Alert archive / Illinois / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 9, NWS Quad Cities, IA

March 11, 2006Henry County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Mar 11, 2006, 5:07 PM CST for Henry County, Illinois. It was in force for 53 min. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 11, 2006, 5:07 PM CST (23:07 UTC)
Expired: Mar 11, 2006, 6:00 PM CST
In force: 53 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Henry County, IL

The radar

The Quad Cities radar (KDVN), 50 km from the middle of the area, began a volume at 23:08 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.

What was reported inside it

Time	Report	Where	Remark
Mar 11, 5:12 PM CST	HAIL 1	Woodhull, IL	SPOTTER REPORTED PENNY SIZE HAIL AND QUARTER SIZE HAIL RAPIDLY COVERING THE GROUND.
Mar 11, 5:15 PM CST	HAIL 0.75	Woodhull, IL
Mar 11, 5:21 PM CST	HAIL 1	Woodhull, IL
Mar 11, 5:23 PM CST	HAIL 1	Cambridge, IL	SPOTTER REPORTED PEA TO QUARTER SIZE HAIL.
Mar 11, 5:24 PM CST	HAIL 1.75	Cambridge, IL
Mar 11, 5:42 PM CST	HAIL 0.88	W Geneseo, IL	WEST OF GENESEO ON INTERSTATE 80.
Mar 11, 5:49 PM CST	HAIL 0.75	3 W Atkinson, IL	SPOTTER REPORTED THE GROUND WAS COVERED WITH DIME SIZE HAIL AT MILE MARKER 25 ALONG INTERSTATE 80.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 4 storm reports to this severe thunderstorm warning; the first came 5 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Mar 11, 2:22 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.1 hours before the alert went out and 46 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: 1578 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 436 m²/s²
0-3 km storm-relative helicity: 432 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.

000 
WUUS53 KDVN 112307
SVRDVN
ILC073-120000-
/O.NEW.KDVN.SV.W.0009.060311T2307Z-060312T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
507 PM CST SAT MAR 11 2006

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HENRY COUNTY IN NORTHWEST ILLINOIS
  THIS INCLUDES THE CITIES OF...KEWANEE...CAMBRIDGE

* UNTIL 600 PM CST

* AT 504 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 7 MILES SOUTHEAST OF WOODHULL...OR ABOUT 13 MILES
  NORTHEAST OF GALESBURG...AND MOVING NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GALVA BY 515 PM CST
  7 MILES SOUTHEAST OF CAMBRIDGE BY 520 PM CST
  7 MILES NORTHWEST OF KEWANEE BY 530 PM CST
  ATKINSON BY 535 PM CST
  ANNAWAN BY 540 PM CST

THIS INCLUDES INTERSTATE 80 IN ILLINOIS BETWEEN MILE MARKERS 14 AND
35.

THIS INCLUDES INTERSTATE 74 IN ILLINOIS BETWEEN MILE MARKERS 26 AND
33.

THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.

LAT...LON 4116 9037 4116 8994 4143 8986 4157 9025

$$

MAYES

3 follow-up statements

000 
WWUS53 KDVN 112315
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
514 PM CST SAT MAR 11 2006

ILC073-120000-
/O.CON.KDVN.SV.W.0009.000000T0000Z-060312T0000Z/
HENRY IL-
514 PM CST SAT MAR 11 2006

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CST
FOR HENRY COUNTY...

AT 508 PM CST...TRAINED SPOTTERS REPORTED A SEVERE THUNDERSTORM 
PRODUCING QUARTER SIZE HAIL NEAR WOODHULL.  THIS STORM WAS LOCATED 
NEAR NEKOMA...OR ABOUT 9 MILES SOUTH OF CAMBRIDGE...MOVING NORTHEAST 
AT 55 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  GERMAN CORNER AND 7 MILES NORTHWEST OF KEWANEE BY 520 PM CST
  5 MILES SOUTHEAST OF ATKINSON AND 7 MILES NORTHWEST OF BRANDENBURG
  CORNERS BY 525 PM CST
  ANNAWAN BY 530 PM CST

THIS INCLUDES INTERSTATE 80 IN ILLINOIS BETWEEN MILE MARKERS 12 AND
35.

THIS INCLUDES INTERSTATE 74 IN ILLINOIS BETWEEN MILE MARKERS 19 AND
33.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CST SATURDAY EVENING
FOR SOUTHEASTERN IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST
MISSOURI.

