Alert archive / Illinois / Tornado Warnings in 2017

Tornado Warning 14, NWS St. Louis, MO

March 7, 2017Fayette County, Montgomery County, Illinois

NWS St. Louis, MO issued this tornado warning at Mar 7, 2017, 1:11 AM CST for Fayette County, Montgomery County, Illinois. It was in force for 21 min. 4 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: Mar 7, 2017, 1:11 AM CST (07:11 UTC)
Expired: Mar 7, 2017, 1:32 AM CST
In force: 21 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Fayette County, IL, Montgomery County, IL

The radar

The Lincoln radar (KILX), 105 km from the middle of the area, began a volume at 07:13 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
Mar 7, 1:17 AM CST	TORNADO	2 S Witt, IL	AT LEAST 3 GRAIN BINS MOVED OFF THEIR FOUNDATIONS. ONE WAS THROWN MORE THAN 100 YARDS WHILE ANOTHER WAS BLOWN 50 YARDS. ALSO... 3 TO 4 SHEDS WERE UNROOFED. TIME ESTIMATED FROM RADAR.
Mar 7, 1:20 AM CST	TORNADO	Witt, IL	GRAIN BIN MOVED OFF FOUNDATION
Mar 7, 1:20 AM CST	TORNADO	Witt, IL	GRAIN BIN MOVED OFF FOUNDATION AS WELL AS TREES SNAPPED OR UPROOTED
Mar 7, 1:27 AM CST	HAIL 0.7	Coffeen, 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
Mar 6, 8:52 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 7.2 hours before the alert went out and 117 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: 4 J/kg
Mixed-layer CIN: -285 J/kg
Mixed-layer LCL: 651 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 475 m²/s²
0-3 km storm-relative helicity: 484 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

835 
WFUS53 KLSX 070711
TORLSX
ILC051-135-070745-
/O.NEW.KLSX.TO.W.0014.170307T0711Z-170307T0745Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
111 AM CST TUE MAR 7 2017

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Northwestern Fayette County in south central Illinois...
  Central Montgomery County in south central Illinois...

* Until 145 AM CST.

* At 110 AM CST, a severe thunderstorm capable of producing a tornado
  was located over Schram City, moving east at 60 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...
  Nokomis and Witt around 120 AM CST. 
  Ramsey around 125 AM CST. 

Other locations impacted by this tornadic thunderstorm include
Chapman, Herrick, Coalton, Fillmore, Irving, Butler and Wenonah.

This also includes  Ramsey Lake State Park.
 
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 3906 8951 3923 8958 3935 8920 3935 8914
      3922 8914 3922 8881 3920 8880
TIME...MOT...LOC 0710Z 252DEG 54KT 3917 8946 

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

$$

Britt

2 follow-up statements

068 
WWUS53 KLSX 070726
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
126 AM CST TUE MAR 7 2017

ILC051-135-070745-
/O.CON.KLSX.TO.W.0014.000000T0000Z-170307T0745Z/
Fayette IL-Montgomery IL-
126 AM CST TUE MAR 7 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 AM CST FOR
NORTHWESTERN FAYETTE AND EAST CENTRAL MONTGOMERY COUNTIES...
    
At 126 AM CST, a severe thunderstorm capable of producing a tornado
was located near Nokomis, moving east at 65 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 tornadic thunderstorm will remain over mainly rural areas of
northwestern Fayette and east central Montgomery Counties, including
the following locations: Coalton, Herrick and Wenonah.

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 3917 8933 3929 8938 3935 8920 3935 8914
      3922 8914 3922 8881 3920 8880
TIME...MOT...LOC 0726Z 248DEG 58KT 3928 8916 

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

$$

Britt

885 
WWUS53 KLSX 070732
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
132 AM CST TUE MAR 7 2017

ILC051-135-070741-
/O.CAN.KLSX.TO.W.0014.000000T0000Z-170307T0745Z/
Fayette IL-Montgomery IL-
132 AM CST TUE MAR 7 2017

...THE TORNADO WARNING FOR NORTHWESTERN FAYETTE AND EAST CENTRAL
MONTGOMERY COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

A tornado watch remains in effect until 400 AM CST for south central
Illinois.

LAT...LON 3917 8933 3929 8938 3935 8920 3935 8914
      3922 8914 3922 8881 3920 8880
TIME...MOT...LOC 0731Z 252DEG 54KT 3931 8905 

$$

Britt

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 6, 10:20 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	55 min
Mar 6, 10:22 PM CST	Tornado Warning Tornado observed	LSX	Adams, Brown	30 min
Mar 6, 10:55 PM CST	Severe Thunderstorm Warning	LSX	Pike	50 min
Mar 7, 12:08 AM CST	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Macoupin, Madison, Montgomery	52 min
Mar 7, 12:48 AM CST	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	57 min
Mar 7, 12:55 AM CST	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	39 min
Mar 7, 1:35 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Marion, Randolph, Saint Clair, Washington	43 min
Mar 7, 4:00 AM CST	Red Flag Warning	LSX	Adams, Brown, Calhoun, Greene, Jersey, Pike	15 hr

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.