Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 267, NWS Lincoln, IL

August 22, 2000Clay County, Effingham County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Aug 22, 2000, 11:48 PM CDT for Clay County, Effingham County, Illinois. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Aug 22, 2000, 11:48 PM CDT (04:48 UTC)
Expired: Aug 23, 2000, 12:30 AM CDT
In force: 42 min
Issued by: NWS Lincoln, IL
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Clay County, IL, Effingham County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 4.8 hours before the alert went out and 130 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: 3363 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 915 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KILX 230448
SVRSPI
ILC025-049-230530-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
1148 PM CDT TUE AUG 22 2000

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EFFINGHAM COUNTY IN SOUTHEAST ILLINOIS
  CLAY COUNTY IN SOUTHEAST ILLINOIS

* UNTIL 1230 AM CDT

* AT 1148 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM TEUTOPOLIS TO 24 MILES WEST OF
  EDGEWOOD...OR FROM 4 MILES NORTHEAST OF EFFINGHAM TO 3 MILES SOUTH
  OF VANDALIA...MOVING SOUTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  DIETERICH
  WATSON
  EDGEWOOD
  IOLA
  BIBLE GROVE
  LOUISVILLE
  SAILOR SPRINGS
  FLORA
  CLAY CITY

DAMAGING WINDS IN EXCESS OF 60 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 3922 8854 3905 8873 3897 8933 3862 8867
          3863 8832 3917 8839

BYRD
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 Aug 22, 2:45 PM CDT, 9 hours 3 minutes earlier.

Area forecast discussion, Aug 22, 2:45 PM CDT, 9 hours 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
245 PM CDT TUE AUG 22 2000

18Z SFC CHART SHOWS MAIN SFC FNT FM WRN NEBRASKA THRU SRN IA...INTO
NW TIP OF IL THEN NEWRD TO GREAT LAKES. SECONDARY BOUNDARY FM NRN MO
TO SRN IL WAS THE FOCUS FOR WAA CONVECTION ACRS ILX CWA LAST NIGHT.
MOST OF THE CONVECTIVE ACTIVITY ATTM CONCENTRATED ACRS SRN WI/NRN IL
FM A CLUSTER THAT DEVELOPED IN IOWA WITH HELP FM A S/WV THIS
MORNING. THIS EXPECTED TO STAY MAINLY NORTH OF US...BUT NUMEROUS
OUTFLOW BOUNDARIES FM THIS COMPLEX AND LAST NIGHT/S CONVECTION
EXPECTED TO TRIGGER STORMS LATER TODAY. 18Z ILX SOUNDING REVEALS
DECENT CAP PREVENTING FURTHER DEVELOPMENT THUS FAR. ANY HEATING SHLD
EFFECTIVELY BREAK THIS CAP. PROBLEM IS...HEATING HAS BEEN CUT TO A
MINIMUM SO FAR WITH EXTENSIVE CLOUDS ACRS MOST OF CRL IL.

MAIN FCST CHALLENGE RESTS ON TIMING OF FROPA AND THE EFFECTIVE THIS
WL HAVE ON PCPN CHANCES ACRS ILX CWA.

UPR RIDGE CONTINUES TO BE FLATTENED ACRS THE NRN CONUS AS S/WVS FROM
MEAN UPR TROF CONT TO ROTATE ACRS THE TOP. NEXT S/WV APPARENT ON WV
LOOP MOVING THRU SRN ND ATTM. WRLY UPR FLOW AHEAD OF THIS WAVE
BECOMES NWRLY BEHIND. UNTIL WE CAN TAP IN ON THIS NWRLY
FLOW...EXPECT ONLY SLOW SWRD PROGRESSION TO FNT. CONVECTIVE
DEVELOPMENT ALONG THE FNT WL ALSO HELP TO PUSH IT SOUTH.
HOWEVER...ALL MODELS ARE IN AGREEMENT THAT THE FNT WL LINGER ACRS
CRL IL INTO TMRW.

MONITORING SERN IA/NWRN MO FOR POSSIBLE CONVECTIVE DEVELOPENT LATE
THIS AFT/THIS EVE. IF THIS SHLD OCCUR...THIS CONVECTION WLD BE AIDED
OVERNIGHT BY LOW-LVL JET AND WAA OVER WARM FNT AS IT TRACKS EAST
THEN SOUTHEAST INTO SRN IN BY MORN.

ALL THIS SAID...PLAN TO EXTEND MENTION OF PCPN INTO MOSTLY MORN
NORTH...AND DURING DAY WED CRL...INTO EVE SOUTHEAST. THIS WLD COVER
ANY WAA DURING NIGHT AND ANY CONVECTION THAT WLD REFIRE ALONG THE
BOUNDARY IN THE DAYTIME HEATING. ETA SUGGESTS CAPES 3000+ DURING
18Z-00Z TIME FRAME WITH LI/S TO -8. YET TO BE SEEN IF ENOUGH
ATMOSPHERIC RECOVERY TIME WLD BE AVAILABLE BEFORE FROPA TO GENERATE
TSRA...SO WL KEEP POPS IN THE 30-40 RANGE.

BY WED NIGHT/THU TIME FRAME...NWRLY UPR FLOW SETS UP ACRS UPR
MIDWEST. MRF SUGGESTS WEAK S/WVS IN THE NWRLY FLOW MAY BRING LOW
POPS TO IL LATE THIS WEEK AND THIS WEEKEND. HOWEVER...HAVE OPTED TO
KEEP EXTENDED FCST DRY...WITH NUMEROUS UNCERTAINTIES...INCLUDING THE
POSITIONING AND MOVEMENT OF HURRICANE DEBBY.

PRELIMINARY CCF FOR COORDINATION PURPOSES ONLY...

SPI EB 071/085 067/084 066 81642
PIA EB 069/083 064/082 065 81641
DEC EB 070/084 066/083 066 81642
CMI EB 069/083 065/081 064 81642
MTO EB 071/086 067/084 066 81643
LWV EE 072/088 068/085 067 81643

.ILX...NONE.

PLAHMER

In the hours before

Special weather statement, Aug 22, 11:13 PM CDT, 35 minutes before

ILZ040>042-047>052-230445-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1113 PM CDT TUE AUG 22 2000

...SEVERE THUNDERSTORM WATCH 703 HAS BEEN CANCELED...

THE SEVERE THUNDERSTORM WATCH FOR SCHUYLER...CASS...MASON...MENARD...
LOGAN...SCOTT...MORGAN...SANGAMON AND CHRISTIAN COUNTIES HAS BEEN
CANCELED.

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP AND MOVE ACROSS
THE AREA OVERNIGHT...BUT REMAIN BELOW SEVERE CRITERIA.

BYRD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 8:42 PM CDT	Severe Thunderstorm Warning	ILX	Scott	63 min
Aug 22, 9:19 PM CDT	Severe Thunderstorm Warning	ILX	Morgan	41 min
Aug 22, 10:29 PM CDT	Severe Thunderstorm Warning	ILX	Christian	31 min
Aug 22, 10:52 PM CDT	Severe Thunderstorm Warning	ILX	Shelby	38 min
Aug 23, 3:07 AM CDT	Severe Thunderstorm Warning	ILX	McLean	38 min
Aug 23, 6:00 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Woodford	60 min
Aug 23, 6:23 PM CDT	Severe Thunderstorm Warning	ILX	Tazewell	52 min
Aug 23, 6:54 PM CDT	Severe Thunderstorm Warning	ILX	McLean	66 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2000 Every severe thunderstorm warning in 2000

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.