Alert archive / Illinois / Tornado Warnings in 2020

Tornado Warning 7, NWS Quad Cities, IA

March 28, 2020Mercer County, Warren County, Illinois

NWS Quad Cities, IA issued this tornado warning at Mar 28, 2020, 7:14 PM CDT for Mercer County, Warren County, Illinois. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 28, 2020, 7:14 PM CDT (00:14 UTC)
Expired: Mar 28, 2020, 7:45 PM CDT
In force: 31 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Mercer County, IL, Warren County, IL

The radar

The Quad Cities radar (KDVN), 64 km from the middle of the area, began a volume at 00:16 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.

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 28, 2:45 PM CDT	Tornado Watch PDS	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.2 hours before the alert went out and 65 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: 504 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 963 m above ground
0-6 km bulk shear: 88 kt
0-1 km storm-relative helicity: 480 m²/s²
0-3 km storm-relative helicity: 520 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 9.3

Open this sounding in Storm Lab

The text

As transmitted.

544 
WFUS53 KDVN 290014
TORDVN
ILC131-187-290045-
/O.NEW.KDVN.TO.W.0007.200329T0014Z-200329T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
714 PM CDT Sat Mar 28 2020

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northeastern Warren County in west central Illinois...
  Southeastern Mercer County in northwestern Illinois...

* Until 745 PM CDT.
    
* At 713 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near North Henderson, or 9 miles northeast of Monmouth,
  moving northeast at 55 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  North Henderson around 720 PM CDT.
  New Windsor around 725 PM CDT.

Other locations impacted by this tornadic thunderstorm include Alexis
and Gerlaw.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4095 9058 4103 9067 4122 9044 4102 9044
TIME...MOT...LOC 0013Z 230DEG 47KT 4103 9055 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 28, 7:27 PM CDT	Severe Thunderstorm Warning	DVN	Henry	48 min
Mar 28, 7:33 PM CDT	Tornado Warning	DVN	Henry	42 min
Mar 28, 8:07 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry, Whiteside	38 min
Mar 28, 8:20 PM CDT	Tornado Warning	DVN	Henry, Whiteside	18 min
Mar 28, 9:26 PM CDT	Wind Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	22 hr
Mar 29, 10:35 AM CDT	River Flood Warning	DVN	Whiteside	50 hr

Nearby

Tornado Warnings in Illinois, 2020 Every tornado warning in 2020 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.