Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 109, NWS Lincoln, IL

June 17, 2017Christian County, Morgan County, Sangamon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 17, 2017, 10:41 PM CDT for Christian County, Morgan County, Sangamon County, Illinois. It was in force for 64 min. 2 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 17, 2017, 10:41 PM CDT (03:41 UTC)
Expired: Jun 17, 2017, 11:45 PM CDT
In force: 64 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Christian County, IL, Morgan County, IL, Sangamon County, IL

The radar

The Lincoln radar (KILX), 52 km from the middle of the area, began a volume at 03:45 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 17, 10:52 PM CDT	TSTM WND DMG	6 Wsw Springfield, IL	POWERLINES BLOWN DOWN.
Jun 17, 10:59 PM CDT	TSTM WND DMG	5 S Springfield, IL	LARGE TREE LIMB SNAPPED OFF.

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 2 storm reports to this severe thunderstorm warning; the first came 11 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 17, 5:39 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.7 hours before the alert went out and 104 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: 606 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1403 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

As transmitted.

928 
WUUS53 KILX 180341
SVRILX
ILC021-137-167-180445-
/O.NEW.KILX.SV.W.0109.170618T0341Z-170618T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lincoln IL
1041 PM CDT SAT JUN 17 2017

The National Weather Service in Lincoln has issued a

* Severe Thunderstorm Warning for...
  Northwestern Christian County in central Illinois...
  Sangamon County in central Illinois...
  Northeastern Morgan County in west central Illinois...

* Until 1145 PM CDT

* At 1041 PM CDT, a severe thunderstorm was located near New Berlin,
  or 15 miles east of Jacksonville, moving east at 40 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...
  Springfield, Taylorville, Chatham, Alexander, Auburn, Sherman,
  Rochester, Riverton, Pawnee, Kincaid, New Berlin, Divernon,
  Edinburg, Illiopolis, Pleasant Plains, Loami, Mechanicsburg, Mount
  Auburn, Bulpitt and Jeisyville.

This includes the following highways...
 Interstate 55 between mile markers 80 and 104.
 Interstate 72 between mile markers 75 and 125.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3987 9005 3987 9000 3990 8999 3992 8922
      3983 8921 3951 8927 3964 9011
TIME...MOT...LOC 0341Z 279DEG 36KT 3979 8995 

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

Barnes

2 follow-up statements

773 
WWUS53 KILX 180428
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
1128 PM CDT SAT JUN 17 2017

ILC137-180436-
/O.CAN.KILX.SV.W.0109.000000T0000Z-170618T0445Z/
Morgan-
1128 PM CDT SAT JUN 17 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MORGAN COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 100 AM CDT for
central and west central Illinois. A severe thunderstorm watch also
remains in effect until 600 AM CDT for central Illinois.

LAT...LON 3978 8922 3951 8927 3961 8993 3962 8995
      3970 8998 3971 8998
TIME...MOT...LOC 0426Z 002DEG 11KT 3968 8970 

$$

ILC021-167-180445-
/O.CON.KILX.SV.W.0109.000000T0000Z-170618T0445Z/
Christian-Sangamon-
1128 PM CDT SAT JUN 17 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR NORTHWESTERN CHRISTIAN AND SOUTHERN SANGAMON COUNTIES...

At 1126 PM CDT, a severe thunderstorm was located over Chatham, or 7
miles south of Springfield, moving east-southeast at 40 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...
Springfield, Taylorville, Chatham, Auburn, Rochester, Pawnee,
Kincaid, Divernon, Edinburg, Loami, Mount Auburn, Bulpitt,
Jeisyville, Tovey, Berry, Sangchris Lake State Park, Glenarm,
Sharpsburg, Sicily and Roby.

This includes Interstate 55 between mile markers 80 and 91.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3978 8922 3951 8927 3961 8993 3962 8995
      3970 8998 3971 8998
TIME...MOT...LOC 0426Z 002DEG 11KT 3968 8970 

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

Barnes

205 
WWUS53 KILX 180443
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
1143 PM CDT SAT JUN 17 2017

ILC021-167-180453-
/O.EXP.KILX.SV.W.0109.000000T0000Z-170618T0445Z/
Christian-Sangamon-
1143 PM CDT SAT JUN 17 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CHRISTIAN AND
SOUTHERN SANGAMON COUNTIES WILL EXPIRE AT 1145 PM CDT...
                
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 will be allowed to expire.  However gusty winds
and heavy rain are still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 100 AM CDT for
central and west central Illinois. A severe thunderstorm watch also
remains in effect until 600 AM CDT for central Illinois.

LAT...LON 3978 8922 3951 8927 3961 8993 3962 8995
      3970 8998 3971 8998
TIME...MOT...LOC 0443Z 279DEG 36KT 3965 8949 

$$

Barnes

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 17, 8:53 PM CDT, 1 hour 48 minutes earlier.

