Alert archive / Illinois / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 59, NWS St. Louis, MO

May 21, 20195 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 21, 2019, 7:56 PM CDT for 5 counties in Illinois. It was in force for 53 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: May 21, 2019, 7:56 PM CDT (00:56 UTC)
Expired: May 21, 2019, 8:49 PM CDT
In force: 53 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Bond County, IL, Clinton County, IL, Marion County, IL, Saint Clair County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 94 km from the middle of the area, began a volume at 00:55 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
May 21, 8:18 PM CDT	TSTM WND DMG	Breese, IL	MULTIPLE TREES DOWN, 4-6 INCHES IN DIAMETER. TIME ESTIMATED FROM RADAR.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 22 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 21, 3:10 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.9 hours before the alert went out and 207 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: 667 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 466 m²/s²
0-3 km storm-relative helicity: 506 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

165 
WUUS53 KLSX 220056
SVRLSX
ILC005-027-121-163-189-220200-
/O.NEW.KLSX.SV.W.0059.190522T0056Z-190522T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
756 PM CDT Tue May 21 2019

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Clinton County in south central Illinois...
  Southeastern Bond County in south central Illinois...
  Northern Washington County in south central Illinois...
  Southwestern Marion County in south central Illinois...
  Southeastern St. Clair County in southwestern Illinois...

* Until 900 PM CDT.

* At 755 PM CDT, a severe thunderstorm was located near New Athens,
  moving northeast at 50 mph.

  HAZARD...60 mph wind gusts and nickel size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Centralia, Mascoutah, Breese, New Baden, Carlyle, Trenton, New
  Athens, Aviston, Okawville, Germantown, Albers, Wamac, Central
  City, Beckemeyer, New Memphis, Shattuc, St. Libory, Bartelso,
  Hoyleton and Johannisburg.

This includes Interstate 64 in Illinois between exits 27 and 41.
 
This also includes Carlyle Lake Recreational Area.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for south central
and southwestern Illinois.

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

&&

LAT...LON 3832 8990 3845 8987 3860 8971 3879 8932
      3853 8906 3828 8975
TIME...MOT...LOC 0055Z 230DEG 44KT 3835 8981 

HAIL...0.88IN
WIND...60MPH
 
$$

Kanofsky

4 follow-up statements

984 
WWUS53 KLSX 220111
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
811 PM CDT Tue May 21 2019

ILC163-220119-
/O.CAN.KLSX.SV.W.0059.000000T0000Z-190522T0200Z/
St. Clair IL-
811 PM CDT Tue May 21 2019

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

A Tornado Watch remains in effect until 1000 PM CDT for south central
and southwestern Illinois.

LAT...LON 3853 8906 3830 8970 3860 8971 3879 8932
TIME...MOT...LOC 0109Z 230DEG 44KT 3847 8963 

$$

ILC005-027-121-189-220200-
/O.CON.KLSX.SV.W.0059.000000T0000Z-190522T0200Z/
Clinton IL-Bond IL-Washington IL-Marion IL-
811 PM CDT Tue May 21 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR CLINTON...SOUTHEASTERN BOND...NORTHERN WASHINGTON AND
SOUTHWESTERN MARION COUNTIES...

At 809 PM CDT, a severe thunderstorm was located over New Memphis,
moving northeast at 50 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Centralia, Breese, New Baden, Carlyle, Trenton, Aviston, Okawville,
Germantown, Albers, Wamac, Central City, Beckemeyer, New Memphis,
Shattuc, Bartelso, Hoyleton, Johannisburg, Hoffman, Damiansville and
Junction City.

This also includes Carlyle Lake Recreational Area.
 
This includes Interstate 64 in Illinois between exits 34 and 41.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for south central
and southwestern Illinois.

