Alert archive / Illinois / Tornado Warnings in 2018

Tornado Warning 13, NWS St. Louis, MO

July 29, 2018Randolph County, Illinois

NWS St. Louis, MO issued this tornado warning at Jul 29, 2018, 5:05 PM CDT for Randolph County, Illinois. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 29, 2018, 5:05 PM CDT (22:05 UTC)
Expired: Jul 29, 2018, 5:30 PM CDT
In force: 25 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Randolph County, IL

The radar

The St Louis radar (KLSX), 114 km from the middle of the area, began a volume at 22:08 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.1 hours before the alert went out and 250 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: 990 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

823 
WFUS53 KLSX 292205
TORLSX
ILC157-292230-
/O.NEW.KLSX.TO.W.0013.180729T2205Z-180729T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
505 PM CDT SUN JUL 29 2018

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  East central Randolph County in southwestern Illinois...

* Until 530 PM CDT.
    
* At 505 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Steeleville, moving east at 10 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...
  Steeleville around 520 PM CDT.
  Percy around 530 PM CDT.

Other locations impacted by this tornadic thunderstorm include Blair
and Eden.

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 3797 8960 3799 8977 3809 8981 3816 8959
      3815 8959
TIME...MOT...LOC 2205Z 255DEG 11KT 3805 8972 

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

$$

BSH

2 follow-up statements

837 
WWUS53 KLSX 292220
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
520 PM CDT SUN JUL 29 2018

ILC157-292230-
/O.CON.KLSX.TO.W.0013.000000T0000Z-180729T2230Z/
Randolph IL-
520 PM CDT SUN JUL 29 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR EAST
CENTRAL RANDOLPH COUNTY...
    
At 519 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Steeleville, moving east at 15 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...
  Percy around 530 PM CDT.

Other locations impacted by this tornadic thunderstorm include Eden.

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 3799 8960 3801 8970 3811 8975 3811 8974
      3815 8959
TIME...MOT...LOC 2219Z 265DEG 13KT 3804 8966 

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

$$

BSH

641 
WWUS53 KLSX 292228
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
528 PM CDT SUN JUL 29 2018

ILC157-292237-
/O.EXP.KLSX.TO.W.0013.000000T0000Z-180729T2230Z/
Randolph IL-
528 PM CDT SUN JUL 29 2018

...THE TORNADO WARNING FOR EAST CENTRAL RANDOLPH COUNTY WILL EXPIRE
AT 530 PM CDT...
        
The storm which prompted the warning has weakened and is exiting the 
warned area. Therefore, the warning will be allowed to expire.

LAT...LON 3799 8960 3801 8970 3811 8975 3811 8974
      3815 8959
TIME...MOT...LOC 2227Z 255DEG 11KT 3805 8963 

$$

BSH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 10:30 AM CDT	Special Weather Statement	LSX	Montgomery	60 min
Jul 29, 3:25 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	50 min
Jul 29, 4:24 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	51 min
Jul 29, 5:15 PM CDT	Flash Flood Warning	LSX	Randolph	3 hr

Nearby

Tornado Warnings in Illinois, 2018 Every tornado warning in 2018 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.