Alert archive / Iowa / Special Weather Statements in 2016

Special Weather Statement, NWS Quad Cities, IA

August 29, 2016Clinton County, Scott County, Iowa

NWS Quad Cities, IA issued this special weather statement at Aug 29, 2016, 3:17 PM CDT for Clinton County, Scott County, Iowa. It was in force for 28 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: Aug 29, 2016, 3:17 PM CDT (20:17 UTC)
Expired: Aug 29, 2016, 3:45 PM CDT
In force: 28 min
Issued by: NWS Quad Cities, IA

Counties Clinton County, IA, Scott County, IA

The radar

The Quad Cities radar (KDVN), 16 km from the middle of the area, began a volume at 20:16 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 12:00Z, 8.3 hours before the alert went out and 17 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: 959 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 891 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 Aug 29, 3:13 PM CDT, 4 minutes earlier.

Area forecast discussion, Aug 29, 3:13 PM CDT, 4 minutes before

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Hazardous weather outlook, Aug 29, 4:06 AM CDT, 11 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
406 AM CDT MON AUG 29 2016

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-300915-
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-
406 AM CDT MON AUG 29 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...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE POSSIBLE ACROSS THE OUTLOOK AREA
TODAY AND TONIGHT. THE MAIN THREAT FROM THESE STORMS WILL BE HEAVY
RAINFALL...WHICH MAY LEAD TO LOCALIZED FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

SCATTERED THUNDERSTORMS ARE POSSIBLE ON TUESDAY AND WEDNESDAY ACROSS
THE AREA. THE MAIN THREAT FROM THESE STORMS WOULD BE HEAVY
RAINFALL AND LIGHTNING. AT THIS TIME SEVERE WEATHER IS NOT
EXPECTED.

RISES ON SEVERAL AREA RIVERS WILL CONTINUE THIS WEEK. MINOR FLOODING
IS POSSIBLE ON PORTIONS OF THE CEDAR AND WAPSIPINICON RIVERS...AS
WELL AS THE MISSISSIPPI DOWNSTREAM OF NEW BOSTON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT TODAY OR TONIGHT. HOWEVER...REPORTS OF
HEAVY RAINFALL OR FLASH FLOODING WILL BE APPRECIATED.

SHEETS/GIBBS

In the hours before

Special weather statement, Aug 29, 2:11 PM CDT, 1 hour 6 minutes before

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Special weather statement, Aug 29, 2:47 PM CDT, 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
247 PM CDT MON AUG 29 2016

IAZ052-053-292100-
LINN-JONES-
INCLUDING THE CITIES OF...CEDAR RAPIDS...ANAMOSA
247 PM CDT MON AUG 29 2016

...SLOW MOVING THUNDERSTORMS...

AT 240 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS NEAR WALKER...TROY MILLS AND COGGON IN LINN
COUNTY...AND NEAR CENTER JUNCTION IN JONES COUNTY. THESE STORMS
WERE DRIFTING SLOWLY EASTWARD...AND WILL BRING TORRENTIAL RAIN
WITH LOCALIZED AMOUNTS OF 1 TO 3 INCHES LIKELY. THIS AMOUNT OF
HEAVY RAIN WILL PRODUCE PONDING OF WATER ON ROADWAYS AND LEAD TO
MINOR FLOODING OF DITCHES AND OTHER POORLY DRAINED AREAS...WITH
RISES ON SMALL STREAMS AND CREEKS POSSIBLE. IF YOU ENCOUNTER WATER
OVER A ROADWAY...DO NOT DRIVE INTO IT. IN ADDITION TO THE HEAVY
RAIN...VISIBILITIES WILL BE GREATLY REDUCED. THE STRONGEST STORMS
MAY ALSO BE CAPABLE OF PRODUCING GUSTY WINDS OF 30 TO 40 MPH AND
HAIL UP TO NICKEL SIZE.

Local storm report, Aug 29, 2:48 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
248 PM CDT MON AUG 29 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0247 PM     HEAVY RAIN       SSE WALKER              42.28N 91.78W
08/29/2016  M2.50 INCH       LINN               IA   TRAINED SPOTTER

            TOTAL SINCE 1 PM.

