Alert archive / Illinois / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 95, NWS Lincoln, IL

June 28, 20185 counties in Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 28, 2018, 4:18 PM CDT for 5 counties in Illinois. It was in force for 42 min. 7 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: Jun 28, 2018, 4:18 PM CDT (21:18 UTC)
Expired: Jun 28, 2018, 5:00 PM CDT
In force: 42 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Logan County, IL, Mason County, IL, Menard County, IL, Sangamon County, IL, Tazewell County, IL

The radar

The Lincoln radar (KILX), 38 km from the middle of the area, began a volume at 21:21 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
Jun 28, 4:30 PM CDT	TSTM WND DMG	Mason City, IL	TREES AND POWER LINES DOWN
Jun 28, 4:39 PM CDT	TSTM WND DMG	4 Wsw Springfield, IL	4 INCH TREE LIMB DOWN ON THE 700 BLOCK OF SHOSHONI DR.
Jun 28, 4:40 PM CDT	TSTM WND DMG	Springfield, IL	LIMBS DOWN
Jun 28, 4:41 PM CDT	TSTM WND DMG	Chatham, IL	POWER LINE DOWN ON 400 BLOCK OF MAIN STREET
Jun 28, 4:42 PM CDT	TSTM WND DMG	Auburn, IL	18 INCH DIAMETER TREE UPROOTED ALONG WITH NUMEROUS TREE LIMBS DOWN IN AUBURN
Jun 28, 4:50 PM CDT	TSTM WND DMG	Divernon, IL	TREE DOWN AND MULTIPLE TREE LIMBS DOWN. TIME ESTIMATED BY RADAR.
Jun 28, 4:59 PM CDT	TSTM WND DMG	Lincoln, IL	6 INCH TREE LIMB DOWN ON A CAR

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 8 storm reports to this severe thunderstorm warning; the first came 12 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
Jun 28, 1:04 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.3 hours before the alert went out and 96 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: 7 J/kg
Mixed-layer CIN: -572 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

503 
WUUS53 KILX 282118
SVRILX
ILC107-125-129-167-179-282200-
/O.NEW.KILX.SV.W.0095.180628T2118Z-180628T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lincoln IL
418 PM CDT THU JUN 28 2018

The National Weather Service in Lincoln has issued a

* Severe Thunderstorm Warning for...
  Menard County in central Illinois...
  Logan County in central Illinois...
  Sangamon County in central Illinois...
  Southeastern Tazewell County in central Illinois...
  Southeastern Mason County in central Illinois...

* Until 500 PM CDT

* At 418 PM CDT, severe thunderstorms were located along a line
  extending from Manito to Petersburg to near Alexander, moving east
  at 55 mph.

  HAZARD...70 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings. 

* Locations impacted include...
  Springfield, Lincoln, Mason City, Chatham, Auburn, Sherman,
  Rochester, Riverton, Petersburg, Athens, Atlanta, Delavan,
  Williamsville, New Berlin, Ashland, Divernon, Hopedale, Pleasant
  Plains, Greenview and Loami.

This includes the following highways...
 Interstate 155 between mile markers 0 and 18.
 Interstate 55 between mile markers 81 and 139.
 Interstate 72 between mile markers 80 and 110.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3993 8992 4048 8957 4034 8926 4029 8926
      4028 8921 3952 8968 3952 8992 3957 8993
      3972 8999 3990 9000
TIME...MOT...LOC 2118Z 285DEG 47KT 4041 8980 4002 8984 3976 9004 

HAIL...<.75IN
WIND...70MPH
 
$$

Goetsch

1 follow-up statement

663 
WWUS53 KILX 282159
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
459 PM CDT THU JUN 28 2018

ILC107-125-129-167-179-282209-
/O.EXP.KILX.SV.W.0095.000000T0000Z-180628T2200Z/
Menard-Logan-Sangamon-Tazewell-Mason-
459 PM CDT THU JUN 28 2018

...THE SEVERE THUNDERSTORM WARNING FOR MENARD...LOGAN...SANGAMON...
SOUTHEASTERN TAZEWELL AND SOUTHEASTERN MASON COUNTIES WILL EXPIRE AT
500 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 700 PM CDT for
central and west central Illinois.