Area forecast discussion, Jun 17, 8:53 PM CDT, 1 hour 48 minutes before

Area Forecast Discussion
National Weather Service Lincoln IL
853 PM CDT Sat Jun 17 2017

.UPDATE...
Issued at 853 PM CDT Sat Jun 17 2017

Clusters of strong/severe storms are expanding as a pair of MCS's
(one over northern Illinois and the other over Kansas/western
Missouri) start to converge. First cluster currently moving across
the northern CWA with another increasing across west central
Illinois. Areas south of I-70 will likely hold off on the
activity until midnight or later, but storms will continue to
march east-southeast across the remainder of the forecast area for
the next several hours.

General trends already in place with the gridded forecasts, but
will update the PoP trends to reflect the latest trends.

&&

.SHORT TERM...(This evening through Sunday)
ISSUED AT 233 PM CDT Sat Jun 17 2017

Cold front lingering to the NW this afternoon moving closer to the
region and will be driving tonights weather and into tomorrow.
Hot and muggy air in the boundary layer is in place over the
region. However, much of the anticipated convection is very
conditional on several elements. Surface based parcels with
dewpoints in the upper 60s/near 70 result in a significant CAPE
close to 2000 J/kg on the 18z special sounding at ILX. However, a
slight alteration to the sounding, mixing those dewpoints a
bit...if only to how dry it is at 50ft AGL, results in a major
loss of CAPE and a far more substantial cap. Shear is delayed with
the wave aloft and the boundary later tonight, as well as rather
bleak lapse rates that the models have had correctly all along.
Models are very split on timing and intensity...both prefrontal as
well as later tonight along the boundary. So much of this
afternoon/evening is highly contingent on a loss of the cap... or
something to turn the boundary layer over in the way of a small
outflow or the front itself. The window for surface based
convection this afternoon will be somewhat limited. That being
said, tonights pops will remain in the likely category as even
weak convergence at front should assist in showers and
thunderstorms, with potential for damaging winds and hail with the
more intense storms. SPC has maintained an Enhanced Risk for much
of Central IL tonight, even with the uncertainty.

Precip will likely run into tomorrow morning...slowly ending west
to east. Air behind the front is not that much cooler and
tomorrows highs are still expected in the upper 70s/lower 80s.

.LONG TERM...(Sunday night through Saturday)
ISSUED AT 233 PM CDT Sat Jun 17 2017

Beyond Sunday and behind the front, that slightly cooler/drier
airmass will keep Central IL in the upper 70s/lower 80s and
overnight lows in the upper 50s/lower 60s on Monday and Tuesday.
Wednesday the surface flow turns around to more southerly at the
surface in a zonal regime aloft...similar to the pattern of last
week...with occasional precip chances and warming temperatures
through the end of the week.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 646 PM CDT Sat Jun 17 2017

Convection has fired to the north and northwest this evening.
Timing some of the storms and anticipating for further development
at least through 06z in PIA SPI as well as a right moving trend
in the larger developing complexes, diving south into more
unstable air, if briefly. General use of VCTS throughout the night
in the rest of the sites as the weak front dives into the region.
Wind shift across the boundary is subtle to a more westerly... or
slightly north of westerly shift. Potential for lower cigs right
along and behind the boundary briefly towards dawn. Otherwise,
westerly winds and VFR tomorrow afternoon.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

UPDATE...Geelhart
SHORT TERM...HJS
LONG TERM...HJS
AVIATION...HJS

Hazardous weather outlook, Jun 17, 3:30 PM CDT, 7 hours 11 minutes before

Hazardous Weather Outlook
National Weather Service Lincoln IL
330 PM CDT Sat Jun 17 2017

ILZ027>031-036>038-040>043-047>051-180730-
Cass-De Witt-Fulton-Knox-Logan-Marshall-Mason-McLean-Menard-
Morgan-Peoria-Sangamon-Schuyler-Scott-Stark-Tazewell-Woodford-
330 PM CDT Sat Jun 17 2017

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

.DAY ONE...TONIGHT...

There is an Enhanced Risk for severe thunderstorms this evening.
Current indications suggest the primary time frame for severe
weather will be roughly from 6 pm through 10 pm. Damaging winds,
large hail, isolated tornadoes, along with heavy rainfall, will be
possible with the storms before they shift rapidly to the
southeast later this evening.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

The next chance for thunderstorms will be late Wednesday night
into Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed late this afternoon through this
evening. The primary time frame will be from 6 pm until 10 pm.

ILZ044>046-052>057-061-062-066-180730-
Champaign-Christian-Coles-Cumberland-Douglas-Edgar-Effingham-
Macon-Moultrie-Piatt-Shelby-Vermilion-
330 PM CDT Sat Jun 17 2017

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

.DAY ONE...TONIGHT...

There is an Enhanced Risk for severe thunderstorms this evening.
The primary time frame for severe weather will be roughly from
8 pm until Midnight. Damaging winds, large hail, isolated
tornadoes, along with heavy rainfall will be possible with the
storms before they shift rapidly to the southeast of the area
around Midnight.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

A few thunderstorms may linger into early Sunday morning near the
Interstate 70 corridor. None of these storms are expected to be
severe.

