Alert archive / Illinois / Special Weather Statements in 2012

Special Weather Statement, NWS Quad Cities, IA

April 15, 20125 counties in Iowa; 6 counties in Illinois; Clark County, Missouri

NWS Quad Cities, IA issued this special weather statement at Apr 15, 2012, 5:59 PM CDT for 5 counties in Iowa; 6 counties in Illinois; Clark County, Missouri. It was in force for 2 hr. 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 15, 2012, 5:59 PM CDT (22:59 UTC)
Expired: Apr 15, 2012, 8:00 PM CDT
In force: 2 hr
Issued by: NWS Quad Cities, IA

Counties Des Moines County, IA, Henry County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Hancock County, IL, Henderson County, IL, McDonough County, IL, Mercer County, IL, Rock Island County, IL, Warren County, IL, Clark County, MO

The radar

The Quad Cities radar (KDVN), 98 km from the middle of the area, began a volume at 23:00 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

Lincoln, IL (KILX), launched 12:00Z, 11.0 hours before the alert went out and 213 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: 17 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 1124 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 404 m²/s²
0-3 km storm-relative helicity: 425 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 Quad Cities, IA wrote its last area forecast discussion before this special weather statement went out at Apr 15, 3:37 PM CDT, 2 hours 22 minutes earlier.

Area forecast discussion, Apr 15, 3:37 PM CDT, 2 hours 22 minutes before

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Hazardous weather outlook, Apr 15, 9:05 AM CDT, 8 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
905 AM CDT SUN APR 15 2012

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-161415-
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-
905 AM CDT SUN APR 15 2012

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

THE STORM PREDICTION CENTER IS FORECASTING A MODERATE RISK FOR
SEVERE STORMS TODAY OVER MUCH OF EASTERN IOWA AND FAR NORTHWEST
ILLINOIS. A SLIGHT RISK IS FORECAST FOR LOCATIONS FARTHER SOUTH
AND EAST. TODAY WILL SEE SEVERAL ROUNDS OF SHOWERS AND STRONG TO
SEVERE THUNDERSTORMS. NON SEVERE ACTIVITY WILL MOVE IN FROM
MISSOURI AND CENTRAL IOWA THIS MORNING. THEN...AFTERNOON AND
EVENING THUNDERSTORMS ARE EXPECTED TO FORM IN EASTERN IOWA AND
ILLINOIS. THIS MORNING SMALL HAIL AND HEAVY RAINFALL ARE POSSIBLE. THIS
AFTERNOON AND EVENING WILL SEE THE POTENTIAL FOR SIGNIFICANT
DAMAGING WINDS...LARGE HAIL...AND TORNADOES. SUPERCELL
THUNDERSTORMS MAY FORM AFTER NOON...AND MOVE NORTHEAST VERY
RAPIDLY...AROUND 50 TO 60 MPH.

IN ADDITION TO THE POTENTIAL FOR SEVERE STORMS...TODAY WILL BE
VERY WINDY...WITH SUSTAINED SOUTH WINDS OF 25 TO 35 MPH...AND
GUSTS TO 45 TO 55 MPH DURING THE AFTERNOON AND EARLY EVENING. A
WIND ADVISORY HAS BEEN ISSUED THROUGH THIS EVENING FOR ALL OF THE
OUTLOOK AREA.

TODAY IS A CHALLENGING...AND CHANGEABLE SEVERE WEATHER DAY. STAY
IN TOUCH WITH A WEATHER INFORMATION SOURCE TODAY.

A CONFERENCE CALL FOR EMERGENCY MANAGERS WILL BE CONDUCTED TODAY
AT 100 PM.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THUNDERSTORMS ARE POSSIBLE ON WEDNESDAY AND AGAIN THURSDAY INTO
THURSDAY NIGHT. HOWEVER IT IS STILL TOO EARLY TO DETERMINE ANY
SEVERE WEATHER THREAT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS EXPECTED TODAY AND TONIGHT.

ERVIN/STOFLET/LE

In the hours before

Local storm report, Apr 15, 1:25 PM CDT, 4 hours 34 minutes before

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Special weather statement, Apr 15, 2:56 PM CDT, 3 hours 3 minutes before

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Special weather statement, Apr 15, 3:37 PM CDT, 2 hours 22 minutes before

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Special weather statement, Apr 15, 4:18 PM CDT, 1 hour 41 minutes before

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Special weather statement, Apr 15, 5:16 PM CDT, 43 minutes before

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Special weather statement, Apr 15, 5:59 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
Apr 14, 9:03 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Louisa, Muscatine, Scott	43 min
Apr 14, 9:14 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Johnson, Keokuk, Linn, Washington	61 min
Apr 14, 9:26 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Keokuk, Washington	64 min
Apr 14, 9:38 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Cedar, Iowa, Johnson, Jones, Keokuk and 4 more	55 min
Apr 14, 9:55 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Jefferson, Keokuk, Louisa, Washington	65 min
Apr 15, 12:31 AM CDT	Special Weather Statement	DVN	Scott	74 min
Apr 15, 3:28 AM CDT	Wind Advisory	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more	19 hr
Apr 15, 11:10 AM CDT	River Flood Warning	DVN	Johnson, Washington	22 hr
Apr 15, 2:56 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Lee, Van Buren	64 min
Apr 15, 3:37 PM CDT	Special Weather Statement	DVN	Clinton, Des Moines, Louisa, Muscatine, Scott	53 min
Apr 15, 4:18 PM CDT	Special Weather Statement	DVN	Cedar, Des Moines, Henry, Lee, Louisa, Muscatine and 2 more	57 min
Apr 15, 5:16 PM CDT	Special Weather Statement	DVN	Clinton, Des Moines, Henry, Lee, Louisa, Muscatine and 1 more	59 min
Apr 15, 1:02 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry, Rock Island, Whiteside	38 min

Nearby

Special Weather Statements in Illinois, 2012 Special Weather Statements in Iowa, 2012 Special Weather Statements in Missouri, 2012 Every special weather statement in 2012

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.