Alert archive / Illinois / Special Weather Statements in 2017

Special Weather Statement, NWS Lincoln, IL

August 2, 201719 counties in Illinois

NWS Lincoln, IL issued this special weather statement at Aug 2, 2017, 4:13 PM CDT for 19 counties in Illinois. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 2, 2017, 4:13 PM CDT (21:13 UTC)
Expired
Aug 2, 2017, 6:15 PM CDT
In force
2 hr
Issued by
NWS Lincoln, IL

Counties Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Logan County, IL, Macon County, IL, Mason County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.2 hours before the alert went out and 114 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2017-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2017-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
53 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
1165 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

407 
WWUS83 KILX 022113
SPSILX

Special Weather Statement
National Weather Service Lincoln IL
413 PM CDT WED AUG 2 2017

ILZ036-038-040>057-061-063-022315-
Sangamon-Scott-Mason-Macon-Morgan-Vermilion-Clark-Christian-McLean-
Schuyler-Edgar-Logan-Douglas-Coles-Piatt-Menard-De
Witt-Moultrie-Shelby-Champaign-Cass-Fulton-
413 PM CDT WED AUG 2 2017

...FUNNEL CLOUDS SIGHTED NEAR CHAMPAIGN...

At 4:10 pm, a funnel cloud was reported near Willard Airport outside 
of Champaign. Earlier in the afternoon, another was reported north 
of the Decatur airport.

Atmospheric conditions exist across the area today that favor the 
possible formation of weak circulations. Some of these circulations 
are occurring underneath developing showers and thunderstorms, where 
a funnel cloud may develop. Once the rain begins, the funnel cloud 
dissipates.

Low hanging clouds can also appear to dip up and down at times, but
they will not show signs of any rapid rotation. An actual funnel
cloud will exhibit spinning in a counter clockwise direction.

In rare instances, these funnels may briefly touch down. Stay alert,
and be prepared to move to a safe shelter, if a funnel cloud
approaches the ground.

LAT...LON 4028 9091 4027 9045 4042 9044 4043 8972
      4032 8971 4032 8927 4043 8926 4041 8753
      3937 8753 3938 8953 3952 8954 3952 9058
      3971 9065 3997 9051 3998 9060 4011 9071
      4011 9091
$$

Geelhart

Nearby

Special Weather Statements in Illinois, 2017Every special weather statement 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; the sounding from the Mesonet's radiosonde archive.