Alert archive / Illinois / Tornado Warnings in 2017

Tornado Warning 17, NWS St. Louis, MO

April 29, 2017Jersey County, Macoupin County, Madison County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 29, 2017, 3:56 PM CDT for Jersey County, Macoupin County, Madison County, Illinois. It was in force for 16 min. 3 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: Apr 29, 2017, 3:56 PM CDT (20:56 UTC)
Expired: Apr 29, 2017, 4:12 PM CDT
In force: 16 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Jersey County, IL, Macoupin County, IL, Madison County, IL

The radar

The St Louis radar (KLSX), 56 km from the middle of the area, began a volume at 20:57 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
Apr 29, 4:02 PM CDT	TORNADO	2 W Miles Station, IL	A WEAK TORNADO CAUSED DAMAGE TO TREES AND THREE RESIDENCES NEAR THE JERSEY/MACOUPIN COUNTY BORDER. THE DAMAGE WAS RATED EF1 WITH MAXIMUM WINDS OF 90 MPH AND A WIDTH OF 50 YARDS.
Apr 29, 4:08 PM CDT	TSTM WND DMG	2 W Miles Station, IL	NUMEROUS TREE LIMBS DOWN AND A FEW TREES TWISTED AND BROKEN. POSSIBLE TORNADO.
Apr 29, 4:08 PM CDT	TSTM WND DMG	Brighton, IL	TREES/POWER LINES DOWN IN BRIGHTON AND MEDORA AREA.

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 12:00Z, 8.9 hours before the alert went out and 185 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: 776 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 568 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

798 
WFUS53 KLSX 292056
TORLSX
ILC083-117-119-292130-
/O.NEW.KLSX.TO.W.0017.170429T2056Z-170429T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
356 PM CDT SAT APR 29 2017

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northwestern Madison County in southwestern Illinois...
  Southwestern Macoupin County in southwestern Illinois...
  Southeastern Jersey County in southwestern Illinois...

* Until 430 PM CDT.

* At 356 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Godfrey, moving northeast at 35 mph.

  HAZARD...Tornado and quarter size hail. 

  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...
  Brighton around 410 PM CDT. 
  Shipman around 420 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Miles
Station, Piasa and Delhi.

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 3894 9027 3898 9032 3920 9010 3906 9001
TIME...MOT...LOC 2056Z 219DEG 31KT 3899 9026 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CVKING

2 follow-up statements

299 
WWUS53 KLSX 292108
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
408 PM CDT SAT APR 29 2017

ILC119-292117-
/O.CAN.KLSX.TO.W.0017.000000T0000Z-170429T2130Z/
Madison IL-
408 PM CDT SAT APR 29 2017

...THE TORNADO WARNING FOR NORTHWESTERN MADISON COUNTY IN
SOUTHWESTERN ILLINOIS IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 1000 PM CDT for
southwestern Illinois.

LAT...LON 3901 9019 3906 9024 3920 9010 3911 9004
TIME...MOT...LOC 2107Z 221DEG 27KT 3907 9017 

$$

ILC083-117-292130-
/O.CON.KLSX.TO.W.0017.000000T0000Z-170429T2130Z/
Macoupin IL-Jersey IL-
408 PM CDT SAT APR 29 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR
SOUTHWESTERN MACOUPIN AND EAST CENTRAL JERSEY COUNTIES...
    
At 407 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Brighton, moving northeast at 30 mph.

HAZARD...Tornado and quarter size hail. 

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...
  Shipman around 420 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Miles
Station and Piasa.

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 3901 9019 3906 9024 3920 9010 3911 9004
TIME...MOT...LOC 2107Z 221DEG 27KT 3907 9017 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CVKING

563 
WWUS53 KLSX 292112
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
412 PM CDT SAT APR 29 2017

ILC083-117-292121-
/O.CAN.KLSX.TO.W.0017.000000T0000Z-170429T2130Z/
Macoupin IL-Jersey IL-
412 PM CDT SAT APR 29 2017

...THE TORNADO WARNING FOR SOUTHWESTERN MACOUPIN AND EAST CENTRAL
JERSEY COUNTIES IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.  However
small hail, gusty winds and heavy rain are still possible with this
thunderstorm.

A severe thunderstorm watch remains in effect until 1000 PM CDT for
southwestern Illinois.

LAT...LON 3901 9019 3906 9024 3920 9010 3911 9004
TIME...MOT...LOC 2109Z 219DEG 31KT 3910 9014 

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 9:14 PM CDT	River Flood Warning	LSX	Fayette	10 days
Apr 28, 9:36 PM CDT	River Flood Warning	LSX	Brown	36 days
Apr 28, 9:36 PM CDT	River Flood Warning	LSX	Morgan, Pike	36 days
Apr 28, 9:36 PM CDT	River Flood Warning	LSX	Pike, Scott	40 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Adams	20 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Adams	19 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Adams	10 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Pike	20 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Calhoun	43 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Madison	40 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Saint Clair	16 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Jackson, Randolph	43 days
Apr 29, 12:41 AM CDT	Severe Thunderstorm Warning	LSX	Randolph	49 min
Apr 29, 3:53 AM CDT	Flash Flood Warning	LSX	Randolph	22 hr
Apr 29, 9:58 AM CDT	Special Weather Statement	LSX	Bond	47 min
Apr 29, 2:53 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	52 min
Apr 29, 3:08 PM CDT	Flash Flood Warning	LSX	Adams, Calhoun, Pike	8 hr
Apr 29, 3:24 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Macoupin, Madison	51 min
Apr 29, 4:03 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison, Montgomery	42 min
Apr 29, 4:42 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	48 min
Apr 29, 5:16 PM CDT	River Flood Warning	LSX	Brown	7 days
Apr 29, 5:20 PM CDT	Flash Flood Warning	LSX	Calhoun, Greene, Jersey, Macoupin, Montgomery	8 hr
Apr 29, 5:29 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Marion, Montgomery	61 min

Nearby

Tornado Warnings in Illinois, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.