Alert archive / Iowa / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 73, NWS Quad Cities, IA

April 13, 2006Buchanan County, Delaware County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 13, 2006, 7:28 PM CDT for Buchanan County, Delaware County, Iowa. It was in force for 62 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: Apr 13, 2006, 7:28 PM CDT (00:28 UTC)
Expired: Apr 13, 2006, 8:30 PM CDT
In force: 62 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

Counties Buchanan County, IA, Delaware County, IA

The radar

The Quad Cities radar (KDVN), 137 km from the middle of the area, began a volume at 00:29 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
Apr 13, 7:35 PM CDT	HAIL 1	Independence, IA	BUCHANAN COUNTY REPORTED ANYTHING FROM PEA TO QUARTER SIZE HAIL ACROSS THE COUNTY.

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 2 storm reports to this severe thunderstorm warning; the first came 7 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
Apr 13, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.5 hours before the alert went out and 141 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: 774 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 2028 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 250 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDVN 140028
SVRDVN
IAC019-055-140130-
/O.NEW.KDVN.SV.W.0073.060414T0028Z-060414T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
728 PM CDT THU APR 13 2006

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BUCHANAN COUNTY IN NORTHEAST IOWA...
  DELAWARE COUNTY IN NORTHEAST IOWA...

* UNTIL 830 PM CDT.

* AT 725 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 7
  MILES WEST OF INDEPENDENCE...AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  INDEPENDENCE BY 735 PM CDT...
  ROWLEY BY 740 PM CDT...
  QUASQUETON AND WINTHROP BY 750 PM CDT...
  MASONVILLE BY 805 PM CDT...
  MANCHESTER AND RYAN BY 820 PM CDT...
  DELHI AND DELAWARE BY 830 PM CDT...

THIS INCLUDES INTERSTATE 380 BETWEEN MILE MARKERS 52 AND 53.

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

LAT...LON 4253 9207 4232 9204 4231 9119 4264 9125
      4262 9185

$$

BARDOU/MCCLURE

1 follow-up statement

000 
WWUS53 KDVN 140046
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
747 PM CDT THU APR 13 2006

IAC019-055-140130-
/O.CON.KDVN.SV.W.0073.000000T0000Z-060414T0130Z/
DELAWARE IA-BUCHANAN IA-
747 PM CDT THU APR 13 2006

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR BUCHANAN AND DELAWARE COUNTIES...

AT 742 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS
LOCATED NEAR INDEPENDENCE...OR ABOUT OVER INDEPENDENCE...MOVING EAST
AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  WINTHROP AND BUFFALO CREEK COUNTY PARK BY 755 PM CDT...
  WINTHROP GOLF COURSE BY 800 PM CDT...
  MASONVILLE BY 810 PM CDT...
  COFFINS GROVE PARK BY 815 PM CDT...
  MANCHESTER AIRPORT BY 820 PM CDT...
  MANCHESTER BY 825 PM CDT...

THIS STORM HAS ALREADY PRODUCED WIND DAMAGE AND/OR LARGE HAIL...AND
IT REMAINS A THREAT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FRIDAY MORNING FOR EASTERN IOWA AND NORTHWEST ILLINOIS.

LAT...LON 4253 9207 4232 9204 4231 9119 4264 9125
      4262 9185

$$

BARDOU/MCCLURE

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 13, 5:42 PM CDT, 1 hour 46 minutes earlier.

Area forecast discussion, Apr 13, 5:42 PM CDT, 1 hour 46 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
542 PM CDT THU APR 13 2006

.UPDATE...
THUNDERSTORMS HAVE INITIATED OVER CENTRAL IOWA IN THE LAST 30
MINUTES...AND THIS IS A FAVORABLE LOCATION FOR STRONG TO SEVERE
THUNDERSTORMS TO MOVE INTO OUR CWA.  A SEVERE THUNDERSTORM WATCH AS
BEEN ISSUED TIL MIDNIGHT...AREAS NORTH OF HIGHWAY 78 IN IOWA...AND
FOR MERCER AND ROCK ISLAND IN ILLINOIS. THE MAIN THREAT SHOULD BE
LARGE HAIL AND VERY STRONG WINDS UP TO 80 MPH. SOME SUPERCELLS WILL
BE POSSIBLE AS WELL...MAINLY IN EASTERN IOWA EARLY THIS EVENING.
ERVIN

&&

.SYNOPSIS...
A COLD FRONT WILL SLOWLY SAG SOUTH TONIGHT AND STALL ACROSS THE
REGION FOR THE NEXT THREE DAYS. A SERIES OF LOW PRESSURE SYSTEMS ARE
FORECAST TO TRACK ALONG THE FRONT BRINGING SEVERAL ROUNDS OF RAIN TO
THE AREA.

