UPDATED: Tornado watch extended to Indiana line

UPDATED: Tornado watch extended to Indiana line

UPDATED 5:20 p.m.

The National Weather Service has extended a tornado watch for much of central Illinois, including some counties on the state line with Indiana. Champaign, Vermiliion, Douglas, Edgar and Coles counties are included.

The original notice from the weather service:
 

TORNADO WATCH OUTLINE UPDATE FOR WT 602

NWS STORM PREDICTION CENTER NORMAN OK
1245 PM CDT SAT SEP 1 2012

TORNADO WATCH 602 IS IN EFFECT UNTIL 900 PM CDT FOR THE
 FOLLOWING LOCATIONS

ILC017-019-021-029-035-039-041-057-095-107-113-115-123-125-129-
137-139-143-147-167-169-171-173-175-179-203-020200-
/O.NEW.KWNS.TO.A.0602.120901T1745Z-120902T0200Z/

IL
.    ILLINOIS COUNTIES INCLUDED ARE

CASS                 CHAMPAIGN           CHRISTIAN
COLES                CUMBERLAND          DE WITT
DOUGLAS              FULTON              KNOX
LOGAN                MACON               MARSHALL
MASON                MCLEAN              MENARD
MORGAN               MOULTRIE            PEORIA
PIATT                SANGAMON            SCHUYLER
SCOTT                SHELBY              STARK
TAZEWELL             WOODFORD

Here's the updated notice:

WATCH COUNTY NOTIFICATION FOR WATCH 602
NATIONAL WEATHER SERVICE LINCOLN IL
119 PM CDT SAT SEP 1 2012

ILC023-025-033-045-049-079-101-159-183-020200-
/O.EXA.KILX.TO.A.0602.000000T0000Z-120902T0200Z/

THE NATIONAL WEATHER SERVICE HAS EXTENDED TORNADO WATCH 602 TO
INCLUDE THE FOLLOWING AREAS UNTIL 9 PM CDT THIS EVENING

IN ILLINOIS THIS WATCH INCLUDES 9 COUNTIES

IN EAST CENTRAL ILLINOIS

CLARK                 CRAWFORD              EDGAR
VERMILION

IN SOUTH CENTRAL ILLINOIS

CLAY                  EFFINGHAM

IN SOUTHEAST ILLINOIS

JASPER                LAWRENCE              RICHLAND

THIS INCLUDES THE CITIES OF...DANVILLE...EFFINGHAM...
FLORA AND LAWRENCEVILLE.
From the weather service's glossary:

Tornado Watch

This is issued by the National Weather Service when conditions are favorable for the development of tornadoes in and close to the watch area. Their size can vary depending on the weather situation. They are usually issued for a duration of 4 to 8 hours. They normally are issued well in advance of the actual occurrence of severe weather. During the watch, people should review tornado safety rules and be prepared to move a place of safety if threatening weather approaches. 

A Tornado Watch is issued by the Storm Prediction Center (SPC) in Norman, Oklahoma. Prior to the issuance of a Tornado Watch, SPC will usually contact the affected local National Weather Forecast Office (NWFO) and they will discuss what their current thinking is on the weather situation. Afterwards, SPC will issue a preliminary Tornado Watch and then the affected NWFO will then adjust the watch (adding or eliminating counties/parishes) and then issue it to the public. After adjusting the watch, the NWFO will let the public know which counties are included by way of a Watch Redefining Statement. During the watch, the NWFO will keep the public informed on what is happening in the watch area and also let the public know when the watch has expired or been cancelled.

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