&&

DC

Special weather statement, Aug 29, 2:56 PM CDT, 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
256 PM CDT MON AUG 29 2016

ILC073-131-292130-
HENRY-MERCER-
256 PM CDT MON AUG 29 2016

...AN AREA OF THUNDERSTORMS WITH TORRENTIAL RAINS WILL AFFECT
SOUTHWESTERN HENRY AND SOUTHEASTERN MERCER COUNTIES UNTIL 430 PM
CDT...

AT 253 PM CDT...THUNDERSTORMS WITH VERY HEAVY RAINS WERE CLUSTERED
ACROSS THE SOUTHEAST HALF OF MERCER COUNTY...MOVING NORTHEAST AT 5
MPH.

LOCATIONS IMPACTED INCLUDE...
BURGESS...VIOLA...WOODHULL...ALPHA...SEATON...NORTH HENDERSON...NEW
WINDSOR...ALEXIS...OPHIEM...GRIFFIN...GILCHRIST AND SUNBEAM.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 4115 9044 4107 9044 4106 9047 4107 9077
      4111 9089 4130 9037 4115 9026
TIME...MOT...LOC 1953Z 230DEG 6KT 4114 9055

BROOKS

Special weather statement, Aug 29, 3:11 PM CDT, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
311 PM CDT MON AUG 29 2016

ILC195-292145-
WHITESIDE-
311 PM CDT MON AUG 29 2016

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT EAST CENTRAL WHITESIDE
COUNTY UNTIL 445 PM CDT...

AT 309 PM CDT...STRONG THUNDERSTORMS WERE CLUSTERED OVER EAST
CENTRAL WHITESIDE COUNTY, OVER ROCK FALLS AND COMO. THE STORMS ARE
NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...
STERLING...ROCK FALLS...AGNEW...YEOWARD ADDITION...DOUGLAS PARK...
GALT...WHITESIDE COUNTY AIRPORT...GRIMES ADDITION AND COMO.

THIS INCLUDES INTERSTATE 88 BETWEEN MILE MARKERS 34 AND 44.

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

LAT...LON 4165 8973 4178 8984 4183 8963 4166 8963
TIME...MOT...LOC 2009Z 150DEG 1KT 4173 8969

BROOKS

Special weather statement, Aug 29, 3:17 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
317 PM CDT MON AUG 29 2016

IAC045-163-292045-
CLINTON-SCOTT-
317 PM CDT MON AUG 29 2016

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL CLINTON AND NORTH
CENTRAL SCOTT COUNTIES UNTIL 345 PM CDT...

AT 316 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR LONG
GROVE...OR 12 MILES NORTH OF DAVENPORT...MOVING NORTH AT 40 MPH.

WINDS IN EXCESS OF 40 MPH AND SMALL HAIL IS LIKELY WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
ELDRIDGE...DEWITT...LONG GROVE...GRAND MOUND...DONAHUE...WELTON...
PARK VIEW...SCOTT COUNTY PARK AND CLINTON COUNTY FAIRGROUNDS.

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

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 4163 9056 4166 9072 4193 9070 4192 9045
TIME...MOT...LOC 2016Z 190DEG 35KT 4174 9061

05

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 9:54 AM CDT	River Flood Watch	DVN	Louisa	5 days
Aug 29, 10:40 AM CDT	River Flood Warning	DVN	Des Moines	7 days
Aug 29, 10:40 AM CDT	River Flood Warning	DVN	Des Moines, Lee	6 days
Aug 29, 10:40 AM CDT	River Flood Warning	DVN	Cedar, Louisa, Muscatine	5 days
Aug 29, 1:17 PM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Jones, Linn	3 hr
Aug 29, 3:40 PM CDT	Special Weather Statement	DVN	Clinton	35 min
Aug 29, 5:06 PM CDT	Special Weather Statement	DVN	Benton	54 min
Aug 29, 5:50 PM CDT	Special Weather Statement	DVN	Benton	55 min
Aug 29, 6:26 PM CDT	Special Weather Statement	DVN	Van Buren	49 min
Aug 29, 6:43 PM CDT	Flash Flood Warning	DVN	Van Buren	6 hr
Aug 29, 2:56 PM CDT	Special Weather Statement	DVN	Mercer	94 min
Aug 29, 3:11 PM CDT	Special Weather Statement	DVN	Whiteside	94 min
Aug 29, 3:45 PM CDT	Special Weather Statement	DVN	Bureau	90 min
Aug 29, 4:53 PM CDT	Special Weather Statement	DVN	Bureau	82 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.