&&

.DISCUSSION...
MOISTURE IS SLOWLY MOVING INTO THE REGION ALBEIT SLOWER THAN WHAT
THE MODELS HAVE BEEN INDICATING. NEW 18Z SOUNDING STILL HAS A
MINIMAL CAP ON IT. THIS CAP ALONG WITH VERY LIMITED MOISTURE HAS
PRECLUDED CONVECTION FROM DEVELOPING. CONVECTION SHOULD DEVELOP
FAIRLY QUICKLY THIS EVENING WITH IT TRANSFORMING INTO AN MCS THAT
EXITS THE AREA AROUND DAWN FRIDAY. MCS IN TURN WILL HELP PUSH THE
COLD FRONT SOUTH TO THE IA/MO BORDER WITH THE NEXT WAVE ARRIVING
FRIDAY AFTERNOON.

THE WAVE ON FRIDAY SHOULD INITIATE CONVECTION DURING THE
AFTERNOON/EVENING WITH DRY EASTERLY FLOW SETTING UP BY SATURDAY
MORNING. STALLED FRONT TO RETURN SATURDAY NIGHT/SUNDAY AND THIS
COULD GET INTERESTING IF THE MODELS ARE CORRECT. POTENTIAL IS THERE
FOR A MODERATE TO POSSIBLY HEAVY RAIN EVENT OVER ABOUT THE NORTH
HALF OF THE CWFA.

AFTER A QUIET MONDAY THROUGH TUESDAY MORNING...THE NEXT WAVE ARRIVES
TUESDAY AFTERNOON INTO WEDNESDAY BRINGING ANOTHER ROUND OF PRECIP TO
THE AREA. WEDNESDAY NIGHT AND THURSDAY LOOK DRY ATTM.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...SEVERE THUNDERSTORM WATCH TIL MIDNIGHT NORTH OF HIGHWAY 78.
IL...SEVERE THUNDERSTORM WATCH TIL MIDNIGHT ROCK ISLAND AND MERCER.
MO...NONE.

ERVIN/08

Hazardous weather outlook, Apr 13, 1:55 PM CDT, 5 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
155 PM CDT THU APR 13 2006

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-141015-
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-
155 PM CDT THU APR 13 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...THIS AFTERNOON AND TONIGHT

THE ENTIRE OUTLOOK AREA REMAINS IN A SLIGHT RISK OF SEVERE
THUNDERSTORMS...FOR MAINLY THIS EVENING.

SCATTERED THUNDERSTORMS ARE LIKELY TO DEVELOP TOWARD EVENING
OVER SOUTHERN MINNESOTA AND PORTIONS OF NORTH CENTRAL AND
NORTHEAST IOWA. THESE STORMS MAY THEN DEVELOP INTO A COMPLEX AND
MOVE QUICKLY SOUTHEAST ACROSS EASTERN IOWA AND NORTHWEST ILLINOIS
TONIGHT BETWEEN 7 PM AND 1 AM. THE MAIN THREAT FROM THESE STORMS
WILL BE DAMAGING STRAIGHT LINE WINDS OF 60 TO 80 MPH. SECONDARY
THREATS WILL BE LARGE HAIL AND HEAVY RAIN. THE PORTION OF THE
OUTLOOK AREA MOST AT RISK IS GENERALLY NORTHEAST OF A LINE FROM
WASHINGTON IOWA...TO MONMOUTH ILLINOIS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS A CONTINUED RISK FOR SEVERE WEATHER ACROSS PORTIONS OF
THE OUTLOOK AREA FRIDAY THROUGH SATURDAY NIGHT AS A STRONG FRONT
LINGERS IN THE REGION. ON FRIDAY...THERE IS A SLIGHT RISK FOR
SEVERE STORMS FOR AREAS SOUTH OF INTERSTATE 80 IN THE AFTERNOON
AND EVENING. THE AREA OF MAIN CONCERN WILL BE NEAR A STALLED FRONTAL
WEST TO EAST BOUNDARY IN THE VICINITY OF SOUTHEAST IOWA...NORTHEAST
MISSOURI INTO WEST CENTRAL ILLINOIS. CONDITIONS IN THIS AREA MAY
BE FAVORABLE FOR SUPERCELL THUNDERSTORMS CAPABLE OF PRODUCING
LARGE HAIL AND DAMAGING WIND.

