Alert archive / Iowa / Tornado Warnings in 2006

Tornado Warning 30, NWS Quad Cities, IA

June 6, 2006Linn County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jun 6, 2006, 2:46 PM CDT for Linn County, Iowa. It was in force for 44 min. 1 report 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: Jun 6, 2006, 2:46 PM CDT (19:46 UTC)
Expired: Jun 6, 2006, 3:30 PM CDT
In force: 44 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Linn County, IA

The radar

The Quad Cities radar (KDVN), 92 km from the middle of the area, began a volume at 19:49 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
Jun 6, 2:59 PM CDT	HAIL 0.88	8 Ese Cedar Rapids, IA	NEAR PALISADES KEPPLER STATE PARK

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

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.8 hours before the alert went out and 98 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: 1 J/kg
Mixed-layer CIN: -307 J/kg
Mixed-layer LCL: 1172 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 104 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 
WFUS53 KDVN 061947
TORDVN
IAC113-062030-
/O.NEW.KDVN.TO.W.0030.060606T1946Z-060606T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
246 PM CDT TUE JUN 6 2006

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  LINN COUNTY IN EAST CENTRAL IOWA...

* UNTIL 330 PM CDT.

* AT 244 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  TORNADO OVER EASTERN AND SOUTHEASTERN CEDAR RAPIDS...MOVING        
  SOUTHEAST AT 30 MPH.

* THE TORNADO WILL BE NEAR...
  MOUNT VERNON AND LISBON BY 305 PM CDT...

THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM
OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING.

THIS STORM IS ALSO CAPABLE OF PRODUCING LARGE HAIL THE SIZE OF 
QUARTERS.
LAT...LON 4205 9166 4195 9141 4196 9138 4186 9138
      4186 9171 4188 9174 4188 9176 4191 9177

$$

12/BARDOU

2 follow-up statements

000 
WWUS53 KDVN 062007
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
305 PM CDT TUE JUN 6 2006

IAC113-062030-
/O.CON.KDVN.TO.W.0030.000000T0000Z-060606T2030Z/
LINN IA-
305 PM CDT TUE JUN 6 2006

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM CDT FOR LINN
COUNTY...

AT 301 PM CDT...RADAR INDICATED A POSSIBLE TORNADO LOCATED JUST 
NORTHWEST OF ELY...OR ABOUT 7 MILES SOUTHEAST OF CEDAR 
RAPIDS...MOVING SOUTHEAST AT 20 MPH.

THE TORNADO WILL BE NEAR...
  PALISADES-KEPLER SP BY 310 PM CDT...
  7 MILES SOUTHWEST OF MOUNT VERNON BY 320 PM CDT...
  8 MILES SOUTHWEST OF LISBON BY 325 PM CDT...

THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM
OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING.

THIS STORM IS ALSO CAPABLE OF PRODUCING LARGE HAIL TO THE SIZE OF 
GOLF BALLS.

LAT...LON 4205 9166 4195 9141 4196 9138 4186 9138
      4186 9171 4188 9174 4188 9176 4191 9177

$$

12/BARDOU

000 
WWUS53 KDVN 062030
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
330 PM CDT TUE JUN 6 2006

IAC113-062040-
/O.EXP.KDVN.TO.W.0030.000000T0000Z-060606T2030Z/
LINN IA-
330 PM CDT TUE JUN 6 2006

...THE TORNADO WARNING FOR LINN COUNTY EXPIRES AT 330 PM CDT...

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

LAT...LON 4205 9166 4195 9141 4196 9138 4186 9138
      4186 9171 4188 9174 4188 9176 4191 9177

$$

12/BARDOU

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Jun 6, 1:52 PM CDT, 54 minutes earlier.

Area forecast discussion, Jun 6, 1:52 PM CDT, 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
150 PM CDT TUE JUNE 06 2006

.SYNOPSIS...
THE LOCAL AREA REMAINS IN THE MOIST WARM AIR AHEAD OF A COLD FRONT
TODAY...WHICH HAS BEEN MOISTENED FURTHER BY A DISSIPATING MCS
EARLIER THIS MORNING. ISOLATED STORMS CONTINUE TO FIRE ALONG THE
OUTFLOW OF THIS MCS AND OVER TOP OF THE COLD POOL IN EASTERN IOWA.
CONVECTION HAS INITIATED ALONG THE FRONT FROM NORTHEAST IOWA TO
SOUTH CENTRAL IOWA...AND THIS IS MOST LIKELY GOING TO BE THE MAIN
SHOW FOR THIS AFTERNOON AND TONIGHT.
&&

.SHORT TERM...TONIGHT THROUGH THURSDAY...
THE FRONT IS EXPECTED TO BE NEAR THE MISSISSIPPI RIVER BY 6 TO 7 PM
THIS EVENING...SO THOUGH WE EXPECT WIDESPREAD STORMS ALONG THE
FRONT...THE EVENT SHOULD BE OVER WITH WEST OF A LINE FROM DUBUQUE TO
FAIRFIELD BY THEN.  BEHIND THE FRONT...WE EXPECT PARTLY TO MOSTLY
CLEAR SKIES AND NORTHWEST WINDS.

WEDNESDAY THROUGH THURSDAY WILL SEE DRIER AIR IN PLACE...WITH UPPER
RIDGING TAKING PLACE.  BY THURSDAY NIGHT...WE SHOULD SEE THE FIRST
IN A LONG SERIES OF ENERGY OVER TOPPING THE WESTERN RIDGE.

.LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...
THE TREND DURING THIS ENTIRE PERIOD WILL BE WARM AND HUMID...WITH
PERIODIC THUNDERSTORM CLUSTERS LEADING TO THE POTENTIAL FOR HEAVY
RAINFALL AND SEVERE WEATHER. THE UPPER RIDGE IS EXPECTED TO SLOWLY
FLATTEN...AND GRADUALLY BE REPLACED BY A WEAK TROF.  THIS WILL KEEP
THE MIDWEST ZONAL...BUT WITH ENERGY IN THE UPPER LEVELS MOVING
ACROSS AN EAST TO WEST FRONT NEAR IOWA...STORMS MAY REGENERATE IN
CONSECUTIVE DAYS.  THE SEASONAL REGIME IS ONE KNOWN FOR SIGNIFICANT
RAINFALL AND SEVERE STORMS...HOWEVER THE DETAILS OF ANY INDIVIDUAL
EVENT ARE UNCLEAR. ..ERVIN..
&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...NONE.
IL...NONE.
MO...NONE.

&&

ERVIN

Hazardous weather outlook, Jun 6, 5:01 AM CDT, 9 hours 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
501 AM CDT TUE JUN 6 2006

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-071015-
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-
501 AM CDT TUE JUN 6 2006

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

SEVERAL CLUSTERS OF THUNDERSTORMS WILL AFFECT MUCH OF EASTERN IOWA
AND NORTHWEST ILLINOIS EARLY THIS MORNING. THUNDERSTORMS WILL BE
CONFINED MAINLY TO AREAS NORTH OF HIGHWAY 34. SOME STORMS MAY BE
CAPABLE OF PRODUCING SMALL HAIL AND HEAVY DOWNPOURS...ESPECIALLY
NORTH OF INTERSTATE 80 BEFORE SUNRISE WITH THE ACTIVITY EXPECTED
TO DISSIPATE BY 9 AM.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE ENTIRE
AREA THIS AFTERNOON. THUNDERSTORMS ARE EXPECTED TO DEVELOP BY MID
AFTERNOON OVER EASTERN IOWA...THEN EXPAND EAST AND SOUTH ACROSS
NORTHEAST MISSOURI AND NORTHWEST ILLINOIS INTO EARLY EVENING AS A
WEAK COLD FRONT PUSHES THROUGH. SOME STORMS MAY BECOME SEVERE...WITH
THE POTENTIAL TO PRODUCE DAMAGING STRAIGHT LINE WINDS OVER 60 MPH
AND HAIL UP TO THE SIZE OF QUARTERS. AN ISOLATED TORNADO IS
POSSIBLE... ESPECIALLY IF STORMS DEVELOP ALONG WEAK BOUNDARIES
THAT MAY LINGER FROM MORNING THUNDERSTORMS. THE POTENTIAL FOR
SEVERE WEATHER WILL END OVER THE AREA BY SUNSET.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THUNDERSTORMS ARE POSSIBLE EACH DAY FROM FRIDAY THROUGH MONDAY.
IT IS TOO EARLY TO DETERMINE THE POTENTIAL FOR SEVERE WEATHER.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.

SHEETS

In the hours before

Local storm report, Jun 6, 2:28 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
228 PM CDT TUE JUN 06 2006

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

0207 PM     HAIL             TODDVILLE               42.10N 91.72W
06/06/2006  E0.75 INCH       LINN               IA   TRAINED SPOTTER

0210 PM     HAIL             ALEXIS                  41.06N 90.57W
06/06/2006  E0.25 INCH       WARREN             IL   LAW ENFORCEMENT

0215 PM     HAIL             4 E HIAWATHA            42.05N 91.61W
06/06/2006  E0.88 INCH       LINN               IA   TRAINED SPOTTER

&&

15

Local storm report, Jun 6, 2:41 PM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
241 PM CDT TUE JUN 06 2006

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

0230 PM     HAIL             1 NW CEDAR RAPIDS       41.98N 91.68W
06/06/2006  M1.00 INCH       LINN               IA   TRAINED SPOTTER

            5 MINUTE DURATION

0233 PM     HAIL             5 NNE CEDAR RAPIDS      42.04N 91.63W
06/06/2006  E0.75 INCH       LINN               IA   TRAINED SPOTTER

&&

15

Local storm report, Jun 6, 2:44 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
244 PM CDT TUE JUN 06 2006

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

0235 PM     HAIL             4 E HIAWATHA            42.05N 91.61W
06/06/2006  E0.75 INCH       LINN               IA   TRAINED SPOTTER

            ESTIMATED 1/2 TO 1 INCH OF RAIN IN PAST 30 MINUTES.

&&

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 6, 1:59 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Lee	25 min
Jun 6, 2:03 PM CDT	Severe Thunderstorm Warning	DVN	Linn	57 min
Jun 6, 2:57 PM CDT	Tornado Warning	DVN	Cedar, Johnson	63 min
Jun 6, 3:50 PM CDT	Severe Thunderstorm Warning	DVN	Washington	59 min
Jun 6, 3:53 PM CDT	Tornado Warning	DVN	Keokuk, Washington	52 min
Jun 6, 4:02 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	43 min
Jun 6, 4:24 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson	66 min
Jun 6, 4:24 PM CDT	Severe Thunderstorm Warning	DVN	Louisa	48 min
Jun 6, 5:32 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque, Jackson	40 min

Nearby

Tornado Warnings in Iowa, 2006 Every tornado warning in 2006 Tornadoes 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.