Alert archive / Iowa / Tornado Warnings in 2009

Tornado Warning 4, NWS Quad Cities, IA

April 26, 2009Delaware County, Linn County, Iowa

NWS Quad Cities, IA issued this tornado warning at Apr 26, 2009, 4:52 PM CDT for Delaware County, Linn County, Iowa. It was in force for 23 min. 9 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
Apr 26, 2009, 4:52 PM CDT (21:52 UTC)
Expired
Apr 26, 2009, 5:15 PM CDT
In force
23 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon

Counties Delaware County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 103 km from the middle of the area, began a volume at 21:53 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

TimeReportWhereRemark
Apr 26, 4:52 PM CDTTORNADO1 Ne Lafayette, IALOCATION...NEAR LAFAYETTE...NORTHEAST TO THE LINN/DELAWARE COUNTY BORDER NORTH OF PRAIRIEBURG. TIME...APPROXIMATELY 452 PM TO 510 PM 4/26/09. INJURIES/FATALITIES...NONE. EF-SCALE RATING...EF1. ESTIMATED WIND SPEED...100 MPH. MAX WIDTH...100 YARDS. PATH LENGTH.
Apr 26, 4:53 PM CDTTORNADO5 W Central City, IA
Apr 26, 4:58 PM CDTTORNADO1 N Alburnett, IABRIEF TOUCHDOWN. WAS ON GROUND FOR ABOUT A MINUTE. TORNADO KNOCKED DOWN SOME POWER LINES.
Apr 26, 4:59 PM CDTTORNADO1 E Coggon, IARYAN FIRE DEPARTMENT REPORTING TORNADO ON THE GROUND EAST OF COGGON.
Apr 26, 5:07 PM CDTHAIL 1Ryan, IA
Apr 26, 5:07 PM CDTHAIL 1.753 W Coggon, IAGOLF BALL SIZED HAIL JUST ENDED ABOUT 3 MILES WEST OF COGGON.
Apr 26, 5:10 PM CDTTORNADO5 Wsw Buck Creek, IACONTINUATION FROM LINN COUNTY. LOCATION...5 MILES WEST SOUTHWEST OF BUCK CREEK ALONG THE DELAWARE/LINN COUNTY BORDER...NORTHEAST TO 1.5 MILES NORTH OF BUCK CREEK. TIME...APPROXIMATELY 510 PM TO 530 PM 4/26/09. INJURIES/FATALITIES...NONE. EF-SCALE RATING...EF1.
Apr 26, 5:15 PM CDTHAIL 0.751 S Delhi, IA
Apr 26, 5:23 PM CDTTORNADO1 Sw Buck Creek, IATORNADO STILL ON GROUND.

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

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.9 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 12:00Z on 2009-04-26Temperature 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 12:00Z on 2009-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 402 square meters per square second.193958Sfc1 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
586 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
402 m²/s²
0-3 km storm-relative helicity
403 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WFUS53 KDVN 262152
TORDVN
IAC055-113-262215-
/O.NEW.KDVN.TO.W.0004.090426T2152Z-090426T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
452 PM CDT SUN APR 26 2009

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN LINN COUNTY IN EAST CENTRAL IOWA...
  SOUTHERN DELAWARE COUNTY IN NORTHEAST IOWA...

* UNTIL 515 PM CDT.

* AT 451 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO NEAR LAFAYETTE...OR 13 MILES NORTH OF CEDAR RAPIDS...MOVING
  NORTHEAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  ALBURNETT AROUND 455 PM CDT...
  PARIS AND CENTRAL CITY AROUND 500 PM CDT...
  COGGON AROUND 505 PM CDT...
  PRAIRIEBURG AROUND 510 PM CDT...
  RYAN...BUCK CREEK...7 MILES SOUTHWEST OF TURTLE CREEK PARK AND 8
  MILES SOUTH OF BAILEYS FORD PARK AROUND 515 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4239 9115 4229 9132 4229 9137 4226 9137
      4211 9162 4217 9174 4230 9160 4249 9141
TIME...MOT...LOC 2152Z 223DEG 35KT 4216 9165

$$

SHEETS
3 follow-up statements
000 
WWUS53 KDVN 262156
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
456 PM CDT SUN APR 26 2009

IAC055-113-262215-
/O.CON.KDVN.TO.W.0004.000000T0000Z-090426T2215Z/
DELAWARE IA-LINN IA-
456 PM CDT SUN APR 26 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
NORTHEASTERN LINN AND SOUTHERN DELAWARE COUNTIES...

AT 454 PM CDT...TRAINED SPOTTERS REPORTED A TORNADO APPROXIMATELY 5 
MILES WEST OF CENTRAL CITY...OR 14 MILES NORTH OF CEDAR 
RAPIDS...MOVING NORTHEAST AT 40 MPH.

