Alert archive / Illinois / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 9, NWS St. Louis, MO

March 2, 2020Washington County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 2, 2020, 7:20 PM CST for Washington County, Illinois. It was in force for 40 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
Mar 2, 2020, 7:20 PM CST (01:20 UTC)
Expired
Mar 2, 2020, 8:00 PM CST
In force
40 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Washington County, IL

The radar

The St Louis radar (KLSX), 115 km from the middle of the area, began a volume at 01:21 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
Mar 2, 7:35 PM CSTHAIL 1Addieville, ILVIA TWITTER.

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

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.3 hours before the alert went out and 210 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, Lincoln, IL at 00:00Z on 2020-03-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lincoln, IL at 00:00Z on 2020-03-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1590 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
214 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

434 
WUUS53 KLSX 030120
SVRLSX
ILC189-030200-
/O.NEW.KLSX.SV.W.0009.200303T0120Z-200303T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
720 PM CST Mon Mar 2 2020

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Central Washington County in south central Illinois...

* Until 800 PM CST.

* At 720 PM CST, a severe thunderstorm was located near Lively Grove,
  moving east at 55 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Nashville, Centralia, Wamac, Lively Grove, Irvington, Ashley,
  Beaucoup, Hoyleton, Johannisburg, Richview, Addieville, New Minden,
  Venedy, Huegely, Elkton and Stone Church.

This includes Interstate 64 in Illinois between exits 50 and 61.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3827 8970 3838 8970 3851 8917 3850 8915
      3834 8915
TIME...MOT...LOC 0120Z 252DEG 48KT 3833 8968 

HAIL...1.00IN
WIND...<50MPH
 
$$

CVKING
2 follow-up statements
312 
WWUS53 KLSX 030136
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
736 PM CST Mon Mar 2 2020

ILC189-030200-
/O.CON.KLSX.SV.W.0009.000000T0000Z-200303T0200Z/
Washington IL-
736 PM CST Mon Mar 2 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CST
FOR CENTRAL WASHINGTON COUNTY...

At 736 PM CST, a severe thunderstorm was located near Nashville,
moving east at 55 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Nashville, Centralia, Wamac, Irvington, Ashley, Beaucoup, Hoyleton,
Richview, Addieville, New Minden and Huegely.

This includes Interstate 64 in Illinois between exits 50 and 61.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3831 8958 3841 8959 3851 8917 3850 8915
      3834 8915
TIME...MOT...LOC 0136Z 252DEG 48KT 3840 8942 

HAIL...1.00IN
WIND...<50MPH
 
$$

CVKING
064 
WWUS53 KLSX 030150
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
750 PM CST Mon Mar 2 2020

ILC189-030200-
/O.EXP.KLSX.SV.W.0009.000000T0000Z-200303T0200Z/
Washington IL-
750 PM CST Mon Mar 2 2020

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WASHINGTON COUNTY WILL
EXPIRE AT 800 PM CST...
    
The severe thunderstorm which prompted the warning has 
weakened. Therefore, the warning will be allowed to expire.

LAT...LON 3831 8958 3841 8959 3851 8917 3850 8915
      3834 8915
TIME...MOT...LOC 0150Z 252DEG 48KT 3845 8921 

$$

CVKING

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 2, 7:00 PM CSTSevere Thunderstorm WarningLSXMonroe, Saint Clair23 min

Nearby

Severe 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.