Alert archive / Illinois / Special Weather Statements in 2014

Special Weather Statement, NWS Quad Cities, IA

August 4, 2014Henderson County, Warren County, Illinois

NWS Quad Cities, IA issued this special weather statement at Aug 4, 2014, 5:30 PM CDT for Henderson County, Warren County, Illinois. It was in force for 60 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, 2014, 5:30 PM CDT (22:30 UTC)
Expired
Aug 4, 2014, 6:30 PM CDT
In force
60 min
Issued by
NWS Quad Cities, IA

Counties Henderson County, IL, Warren County, IL

The radar

The Quad Cities radar (KDVN), 80 km from the middle of the area, began a volume at 22:32 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 82 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 2014-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 95 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 2014-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 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
95 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
1385 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
61 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 Aug 4, 3:22 PM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Aug 4, 3:22 PM CDT, 2 hours 8 minutes before
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Hazardous weather outlook, Aug 4, 5:04 AM CDT, 12 hours 26 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
504 AM CDT MON AUG 4 2014

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-051015-
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-
504 AM CDT MON AUG 4 2014

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 WILL DEVELOP TODAY WITH A FEW POSSIBLY IN
THE MORNING BUT BECOMING MORE NUMEROUS IN THE AFTERNOON AND EARLY
EVENING. THE MAIN THREATS WITH THESE THUNDERSTORMS WILL BE
LIGHTNING AND LOCALLY HEAVY RAIN...THE LATTER DUE TO THE SLOW
MOVING NATURE EXPECTED FROM THESE STORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ISOLATED TO SCATTERED THUNDERSTORMS WILL AGAIN BE POSSIBLE ON
TUESDAY...BUT A MORE WIDESPREAD THREAT WILL OCCUR LATE TUESDAY
NIGHT INTO WEDNESDAY WHEN A LARGER COMPLEX OF THUNDERSTORMS MOVES
ACROSS THE REGION. WHILE ORGANIZED SEVERE THUNDERSTORMS DO NOT
APPEAR TO BE A THREAT AT THIS TIME...THERE ARE SIGNS THAT THIS
SYSTEM MAY BE ABLE TO PRODUCE HEAVY RAINFALL. DEPENDING ON WHERE
THIS SYSTEM EVENTUALLY TRACKS...IT WILL HAVE THE POTENTIAL TO
PRODUCE WIDESPREAD ONE OR MORE INCHES OF RAIN BY WEDNESDAY
EVENING. HEAVY RAINFALL AT HIGH RATES MAY BE ABLE TO PRODUCE URBAN
AND SMALL STREAM FLOODING.

MORE THUNDERSTORMS WILL BE POSSIBLE ACROSS PORTIONS OF THE OUTLOOK
AREA SOUTH OF INTERSTATE 80 ON THURSDAY. THE THREAT FOR SEVERE
WEATHER WITH THESE STORMS APPEARS LOW AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED TODAY...ALTHOUGH REPORTS OF RAINFALL
AMOUNTS IN EXCESS OF ONE INCH WOULD BE APPRECIATED.

WOLF/12

In the hours before

Special weather statement, Aug 4, 5:04 PM CDT, 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
504 PM CDT MON AUG 4 2014

IAZ041-042-053-054-065-066-068-ILZ001-002-007-009-015-050100-
DELAWARE-DUBUQUE-JONES-JACKSON-CEDAR-CLINTON-SCOTT-JO DAVIESS-
STEPHENSON-CARROLL-WHITESIDE-ROCK ISLAND-
INCLUDING THE CITIES OF...MANCHESTER...DUBUQUE...ANAMOSA...
MAQUOKETA...TIPTON...CLINTON...BETTENDORF...DAVENPORT...GALENA...
FREEPORT...MOUNT CARROLL...STERLING...ROCK FALLS...MOLINE...
ROCK ISLAND
504 PM CDT MON AUG 4 2014

...THUNDERSTORMS AND SHOWERS TO IMPACT REGION THROUGH 8 PM...

A DEVELOPING AREA OF THUNDERSTORMS AND SHOWERS IN NORTHEAST IOWA
AND SOUTHERN WISCONSIN IS MOVING SOUTHEAST AT 20 TO 25 MPH. MOST
LOCATIONS WILL PICK UP LIGHT TO LOCALLY MODERATE RAINFALL TOTALS
OF A TENTH TO LOCALLY OVER A HALF INCH OF RAIN THROUGH 8 PM. THE
STRONGEST STORMS MAY PRODUCE A PERIOD OF HEAVY RAIN...GUSTY WINDS
UP TO 30 MPH AND POSSIBLE PEA SIZED HAIL. ISOLATED RAIN TOTALS OF
AROUND AN 1 INCH MAY ALSO OCCUR IN THE STRONGEST STORMS...THIS MAY
RESULT IN MINOR PONDING ISSUES IN FAVORED LOW LYING AREAS FOR AN
HOUR OR LESS.

NICHOLS
Special weather statement, Aug 4, 5:30 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
530 PM CDT MON AUG 4 2014

IAZ089-ILZ024>026-042330-
DES MOINES-HENDERSON-MERCER-WARREN-
530 PM CDT MON AUG 4 2014

...STRONG THUNDERSTORM POSSIBLE...

AT 527 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR BIGGSVILLE...OR 8 MILES SOUTHEAST OF
OQUAWKA...MOVING EAST AT 25 MPH.

* THE THUNDERSTORM WILL BE NEAR...
  KIRKWOOD AROUND 540 PM CDT...
  MONMOUTH AROUND 555 PM CDT...

PEA SIZE HAIL...WINDS GREATER THAN 35 MPH...FREQUENT CLOUD TO GROUND
LIGHTNING...BRIEF HEAVY RAIN...ARE EXPECTED WITH THIS STORM.

SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

EXPECT PONDING OF WATER ON ROADS AND IN LOW-LYING AREAS.

LAT...LON 4095 9096 4114 9044 4075 9044 4074 9094
TIME...MOT...LOC 2229Z 257DEG 23KT 4084 9084

NICHOLS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 6:48 PM CDTSpecial Weather StatementDVNJohnson42 min
Aug 4, 5:57 PM CDTSpecial Weather StatementDVNBureau48 min

Nearby

Special Weather Statements in Illinois, 2014Every special weather statement in 2014

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.