Alert archive / Illinois / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 127, NWS Quad Cities, IA

August 25, 2014Clinton County, Iowa; Carroll County, Whiteside County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 25, 2014, 1:25 PM CDT for Clinton County, Iowa; Carroll County, Whiteside County, Illinois. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 25, 2014, 1:25 PM CDT (18:25 UTC)
Expired: Aug 25, 2014, 2:15 PM CDT
In force: 50 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clinton County, IA, Carroll County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 50 km from the middle of the area, began a volume at 18:25 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, 6.4 hours before the alert went out and 45 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: 2467 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 1453 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 25, 1:08 PM CDT, 17 minutes earlier.

Area forecast discussion, Aug 25, 1:08 PM CDT, 17 minutes before

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Hazardous weather outlook, Aug 25, 1:10 PM CDT, 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
110 PM CDT MON AUG 25 2014

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-260915-
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-
110 PM CDT MON AUG 25 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...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS WILL BE FOUND THIS AFTERNOON OVER PORTIONS
OF NORTHEAST AND EAST CENTRAL IOWA...AND NORTHWEST ILLINOIS.
THE STRONGEST STORMS WILL BE CAPABLE OF PRODUCING STRONG WINDS
OF 35 TO 50 MPH... ALTHOUGH AN ISOLATED SEVERE STORM WITH WINDS TO
AROUND 60 MPH WILL BE POSSIBLE. HIGH MOISTURE LEVELS MAY ALSO LEAD
TO LOCALLY HEAVY RAINFALL.

ADDITIONAL STORMS ARE ANTICIPATED OVER PORTIONS OF THE OUTLOOK
AREA TONIGHT MAINLY NORTH OF INTERSTATE 80. LOCALLY HEAVY RAINFALL
WILL BE THE PRIMARY THREAT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE IS A DAILY CHANCE OF THUNDERSTORMS FROM TUESDAY THROUGH
SUNDAY. LOCALLY HEAVY RAINFALL WILL BE POSSIBLE DUE TO HIGH
MOISTURE LEVELS IN THE ATMOSPHERE. HOWEVER...THE THREAT OF SEVERE
WEATHER APPEARS LOW AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE THIS AFTERNOON OVER PORTIONS OF
NORTHEAST AND EAST CENTRAL IOWA...AND NORTHWEST ILLINOIS.

In the hours before

Special weather statement, Aug 25, 12:38 PM CDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1238 PM CDT MON AUG 25 2014

IAZ042-052>054-064>066-ILZ001-007-251900-
LINN IA-JOHNSON IA-JACKSON IA-DUBUQUE IA-CEDAR IA-CLINTON IA-JONES IA-
JO DAVIESS IL-CARROLL IL-
1238 PM CDT MON AUG 25 2014

...THUNDERSTORMS...SOME STRONG ARE POSSIBLE...

*  WEATHER IMPACTS...WIND GUSTS OF 35 TO LOCALLY UP TO 50 MPH.
   BRIEF TORRENTIALLY HEAVY RAINS AND POSIBLY PEA SIZED HAIL.

*  DURATION...THROUGH 2 PM CDT.

STRONG GUSTY WINDS WILL MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES.

EXPECT PONDING OF WATER ON ROADS AND IN LOW-LYING AREAS...AND RISES
IN AREA STREAMS AND CREEKS.

&&

NICHOLS
LAT...LON 4243 9048 4209 9006 4169 9159 4186 9179

NICHOLS

Special weather statement, Aug 25, 1:08 PM CDT, 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
108 PM CDT MON AUG 25 2014

IAZ054-ILZ001-002-007-251915-
JACKSON IA-JO DAVIESS IL-STEPHENSON IL-CARROLL IL-
108 PM CDT MON AUG 25 2014

...THUNDERSTORMS...SOME WITH STRONG WINDS ARE POSSIBLE...

*  WEATHER IMPACTS...WIND GUSTS OF 35 TO LOCALLY UP TO 50 MPH.
   BRIEF TORRENTIALLY HEAVY RAINS AND POSIBLY PEA SIZED HAIL.

*  DURATION...THROUGH 215 PM CDT.

STRONG GUSTY WINDS WILL MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES.

EXPECT PONDING OF WATER ON ROADS AND IN LOW-LYING AREAS...AND RISES
IN AREA STREAMS AND CREEKS.

&&

LAT...LON 4250 8941 4220 8939 4220 8968 4204 8968
      4204 9031 4229 9041 4251 9005

NICHOLS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 7:19 AM CDT	Special Weather Statement	DVN	Jones	56 min
Aug 25, 12:38 PM CDT	Special Weather Statement	DVN	Jackson, Jones	82 min
Aug 25, 1:08 PM CDT	Special Weather Statement	DVN	Carroll, Jo Daviess, Stephenson	67 min
Aug 25, 2:14 PM CDT	Severe Thunderstorm Warning	DVN	Whiteside	46 min
Aug 25, 2:57 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry, Rock Island, Whiteside	63 min
Aug 25, 3:43 PM CDT	Special Weather Statement	DVN	Bureau, Putnam	92 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2014 Severe Thunderstorm Warnings in Iowa, 2014 Every severe thunderstorm warning 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.