LAT...LON 3993 8992 4048 8957 4034 8926 4029 8926
      4028 8921 3952 8968 3952 8992 3957 8993
      3972 8999 3990 9000
TIME...MOT...LOC 2159Z 285DEG 47KT 4028 8916 3989 8920 3963 8940 

$$

Goetsch

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 Lincoln, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 28, 3:28 PM CDT, 50 minutes earlier.

Area forecast discussion, Jun 28, 3:28 PM CDT, 50 minutes before

Area Forecast Discussion
National Weather Service Lincoln IL
328 PM CDT Thu Jun 28 2018

.SHORT TERM...(This evening through Friday)
ISSUED AT 328 PM CDT Thu Jun 28 2018

Convective complex currently pushing into west-central Illinois
will continue to track E/SE along a slowly advancing warm front
late this afternoon. 20z/3pm radar imagery shows the leading edge
of the storms along a Macomb to Quincy line...with a general E/SE
movement. Storms will turn more to the SE over the next hour or
two, following the primary instability gradient extending from
southeast Iowa to southeast Illinois. Have adjusted PoPs to
feature likely to categorical along/southwest of a Macomb...to
Springfield...to Shelbyville line through 23z/6pm accordingly.
Once the initial push of storms passes, rain showers will linger
behind the line for an hour or two before the precip comes to an
end. Elsewhere around central Illinois, am expecting a warm/dry
night with overnight lows in the lower to middle 70s.

As the warm front lifts northward, southerly winds will bring
increasingly humid air into central Illinois on Friday. With ample
sunshine heating the airmass into the lower to middle 90s and
surface dewpoints hovering in the lower to middle 70s...peak
afternoon heat index values will top out around 110 degrees. With
this oppressive heat expected to continue through at least
Saturday, decided to upgrade the Heat Advisory to an Excessive
Heat Warning for the entire KILX CWA for both Friday and Saturday.

&&

.LONG TERM...(Friday night through Thursday)
ISSUED AT 328 PM CDT Thu Jun 28 2018

Very hot and humid weather will continue through Saturday before
an approaching short-wave and its associated cold front brings
some relief by Sunday. Model consensus suggests showers and
thunderstorms will become more numerous Sunday afternoon...which
will keep high temperatures down a few degrees in the upper 80s
and lower 90s. Resulting heat index readings will still be quite
high from 100-105, but will be below warning criteria. The best
rain chances will push into the southeast CWA by Monday as the
front settles southward and stalls in the Ohio River Valley. After
that, the boundary will lift back northward...resulting in
hot/humid weather conditions with low chance PoPs through the
middle of next week.

&&

.AVIATION...(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 1244 PM CDT Thu Jun 28 2018

VFR conditions will prevail for the entire 18z TAF period. Will be
keeping an eye on a large cluster of thunderstorms currently
ongoing across south-central Iowa. These storms will drop E/SE
along the Mississippi River later this afternoon...likely
remaining west of the central Illinois terminals. Winds will be SE
at 5-10kt this afternoon, then will veer to S at 8-12kt by Friday
morning.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
Excessive Heat Warning from 10 AM Friday to 8 PM CDT Saturday
for ILZ027>031-036>038-040>057-061>063-066>068-071>073.

&&

SHORT TERM...Barnes
LONG TERM...Barnes
AVIATION...Barnes

Hazardous weather outlook, Jun 28, 3:22 PM CDT, 56 minutes before

Hazardous Weather Outlook
National Weather Service Lincoln IL
322 PM CDT Thu Jun 28 2018

ILZ027>031-037-291100-
Knox-Marshall-Peoria-Stark-Tazewell-Woodford-
322 PM CDT Thu Jun 28 2018

...EXCESSIVE HEAT WARNING IN EFFECT FROM 10 AM FRIDAY TO 8 PM CDT
SATURDAY...

This Hazardous Weather Outlook is for portions of central
Illinois and west central Illinois.

.DAY ONE...TONIGHT...

Isolated thunderstorms will be possible into this evening. Any
thunderstorm that develops across the area has the potential for
producing gusty winds, torrential rainfall and frequent lightning.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

Minor flooding will occur over portions of the Illinois River from
Peoria and downstream the next several days.

There is a chance of thunderstorms Sunday and Sunday evening.

A heat wave is expected from Friday through Saturday. High
temperatures are forecast to be in the mid 90s, with afternoon
heat indices peaking from 108 to 113 degrees.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated through tonight.