THE TORNADO WILL BE NEAR...
  PARIS AND CENTRAL CITY AROUND 500 PM CDT...
  COGGON AROUND 505 PM CDT...
  PRAIRIEBURG AROUND 510 PM CDT...
  RYAN...BUCK CREEK...7 MILES SOUTHWEST OF TURTLE CREEK PARK AND 8
  MILES SOUTH OF BAILEYS FORD PARK AROUND 515 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ABANDON A MOBILE HOME OR VEHICLE IMMEDIATELY FOR A MORE SUBSTANTIAL
SHELTER. IF NO SAFE SHELTER IS AVAILABLE...MOVE TO A DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

LAT...LON 4239 9115 4229 9132 4229 9137 4226 9137
      4214 9160 4220 9167 4230 9160 4248 9140
TIME...MOT...LOC 2155Z 223DEG 35KT 4218 9162

$$
SHEETS
000 
WWUS53 KDVN 262207
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
507 PM CDT SUN APR 26 2009

IAC055-113-262215-
/O.CON.KDVN.TO.W.0004.000000T0000Z-090426T2215Z/
DELAWARE IA-LINN IA-
507 PM CDT SUN APR 26 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
NORTHEASTERN LINN AND SOUTHERN DELAWARE COUNTIES...

AT 505 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED ABOUT 1 MILE EAST OF 
PARIS...MOVING NORTHEAST AT 30 MPH.

THE TORNADO WILL BE NEAR...
  RYAN AND 8 MILES SOUTHWEST OF BUCK CREEK AROUND 515 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

ABANDON A MOBILE HOME OR VEHICLE IMMEDIATELY FOR A MORE SUBSTANTIAL
SHELTER. IF NO SAFE SHELTER IS AVAILABLE...MOVE TO A DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT MONDAY MORNING
FOR EASTERN IOWA AND NORTHWEST ILLINOIS.

&&

LAT...LON 4239 9115 4229 9131 4229 9137 4225 9142
      4220 9153 4228 9160 4230 9160 4248 9140
TIME...MOT...LOC 2206Z 230DEG 24KT 4223 9155

$$
000 
WWUS53 KDVN 262215
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
515 PM CDT SUN APR 26 2009

IAC055-113-262223-
/O.EXP.KDVN.TO.W.0004.000000T0000Z-090426T2215Z/
DELAWARE IA-LINN IA-
515 PM CDT SUN APR 26 2009

...THE TORNADO WARNING FOR NORTHEASTERN LINN AND SOUTHERN DELAWARE
COUNTIES WILL EXPIRE AT 515 PM CDT...

AT 513 PM CDT...DOPPLAR RADAR CONTINUED TO INDICATE A TORNADO NEAR 
COGON. THIS TORNADO WARNING HAS BEEN REPLACED BY A NEW TORNADO 
WARNING THAT EXTENDS INTO PORTIONS OF DELAWARE...AND DUBUQUE 
COUNTIES THROUGH 600 PM CDT.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT MONDAY MORNING
FOR EASTERN IOWA AND NORTHWEST ILLINOIS.

LAT...LON 4239 9115 4229 9131 4229 9137 4225 9142
      4220 9153 4228 9160 4230 9160 4248 9140
TIME...MOT...LOC 2213Z 230DEG 24KT 4226 9150

$$

SHEETS

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 25, 8:25 PM CDTSpecial Weather StatementDVNHenry, Jefferson, Washington50 min
Apr 25, 9:32 PM CDTSpecial Weather StatementDVNBenton, Buchanan, Delaware, Dubuque, Jackson, Jones and 1 more58 min
Apr 25, 9:45 PM CDTSpecial Weather StatementDVNCedar, Clinton, Des Moines, Henry, Lee, Louisa and 2 more90 min
Apr 26, 2:20 AM CDTSpecial Weather StatementDVNBenton, Buchanan, Cedar, Delaware, Dubuque, Iowa and 4 more3 hr
Apr 26, 3:04 AM CDTFlash Flood WatchDVNBenton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 8 more24 hr
Apr 26, 4:32 AM CDTSpecial Weather StatementDVNClinton, Scott118 min
Apr 26, 4:34 AM CDTSpecial Weather StatementDVNClinton, Scott116 min
Apr 26, 9:49 AM CDTRiver Flood WarningDVNJones, Linn5 days
Apr 26, 9:49 AM CDTRiver Flood WarningDVNClinton, Scott10 days
Apr 26, 9:56 AM CDTRiver Flood WarningDVNKeokuk6 days
Apr 26, 10:01 AM CDTRiver Flood WarningDVNLee35 hr
Apr 26, 10:52 AM CDTRiver Flood WarningDVNIowa, Johnson12 days
Apr 26, 4:14 PM CDTSpecial Weather StatementDVNBenton, Buchanan, Cedar, Delaware, Johnson, Jones and 1 more61 min
Apr 26, 4:41 PM CDTSevere Thunderstorm WarningDVNBuchanan, Delaware, Linn23 min
Apr 26, 5:12 PM CDTTornado WarningDVNDelaware, Dubuque, Jones, Linn48 min
Apr 26, 5:48 PM CDTTornado WarningDVNDelaware, Dubuque42 min
Apr 26, 6:27 PM CDTTornado WarningDVNDubuque18 min
Apr 26, 6:30 PM CDTFlash Flood WarningDVNDelaware5 hr

Nearby

Tornado Warnings in Iowa, 2009Every tornado warning in 2009Tornadoes in 2009

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.