A MORE WIDESPREAD SEVERE WEATHER EVENT IS POSSIBLE SATURDAY INTO
SATURDAY NIGHT ACROSS THE ENTIRE OUTLOOK AREA AS A STRONG UPPER
LEVEL SYSTEM MOVES THROUGH THE REGION. SUPERCELL THUNDERSTORMS
WILL BE POSSIBLE AS A WARM FRONT LIFTS NORTHEAST IN THE AFTERNOON.
THESE MAY BE CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WIND...AND
ISOLATED TORNADOES. HEAVY RAINFALL WILL ALSO BE POSSIBLE...WHICH
MAY CAUSE MINOR FLOODING AND RISING RIVER LEVELS.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING.

MCCLURE

In the hours before

Local storm report, Apr 13, 7:08 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
708 PM CDT THU APR 13 2006

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

0707 PM     HAIL             2 W GARRISON            42.14N 92.18W
04/13/2006  E1.00 INCH       BENTON             IA   LAW ENFORCEMENT

&&

RAYW

Local storm report, Apr 13, 7:15 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
715 PM CDT THU APR 13 2006

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

0714 PM     HAIL             VICTOR                  41.73N 92.29W
04/13/2006  E0.88 INCH       IOWA               IA   LAW ENFORCEMENT

&&

RAYW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 7:16 PM CDT	Severe Thunderstorm Warning	DVN	Iowa	44 min
Apr 13, 7:20 PM CDT	Severe Thunderstorm Warning	DVN	Linn	55 min
Apr 13, 7:32 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	58 min
Apr 13, 7:37 PM CDT	Severe Thunderstorm Warning	DVN	Jones	53 min
Apr 13, 7:39 PM CDT	Tornado Warning	DVN	Linn	51 min
Apr 13, 7:45 PM CDT	Tornado Warning	DVN	Benton	45 min
Apr 13, 7:55 PM CDT	Tornado Warning	DVN	Jones	65 min
Apr 13, 7:57 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque	63 min
Apr 13, 7:58 PM CDT	Tornado Warning	DVN	Johnson	62 min
Apr 13, 8:07 PM CDT	Severe Thunderstorm Warning	DVN	Benton	53 min
Apr 13, 8:12 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	63 min
Apr 13, 8:18 PM CDT	Tornado Warning	DVN	Cedar	57 min
Apr 13, 8:23 PM CDT	Severe Thunderstorm Warning	DVN	Delaware	52 min
Apr 13, 8:23 PM CDT	Tornado Warning	DVN	Muscatine	67 min
Apr 13, 8:28 PM CDT	Severe Thunderstorm Warning	DVN	Linn	62 min
Apr 13, 8:46 PM CDT	Severe Thunderstorm Warning	DVN	Clinton	59 min
Apr 13, 8:47 PM CDT	Tornado Warning	DVN	Johnson	58 min
Apr 13, 8:53 PM CDT	Severe Thunderstorm Warning	DVN	Benton	52 min
Apr 13, 8:56 PM CDT	Tornado Warning	DVN	Scott	64 min
Apr 13, 8:59 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque	43 min
Apr 13, 9:07 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	53 min
Apr 13, 9:10 PM CDT	Tornado Warning	DVN	Cedar	49 min
Apr 13, 9:14 PM CDT	Severe Thunderstorm Warning	DVN	Linn	48 min
Apr 13, 9:23 PM CDT	Severe Thunderstorm Warning	DVN	Jones	67 min
Apr 13, 9:26 PM CDT	Severe Thunderstorm Warning	DVN	Scott	37 min
Apr 13, 9:26 PM CDT	Tornado Warning	DVN	Muscatine	39 min
Apr 13, 9:34 PM CDT	Severe Thunderstorm Warning	DVN	Delaware	56 min
Apr 13, 9:36 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	54 min
Apr 13, 10:04 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	56 min
Apr 13, 10:28 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque	50 min
Apr 13, 10:32 PM CDT	Severe Thunderstorm Warning	DVN	Clinton	49 min
Apr 13, 10:53 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	34 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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.