Alert archive / Illinois / Special Weather Statements in 2017

Special Weather Statement, NWS Chicago, IL

April 16, 20174 counties in Illinois

NWS Chicago, IL issued this special weather statement at Apr 16, 2017, 2:08 AM CDT for 4 counties in Illinois. It was in force for 52 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: Apr 16, 2017, 2:08 AM CDT (07:08 UTC)
Expired: Apr 16, 2017, 3:00 AM CDT
In force: 52 min
Issued by: NWS Chicago, IL

Counties Ford County, IL, Iroquois County, IL, Kankakee County, IL, Livingston County, IL

The radar

The Chicago radar (KLOT), 99 km from the middle of the area, began a volume at 07:07 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 00:00Z, 7.1 hours before the alert went out and 69 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: 2273 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 281 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

376 
WWUS83 KLOT 160708
SPSLOT

Special Weather Statement
National Weather Service Chicago/Romeoville Il
208 AM CDT SUN APR 16 2017
 
ILZ023-032-033-039-160800-
Livingston IL-Kankakee IL-Iroquois IL-Ford IL-
208 AM CDT SUN APR 16 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN LIVINGSTON...KANKAKEE...
FORD AND IROQUOIS COUNTIES UNTIL 300 AM CDT...

At 208 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Manteno to El Paso. Movement was east at
50 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Kankakee, Bourbonnais, Bradley, Pontiac, Watseka, Fairbury, Gibson
City, Momence, Piper City, Gilman, Herscher, Clifton, Gridley,
Onarga, Grant Park, St. Anne, Forrest, Chatsworth, Chebanse and
Ashkum.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4040 8846 4062 8846 4062 8857 4076 8858
      4075 8893 4078 8893 4125 8778 4129 8753
      4081 8753 4040 8824
TIME...MOT...LOC 0708Z 286DEG 42KT 4121 8781 4073 8899 

$$

ENDERLEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 7:57 PM CDT	Special Weather Statement	LOT	Ogle	48 min
Apr 15, 8:21 PM CDT	Special Weather Statement	LOT	Winnebago	39 min
Apr 15, 9:04 PM CDT	Areal Flood Advisory	LOT	Boone, Ogle, Winnebago	3 hr
Apr 15, 10:28 PM CDT	Marine Dense Fog Advisory	LOT		5 hr
Apr 15, 10:35 PM CDT	Special Weather Statement	LOT	Winnebago	40 min
Apr 15, 11:17 PM CDT	Special Weather Statement	LOT	Boone, McHenry	43 min
Apr 15, 11:46 PM CDT	Special Marine Warning	LOT		89 min
Apr 15, 11:58 PM CDT	Areal Flood Advisory	LOT	Boone, DeKalb, Lee, McHenry, Ogle, Winnebago	6 hr
Apr 16, 1:17 AM CDT	Special Weather Statement	LOT	LaSalle	43 min
Apr 16, 9:31 AM CDT	River Flood Advisory	LOT	Boone	51 hr
Apr 16, 9:31 AM CDT	River Flood Advisory	LOT	Ogle	5 days
Apr 16, 10:16 AM CDT	River Flood Warning	LOT	Lake	51 hr
Apr 16, 10:26 AM CDT	River Flood Advisory	LOT	Lake	5 days
Apr 16, 10:31 AM CDT	River Flood Advisory	LOT	Kane, McHenry	6 days
Apr 16, 3:16 PM CDT	River Flood Advisory	LOT	Lake	69 hr

Nearby

Special Weather Statements in Illinois, 2017 Every 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; radar from the NEXRAD Level II archive.