Alert archive / Iowa / Special Weather Statements in 2016

Special Weather Statement, NWS Quad Cities, IA

August 4, 2016Benton County, Iowa

NWS Quad Cities, IA issued this special weather statement at Aug 4, 2016, 5:28 PM CDT for Benton County, Iowa. It was in force for 32 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 4, 2016, 5:28 PM CDT (22:28 UTC)
Expired
Aug 4, 2016, 6:00 PM CDT
In force
32 min
Issued by
NWS Quad Cities, IA

County Benton County, IA

The radar

The Des Moines radar (KDMX), 138 km from the middle of the area, began a volume at 22:29 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, 10.5 hours before the alert went out and 144 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2016-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 500 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2016-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
500 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
970 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
98 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 Quad Cities, IA wrote its last area forecast discussion before this special weather statement went out at Aug 4, 3:40 PM CDT, 1 hour 48 minutes earlier.

Area forecast discussion, Aug 4, 3:40 PM CDT, 1 hour 48 minutes before
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Hazardous weather outlook, Aug 4, 4:14 PM CDT, 1 hour 14 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
414 PM CDT THU AUG 4 2016

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-051000-
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-
414 PM CDT THU AUG 4 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

TEMPERATURES IN THE UPPER 80S TO LOW 90S...COMBINED WITH HIGH
HUMIDITY...WILL CREATE LATE AFTERNOON AND EARLY EVENING HEAT
INDICES IN THE UPPER 90S TO LOWER 100 DEGREE RANGE. THERE WILL BE
LOCALIZED AREAS AROUND 105 DEGREES IN SOUTHEASTERN IOWA THROUGH 6
PM CDT.

THUNDERSTORMS ARE STILL EXPECTED TO MOVE INTO EASTERN IOWA THROUGH
EARLY EVENING...AND THEN SPREAD EAST AND SOUTHEAST ACROSS THE
ENTIRE AREA AS THE EVENING PROGRESSES INTO THE OVERNIGHT AS A
COLD FRONT PUSHES INTO THE REGION FROM THE WEST. WITH ALL THE HEAT
AND HUMIDITY IN PLACE...THE CHANCE FOR SOME SEVERE STORMS
CONTINUES THROUGH THE EVENING ESPECIALLY NORTHWEST OF A
FREEPORT...TO QUAD CITIES...TO WASHINGTON IOWA LINE. THE MAIN
THREATS WILL BE DAMAGING WIND GUSTS AND LOCALLY HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SEVERAL ROUNDS OF THUNDERSTORMS ARE POSSIBLE MAINLY SUNDAY THROUGH
WEDNESDAY. THE SEVERE WEATHER THREAT APPEARS LOW...BUT LOCALLY HEAVY
RAIN MAY BE POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON AND EVENING,
ESPECIALLY IN EASTERN IOWA.

12

In the hours before

Special weather statement, Aug 4, 1:31 PM CDT, 3 hours 57 minutes before
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Special weather statement, Aug 4, 1:52 PM CDT, 3 hours 36 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
152 PM CDT THU AUG 4 2016

IAZ063>068-076>078-087>089-098-099-ILZ015-016-024>026-034-035-
MOZ009-010-042300-
IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-
LOUISA-JEFFERSON-HENRY IA-DES MOINES-VAN BUREN-LEE-ROCK ISLAND-
HENRY IL-MERCER-HENDERSON-WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK-
INCLUDING THE CITIES OF...MARENGO...IOWA CITY...TIPTON...
CLINTON...MUSCATINE...DAVENPORT...BETTENDORF...SIGOURNEY...
WASHINGTON...WAPELLO...FAIRFIELD...MOUNT PLEASANT...BURLINGTON...
KEOSAUQUA...FORT MADISON...MOLINE...ROCK ISLAND...GENESEO...
ALEDO...OQUAWKA...MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...KAHOKA
152 PM CDT THU AUG 4 2016

...VERY WARM AND MUGGY INTO THE EARLY EVENING...

TEMPERATURES IN THE UPPER 80S TO LOWER 90S COUPLED WITH DEWPOINTS
IN THE MID TO UPPER 70S WILL CREATE PEAK HEAT INDICES IN THE UPPER
90S TO LOW 100S. THE EXTREMELY HUMID CONDITIONS WILL RESULT IN AN
INCREASED RISK FOR HEAT EXHAUSTION FOR THOSE WORKING OR RECREATING
OUTDOORS THIS AFTERNOON AND EVENING. CONDITIONS WILL IMPROVE AFTER
6 OR 7 PM AS TEMPERATURES SLOWLY FALL THROUGH THE 80S.