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

&&

LAT...LON 3853 8906 3830 8970 3860 8971 3879 8932
TIME...MOT...LOC 0109Z 230DEG 44KT 3847 8963 

HAIL...0.88IN
WIND...60MPH
 
$$

Kanofsky

538 
WWUS53 KLSX 220134
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
834 PM CDT Tue May 21 2019

ILC121-189-220144-
/O.CAN.KLSX.SV.W.0059.000000T0000Z-190522T0200Z/
Washington IL-Marion IL-
834 PM CDT Tue May 21 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WASHINGTON AND
SOUTHWESTERN MARION COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM CDT for south central
Illinois.

LAT...LON 3865 8918 3849 8945 3867 8956 3879 8932
TIME...MOT...LOC 0134Z 230DEG 44KT 3867 8933 

$$

ILC005-027-220200-
/O.CON.KLSX.SV.W.0059.000000T0000Z-190522T0200Z/
Clinton IL-Bond IL-
834 PM CDT Tue May 21 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR NORTHEASTERN CLINTON AND SOUTHEASTERN BOND COUNTIES...

At 834 PM CDT, a severe thunderstorm was located near Carlyle, moving
northeast at 50 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Breese, Carlyle, Beckemeyer, Bartelso, Keyesport, Huey and
Stolletown.

This also includes Carlyle Lake Recreational Area.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for south central
Illinois.

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

&&

LAT...LON 3865 8918 3849 8945 3867 8956 3879 8932
TIME...MOT...LOC 0134Z 230DEG 44KT 3867 8933 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

Kanofsky

645 
WWUS53 KLSX 220145
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
845 PM CDT Tue May 21 2019

ILC005-027-220200-
/O.CON.KLSX.SV.W.0059.000000T0000Z-190522T0200Z/
Clinton IL-Bond IL-
845 PM CDT Tue May 21 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR NORTHEASTERN CLINTON AND SOUTHEASTERN BOND COUNTIES...

At 844 PM CDT, a severe thunderstorm was located near Boulder, moving
northeast at 50 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Carlyle, Keyesport and Stolletown. 

This also includes Carlyle Lake Recreational Area.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for south central
Illinois.

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

&&

LAT...LON 3866 8919 3858 8935 3871 8948 3879 8932
TIME...MOT...LOC 0144Z 230DEG 44KT 3875 8920 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

Kanofsky

567 
WWUS53 KLSX 220149
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
849 PM CDT Tue May 21 2019

ILC005-027-220159-
/O.CAN.KLSX.SV.W.0059.000000T0000Z-190522T0200Z/
Clinton IL-Bond IL-
849 PM CDT Tue May 21 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLINTON AND
SOUTHEASTERN BOND COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM CDT for south central
Illinois.

LAT...LON 3866 8919 3858 8935 3871 8948 3879 8932
TIME...MOT...LOC 0148Z 230DEG 44KT 3880 8913 

$$

Kanofsky

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at May 21, 7:01 PM CDT, 55 minutes earlier.

Area forecast discussion, May 21, 7:01 PM CDT, 55 minutes before

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
701 PM CDT Tue May 21 2019

.SHORT TERM...  (Through Late Wednesday Night)
Issued at 437 PM CDT Tue May 21 2019

Line of thunderstorms is expected to move northeast across the CWA
late this afternoon and early this evening. Atmosphere has rapidly
destabilized ahead of it as 60s and lower 70 dewpoints have surged
north into the southern CWA allowing for MLCAPES to jump into the
1000-1500+ J/kg range. This is further evidenced by the appearance
of a well developed cumulus field that is moving northward into
the CWA. Latest RAP low level convergence fields supports CAMS
simulated reflectivity which depicts the current line progressing
eastward across the CWA through the evening. Deep layer and low
layer shear supports the line producing damaging winds with
embedded tornadoes and perhaps some hail given the steep lapse
rates. In addition any discrete storms that do develop ahead of
the line will also be capable of producing all hazards.