The next chance for thunderstorms will be late Wednesday into
Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed this evening. At this time it
appears the primary time frame would be from 8 pm until Midnight.

ILZ063-067-068-071>073-180730-
Clark-Clay-Crawford-Jasper-Lawrence-Richland-
330 PM CDT Sat Jun 17 2017

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

.DAY ONE...TONIGHT...

There is a Slight Risk for severe thunderstorms later tonight.
Current indications suggest the primary time frame for the strong
thunderstorms will be roughly from 10 pm through 2 am. Damaging
winds, large hail, along with heavy rainfall will be possible
with the storms.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

Scattered thunderstorms will be possible into early Sunday
afternoon over parts of southeast Illinois. No severe weather
is expected.

The next chance for thunderstorms over southeast Illinois will be
Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed tonight, roughly from 10 pm
through 2 am.

Bak

In the hours before

Local storm report, Jun 17, 10:05 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1005 PM CDT SAT JUN 17 2017

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

0945 PM     HEAVY RAIN       HENRY                   41.11N 89.36W
06/17/2017  M1.37 INCH       MARSHALL           IL   EMERGENCY MNGR

            RAIN FELL IN ABOUT ONE HOUR AND A HALF. QUITE A BIT OF
            STREET FLOODING.

&&

JRP

Local storm report, Jun 17, 10:12 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1012 PM CDT SAT JUN 17 2017

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

1000 PM     HEAVY RAIN       GERMANTOWN HILLS        40.77N 89.47W
06/17/2017  M3.24 INCH       WOODFORD           IL   PUBLIC

            RAIN FELL IN ONE AND ONE HALF HOURS.

&&

JRP

Local storm report, Jun 17, 10:21 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1021 PM CDT SAT JUN 17 2017

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

1017 PM     HEAVY RAIN       NORMAL                  40.52N 89.00W
06/17/2017  M1.36 INCH       MCLEAN             IL   EMERGENCY MNGR

            RAINFALL TOTAL SINCE 9 PM.

&&

JRP

Local storm report, Jun 17, 10:24 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1024 PM CDT SAT JUN 17 2017

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

1000 PM     HAIL             BEARDSTOWN              40.01N 90.43W
06/17/2017  M1.00 INCH       CASS               IL   TRAINED SPOTTER

&&

JRP

Local storm report, Jun 17, 10:27 PM CDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1027 PM CDT SAT JUN 17 2017

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

1020 PM     FLASH FLOOD      NORMAL                  40.52N 89.00W
06/17/2017                   MCLEAN             IL   EMERGENCY MNGR

            SEVERAL OCCUPIED VEHICLES STUCK IN FLOODED STREETS
            BETWEEN ILLINOIS STATE UNIVERSITY AND UPTOWN NORMAL.

&&

JRP

Local storm report, Jun 17, 10:35 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1035 PM CDT SAT JUN 17 2017

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

1030 PM     TSTM WND GST     POTOMAC                 40.31N 87.80W
06/17/2017  E60 MPH          VERMILION          IL   EMERGENCY MNGR

&&

JRP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 7:37 PM CDT	Severe Thunderstorm Warning	ILX	Marshall, Stark	53 min
Jun 17, 8:02 PM CDT	Severe Thunderstorm Warning	ILX	Marshall, Peoria, Tazewell, Woodford	43 min
Jun 17, 8:03 PM CDT	Flash Flood Warning	ILX	Stark	3 hr
Jun 17, 8:11 PM CDT	Flash Flood Warning	ILX	Marshall	3 hr
Jun 17, 8:40 PM CDT	Flash Flood Warning	ILX	Peoria, Tazewell, Woodford	3 hr
Jun 17, 8:54 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Woodford	51 min
Jun 17, 9:10 PM CDT	Flash Flood Warning	ILX	McLean	3 hr
Jun 17, 9:24 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Morgan, Schuyler	56 min
Jun 17, 10:06 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Morgan	39 min
Jun 17, 10:09 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Vermilion	52 min
Jun 17, 11:37 PM CDT	Areal Flood Warning	ILX	Peoria, Tazewell, Woodford	12 hr
Jun 17, 11:47 PM CDT	Flash Flood Warning	ILX	Christian, Sangamon	3 hr
Jun 17, 11:55 PM CDT	Areal Flood Warning	ILX	McLean	12 hr
Jun 18, 2:41 AM CDT	Special Weather Statement	ILX	Clay, Effingham	34 min
Jun 18, 3:03 AM CDT	Severe Thunderstorm Warning	ILX	Clay, Effingham, Jasper, Richland	42 min
Jun 18, 3:30 AM CDT	Severe Thunderstorm Warning	ILX	Crawford, Jasper, Lawrence, Richland	45 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2017 Every severe thunderstorm warning 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.