Alert archive / Iowa / Special Weather Statements in 2016

Special Weather Statement, NWS Quad Cities, IA

September 8, 20164 counties in Iowa; Carroll County, Whiteside County, Illinois

NWS Quad Cities, IA issued this special weather statement at Sep 8, 2016, 2:20 AM CDT for 4 counties in Iowa; Carroll County, Whiteside County, Illinois. It was in force for 55 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 8, 2016, 2:20 AM CDT (07:20 UTC)
Expired: Sep 8, 2016, 3:15 AM CDT
In force: 55 min
Issued by: NWS Quad Cities, IA

Counties Cedar County, IA, Clinton County, IA, Johnson County, IA, Scott County, IA, Carroll County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 31 km from the middle of the area, began a volume at 07:22 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, 7.3 hours before the alert went out and 34 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: 378 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 762 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

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 Quad Cities, IA wrote its last area forecast discussion before this special weather statement went out at Sep 7, 11:40 PM CDT, 2 hours 40 minutes earlier.

Area forecast discussion, Sep 7, 11:40 PM CDT, 2 hours 40 minutes before

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Hazardous weather outlook, Sep 7, 3:26 PM CDT, 10 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
326 PM CDT WED SEP 7 2016

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-082030-
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-
326 PM CDT WED SEP 7 2016

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...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS CAN BE EXPECTED THIS AFTERNOON AND TONIGHT THAT WILL
BE CAPABLE OF PRODUCING HEAVY RAINFALL. IF THUNDERSTORMS MOVE
OVER THE SAME AREAS...LOCALIZED FLASH FLOODING IS POSSIBLE. A
FLASH FLOOD WATCH IS IN EFFECT UNTIL THURSDAY MORNING FOR AREAS
ALONG AND NORTH OF A SIGOURNEY...IOWA TO ALEDO ILLINOIS LINE.

THERE IS A SLIGHT RISK OF SEVERE STORMS THIS AFTERNOON AND
EVENING...MAINLY ALONG AND EAST OF THE MISSISSIPPI. WEST OF THE
MISSISSIPPI...THERE IS A MARGINAL RISK OF SEVERE STORMS.

IF SEVERE STORMS DO DEVELOP...THE PRIMARY THREAT WOULD BE DAMAGING
WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

FRIDAY AND FRIDAY NIGHT...ANOTHER ROUND OF THUNDERSTORMS IS
POSSIBLE IN ASSOCIATION WITH A WARM FRONT AND EVENTUALLY A COLD
FRONT. THE GREATEST THREATS ARE VERY HEAVY RAINFALL RATES AND
LOCALIZED FLASH FLOODING...ESPECIALLY SOUTH OF INTERSTATE 80.
THERE IS ALSO A MARGINAL RISK FOR SEVERE STORMS IN THE COUNTIES
ALONG AND SOUTH OF INTERSTATE 80.

DEPENDING ON HOW MUCH RAIN FALLS...SOME AREA RIVERS MAY
EXPERIENCE RAPID RISES AND A RENEWED THREAT FOR FLOODING FROM
TODAY INTO THE WEEKEND.

MONDAY INTO TUESDAY...THERE IS A CHANCE FOR THUNDERSTORMS ALONG
AND AHEAD OF A COLD FRONT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THROUGH TONIGHT...FOR REPORTS OF
ISOLATED STRONG WIND GUSTS...FLASH FLOODING...AND HEAVY RAINFALL.

In the hours before

Local storm report, Sep 7, 10:09 PM CDT, 4 hours 11 minutes before

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Local storm report, Sep 7, 11:44 PM CDT, 2 hours 36 minutes before

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Special weather statement, Sep 8, 12:41 AM CDT, 1 hour 39 minutes before

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Special weather statement, Sep 8, 1:25 AM CDT, 55 minutes before

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Special weather statement, Sep 8, 1:53 AM CDT, 27 minutes before

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Special weather statement, Sep 8, 2:20 AM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
220 AM CDT THU SEP 8 2016

ILC015-161-195-IAC031-045-097-103-105-113-163-080815-
ROCK
ISLAND-CARROLL-WHITESIDE-CLINTON-JONES-JOHNSON-LINN-JACKSON-CEDAR-
SCOTT-
220 AM CDT THU SEP 8 2016

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN ROCK
ISLAND...SOUTHEASTERN CARROLL...WHITESIDE...CLINTON...SOUTHERN
JONES...NORTHERN JOHNSON...SOUTHEASTERN LINN...SOUTHERN JACKSON...
CEDAR AND SCOTT COUNTIES UNTIL 315 AM CDT...

AT 219 AM CDT...STRONG THUNDERSTORMS WERE CLUSTERED FROM
IOWA CITY...TO CLINTON AND STERLING...MOVING EAST AT 45 MPH.

EXTREME RAINFALL RATES OF 1 TO 2 INCHES PER HOUR CAN BE EXPECTED
OVER MOST OF THE AREA.  ADDITIONALLY...WINDS IN EXCESS OF 40 MPH ARE
POSSIBLE. EXPECT PONDING WATER ON STREETS AND ROADS...AND LOW
VISIBILITY IN HEAVY RAIN.

LOCATIONS IMPACTED INCLUDE...
IOWA CITY...CLINTON...STERLING...ROCK FALLS...MAQUOKETA...MORRISON...
TIPTON...WEST BRANCH...MECHANICSVILLE...STANWOOD...CORALVILLE...
NORTH LIBERTY...ELDRIDGE...DEWITT...MOUNT VERNON...CAMANCHE...
FULTON...SAVANNA...LISBON AND PROPHETSTOWN.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 80 IN IOWA BETWEEN MILE MARKERS 231 AND 284.
 INTERSTATE 380 BETWEEN MILE MARKERS 1 AND 11.
 INTERSTATE 88 BETWEEN MILE MARKERS 11 AND 44.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 4162 9181 4186 9177 4186 9152 4210 9152
      4207 8968 4193 8969 4193 8963 4161 8963
TIME...MOT...LOC 0719Z 267DEG 41KT 4182 9136

RP KINNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 7:15 PM CDT	Special Weather Statement	DVN	Des Moines, Lee	60 min
Sep 7, 7:56 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines	28 min
Sep 7, 8:01 PM CDT	Tornado Warning	DVN	Des Moines	29 min
Sep 7, 8:36 PM CDT	Flash Flood Warning	DVN	Des Moines	6 hr
Sep 8, 12:41 AM CDT	Special Weather Statement	DVN	Benton, Cedar, Iowa, Johnson, Jones, Linn	64 min
Sep 8, 1:25 AM CDT	Special Weather Statement	DVN	Clinton, Scott	50 min
Sep 8, 1:34 AM CDT	Flash Flood Warning	DVN	Linn	4 hr
Sep 8, 1:53 AM CDT	Special Weather Statement	DVN	Cedar, Johnson	22 min
Sep 8, 6:33 AM CDT	River Flood Warning	DVN	Clinton, Scott	68 hr

Nearby

Special Weather Statements in Iowa, 2016 Special Weather Statements in Illinois, 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.