Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 39, NWS Chicago, IL

July 15, 2021Ford County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jul 15, 2021, 5:12 PM CDT for Ford County, Illinois. It was in force for 35 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: Jul 15, 2021, 5:12 PM CDT (22:12 UTC)
Expired: Jul 15, 2021, 5:47 PM CDT
In force: 35 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Ford County, IL

The radar

The Lincoln radar (KILX), 100 km from the middle of the area, began a volume at 22:13 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
Jul 15, 5:22 PM CDT	HAIL 1.75	4 Ssw Elliott, IL	PHOTO OF GOLF BALL SIZE HAIL SHARED ON SOCIAL MEDIA. TIME ESTIMATED.

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, 10.2 hours before the alert went out and 46 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: 628 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1096 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted.

892 
WUUS53 KLOT 152212
SVRLOT
ILC053-152300-
/O.NEW.KLOT.SV.W.0039.210715T2212Z-210715T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Chicago/Romeoville
512 PM CDT Thu Jul 15 2021

The National Weather Service in Chicago has issued a

* Severe Thunderstorm Warning for...
  Southwestern Ford County in east central Illinois...

* Until 600 PM CDT.

* At 511 PM CDT, a severe thunderstorm was located near Gibson City,
  moving east at 25 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Paxton, Gibson City and Elliott. 

Including the following interstate...
 I-57 between mile markers 258 and 263.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4045 8845 4054 8812 4049 8812 4049 8803
      4040 8802 4040 8845
TIME...MOT...LOC 2211Z 260DEG 23KT 4041 8835 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

RATZER

2 follow-up statements

215 
WWUS53 KLOT 152231
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
531 PM CDT Thu Jul 15 2021

ILC053-152300-
/O.CON.KLOT.SV.W.0039.000000T0000Z-210715T2300Z/
Ford IL-
531 PM CDT Thu Jul 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR SOUTHWESTERN FORD COUNTY...

At 529 PM CDT, a severe thunderstorm was located near Paxton, moving 
east at 25 mph. 

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Paxton, Gibson City and Elliott. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4045 8845 4054 8812 4049 8812 4049 8803
      4040 8802 4040 8845
TIME...MOT...LOC 2229Z 260DEG 23KT 4043 8820 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

RATZER

251 
WWUS53 KLOT 152247
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
547 PM CDT Thu Jul 15 2021

ILC053-152256-
/O.CAN.KLOT.SV.W.0039.000000T0000Z-210715T2300Z/
Ford IL-
547 PM CDT Thu Jul 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN FORD COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 4045 8845 4054 8812 4049 8812 4049 8803
      4040 8802 4040 8845
TIME...MOT...LOC 2244Z 260DEG 23KT 4045 8805 

$$

RATZER

The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 15, 12:08 AM CDT	Severe Thunderstorm Warning	LOT	Ogle, Winnebago	52 min
Jul 15, 12:39 AM CDT	Special Weather Statement	LOT	Lee	51 min
Jul 15, 12:47 AM CDT	Severe Thunderstorm Warning	LOT	Boone, Winnebago	43 min
Jul 15, 1:01 AM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Ogle	33 min
Jul 15, 5:46 PM CDT	Special Weather Statement	LOT	Ford	59 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2021 Every severe thunderstorm warning in 2021

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.