1 hour 4 minutes before

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Special weather statement, Jul 11, 11:24 PM CDT, 36 minutes before

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Special weather statement, Jul 11, 11:26 PM CDT, 34 minutes before

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Special weather statement, Jul 11, 11:29 PM CDT, 31 minutes before

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Special weather statement, Jul 11, 11:51 PM CDT, 9 minutes before

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Special weather statement, Jul 12, 12:00 AM 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
Jul 11, 8:13 PM CDT	Special Weather Statement	DMX	Sac	47 min
Jul 11, 8:29 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	46 min
Jul 11, 9:07 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	38 min
Jul 11, 9:11 PM CDT	Special Weather Statement	DMX	Pocahontas	49 min
Jul 11, 9:29 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Greene, Sac	46 min
Jul 11, 9:41 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas, Sac, Webster	34 min
Jul 11, 9:45 PM CDT	Special Weather Statement	DMX	Audubon, Guthrie	45 min
Jul 11, 10:10 PM CDT	Special Weather Statement	DMX	Boone, Greene, Hamilton, Webster	50 min
Jul 11, 10:50 PM CDT	Special Weather Statement	DMX	Polk, Story	40 min
Jul 11, 11:24 PM CDT	Special Weather Statement	DMX	Butler, Grundy, Hardin	51 min
Jul 11, 11:26 PM CDT	Special Weather Statement	DMX	Worth	34 min
Jul 11, 11:29 PM CDT	Special Weather Statement	DMX	Jasper, Marion	46 min
Jul 11, 11:51 PM CDT	Special Weather Statement	DMX	Marshall	24 min

Nearby

Special Weather Statements in Iowa, 2016 Every special weather statement in 2016

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.