Alert archive / Iowa / Special Weather Statements in 2015

Special Weather Statement, NWS Quad Cities, IA

September 18, 20155 counties in Iowa

NWS Quad Cities, IA issued this special weather statement at Sep 18, 2015, 7:36 PM CDT for 5 counties in Iowa. It was in force for 24 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 18, 2015, 7:36 PM CDT (00:36 UTC)
Expired: Sep 18, 2015, 8:00 PM CDT
In force: 24 min
Issued by: NWS Quad Cities, IA

Counties Henry County, IA, Jefferson County, IA, Johnson County, IA, Louisa County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 108 km from the middle of the area, began a volume at 00:37 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

Lincoln, IL (KILX), launched 00:00Z, 0.6 hours before the alert went out and 292 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: 905 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 285 m²/s²
0-3 km storm-relative helicity: 497 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

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 Quad Cities, IA wrote its last area forecast discussion before this special weather statement went out at Sep 18, 6:32 PM CDT, 1 hour 4 minutes earlier.

Area forecast discussion, Sep 18, 6:32 PM CDT, 1 hour 4 minutes before

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Hazardous weather outlook, Sep 18, 4:16 AM CDT, 15 hours 20 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
416 AM CDT FRI SEP 18 2015

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-191100-
BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-
CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-
HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL-
WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON-
WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK-
416 AM CDT FRI SEP 18 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST
CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST
MISSOURI.

.DAY ONE...TODAY AND TONIGHT

SEVERE STORMS ARE POSSIBLE LATE THIS AFTERNOON AND
TONIGHT...MAINLY ALONG AND SOUTH OF INTERSTATE 80. ALL TYPES OF
SEVERE WEATHER WILL BE POSSIBLE...INCLUDING AN ISOLATED TORNADO.
LOCALLY HEAVY RAINFALL IS ALSO FORECAST THROUGH TONIGHT...AND
FLASH FLOODING IS POSSIBLE...ESPECIALLY ACROSS AREAS AFFECTED BY
HEAVY RAIN THURSDAY AND THURSDAY NIGHT. A FLASH FLOOD WATCH IS IN
EFFECT FOR LOCATIONS NORTH OF A LINE FROM ALEDO TO PRINCETON.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT.

RP KINNEY

In the hours before

Special weather statement, Sep 18, 3:22 PM CDT, 4 hours 14 minutes before

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Local storm report, Sep 18, 3:43 PM CDT, 3 hours 53 minutes before

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Local storm report, Sep 18, 3:55 PM CDT, 3 hours 41 minutes before

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Local storm report, Sep 18, 6:14 PM CDT, 1 hour 22 minutes before

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Local storm report, Sep 18, 7:15 PM CDT, 21 minutes before

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Special weather statement, Sep 18, 7:36 PM CDT, 0 minutes before

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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 18, 8:02 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Louisa, Muscatine	58 min
Sep 18, 8:50 PM CDT	Special Weather Statement	DVN	Muscatine, Scott	55 min
Sep 19, 6:33 AM CDT	River Flood Warning	DVN	Johnson, Washington	64 hr
Sep 18, 9:24 PM CDT	Special Weather Statement	DVN	Henry	21 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.