LAT...LON 4116 9042 4116 8989 4143 8986 4157 9026

$$

MAYES

000 
WWUS53 KDVN 112327
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
526 PM CST SAT MAR 11 2006

ILC073-120000-
/O.CON.KDVN.SV.W.0009.000000T0000Z-060312T0000Z/
HENRY IL-
526 PM CST SAT MAR 11 2006

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CST
FOR HENRY COUNTY...

AT 521 PM CST...TRAINED SPOTTERS REPORTED A SEVERE THUNDERSTORM 
PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE IN CAMBRIDGE.  
THIS STORM WAS LOCATED NEAR ULAH...OR ABOUT OVER CAMBRIDGE...MOVING 
NORTHEAST AT 55 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ANNAWAN BY 535 PM CST

THIS INCLUDES INTERSTATE 80 IN ILLINOIS BETWEEN MILE MARKERS 12 AND
35.

THIS INCLUDES INTERSTATE 74 IN ILLINOIS BETWEEN MILE MARKERS 18 AND
33.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CST SATURDAY EVENING
FOR SOUTHEASTERN IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST
MISSOURI.

LAT...LON 4116 9042 4116 8989 4143 8986 4157 9026

$$

MAYES

000 
WWUS53 KDVN 112357
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
557 PM CST SAT MAR 11 2006

ILC073-120007-
/O.EXP.KDVN.SV.W.0009.000000T0000Z-060312T0000Z/
HENRY IL-
557 PM CST SAT MAR 11 2006

...THE SEVERE THUNDERSTORM WARNING FOR HENRY COUNTY EXPIRES AT 600 PM
CST...

THE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING SEVERE WEATHER HAS
MOVED OUT OF THE WARNED AREA. THEREFORE THE SEVERE THUNDERSTORM
WARNING HAS BEEN ALLOWED TO EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CST SATURDAY EVENING
FOR SOUTHEASTERN IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST
MISSOURI.

LAT...LON 4116 9042 4116 8989 4143 8986 4157 9026

$$

MAYES

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 Mar 11, 3:31 PM CST, 1 hour 36 minutes earlier.

Area forecast discussion, Mar 11, 3:31 PM CST, 1 hour 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
330 PM CST SAT MAR 10

Hazardous weather outlook, Mar 11, 12:16 PM CST, 4 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1216 PM CST SAT MAR 11 2006

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-121730-
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-
1216 PM CST SAT MAR 11 2006

...SLIGHT RISK OF SEVERE WEATHER TODAY...

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

FLOW FROM THE GULF OF MEXICO HAS ALLOWED WARM AND MOIST AIR TO
WORK ITS WAY TOWARD THE MID-MISSISSIPPI RIVER VALLEY THIS MORNING.
THE WARM AND MOIST AIR SHOULD AID INSTABILITY THIS AFTERNOON...
ALLOWING THUNDERSTORMS TO DEVELOP IN THE AREA. THE PRIMARY THREAT
FOR SEVERE WEATHER EXISTS SOUTH OF HIGHWAY 92 IN IOWA... IN ALL OF
NORTHEASTERN MISSOURI... AND ALONG AND EAST OF THE MISSISSIPPI
RIVER. ENOUGH WIND SHEAR IS PRESENT TO ALLOW DEVELOPMENT OF
SUPERCELL THUNDERSTORMS THAT WILL EVOLVE INTO A LINE OF STORMS
LATER IN THE EVENING. THE MAIN THREAT FROM THESE THUNDERSTORMS
WILL BE LARGE HAIL... ALTHOUGH DAMAGING WIND GUSTS ARE POSSIBLE AS
THE STORMS EVOLVE INTO A LINE IN THE EVENING. AN ISOLATED TORNADO
CANNOT BE RULED OUT... ALTHOUGH THE GREATER THREAT FOR TORNADOES
EXISTS IN EAST CENTRAL MISSOURI INTO SOUTHERN ILLINOIS. BRIEF HEAVY
RAINS MAY ALSO ACCOMPANY THUNDERSTORMS TODAY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

ON SUNDAY... A MODERATE RISK OF SEVERE WEATHER EXISTS FOR THE AREA
SOUTH OF HIGHWAY 34 AND A SLIGHT RISK FOR SEVERE WEATHER EXISTS
FOR THE REST OF THE AREA. A STORM SYSTEM MOVING THROUGH THE AREA
ON SUNDAY AFTERNOON WILL AGAIN ALLOW SUPERCELL STORMS TO DEVELOP
IN THE AREA. WITH MORE MOISTURE TOMORROW THAN TODAY AS WELL AS
STRONGER WIND SHEAR... THESE STORMS WILL BE CAPABLE OF PRODUCING
LARGE HAIL... DAMAGING WINDS... AND ISOLATED TORNADOES. PLEASE
STAY TUNED TO KEEP ABREAST OF FORECAST UPDATES AS THIS SCENARIO
EVOLVES.