ILZ036-040-047-049-050-291100-
Cass-Fulton-Morgan-Schuyler-Scott-
322 PM CDT Thu Jun 28 2018

...EXCESSIVE HEAT WARNING IN EFFECT FROM 10 AM FRIDAY TO 8 PM CDT
SATURDAY...

This Hazardous Weather Outlook is for portions of west central
Illinois.

.DAY ONE...TONIGHT...

Scattered thunderstorms will be possible into early this evening.
A few storms may produce damaging wind gusts and hail, along with
frequent lightning and brief heavy rainfall.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

Minor flooding will occur over portions of the Illinois River from
Peoria and downstream the next several days.

There is a chance of thunderstorms again Sunday and Sunday evening.

A heat wave is expected from Friday through Saturday. High
temperatures are forecast to be in the mid 90s, with afternoon
heat indices peaking from 108 to 113 degrees.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed through late this afternoon.

ILZ041-048-051-052-061-066>068-071>073-291100-
Christian-Clay-Crawford-Effingham-Jasper-Lawrence-Mason-Menard-
Richland-Sangamon-Shelby-
322 PM CDT Thu Jun 28 2018

...EXCESSIVE HEAT WARNING IN EFFECT FROM 10 AM FRIDAY TO 8 PM CDT
SATURDAY...

This Hazardous Weather Outlook is for portions of central
Illinois and southeast Illinois.

.DAY ONE...TONIGHT...

An isolated thunderstorm will be possible into early this evening.
Gusty winds, hail, frequent lightning and brief heavy rainfall
will accompany some of the stronger storms.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

Minor flooding will occur over portions of the Illinois River from
Peoria and downstream the next several days.

There is a chance of thunderstorms again Sunday and Sunday evening.

A heat wave is expected from Friday through Saturday. High
temperatures are forecast to be in the mid 90s, with afternoon
heat indices peaking from 108 to 113 degrees.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed late this afternoon.

ILZ038-042>046-053>057-062-063-291100-
Champaign-Clark-Coles-Cumberland-De Witt-Douglas-Edgar-Logan-
Macon-McLean-Moultrie-Piatt-Vermilion-
322 PM CDT Thu Jun 28 2018

...EXCESSIVE HEAT WARNING IN EFFECT FROM 10 AM FRIDAY TO 8 PM CDT
SATURDAY...

This Hazardous Weather Outlook is for portions of central
Illinois and east central Illinois.

.DAY ONE...TONIGHT...

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

There is a chance of thunderstorms Sunday and Sunday night.

A heat wave is expected from Friday through Saturday. High
temperatures are forecast to be in the mid 90s, with afternoon
heat indices peaking from 108 to 113 degrees.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated through tonight.

Smith

In the hours before

Local storm report, Jun 28, 3:56 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
356 PM CDT THU JUN 28 2018

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

0353 PM     TSTM WND GST     LEWISTOWN               40.40N 90.16W
06/28/2018  E60 MPH          FULTON             IL   EMERGENCY MNGR

            TREE LIMBS AND POWERLINES DOWN

&&

HIRIS

Local storm report, Jun 28, 4:03 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
403 PM CDT THU JUN 28 2018

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

0344 PM     TSTM WND GST     RUSHVILLE               40.12N 90.57W
06/28/2018  E60 MPH          SCHUYLER           IL   EMERGENCY MNGR

            NUMEROUS TREE LIMBS AND POWER LINES DOWN

&&

HIRIS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 2:52 PM CDT	Excessive Heat Warning	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 29 more	3 days
Jun 28, 3:06 PM CDT	Severe Thunderstorm Warning	ILX	Schuyler	54 min
Jun 28, 3:28 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Schuyler	62 min
Jun 28, 3:47 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Mason, Menard, Peoria, Tazewell	58 min
Jun 28, 3:57 PM CDT	Severe Thunderstorm Warning	ILX	Morgan, Scott	63 min
Jun 28, 4:44 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Logan, McLean, Macon, Sangamon	46 min
Jun 28, 5:14 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Macon, Moultrie, Shelby	46 min
Jun 28, 5:52 PM CDT	Severe Thunderstorm Warning	ILX	Effingham, Shelby	53 min
Jun 28, 6:13 PM CDT	Severe Thunderstorm Warning	ILX	Clay	62 min
Jun 28, 6:39 PM CDT	Severe Thunderstorm Warning	ILX	Richland	33 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2018 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.