Will continue the flash flood watch until midnight. While the line
will be progressive, it will have very heavy rainfall rates.
Therefore cannot rule out a flash flood threat given the already
wet ground over the area. This line will move east of the CWA
after midnight with dry conditions expect by 12Z.

Wednesday looks like about one of the only dry days as the there
will be no upper systems moving across the area. By Wednesday
night however, both the NAM/GFS are showing another weak shortwave
moving over the area at the some time that a front will be aligned
over Missouri and Illinois. Will go with a chance of showers and
thunderstorms as there may be some chance for a few strong storms.

Britt

.LONG TERM...  (Thursday through Next Tuesday)
Issued at 437 PM CDT Tue May 21 2019

The extended part of the forecast will be highlighted by warm
temperatures and a chance of thunderstorms through the Memorial
Day weekend. The GEFS and deterministic models are in reasonable
agreement into early next week that east-west front set up
underneath quasi-zonal upper flow. This will be between a large
upper high over the southeastern CONUS and trough over the
southwest. Coverage of thunderstorms over our area will be
determined by the ultimate location of the front and how much
upper ridging will be over the CWA. For now will keep with above
normal temperatures given forecast 850mb temperatures between
15-20C and a persistent chance of thunderstorms.

Britt

&&

.AVIATION...  (For the 00z TAFs through 00z Wednesday Evening)
Issued at 641 PM CDT Tue May 21 2019

A line of thunderstorms will continue to affect the St. Louis area
terminals through 01Z before moving into Illinois. There will be a
threat for gusts up to 50KTS, hail, and isolated tornadoes at
KCPS.  There will also be MVFR/IFR ceilings and visibilities with
it. MVFR visibilities and ceilings will also occur at KUIN and
KCOU before moving out later this evening. Then dry and VFR
conditions are expected at all of the terminals by 06Z.

SPECIFICS FOR KSTL:

Thunderstorms will move east of the terminal by 01Z. Dry and VFR
conditions expected by 06Z. Southerly winds will gust to around
20KTS at times trough the end of the period.

Britt

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Flash Flood Watch until midnight CDT tonight for Audrain MO-
     Boone MO-Callaway MO-Cole MO-Crawford MO-Franklin MO-
     Gasconade MO-Iron MO-Jefferson MO-Knox MO-Lewis MO-Lincoln
     MO-Madison MO-Marion MO-Moniteau MO-Monroe MO-Montgomery MO-
     Osage MO-Pike MO-Ralls MO-Reynolds MO-Saint Charles MO-
     Saint Francois MO-Saint Louis City MO-Saint Louis MO-Sainte
     Genevieve MO-Shelby MO-Warren MO-Washington MO.

IL...Flash Flood Watch until midnight CDT tonight for Adams IL-Bond
     IL-Brown IL-Calhoun IL-Clinton IL-Fayette IL-Greene IL-
     Jersey IL-Macoupin IL-Madison IL-Marion IL-Monroe IL-
     Montgomery IL-Pike IL-Randolph IL-Saint Clair IL-Washington
     IL.

&&

WFO LSX

Hazardous weather outlook, May 21, 3:58 PM CDT, 3 hours 58 minutes before

Hazardous Weather Outlook
National Weather Service Saint Louis MO
358 PM CDT Tue May 21 2019

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-222100-
Adams IL-Audrain MO-Bond IL-Boone MO-Brown IL-Calhoun IL-Callaway MO-
Clinton IL-Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO-
Greene IL-Iron MO-Jefferson MO-Jersey IL-Knox MO-Lewis MO-Lincoln MO-
Macoupin IL-Madison IL-Madison MO-Marion IL-Marion MO-Moniteau MO-
Monroe IL-Monroe MO-Montgomery IL-Montgomery MO-Osage MO-Pike IL-
Pike MO-Ralls MO-Randolph IL-Reynolds MO-Saint Charles MO-
Saint Clair IL-Saint Francois MO-Saint Louis City MO-Saint Louis MO-
Sainte Genevieve MO-Shelby MO-Warren MO-Washington IL-Washington MO-
358 PM CDT Tue May 21 2019

This Hazardous Weather Outlook is for portions of eastern and
central Missouri as well as west central and southwest Illinois.