ON WEDNESDAY AND THURSDAY... A DISTURBANCE FROM THE PACIFIC WILL
BRING RAIN AND SNOW TO THE AREA. IT IS TOO EARLY TO ASSESS THE
POTENTIAL FOR RAIN AND SNOW AMOUNTS WITH THIS SYSTEM.

THE LOCALLY HEAVY RAINS POSSIBLE WITH STORMS THIS WEEK MAY CAUSE
LOCAL RIVERS TO EXPERIENCE MODERATE RISES. CURRENT RIVER LEVELS
ARE RUNNING NEAR TO BELOW NORMAL DUE TO THE ONGOING DROUGHT ACROSS
THE REGION.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY THIS AFTERNOON AND EVENING AS WELL AS
TOMORROW. PLEASE REPORT ANY SEVERE WEATHER TO THE NATIONAL WEATHER
SERVICE OFFICE IN THE QUAD CITIES.

MAYES

In the hours before

Local storm report, Mar 11, 4:12 PM CST, 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
412 PM CST SAT MAR 11 2006

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

0405 PM     HAIL             4 W MACOMB              40.48N 90.75W
03/11/2006  E1.00 INCH       MCDONOUGH          IL   TRAINED SPOTTER

&&

DANF

Local storm report, Mar 11, 4:24 PM CST, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
424 PM CST SAT MAR 11 2006

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

0413 PM     HAIL             1 NW MACOMB             40.48N 90.69W
03/11/2006  E0.75 INCH       MCDONOUGH          IL   TRAINED SPOTTER

            3/4 INCH HAIL COMPLETELY COVERING THE GROUND

&&

DANF

Local storm report, Mar 11, 4:32 PM CST, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
432 PM CST SAT MAR 11 2006

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

0427 PM     HAIL             3 S ROSEVILLE           40.69N 90.66W
03/11/2006  E0.75 INCH       WARREN             IL   TRAINED SPOTTER

0427 PM     HAIL             ROSEVILLE               40.73N 90.66W
03/11/2006  E0.50 INCH       WARREN             IL   TRAINED SPOTTER

&&

DANF

Local storm report, Mar 11, 4:35 PM CST, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
435 PM CST SAT MAR 11 2006

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

0425 PM     HAIL             SWAN CREEK              40.67N 90.65W
03/11/2006  E0.75 INCH       WARREN             IL   PUBLIC

&&

MIKEM

Local storm report, Mar 11, 5:02 PM CST, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
502 PM CST SAT MAR 11 2006

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

0458 PM     HAIL             COLCHESTER              40.43N 90.79W
03/11/2006  E0.50 INCH       MCDONOUGH          IL   LAW ENFORCEMENT

&&

DANF

Local storm report, Mar 11, 5:05 PM CST, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
505 PM CST SAT MAR 11 2006

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

0458 PM     HAIL             COLCHESTER              40.43N 90.79W
03/11/2006  E0.88 INCH       MCDONOUGH          IL   TRAINED SPOTTER

0504 PM     HAIL             PRAIRIE CITY            40.62N 90.46W
03/11/2006  E0.75 INCH       MCDONOUGH          IL   TRAINED SPOTTER

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 11, 3:36 PM CST	Severe Thunderstorm Warning	DVN	Hancock, McDonough	54 min
Mar 11, 4:10 PM CST	Severe Thunderstorm Warning	DVN	Warren	65 min
Mar 11, 4:59 PM CST	Severe Thunderstorm Warning	DVN	McDonough	38 min
Mar 11, 5:34 PM CST	Severe Thunderstorm Warning	DVN	Warren	15 min
Mar 11, 5:47 PM CST	Severe Thunderstorm Warning	DVN	Whiteside	39 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2006 Every severe thunderstorm warning in 2006

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.