Alert archive / Iowa / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Quad Cities, IA

April 7, 2020Muscatine County, Scott County, Iowa; Mercer County, Rock Island County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 7, 2020, 9:27 PM CDT for Muscatine County, Scott County, Iowa; Mercer County, Rock Island County, Illinois. It was in force for 33 min. 2 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 7, 2020, 9:27 PM CDT (02:27 UTC)
Expired
Apr 7, 2020, 10:00 PM CDT
In force
33 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.25 in
Wind
50.0 mph

Counties Muscatine County, IA, Scott County, IA, Mercer County, IL, Rock Island County, IL

The radar

The Quad Cities radar (KDVN), 31 km from the middle of the area, began a volume at 02:30 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 7, 9:44 PM CDTHAIL 1Taylor Ridge, ILVIA SOCIAL MEDIA. MANLY NICKEL SIZE BUT SOME QUARTER SIZE HAIL.
Apr 7, 9:45 PM CDTHAIL 0.53 Wnw Oak Grove, ILPEA TO DIMES.

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

The watch it was issued in

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

IssuedProductOfficeLasted
Apr 7, 5:26 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.5 hours before the alert went out and 33 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 2020-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1200 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 2020-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939587897117Sfc1 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
1200 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
1453 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.8

Open this sounding in Storm Lab

The text

As transmitted.

910 
WUUS53 KDVN 080227
SVRDVN
ILC131-161-IAC139-163-080315-
/O.NEW.KDVN.SV.W.0021.200408T0227Z-200408T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
927 PM CDT Tue Apr 7 2020

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Southwestern Rock Island County in northwestern Illinois...
  Northeastern Mercer County in northwestern Illinois...
  South central Scott County in east central Iowa...
  East central Muscatine County in east central Iowa...

* Until 1015 PM CDT.

* At 926 PM CDT, a severe thunderstorm was located over Fairport, or
  10 miles south of Durant, moving east at 45 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Trained weather spotters.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Davenport, Moline, Rock Island, Milan, Coal Valley, Buffalo,
  Andalusia, New Windsor, Sherrard, Reynolds, Oak Grove, Cable,
  Taylor Ridge, Montpelier, Illinois City, Fairport, Boden,
  Preemption, Edgington and Clark's Ferry Recreation Area.

This includes Interstate 280 between mile markers 11 and 17.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

&&

LAT...LON 4120 9044 4142 9097 4150 9086 4145 9043
      4121 9044
TIME...MOT...LOC 0226Z 286DEG 38KT 4146 9087 

HAIL...1.25IN
WIND...<50MPH
 
$$

Ervin
2 follow-up statements
277 
WWUS53 KDVN 080243
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
943 PM CDT Tue Apr 7 2020

IAC139-080251-
/O.CAN.KDVN.SV.W.0021.000000T0000Z-200408T0315Z/
Muscatine IA-
943 PM CDT Tue Apr 7 2020

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MUSCATINE COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northwestern Illinois...and east central Iowa.

LAT...LON 4120 9044 4140 9085 4149 9074 4145 9043
      4121 9044
TIME...MOT...LOC 0241Z 285DEG 38KT 4141 9067 

$$

ILC131-161-IAC163-080315-
/O.CON.KDVN.SV.W.0021.000000T0000Z-200408T0315Z/
Rock Island IL-Mercer IL-Scott IA-
943 PM CDT Tue Apr 7 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR SOUTH CENTRAL ROCK ISLAND...NORTHEASTERN MERCER AND SOUTH CENTRAL
SCOTT COUNTIES...

At 941 PM CDT, a severe thunderstorm was located over Taylor Ridge,
or 7 miles southwest of Rock Island, moving east at 45 mph.

HAZARD...Half dollar size hail.

SOURCE...Trained weather spotters.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Davenport, Moline, Rock Island, Milan, Coal Valley, Buffalo,
Andalusia, New Windsor, Sherrard, Reynolds, Oak Grove, Cable, Taylor
Ridge, Preemption, Edgington, Blackhawk State Park, Coyne Center,
Swedona, Indian Bluff Golf Course and Buffalo Shores.

This includes the following highways...
 Interstate 74 in Illinois between mile markers 5 and 6.
 Interstate 280 between mile markers 11 and 18.

