Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 37, NWS Lincoln, IL

April 1, 2012Knox County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Apr 1, 2012, 1:59 AM CDT for Knox County, Illinois. It was in force for 46 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 1, 2012, 1:59 AM CDT (06:59 UTC)
Expired: Apr 1, 2012, 2:45 AM CDT
In force: 46 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

County Knox County, IL

The radar

The Quad Cities radar (KDVN), 76 km from the middle of the area, began a volume at 07:02 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 31, 9:24 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.0 hours before the alert went out and 73 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: 1520 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 306 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

522 
WUUS53 KILX 010659
SVRILX
ILC095-010745-
/O.NEW.KILX.SV.W.0037.120401T0659Z-120401T0745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
159 AM CDT SUN APR 1 2012

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN KNOX COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 245 AM CDT.

* AT 155 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR WATAGA...OR 9 MILES NORTHEAST OF
  GALESBURG...AND MOVING SOUTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ALTONA...VICTORIA...WILLIAMSFIELD...SNAKE DEN HOLLOW AND DAHINDA.

THIS INCLUDES INTERSTATE 74 BETWEEN MILE MARKERS 37 AND 62.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN LINCOLN.

&&

LAT...LON 4109 8998 4092 8999 4087 9010 4103 9039
      4114 9031
TIME...MOT...LOC 0658Z 298DEG 20KT 4104 9025
WIND...HAIL <50MPH 1.75IN

$$

SMITH

3 follow-up statements

277 
WWUS53 KILX 010716
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
216 AM CDT SUN APR 1 2012

ILC095-010745-
/O.CON.KILX.SV.W.0037.000000T0000Z-120401T0745Z/
KNOX IL-
216 AM CDT SUN APR 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN KNOX
COUNTY UNTIL 245 AM CDT...

AT 209 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. 
THIS STORM WAS LOCATED 2 MILES SOUTHEAST OF ONEIDA...OR 12 MILES 
NORTHEAST OF GALESBURG...MOVING SOUTHEAST AT 25 MPH. ANOTHER SEVERE 
THUNDERSTORM WAS DETECTED NEAR SNAKE DEN HOLLOW...MOVING SOUTHEAST 
AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  VICTORIA...WILLIAMSFIELD...SNAKE DEN HOLLOW AND DAHINDA.

THIS INCLUDES INTERSTATE 74 BETWEEN MILE MARKERS 37 AND 62.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE HAD A HISTORY OF PRODUCING PING PONG TO GOLF BALL
SIZE HAIL. 

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN LINCOLN.

&&

LAT...LON 4109 8998 4092 8999 4087 9010 4103 9039
      4114 9031
TIME...MOT...LOC 0714Z 298DEG 20KT 4102 9014
WIND...HAIL <50MPH 1.50IN

$$

SMITH

687 
WWUS53 KILX 010726
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
226 AM CDT SUN APR 1 2012

ILC095-010745-
/O.CON.KILX.SV.W.0037.000000T0000Z-120401T0745Z/
KNOX IL-
226 AM CDT SUN APR 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
KNOX COUNTY UNTIL 245 AM CDT...

AT 223 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. 
THIS STORM WAS LOCATED NEAR VICTORIA...OR 15 MILES EAST OF
GALESBURG...MOVING SOUTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  WILLIAMSFIELD AND DAHINDA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN LINCOLN.

&&

LAT...LON 4106 8999 4092 8999 4089 9009 4095 9018
      4108 9015
TIME...MOT...LOC 0726Z 298DEG 20KT 4099 9009
WIND...HAIL <50MPH 1.50IN

$$

SMITH

186 
WWUS53 KILX 010745
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
245 AM CDT SUN APR 1 2012

ILC095-010755-
/O.EXP.KILX.SV.W.0037.000000T0000Z-120401T0745Z/
KNOX IL-
245 AM CDT SUN APR 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL KNOX COUNTY HAS
EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN LINCOLN.

LAT...LON 4106 8999 4092 8999 4089 9009 4095 9018
      4108 9015
TIME...MOT...LOC 0745Z 298DEG 20KT 4094 8997

$$

SMITH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 1, 1:06 AM CDT	Severe Thunderstorm Warning	ILX	Knox	54 min
Apr 1, 2:20 AM CDT	Severe Thunderstorm Warning	ILX	Peoria, Stark	55 min
Apr 1, 2:42 AM CDT	Special Weather Statement	ILX	Tazewell	63 min
Apr 1, 2:48 AM CDT	Severe Thunderstorm Warning	ILX	Peoria, Tazewell	57 min
Apr 1, 3:15 AM CDT	Severe Thunderstorm Warning	ILX	Peoria, Woodford	30 min
Apr 1, 3:40 AM CDT	Severe Thunderstorm Warning	ILX	Tazewell, Woodford	39 min
Apr 1, 3:43 AM CDT	Severe Thunderstorm Warning	ILX	McLean, Tazewell	47 min
Apr 1, 4:22 AM CDT	Severe Thunderstorm Warning	ILX	McLean, Woodford	38 min
Apr 1, 8:23 AM CDT	Special Weather Statement	ILX	Vermilion	37 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2012 Every severe thunderstorm warning in 2012

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.