PLEASE USE EXTRA CAUTION IF YOU MUST BE OUTSIDE AND DRINK PLENTY
OF WATER. THOSE MOST SUSCEPTIBLE TO THE HEAT ARE YOUNG CHILDREN,
ELDERLY, AND PETS.

UTTECH
Special weather statement, Aug 4, 3:37 PM CDT, 1 hour 51 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
337 PM CDT THU AUG 4 2016

IAZ052-063>068-076>078-087>089-098-099-ILZ009-015-016-024>026-034-
035-MOZ009-010-042345-
LINN-IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-
LOUISA-JEFFERSON-HENRY IA-DES MOINES-VAN BUREN-LEE-WHITESIDE-
ROCK ISLAND-HENRY IL-MERCER-HENDERSON-WARREN-HANCOCK-MCDONOUGH-
SCOTLAND-CLARK-
INCLUDING THE CITIES OF...CEDAR RAPIDS...MARENGO...IOWA CITY...
TIPTON...CLINTON...MUSCATINE...DAVENPORT...BETTENDORF...
SIGOURNEY...WASHINGTON...WAPELLO...FAIRFIELD...MOUNT PLEASANT...
BURLINGTON...KEOSAUQUA...FORT MADISON...STERLING...MOLINE...
ROCK ISLAND...GENESEO...ALEDO...OQUAWKA...MONMOUTH...CARTHAGE...
MACOMB...MEMPHIS...KAHOKA
337 PM CDT THU AUG 4 2016

...VERY WARM AND MUGGY INTO THE EARLY EVENING...

TEMPERATURES IN THE UPPER 80S TO LOWER 90S COUPLED WITH DEWPOINTS
IN THE MID TO UPPER 70S WILL CREATE PEAK HEAT INDICES IN THE UPPER
90S TO LOW 100S...WITH LOCALIZED AREAS AROUND 105 IN SOUTHEAST
IOWA. THE EXTREMELY HUMID CONDITIONS WILL RESULT IN AN INCREASED
RISK FOR HEAT EXHAUSTION FOR THOSE WORKING OR RECREATING OUTDOORS
THIS AFTERNOON AND EVENING. CONDITIONS WILL IMPROVE AFTER 6 OR
7 PM AS TEMPERATURES SLOWLY FALL THROUGH THE 80S.

PLEASE USE EXTRA CAUTION IF YOU MUST BE OUTSIDE AND DRINK PLENTY
OF WATER. THOSE MOST SUSCEPTIBLE TO THE HEAT ARE YOUNG CHILDREN,
ELDERLY, AND PETS.

UTTECH
Special weather statement, Aug 4, 5:28 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
528 PM CDT THU AUG 4 2016

IAC011-042300-
BENTON-
528 PM CDT THU AUG 4 2016

...A STRONG THUNDERSTORM WILL AFFECT BENTON COUNTY UNTIL 615 PM
CDT...

AT 527 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 8 MILES WEST OF
KEYSTONE...OR 12 MILES EAST OF TOLEDO...MOVING EAST AT 35 MPH.

WIND GUSTS UP TO 50 MPH AND HALF INCH HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
VINTON...BELLE PLAINE...ATKINS...URBANA...DYSART...SHELLSBURG...
NEWHALL...BLAIRSTOWN...VAN HORNE...KEYSTONE...NORWAY...GARRISON...
MOUNT AUBURN...LUZERNE...VINTON MEMORIAL AIRPORT...
BENTON COUNTY FAIRGROUNDS...CHENEY...HOEFLE-DULIN PARK...
MINNE ESTEMA PARK AND RODGERS PARK.

THIS INCLUDES INTERSTATE 380 BETWEEN MILE MARKERS 43 AND 48.

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

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO
STATIONS AND AVAILABLE TELEVISION STATIONS FOR ADDITIONAL INFORMATION
AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
NORTHEASTERN AND EAST CENTRAL IOWA.

LAT...LON 4221 9230 4230 9199 4230 9189 4191 9184
      4186 9225 4186 9230
TIME...MOT...LOC 2227Z 250DEG 35KT 4203 9235

12

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 1:31 PM CDTSpecial Weather StatementDVNBenton, Buchanan59 min
Aug 4, 6:39 PM CDTSpecial Weather StatementDVNBuchanan36 min
Aug 4, 6:53 PM CDTSevere Thunderstorm WarningDVNBuchanan, Delaware52 min

Nearby

Special Weather Statements in Iowa, 2016Every 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.