Alert archive / Illinois / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 25, NWS Quad Cities, IA

April 6, 2010Stephenson County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 6, 2010, 6:01 AM CDT for Stephenson County, Illinois. It was in force for 14 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
Apr 6, 2010, 6:01 AM CDT (11:01 UTC)
Expired
Apr 6, 2010, 6:15 AM CDT
In force
14 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

County Stephenson County, IL

The radar

The Quad Cities radar (KDVN), 112 km from the middle of the area, began a volume at 11:02 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 6, 4:44 AM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 11.0 hours before the alert went out and 107 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 00:00Z on 2010-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2010-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 323 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1762 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
323 m²/s²
0-3 km storm-relative helicity
584 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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 Apr 6, 4:06 AM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Apr 6, 4:06 AM CDT, 1 hour 55 minutes before
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Hazardous weather outlook, Apr 6, 5:16 AM CDT, 45 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
516 AM CDT TUE APR 6 2010

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-071030-
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-
516 AM CDT TUE APR 6 2010

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

THUNDERSTORMS MAINLY ALONG AND NORTH OF INTERSTATE 80 THIS
MORNING WILL BRING THE POTENTIAL FOR ISOLATED LARGE HAIL.
IN ADDITION... SOME AREAS MAY SEE SEVERAL ROUNDS OF STORMS
RESULTING IN LOCALLY HEAVY RAINFALL OF 1 TO 2 INCHES... AND
THE THREAT FOR FLASH FLOODING.

THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER PORTIONS OF CENTRAL
AND SOUTHERN IOWA MID AFTERNOON IN ADVANCE OF A COLD FRONT. THE
STORMS WILL MOVE EASTWARD ACROSS THE OUTLOOK AREA LATE THIS
AFTERNOON AND TONIGHT BRINGING A THREAT FOR LARGE HAIL AND
DAMAGING WINDS. THERE IS ALSO THE POTENTIAL FOR ISOLATED TORNADOES
WEST OF THE MISSISSIPPI RIVER AND SOUTH OF HIGHWAY 30 BETWEEN 4 PM
AND 9 PM. THE STORM PREDICTION CENTER HAS PLACED THE ENTIRE
OUTLOOK AREA IN A SLIGHT RISK FOR SEVERE WEATHER THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED THROUGH TONIGHT.

In the hours before

Local storm report, Apr 6, 5:20 AM CDT, 41 minutes before
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Local storm report, Apr 6, 5:31 AM CDT, 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
531 AM CDT TUE APR 06 2010

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

0526 AM     HAIL             6 NE DAVENPORT          41.62N 90.52W
04/06/2010  E0.50 INCH       SCOTT              IA   TRAINED SPOTTER

            NE DAVENPORT NEAR 53RD AND UTICA RIDGE. PEA TO MARBLE
            SIZE HAIL.

&&

DLS
Local storm report, Apr 6, 5:36 AM CDT, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
536 AM CDT TUE APR 06 2010

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

0536 AM     HAIL             LE CLAIRE               41.60N 90.36W
04/06/2010  M1.00 INCH       SCOTT              IA   TRAINED SPOTTER

&&

DLS
Local storm report, Apr 6, 5:39 AM CDT, 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
539 AM CDT TUE APR 06 2010

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

0530 AM     HAIL             N LE CLAIRE             41.60N 90.36W
04/06/2010  M1.00 INCH       SCOTT              IA   TRAINED SPOTTER

&&

DLS
Local storm report, Apr 6, 5:47 AM CDT, 14 minutes before
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Local storm report, Apr 6, 5:50 AM CDT, 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 5, 10:14 PM CDTSpecial Weather StatementDVNBenton, Delaware, Dubuque, Jackson, Jones, Linn61 min
Apr 5, 10:27 PM CDTSevere Thunderstorm WarningDVNDelaware, Dubuque, Jackson, Jones, Linn48 min
Apr 5, 10:58 PM CDTSevere Thunderstorm WarningDVNDubuque, Jackson62 min
Apr 5, 11:13 PM CDTSevere Thunderstorm WarningDVNClinton, Jackson47 min
Apr 6, 3:09 AM CDTSpecial Weather StatementDVNBenton51 min
Apr 6, 4:15 AM CDTSevere Thunderstorm WarningDVNCedar, Johnson, Muscatine30 min
Apr 6, 5:05 AM CDTSpecial Weather StatementDVNScott55 min
Apr 6, 5:17 AM CDTSevere Thunderstorm WarningDVNClinton, Scott28 min
Apr 6, 6:24 AM CDTSpecial Weather StatementDVNJackson, Jones51 min
Apr 6, 12:37 PM CDTRiver Flood WarningDVNMuscatine, Scott22 hr
Apr 6, 12:37 PM CDTRiver Flood WarningDVNLouisa, Muscatine22 hr
Apr 6, 12:37 PM CDTRiver Flood WarningDVNLouisa, Muscatine47 hr
Apr 6, 12:42 PM CDTRiver Flood WarningDVNClinton, Scott7 days
Apr 6, 12:42 PM CDTRiver Flood WarningDVNIowa, Johnson5 days
Apr 6, 12:42 PM CDTRiver Flood WarningDVNLouisa4 days
Apr 6, 12:42 PM CDTRiver Flood WarningDVNLee22 hr
Apr 6, 4:22 PM CDTSevere Thunderstorm WarningDVNBuchanan53 min
Apr 6, 5:15 PM CDTSevere Thunderstorm WarningDVNBuchanan60 min
Apr 6, 6:07 PM CDTSevere Thunderstorm WarningDVNBuchanan, Delaware, Dubuque34 min
Apr 6, 6:18 PM CDTSevere Thunderstorm WarningDVNBenton, Buchanan, Linn57 min
Apr 6, 6:54 PM CDTSpecial Weather StatementDVNBuchanan51 min
Apr 6, 6:59 PM CDTTornado WarningDVNBenton, Buchanan, Delaware, Linn43 min
Apr 5, 8:42 PM CDTSevere Thunderstorm WarningDVNCarroll19 min
Apr 5, 11:36 PM CDTSevere Thunderstorm WarningDVNStephenson39 min
Apr 5, 11:58 PM CDTSevere Thunderstorm WarningDVNCarroll24 min
Apr 6, 5:44 AM CDTSevere Thunderstorm WarningDVNCarroll, Whiteside31 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2010Every severe thunderstorm warning in 2010

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.