Alert archive / Illinois / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 166, NWS St. Louis, MO

June 28, 20186 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 28, 2018, 6:21 PM CDT for 6 counties in Illinois. It was in force for 69 min. 5 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: Jun 28, 2018, 6:21 PM CDT (23:21 UTC)
Expired: Jun 28, 2018, 7:30 PM CDT
In force: 69 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clinton County, IL, Marion County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 127 km from the middle of the area, began a volume at 23:23 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
Jun 28, 6:28 PM CDT	TSTM WND DMG	Nashville, IL	WIDESPREAD TREE DAMAGE ACROSS WASHINGTON COUNTY.
Jun 28, 6:30 PM CDT	TSTM WND GST 41	2 E Centralia, IL
Jun 28, 6:30 PM CDT	TSTM WND GST 45	Hoyleton, IL
Jun 28, 6:31 PM CDT	TSTM WND DMG	Centralia, IL	NUMEROUS TREES SNAPPED. TIME ESTIMATED FROM RADAR. TWITTER REPORT.
Jun 28, 6:37 PM CDT	TSTM WND GST 52	2 E Centralia, IL

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
Jun 28, 1:04 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 28, 5:33 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.4 hours before the alert went out and 209 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: 7 J/kg
Mixed-layer CIN: -572 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

164 
WUUS53 KLSX 282321
SVRLSX
ILC027-121-133-157-163-189-290030-
/O.NEW.KLSX.SV.W.0166.180628T2321Z-180629T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
621 PM CDT THU JUN 28 2018

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southeastern Clinton County in south central Illinois...
  East central Monroe County in southwestern Illinois...
  Washington County in south central Illinois...
  Southern Marion County in south central Illinois...
  Eastern Randolph County in southwestern Illinois...
  Southeastern St. Clair County in southwestern Illinois...

* Until 730 PM CDT.

* At 621 PM CDT, severe thunderstorms were located along a line
  extending from near Altamont to near New Memphis to St. Louis,
  moving southeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Trained weather spotters. Numerous power lines and trees 
           have been reported down with this line of storms.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Centralia, Salem, Freeburg, Sparta, Nashville, Bremen, Smithton,
  Steeleville, New Athens, Marissa, Okawville, Wamac, Central City,
  Odin, Percy, Coulterville, Tilden, Lively Grove, Irvington and
  Ashley.

This includes the following highways...
 Interstate 57 in Illinois between exits 109 and 116.
 Interstate 64 in Illinois between exits 41 and 61.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3847 8914 3821 8915 3822 8959 3795 8960
      3784 8966 3843 9011 3841 8966 3872 8875
      3866 8869 3847 8870
TIME...MOT...LOC 2321Z 328DEG 44KT 3908 8869 3840 8967 3862 9022 

HAIL...<.75IN
WIND...60MPH
 
$$

Kanofsky

2 follow-up statements

923 
WWUS53 KLSX 290017
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
717 PM CDT THU JUN 28 2018

ILC027-121-290027-
/O.CAN.KLSX.SV.W.0166.000000T0000Z-180629T0030Z/
Clinton IL-Marion IL-
717 PM CDT THU JUN 28 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CLINTON AND
SOUTHERN MARION COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
south central and southwestern Illinois. A Severe Thunderstorm Watch
also remains in effect until 100 AM CDT for southwestern Illinois.

LAT...LON 3821 8915 3822 8959 3795 8960 3784 8966
      3830 9000 3836 8960 3837 8914
TIME...MOT...LOC 0017Z 327DEG 44KT 3850 8824 3782 8922 3822 9003 

$$

ILC133-157-163-189-290030-
/O.CON.KLSX.SV.W.0166.000000T0000Z-180629T0030Z/
Monroe IL-Washington IL-Randolph IL-St. Clair IL-
717 PM CDT THU JUN 28 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR EASTERN MONROE...SOUTHERN WASHINGTON...EASTERN RANDOLPH AND
SOUTHEASTERN ST. CLAIR COUNTIES...

At 717 PM CDT, severe thunderstorms were located along a line
extending from 9 miles south of Schnell to De Soto to near Red Bud,
moving southeast at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Sparta, Nashville, Bremen, Steeleville, New Athens, Marissa, Percy,
Coulterville, Tilden, Lively Grove, Ashley, Baldwin, Posen, Eden,
Blair, Beaucoup, Lenzburg, Richview, Oakdale and Houston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3821 8915 3822 8959 3795 8960 3784 8966
      3830 9000 3836 8960 3837 8914
TIME...MOT...LOC 0017Z 327DEG 44KT 3850 8824 3782 8922 3822 9003 

HAIL...<.75IN
WIND...60MPH
 
$$

Kanofsky

184 
WWUS53 KLSX 290028
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
728 PM CDT THU JUN 28 2018

ILC133-157-163-189-290037-
/O.EXP.KLSX.SV.W.0166.000000T0000Z-180629T0030Z/
Monroe IL-Washington IL-Randolph IL-St. Clair IL-
728 PM CDT THU JUN 28 2018

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MONROE...SOUTHERN
WASHINGTON...EASTERN RANDOLPH AND SOUTHEASTERN ST. CLAIR COUNTIES
WILL EXPIRE AT 730 PM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
south central and southwestern Illinois. A Severe Thunderstorm Watch
also remains in effect until 100 AM CDT for southwestern Illinois.

Remember, a Severe Thunderstorm Warning still remains in effect for
portions of Randolph and Monroe Counties until 800 PM CDT.

LAT...LON 3821 8915 3822 8959 3795 8960 3784 8966
      3830 9000 3836 8960 3837 8914
TIME...MOT...LOC 0027Z 328DEG 44KT 3840 8816 3772 8914 3812 8995 

$$

Kanofsky

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 2:37 PM CDT	Severe Thunderstorm Warning	LSX	Adams	53 min
Jun 28, 3:21 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	69 min
Jun 28, 3:52 PM CDT	Excessive Heat Warning	LSX	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	3 days
Jun 28, 4:00 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Pike	60 min
Jun 28, 4:18 PM CDT	Special Weather Statement	LSX	Greene, Macoupin	57 min
Jun 28, 4:35 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	40 min
Jun 28, 4:39 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Macoupin, Montgomery, Pike	66 min
Jun 28, 5:02 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Macoupin, Madison	73 min
Jun 28, 5:22 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Macoupin, Madison, Marion and 4 more	83 min
Jun 28, 5:29 PM CDT	Tornado Warning	LSX	Madison	16 min
Jun 28, 5:54 PM CDT	Tornado Warning	LSX	Saint Clair	17 min
Jun 28, 5:59 PM CDT	Areal Flood Advisory	LSX	Jersey, Madison	3 hr
Jun 28, 6:48 PM CDT	Areal Flood Advisory	LSX	Bond, Clinton, Fayette, Madison, Marion, Monroe and 2 more	3 hr
Jun 28, 6:56 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph	64 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2018 Every severe thunderstorm warning in 2018

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.