Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 84, NWS Lincoln, IL

July 14, 2012Sangamon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 14, 2012, 5:19 PM CDT for Sangamon County, Illinois. It was in force for 23 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: Jul 14, 2012, 5:19 PM CDT (22:19 UTC)
Expired: Jul 14, 2012, 5:42 PM CDT
In force: 23 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Sangamon County, IL

The radar

The Lincoln radar (KILX), 41 km from the middle of the area, began a volume at 22:20 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 12:00Z, 10.3 hours before the alert went out and 84 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: 921 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 830 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: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

141 
WUUS53 KILX 142219
SVRILX
ILC167-142315-
/O.NEW.KILX.SV.W.0084.120714T2219Z-120714T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
519 PM CDT SAT JUL 14 2012

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL SANGAMON COUNTY IN CENTRAL ILLINOIS...

* UNTIL 615 PM CDT.

* AT 515 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  ROCHESTER...OR 6 MILES EAST OF SPRINGFIELD...AND MOVING EAST AT 
  5 TO 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RIVERTON...MECHANICSBURG...SPAULDING...DAWSON AND BUFFALO.

THIS INCLUDES INTERSTATE 55 BETWEEN MILE MARKERS 92 AND 101.

THIS INCLUDES INTERSTATE 72 BETWEEN MILE MARKERS 98 AND 115.

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.

&&

LAT...LON 3992 8942 3977 8936 3975 8942 3976 8942
      3975 8943 3969 8962 3983 8969
TIME...MOT...LOC 2219Z 248DEG 5KT 3978 8953
WIND...HAIL 60MPH 1.00IN

$$

SMITH

1 follow-up statement

089 
WWUS53 KILX 142242
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
542 PM CDT SAT JUL 14 2012

ILC167-142252-
/O.CAN.KILX.SV.W.0084.000000T0000Z-120714T2315Z/
SANGAMON IL-
542 PM CDT SAT JUL 14 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SANGAMON COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 3992 8942 3977 8936 3975 8942 3976 8942
      3975 8943 3969 8962 3983 8969
TIME...MOT...LOC 2242Z 248DEG 5KT 3979 8949

$$

SMITH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 3:38 PM CDT	Special Weather Statement	ILX	Douglas	67 min
Jul 14, 4:42 PM CDT	Special Weather Statement	ILX	Effingham	63 min
Jul 14, 5:41 PM CDT	Special Weather Statement	ILX	Christian	64 min
Jul 14, 5:56 PM CDT	Special Weather Statement	ILX	McLean	64 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.