Alert archive / Illinois / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 21, NWS Chicago, IL

May 28, 2016LaSalle County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at May 28, 2016, 8:24 PM CDT for LaSalle County, Illinois. It was in force for 51 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: May 28, 2016, 8:24 PM CDT (01:24 UTC)
Expired: May 28, 2016, 9:15 PM CDT
In force: 51 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County LaSalle County, IL

The radar

The Chicago radar (KLOT), 84 km from the middle of the area, began a volume at 01:27 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

Davenport, (KDVN), launched 00:00Z, 1.4 hours before the alert went out and 128 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: 256 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1474 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

337 
WUUS53 KLOT 290124
SVRLOT
ILC099-290215-
/O.NEW.KLOT.SV.W.0021.160529T0124Z-160529T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
824 PM CDT SAT MAY 28 2016

THE NATIONAL WEATHER SERVICE IN CHICAGO  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN LA SALLE COUNTY IN NORTH CENTRAL ILLINOIS...

* UNTIL 915 PM CDT

* AT 824 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR TONICA...OR
  NEAR OGLESBY...MOVING NORTHEAST 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...
  OTTAWA...PERU...OGLESBY...LA SALLE...UTICA...NORTH UTICA...TONICA...GRAND
  RIDGE...NAPLATE...CEDAR POINT AND LEONORE.

INCLUDING THE FOLLOWING INTERSTATES...
 I-39 BETWEEN MILE MARKERS 46 AND 62.
 I-80 BETWEEN MILE MARKERS 77 AND 90.

THIS INCLUDES...  BUFFALO ROCK STATE PARK...ILLINOIS VALLEY COMMUNITY
COLLEGE...MATTHIESSEN STATE PARK...AND STARVED ROCK STATE PARK.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4151 8896 4125 8871 4115 8915 4119 8916
      4131 8916
TIME...MOT...LOC 0124Z 232DEG 24KT 4125 8911 

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

BMD

3 follow-up statements

835 
WWUS53 KLOT 290141
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
841 PM CDT SAT MAY 28 2016

ILC099-290215-
/O.CON.KLOT.SV.W.0021.000000T0000Z-160529T0215Z/
LA SALLE IL-
841 PM CDT SAT MAY 28 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR NORTHERN LA SALLE COUNTY...

AT 841 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR NAPLATE...OR
NEAR OTTAWA...MOVING NORTHEAST AT 30 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...
OTTAWA...PERU...OGLESBY...LA SALLE...UTICA...NORTH UTICA...TONICA...GRAND
RIDGE...NAPLATE...CEDAR POINT AND LEONORE.

THIS INCLUDES...  BUFFALO ROCK STATE PARK...ILLINOIS VALLEY COMMUNITY
COLLEGE...MATTHIESSEN STATE PARK...AND STARVED ROCK STATE PARK.
 
INCLUDING THE FOLLOWING INTERSTATES...
 I-39 BETWEEN MILE MARKERS 46 AND 62.
 I-80 BETWEEN MILE MARKERS 77 AND 90.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4151 8896 4125 8871 4115 8915 4119 8916
      4131 8916
TIME...MOT...LOC 0141Z 233DEG 27KT 4139 8893 

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

BMD

814 
WWUS53 KLOT 290154
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
854 PM CDT SAT MAY 28 2016

ILC099-290215-
/O.CON.KLOT.SV.W.0021.000000T0000Z-160529T0215Z/
LA SALLE IL-
854 PM CDT SAT MAY 28 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR CENTRAL LA SALLE COUNTY...

AT 854 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR UTICA...OR NEAR
OGLESBY...MOVING NORTHEAST AT 35 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
OTTAWA...OGLESBY...LA SALLE...UTICA...NORTH UTICA...GRAND RIDGE...NAPLATE
AND LEONORE.

THIS INCLUDES...  BUFFALO ROCK STATE PARK...MATTHIESSEN STATE PARK...
AND STARVED ROCK STATE PARK.
 
INCLUDING THE FOLLOWING INTERSTATES...
 I-39 NEAR MILE MARKER 56.
 I-80 BETWEEN MILE MARKERS 80 AND 90.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4151 8896 4125 8871 4118 8902 4123 8906
      4132 8908
TIME...MOT...LOC 0154Z 225DEG 29KT 4128 8896 

HAIL...<.75IN
WIND...60MPH
 
$$

BMD

251 
WWUS53 KLOT 290215
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
915 PM CDT SAT MAY 28 2016

ILC099-290225-
/O.EXP.KLOT.SV.W.0021.000000T0000Z-160529T0215Z/
LA SALLE IL-
915 PM CDT SAT MAY 28 2016

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LA SALLE COUNTY HAS
EXPIRED...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS
AND EXITED THE WARNED AREA. THEREFORE THE WARNING HAS BEEN ALLOWED TO
EXPIRE.  HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 4151 8896 4125 8871 4118 8902 4123 8906
      4132 8908
TIME...MOT...LOC 0214Z 232DEG 24KT 4128 8896 

$$

BMD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 7:16 PM CDT	Special Weather Statement	LOT	Ogle	14 min
May 28, 7:42 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, LaSalle, Lee	48 min
May 28, 8:22 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb	23 min
May 28, 8:34 PM CDT	Special Marine Warning	LOT		116 min
May 28, 8:45 PM CDT	Areal Flood Advisory	LOT	DeKalb	2 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2016 Every severe thunderstorm warning in 2016

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.