Alert archive / Iowa / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 13, NWS Quad Cities, IA

May 7, 2004Cedar County, Muscatine County, Scott County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at May 7, 2004, 3:49 AM CDT for Cedar County, Muscatine County, Scott County, Iowa. It was in force for 26 min. 10 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
May 7, 2004, 3:49 AM CDT (08:49 UTC)
Expired
May 7, 2004, 4:15 AM CDT
In force
26 min
Issued by
NWS Quad Cities, IA
Area
Counties, with a storm outline in the text

Counties Cedar County, IA, Muscatine County, IA, Scott County, IA

The radar

The Quad Cities radar (KDVN), 29 km from the middle of the area, began a volume at 08:49 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

TimeReportWhereRemark
May 7, 4:04 AM CDTTSTM WND DMGPleasant Prarie, IASEMI TRUCK BLOWN OVER ON HIGHWAY 61 AT THE 97 MILE MARKER.
May 7, 4:04 AM CDTTSTM WND DMGPleasant Prarie, IASEMI TRUCK BLOWN OVER ON HIGHWAY 61 AT THE 97 MILE MARKER.
May 7, 4:05 AM CDTTSTM WND DMGAtalissa, IASIGNIFICANT POWERLINE DAMAGE, 2 SEMI TRAILERS BLOWN OVER.
May 7, 4:05 AM CDTTSTM WND DMGAtalissa, IASIGNIFICANT POWERLINE DAMAGE, 2 SEMI TRAILERS BLOWN OVER.
May 7, 4:05 AM CDTTSTM WND DMGSweetland Center, IASEVERAL GRAIN BINS DESTROYED. TREES BLOWN INTO HOUSES IN SWEETLAND CENTER.
May 7, 4:05 AM CDTTSTM WND DMGSweetland Center, IASEVERAL GRAIN BINS DESTROYED. TREES BLOWN INTO HOUSES IN SWEETLAND CENTER.
May 7, 4:05 AM CDTTSTM WND GST 622 N Muscatine, IA
May 7, 4:05 AM CDTTSTM WND GST 622 N Muscatine, IA
May 7, 4:25 AM CDTHAIL 0.753 E Blue Grass, IAWITH HEAVY RAIN.
May 7, 4:25 AM CDTHAIL 0.753 E Blue Grass, IAWITH HEAVY RAIN.

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 00:00Z, 8.8 hours before the alert went out and 35 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 00:00Z on 2004-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2446 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2004-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
2446 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
1583 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
217 m²/s²
Significant tornado parameter
0.8
Supercell composite
9.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDVN 070849
SVRDVN
IAC031-139-163-070915-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
349 AM CDT FRI MAY 7 2004

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CEDAR COUNTY IN EAST CENTRAL IOWA
  NORTHERN MUSCATINE COUNTY IN EAST CENTRAL IOWA
  WESTERN SCOTT COUNTY IN EAST CENTRAL IOWA

* UNTIL 415 AM CDT

* AT 344 AM CDT...TRAINED SPOTTERS REPORTED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED
  NEAR ATALISSA...OR ALONG A LINE EXTENDING FROM 9 MILES SOUTH OF
  TIPTON TO 10 MILES NORTHWEST OF MUSCATINE...AND MOVING EAST AT 35
  MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WILTON BY 355 AM CDT
  DURANT BY 400 AM CDT
  WALCOTT BY 410 AM CDT
  MONTPELIER...AND BLUE GRASS BY 415 AM CDT

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

LAT...LON 4175 9114 4145 9134 4143 9095 4147 9071
          4155 9051 4173 9068

$$

LRE

The office that day

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

IssuedProductOfficeCountiesLasted
May 7, 1:56 AM CDTSevere Thunderstorm WarningDVNBenton64 min
May 7, 2:33 AM CDTSevere Thunderstorm WarningDVNJones, Linn57 min
May 7, 4:15 AM CDTSevere Thunderstorm WarningDVNScott30 min
May 7, 6:54 AM CDTSevere Thunderstorm WarningDVNCedar, Johnson36 min
May 7, 8:13 AM CDTSevere Thunderstorm WarningDVNScott47 min
May 7, 10:35 AM CDTSevere Thunderstorm WarningDVNCedar, Johnson55 min
May 7, 11:04 AM CDTSevere Thunderstorm WarningDVNBenton, Linn56 min
May 7, 11:43 AM CDTSevere Thunderstorm WarningDVNJones32 min
May 7, 4:21 PM CDTSevere Thunderstorm WarningDVNDelaware, Dubuque54 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2004Every severe thunderstorm warning in 2004

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.