Alert archive / Illinois / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 21, NWS Quad Cities, IA

March 31, 20234 counties in Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Mar 31, 2023, 5:56 PM CDT for 4 counties in Illinois. It was in force for 34 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: Mar 31, 2023, 5:56 PM CDT (22:56 UTC)
Expired: Mar 31, 2023, 6:30 PM CDT
In force: 34 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Hancock County, IL, Henderson County, IL, McDonough County, IL, Warren County, IL

The radar

The Quad Cities radar (KDVN), 120 km from the middle of the area, began a volume at 22:56 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
Mar 31, 6:00 PM CDT	TSTM WND DMG	4 Sw Eleanor, IL	CORRECTS THE TIME OF THE TSTM WND DMG REPORT FROM 4 SW ELEANOR. TOPS SNAPPED OUT OF TREES. ESTIMATED WINDS OF 70 TO 75 MPH.
Mar 31, 6:22 PM CDT	TSTM WND DMG	4 Sw Eleanor, IL	TOPS SNAPPED OUT OF TREES. ESTIMATED WINDS OF 70 TO 75 MPH.

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.

Issued	Product	Office	Lasted
Mar 31, 11:46 AM CDT	Tornado Watch PDS	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.9 hours before the alert went out and 122 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 897 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 433 m²/s²
0-3 km storm-relative helicity: 424 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

938 
WUUS53 KDVN 312256
SVRDVN
ILC067-071-109-187-312330-
/O.NEW.KDVN.SV.W.0021.230331T2256Z-230331T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
556 PM CDT Fri Mar 31 2023

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Eastern Hancock County in west central Illinois...
  Henderson County in west central Illinois...
  Warren County in west central Illinois...
  McDonough County in west central Illinois...

* Until 630 PM CDT.

* At 556 PM CDT, severe thunderstorms were located along a line
  extending from near Gladstone to near Bowen, moving east at 65 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  Augusta, Biggsville, Plymouth and Hancock County Fairgrounds 
  around 600 PM CDT.
  Kirkwood, Media and Smithshire around 605 PM CDT.
  Monmouth, Larchland, Ponemah and Monmouth Municipal Airport around 
  610 PM CDT.
  Coldbrook, Berwick, Ormonde, Cameron and Doddsville around 615 PM 
  CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for west central
Illinois...and southeastern Iowa.

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

A Tornado Watch remains in effect until 800 PM CDT for west central
Illinois...and southeastern Iowa.

&&

LAT...LON 4020 9107 4092 9098 4093 9096 4097 9096
      4102 9044 4028 9045 4028 9091 4019 9091
TIME...MOT...LOC 2256Z 279DEG 55KT 4089 9093 4022 9102 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Ervin

1 follow-up statement

465 
WWUS53 KDVN 312322
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
622 PM CDT Fri Mar 31 2023

ILC067-071-109-187-312332-
/O.EXP.KDVN.SV.W.0021.000000T0000Z-230331T2330Z/
Hancock IL-Henderson IL-Warren IL-McDonough IL-
622 PM CDT Fri Mar 31 2023

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN HANCOCK...HENDERSON...
WARREN AND MCDONOUGH COUNTIES WILL EXPIRE AT 630 PM CDT...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds are still possible with
these thunderstorms.

A Tornado Watch remains in effect until 800 PM CDT for west central
Illinois...and southeastern Iowa.

LAT...LON 4020 9107 4092 9098 4093 9096 4097 9096
      4102 9044 4028 9045 4028 9091 4019 9091
TIME...MOT...LOC 2322Z 279DEG 55KT 4083 9045 4016 9054 

$$

Ervin

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 31, 3:11 AM CDT	Wind Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	34 hr
Mar 31, 1:13 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Hancock	47 min
Mar 31, 2:07 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Mercer, Rock Island	38 min
Mar 31, 2:15 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island	45 min
Mar 31, 2:56 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island	49 min
Mar 31, 2:59 PM CDT	Tornado Warning	DVN	Henderson, Warren	46 min
Mar 31, 3:26 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Rock Island, Whiteside	49 min
Mar 31, 3:31 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	44 min
Mar 31, 3:50 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry	40 min
Mar 31, 4:12 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Whiteside	33 min
Mar 31, 4:14 PM CDT	Severe Thunderstorm Warning	DVN	Bureau	19 min
Mar 31, 4:25 PM CDT	Tornado Warning	DVN	Bureau, Henry	50 min
Mar 31, 5:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Henderson, Henry, Mercer, Rock Island, Warren	38 min
Mar 31, 5:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Hancock, Henderson, McDonough, Warren	51 min
Mar 31, 5:44 PM CDT	Severe Thunderstorm Warning Destructive damage threat	DVN	Carroll, Jo Daviess	61 min
Mar 31, 5:45 PM CDT	Tornado Warning	DVN	Mercer, Rock Island	45 min
Mar 31, 5:54 PM CDT	Tornado Warning	DVN	Henderson, Mercer, Rock Island, Warren	26 min
Mar 31, 5:59 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Henderson, Henry, Mercer, Rock Island, Warren, Whiteside	46 min
Mar 31, 6:10 PM CDT	Tornado Warning	DVN	Jo Daviess	35 min
Mar 31, 6:12 PM CDT	Tornado Warning Tornado observed	DVN	Carroll, Jo Daviess	32 min
Mar 31, 6:18 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Carroll, Jo Daviess, Stephenson	27 min
Mar 31, 6:29 PM CDT	Tornado Warning	DVN	Bureau, Henry, Whiteside	31 min
Mar 31, 6:32 PM CDT	Tornado Warning	DVN	Bureau, Henry	28 min
Mar 31, 6:35 PM CDT	Tornado Warning	DVN	Carroll, Stephenson, Whiteside	25 min
Mar 31, 6:36 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Bureau, Henry, Putnam, Whiteside	54 min
Mar 31, 6:41 PM CDT	Tornado Warning	DVN	Jo Daviess, Stephenson	37 min
Mar 31, 6:42 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Carroll, Henry, Whiteside	18 min
Mar 31, 6:47 PM CDT	Tornado Warning Tornado observed	DVN	Bureau, Henry, Whiteside	15 min
Mar 31, 6:48 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Carroll, Jo Daviess, Stephenson, Whiteside	42 min
Mar 31, 6:59 PM CDT	Tornado Warning Tornado observed	DVN	Carroll, Stephenson	25 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2023 Every severe thunderstorm warning in 2023

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.