Alert archive / Iowa / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 23, NWS Quad Cities, IA

April 6, 2010Clinton County, Scott County, Iowa; Rock Island County, Whiteside County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 6, 2010, 5:17 AM CDT for Clinton County, Scott County, Iowa; Rock Island County, Whiteside County, Illinois. 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 counties it named.

The facts

Issued: Apr 6, 2010, 5:17 AM CDT (10:17 UTC)
Expired: Apr 6, 2010, 5:45 AM CDT
In force: 28 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 58.0 mph

Counties Clinton County, IA, Scott County, IA, Rock Island County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 17 km from the middle of the area, began a volume at 10:21 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.

Issued	Product	Office	Lasted
Apr 6, 4:44 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 10.3 hours before the alert went out and 11 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: 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 11 minutes earlier.

Area forecast discussion, Apr 6, 4:06 AM CDT, 1 hour 11 minutes before

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Hazardous weather outlook, Apr 6, 5:16 AM CDT, 1 minute 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, 2:05 AM CDT, 3 hours 12 minutes before

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Special weather statement, Apr 6, 3:09 AM CDT, 2 hours 8 minutes before

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Special weather statement, Apr 6, 3:50 AM CDT, 1 hour 27 minutes before

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Local storm report, Apr 6, 4:17 AM CDT, 1 hour before

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Special weather statement, Apr 6, 5:05 AM CDT, 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
505 AM CDT TUE APR 6 2010

IAZ065>068-ILZ009-015>017-061100-
BUREAU-CEDAR-CLINTON-HENRY-MUSCATINE-ROCK ISLAND-SCOTT-WHITESIDE-
505 AM CDT TUE APR 6 2010

...FAST MOVING STRONG THUNDERSTORMS MOVING INTO THE QUAD CITIES...

AT 501 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR DURANT...OR 14 MILES WEST OF DAVENPORT...
MOVING EAST AT 55 MPH.

* THE THUNDERSTORM WILL BE NEAR...
  DONAHUE AROUND 510 AM CDT...
  ELDRIDGE...DAVENPORT AND LONG GROVE AROUND 515 AM CDT...
  BETTENDORF AND HAMPTON AROUND 525 AM CDT...
  PORT BYRON...LE CLAIRE...RAPIDS CITY AND PRINCETON AROUND 530 AM
  CDT...

PENNY SIZE HAIL...FREQUENT CLOUD TO GROUND LIGHTNING...BRIEF HEAVY
RAIN...ARE EXPECTED WITH THIS STORM. MOVE INDOORS AND STAY AWAY FROM
WINDOWS UNTIL STORMS PASS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 AM CDT
TUESDAY MORNING FOR NORTHEASTERN IOWA AND NORTHWESTERN ILLINOIS.

LAT...LON 4149 8958 4153 9094 4177 9088 4176 8963
      4175 8963 4159 8963 4159 8958
TIME...MOT...LOC 1004Z 269DEG 47KT 4162 9080

SHEETS

Local storm report, Apr 6, 5:10 AM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
510 AM CDT TUE APR 06 2010

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

0505 AM     HAIL             DEWITT                  41.82N 90.55W
04/06/2010  E0.50 INCH       CLINTON            IA   LAW ENFORCEMENT

&&

LEGRO

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 10:14 PM CDT	Special Weather Statement	DVN	Benton, Delaware, Dubuque, Jackson, Jones, Linn	61 min
Apr 5, 10:27 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jackson, Jones, Linn	48 min
Apr 5, 10:58 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque, Jackson	62 min
Apr 5, 11:13 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson	47 min
Apr 6, 3:09 AM CDT	Special Weather Statement	DVN	Benton	51 min
Apr 6, 4:15 AM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Muscatine	30 min
Apr 6, 5:05 AM CDT	Special Weather Statement	DVN	Scott	55 min
Apr 6, 6:24 AM CDT	Special Weather Statement	DVN	Jackson, Jones	51 min
Apr 6, 12:37 PM CDT	River Flood Warning	DVN	Muscatine, Scott	22 hr
Apr 6, 12:37 PM CDT	River Flood Warning	DVN	Louisa, Muscatine	22 hr
Apr 6, 12:37 PM CDT	River Flood Warning	DVN	Louisa, Muscatine	47 hr
Apr 6, 12:42 PM CDT	River Flood Warning	DVN	Clinton, Scott	7 days
Apr 6, 12:42 PM CDT	River Flood Warning	DVN	Iowa, Johnson	5 days
Apr 6, 12:42 PM CDT	River Flood Warning	DVN	Louisa	4 days
Apr 6, 12:42 PM CDT	River Flood Warning	DVN	Lee	22 hr
Apr 6, 4:22 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	53 min
Apr 6, 5:15 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	60 min
Apr 6, 6:07 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware, Dubuque	34 min
Apr 6, 6:18 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Linn	57 min
Apr 6, 6:54 PM CDT	Special Weather Statement	DVN	Buchanan	51 min
Apr 6, 6:59 PM CDT	Tornado Warning	DVN	Benton, Buchanan, Delaware, Linn	43 min
Apr 5, 8:42 PM CDT	Severe Thunderstorm Warning	DVN	Carroll	19 min
Apr 5, 11:36 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	39 min
Apr 5, 11:58 PM CDT	Severe Thunderstorm Warning	DVN	Carroll	24 min
Apr 6, 5:44 AM CDT	Severe Thunderstorm Warning	DVN	Carroll, Whiteside	31 min
Apr 6, 6:01 AM CDT	Severe Thunderstorm Warning	DVN	Stephenson	14 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2010 Severe Thunderstorm Warnings in Illinois, 2010 Every 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.