.DAY ONE...Tonight.

Severe thunderstorms are likely this evening. Damaging wind is the
primary threat, with isolated tornadoes and large hail also
possible.

A flash flood watch is in effect until midnight tonight. Locally
heavy rain from last night combined with expected heavy rain from
thunderstorms this evening may produce dangerous flash flooding.

Major river flooding is ongoing along portions of the Illinois
River.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Major river flooding is expected over the next week along the
Mississippi, Missouri, and Illinois Rivers. Crests at some locations
will be close to or greater than what were seen earlier this year.

The chance for thunderstorms will continue from Wednesday night
through Monday across parts of our area. A few strong to severe
storms are possible Wednesday night into Thursday over central and
northeast Missouri into west central Illinois.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed this evening across much of
the area.

Britt

In the hours before

Local storm report, May 21, 6:55 PM CDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
655 PM CDT TUE MAY 21 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0650 PM     FUNNEL CLOUD     1 SSW BRIDGETON         38.75N 90.44W
05/21/2019                   ST. LOUIS          MO   TRAINED SPOTTER

&&

SALLY

Local storm report, May 21, 7:17 PM CDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
717 PM CDT TUE MAY 21 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0715 PM     FUNNEL CLOUD     ALTON                   38.90N 90.15W
05/21/2019                   MADISON            IL   TRAINED SPOTTER

            TRAINED STORM SPOTTER REPORTED A LOW HANGING
            FUNNEL CLOUD WHEN LOOKING WEST.

&&

MRM

Local storm report, May 21, 7:24 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
724 PM CDT TUE MAY 21 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0720 PM     FUNNEL CLOUD     2 SE ALTON              38.89N 90.12W
05/21/2019                   MADISON            IL   TRAINED SPOTTER

&&

MRM

Local storm report, May 21, 7:33 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
733 PM CDT TUE MAY 21 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0733 PM     HAIL             AMES                    38.15N 90.06W
05/21/2019  E0.70 INCH       MONROE             IL   PUBLIC

&&

SALLY

Local storm report, May 21, 7:45 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
745 PM CDT TUE MAY 21 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0740 PM     HAIL             CASEYVILLE              38.64N 90.03W
05/21/2019  E0.25 INCH       ST. CLAIR          IL   TRAINED SPOTTER

&&

SALLY

Local storm report, May 21, 7:50 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
750 PM CDT TUE MAY 21 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0748 PM     FLASH FLOOD      GRANITE CITY            38.72N 90.13W
05/21/2019                   MADISON            IL   TRAINED SPOTTER

            ESTIMATED 7-8 INCHES OF WATER IN ROAD AT
            25TH STREET AND EDWARDSVILLE ROAD. WATER UP
            TO MID TIRE AT WALNUT ST AND NIEDRINGHAUS
            AVE.

&&

MRM

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 7:08 PM CDT	Tornado Warning	LSX	Madison, Saint Clair	37 min
May 21, 7:36 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Macoupin, Madison, Montgomery	39 min
May 21, 7:46 PM CDT	Tornado Warning	LSX	Bond, Madison	29 min
May 21, 8:08 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Montgomery	52 min
May 21, 8:27 PM CDT	Tornado Warning	LSX	Bond, Clinton, Fayette, Marion	21 min
May 21, 8:45 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Fayette, Marion, Montgomery	45 min
May 22, 9:36 AM CDT	River Flood Warning	LSX	Brown	14 days
May 22, 9:52 AM CDT	River Flood Warning	LSX	Fayette	4 days
May 22, 1:53 PM CDT	Flash Flood Watch	LSX	Adams	14 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2019 Every severe thunderstorm warning in 2019

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.