LAT...LON 4120 9044 4140 9085 4149 9074 4145 9043
      4121 9044
TIME...MOT...LOC 0241Z 285DEG 38KT 4141 9067 

HAIL...1.25IN
WIND...<50MPH
 
$$

DC
231 
WWUS53 KDVN 080300
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1000 PM CDT Tue Apr 7 2020

IAC163-ILC131-161-080310-
/O.CAN.KDVN.SV.W.0021.000000T0000Z-200408T0315Z/
Rock Island IL-Mercer IL-Scott IA-
1000 PM CDT Tue Apr 7 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ROCK ISLAND...
NORTHEASTERN MERCER AND SOUTH CENTRAL SCOTT COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northwestern Illinois...and east central Iowa.

LAT...LON 4120 9044 4140 9085 4149 9074 4145 9043
      4121 9044
TIME...MOT...LOC 0259Z 286DEG 38KT 4135 9041 

$$

DC

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 7, 7:14 PM CDTSevere Thunderstorm WarningDVNCedar, Jones61 min
Apr 7, 7:29 PM CDTSevere Thunderstorm WarningDVNCedar, Johnson, Linn46 min
Apr 7, 7:35 PM CDTSevere Thunderstorm WarningDVNCedar, Clinton, Scott55 min
Apr 7, 8:03 PM CDTSevere Thunderstorm WarningDVNCedar, Scott27 min
Apr 7, 8:06 PM CDTSevere Thunderstorm WarningDVNCedar, Iowa, Johnson, Muscatine39 min
Apr 7, 8:17 PM CDTSevere Thunderstorm WarningDVNScott58 min
Apr 7, 8:45 PM CDTSevere Thunderstorm WarningDVNIowa, Johnson, Keokuk, Washington30 min
Apr 7, 9:02 PM CDTSpecial Weather StatementDVNMuscatine28 min
Apr 7, 9:07 PM CDTSevere Thunderstorm WarningDVNMuscatine, Scott23 min
Apr 7, 9:14 PM CDTSevere Thunderstorm WarningDVNJohnson, Louisa, Muscatine, Washington31 min
Apr 7, 9:40 PM CDTSevere Thunderstorm WarningDVNLouisa, Muscatine35 min
Apr 8, 4:22 AM CDTDense Fog AdvisoryDVNBenton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 5 more5 hr
Apr 8, 2:04 PM CDTSpecial Weather StatementDVNBuchanan, Delaware56 min
Apr 8, 2:22 PM CDTSevere Thunderstorm WarningDVNHenry, Jefferson, Van Buren53 min
Apr 8, 2:54 PM CDTSevere Thunderstorm WarningDVNVan Buren36 min
Apr 8, 2:56 PM CDTSevere Thunderstorm WarningDVNDes Moines, Henry, Lee64 min
Apr 8, 3:07 PM CDTSevere Thunderstorm WarningDVNLee38 min
Apr 8, 3:41 PM CDTSevere Thunderstorm WarningDVNLee49 min
Apr 8, 4:09 PM CDTSevere Thunderstorm WarningDVNMuscatine25 min
Apr 7, 7:18 PM CDTSevere Thunderstorm WarningDVNStephenson27 min
Apr 7, 9:57 PM CDTSevere Thunderstorm WarningDVNHenry, Mercer, Rock Island33 min
Apr 7, 10:09 PM CDTSevere Thunderstorm WarningDVNMercer, Warren36 min
Apr 7, 10:43 PM CDTSevere Thunderstorm WarningDVNMercer, Warren17 min
Apr 8, 3:26 PM CDTSevere Thunderstorm WarningDVNHancock, McDonough49 min
Apr 8, 3:29 PM CDTSevere Thunderstorm WarningDVNHancock, Henderson, McDonough, Warren61 min
Apr 8, 3:49 PM CDTSevere Thunderstorm WarningDVNWarren26 min
Apr 8, 3:50 PM CDTSevere Thunderstorm WarningDVNMcDonough40 min
Apr 8, 3:53 PM CDTSevere Thunderstorm WarningDVNBureau, Putnam22 min
Apr 8, 4:56 PM CDTSpecial Weather StatementDVNStark34 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2020Severe Thunderstorm Warnings in Illinois, 2020Every severe thunderstorm warning in 2020

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.