Alert archive / Illinois / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 156, NWS Lincoln, IL

July 22, 2002DeWitt County, Macon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 22, 2002, 7:29 PM CDT for DeWitt County, Macon County, Illinois. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 22, 2002, 7:29 PM CDT (00:29 UTC)
Expired: Jul 22, 2002, 8:15 PM CDT
In force: 46 min
Issued by: NWS Lincoln, IL
Area: Counties, with a storm outline in the text

Counties DeWitt County, IL, Macon County, IL

The radar

The Lincoln radar (KILX), 31 km from the middle of the area, began a volume at 00:32 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.

What was reported inside it

Time	Report	Where	Remark
Jul 22, 8:00 PM CDT	Thunderstorm Wind 50 E	Decatur, IL	Thunderstorm winds blew a carport over and moved it 20 yards.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 22, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.5 hours before the alert went out and 33 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: 3265 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 902 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

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

663 
WUUS53 KILX 230029
SVRSPI
ILC039-115-230115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
729 PM CDT MON JUL 22 2002

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DE WITT COUNTY IN CENTRAL ILLINOIS
  MACON COUNTY IN CENTRAL ILLINOIS

* UNTIL 815 PM CDT

* AT 729 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 14 MILES WEST OF WAYNESVILLE TO
  NIANTIC...OR FROM 10 MILES NORTH OF LINCOLN TO 15 MILES WEST OF
  DECATUR...MOVING EAST AT 45 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  WARRENSBURG
  KENNEY
  HARRISTOWN
  WAYNESVILLE
  MAROA
  FORSYTH
  DECATUR
  CLINTON

DAMAGING WINDS IN EXCESS OF 75 MPH WILL ACCOMPANY THIS DANGEROUS
STORM. GO TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. ABANDON CARS AND MOBILE HOMES IF YOU ARE IN THE
WARNED AREA.

REPORT SEVERE WEATHER OR ANY STORM DAMAGE TO YOUR LOCAL ESDA...OR THE
NEAREST LAW ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER
SERVICE. STAY TUNED FOR LATER STATEMENTS.

LAT...LON 4028 8914 4007 8914 3982 8919 3982 8877
          4007 8877 4028 8872

CHURCHILL

NNNN

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lincoln, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 22, 2:17 PM CDT, 5 hours 12 minutes earlier.

Area forecast discussion, Jul 22, 2:17 PM CDT, 5 hours 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
217 PM CDT MON JUL 22 2002

PLENTY OF CONCERNS WITH FOCUS ON SEVERE CONVECTION INTO TONIGHT AND
PRECIPITATION AND TEMPS BEYOND FIRST 24 HOURS.

LATEST 17Z SURFACE ANALYSIS PLACES MAIN SURFACE LOW PRESSURE ACROSS
SOUTHERN CANADA WITH A SURFACE COLD FRONT ACROSS GREAT LAKES REGION
SOUTHWEST INTO THE CENTRAL PLAINS STATES. LATEST 1815Z IR SATELLITE
IMAGE PLACES PLENTY OF CLOUDS ACROSS MICHIGAN SOUTHWEST ACROSS MID
MISSISSIPPI VALLEY. LATEST 1815Z W/V IMAGE PLACES S/W ACROSS CENTRAL
PLAINS STATES/SOUTHWEST IOWA/NORTHWEST MISSOURI. OTHER SW/S WERE
ACROSS WESTERN U.S. NEAR THE COAST.  LATEST 1839Z KILX RADAR
INDICATES SCATTERED THUNDERSTORMS ALONG THE COLD FRONT NORTH OF
PEORIA.  LATEST 1838Z KDVN RADAR INDICATES OTHER SHOWERS AND
THUNDERSTORMS ACROSS CENTRAL AND EASTERN IOWA. LATEST 18Z MSAS AND
LAPS DATA INDICATES CAPES NEAR 4000 J/KG AND LI/S AT -9 ALONG THE
COLD FRONT.

MODELS FAIRLY SIMILAR WITH SOME DIFFERENCES NOTED ELECTING TO USE A
BLEND OF THE MODELS.  PREFER SLOWER MOVEMENT OF COLD FRONT WHICH WAS
DEPICTED BY THE MESOETA.

MODELS HAVE H50 RIDGE MOVING SOUTH AND BUILDING WEST WITH A H50
TROUGH ACROSS GREAT LAKES REGION SOUTH INTO MID MISSISSIPPI VALLEY
BY 06Z TUE.  THIS H50 TROUGH SHIFTS EAST ACROSS EAST COAST BY 00Z
WED.  MODELS DIFFER SLIGHTLY ON TIMING OF COLD FRONT AND PREFER THE
SLOWER MOVEMENT OF COLD FRONT. COLD FRONT IS EXPECTED TO DISSECT THE
CWA BY 00Z TUE...AND REMAIN ACROSS SE ILLINOIS BY 12Z TUE.  COLD
FRONT MOVES SOUTH AS SURFACE HIGH PRESSURE BUILDS ACROSS UPPER
MIDWEST AND GREAT LAKES REGION BY 00Z WED. SURFACE HIGH PRESSURE
MOVES EAST ACROSS EASTERN GREAT LAKES/NORTHEAST U.S. AND A SURFACE
LOW PRESSURE DEVELOPS ACROSS THE PLAINS STATES BY 00Z THU. THIS
SURFACE LOW PRESSURE WAS DEPICTED STRONGER BY THE ETA VERSUS THE AVN
MODEL AND ETA WAS PREFERRED.

850MB TEMPERATURES DROP TO +16C TO +18C ACROSS CWA BY 12Z TUE
THROUGH 12Z WED...THEN SLIGHTLY INCREASES TO +17C TO +19C ACROSS CWA
BY 00Z THU.  THE ETA 310K ISENTROPIC SURFACE INDICATES SOME COND
PRES DEF AND ISENTROPIC LIFT ACROSS CWA THROUGH 06Z TUE...AND
MAINTAINS DECENT COND PRES DEF ACROSS SOUTHEAST ILLINOIS THROUGH 18Z
TUE.  T/H CROSS SECTIONS PROVIDE HIGH RELATIVE HUMIDITY AT LOWER
LEVELS MAINLY THROUGH 00Z WED.  LATEST MODEL SOUNDINGS INDICATE GOOD
INSTABILITY...PW/S AROUND 2.0 INCHES THROUGH 06Z TUE. THEN MAINTAINS
DECENT MOISTURE AT 850MB THROUGH 00Z WED. WILL MENTION A CHANCE FOR
SEVERE AND LOCALLY HEAVY RAINFALL IN FIRST PERIOD ZONES. CURRENT
HEAT ADVISORY WILL BE ALLOWED TO BE EXPIRED.

EXTENDED...LOOKS ON TRACK AND WILL ADD CHANCE OF THUNDERSTORMS ON
MONDAY.

TEMPERATURES FAIRLY SIMILAR AND WILL NOT STRAY FAR FROM GUIDANCE.

...PRELIMINARY CCF FOR COORDINATION PURPOSES...

SPI BB 067/082 059/083 060 13620
PIA BB 065/082 058/082 058 13320
DEC BB 068/082 059/083 060 13630
CMI BB 067/081 057/081 058 13630
MTO BB 070/082 059/083 060 13640
LWV BB 072/083 061/084 062 13762

.ILX...NONE.

BARBUSH/EH

In the hours before

Special weather statement, Jul 22, 6:10 PM CDT, 1 hour 19 minutes before

ILZ027>031-036>038-041>057-061-222340-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
610 PM CDT MON JUL 22 2002

...SEVERE THUNDERSTORM WATCH UPDATE...

THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELED FOR THE
FOLLOWING COUNTIES...

KNOX...STARK...MARSHALL...PEORIA...WOODFORD...AND FULTON

THE WATCH REMAINS IN EFFECT UNTIL 8 PM CDT FOR THE FOLLOWING
COUNTIES...

TAZEWELL...MASON...MCLEAN...LOGAN...DE WITT...CASS...MENARD...
SCOTT...MORGAN...SANGAMON...CHRISTIAN...MACON...PIATT...MOULTRIE...
SHELBY...CHAMPAIGN...VERMILION...DOUGLAS...EDGAR AND COLES.

MILLER

Local storm report, Jul 22, 6:47 PM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN, IL
647 PM CDT MON JUL 22 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0510 PM    2 N WINCHESTER            IL   WIND DAMAGE
07/22/02   SCOTT                          SMALL TREE BLOWN DOWN
                                          REPORTED BY ESDA.

0607 PM    BEARDSTOWN                IL   WIND DAMAGE
07/22/02   CASS                           LARGE TREE LIMBS DOWN
                                          REPORTED BY SHERIFF.

BRO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 7:24 PM CDT	Severe Thunderstorm Warning	ILX	Sangamon	36 min
Jul 22, 8:00 PM CDT	Flash Flood Warning	ILX	McLean	4 hr
Jul 22, 8:25 PM CDT	Flash Flood Warning	ILX	Douglas	6 hr
Jul 22, 8:53 PM CDT	Severe Thunderstorm Warning	ILX	Coles, Cumberland	67 min
Jul 22, 9:08 PM CDT	Tornado Warning	ILX	Cumberland	37 min
Jul 22, 9:22 PM CDT	Severe Thunderstorm Warning	ILX	Clark	38 min
Jul 22, 9:31 PM CDT	Flash Flood Warning	ILX	Edgar	4 hr
Jul 22, 9:36 PM CDT	Severe Thunderstorm Warning	ILX	Crawford	39 min
Jul 22, 10:51 PM CDT	Flash Flood Warning	ILX	Richland	4 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.