Alert archive / Illinois / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 199, NWS Lincoln, IL

September 6, 2001Cass County, Morgan County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Sep 6, 2001, 8:10 PM CDT for Cass County, Morgan County, Illinois. It was in force for 35 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: Sep 6, 2001, 8:10 PM CDT (01:10 UTC)
Expired: Sep 6, 2001, 8:45 PM CDT
In force: 35 min
Issued by: NWS Lincoln, IL
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Cass County, IL, Morgan County, IL

The radar

The Lincoln radar (KILX), 103 km from the middle of the area, began a volume at 01:10 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 00:00Z, 1.2 hours before the alert went out and 164 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: 200 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 1364 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

621 
WUUS53 KILX 070110
SVRSPI
ILC017-137-070145-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
810 PM CDT THU SEP 6 2001

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CASS COUNTY IN WEST CENTRAL ILLINOIS
  MORGAN COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 845 PM CDT

* AT 810 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTHEAST OF MEREDOSIA...OR ABOUT 10
  MILES NORTH OF WINCHESTER...MOVING NORTH AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MEREDOSIA
  CHAPIN
  ARENZVILLE
  BEARDSTOWN
  BLUFF SPRINGS

LARGE HAIL IN EXCESS OF 1 INCH WILL ACCOMPANY THIS DANGEROUS STORM.
MOVE INDOORS AND STAY AWAY FROM WINDOWS. 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 3980 9059 3976 9042 4006 9033 3998 9054

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 Sep 6, 2:30 PM CDT, 5 hours 40 minutes earlier.

Area forecast discussion, Sep 6, 2:30 PM CDT, 5 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
230 PM CDT THU SEP 6 2001

FORECAST CHALLENGE THIS PERIOD INCLUDES PRECIP CHANCES AHD OF WEAKENING
SHEAR AXIS TNT INTO FRI MRNG...WITH MORE IMPORTANT SHORTWAVE THREATENING
AREA FRI NIGHT INTO SATURDAY.

WATER VAPOR LOOP CLEARLY SHOWING H5 TROF/SHEAR AXIS LIFTING NEWD INTO
THE SRN/CNTRL PLAINS. MOISTURE PLUME HAS SHIFTED EWD ACRS ENTIRE CWA
WITH SCT TSRA DVLPG AHD OF TROF IN INSTABILITY AXIS WHICH SHOWS UP ON
THE LATEST MSAS. 18Z SFC ANALYSIS INDICATING WEAK TROF AXIS FROM NRN
MO INTO SRN ILLLINOIS WITH THE BULK OF THE TSRA ALONG AND NORTHEAST OF
FEATURE. MODELS FAIRLY CONSISTENT IN THEIR HANDLING OF THE H5 SHEAR
AXIS WHICH MOVES ACRS THE CWA THIS EVENING WITH SOME MODEL DIFFERENCES
SHOWING UP AFTER 36 HRS WITH THE STRONGER CLOSED SYSTEM MOVING INTO THE
SRN PLAINS LT FRIDAY. AVN CONTINUES TO BE THE STRONGER OF THE TWO MODELS
WITH THIS FCST RUN AND BASED ON SATELLITE AND UA DATA...FEEL THAT MAY
BE THE WAY TO GO. STILL SOME FAIRLY STRONG WINDS LOCATED ON THE BACKSIDE
OF THE ERN ID TROF WHICH WOULD SEEM TO INDICATE THE DIGGING PROCESS
WL CONTINUE INTO FRIDAY.

SCT TSRA WL CONTINUE ACRS THE CWA THIS EVENING AND NOT REAL CONFIDENT
ON THE TIMING OF PRECIP ENDING AFTER THE TROF MOVES TO OUR EAST LT
TNT SO WL NOT PUT ANY MENTION OF SHOWERS ENDING TNT. WITH THE SHORTWAVE
TO OUR NE ON FRI AND THE MAJOR SHORTWAVE STILL ACRS THE
PLAINS...DONT SEE ANY REAL STRONG FORCING MECHANISMS TO PRODUCE
WIDESPREAD RAINFALL ACRS THE CWA. HOWEVER...BOTH THE ETA AND AVN
PUSHING SOME WEAK OMEGA ACRS THE AREA DURING THE DAY WHICH MAY BE
ALL IT TAKES TO IGNITE STORMS. MODEL GUID SUGGESTING SOME BREAKS IN
THE CLOUD COVER WHICH SHOULD HELP PUSH THE NUMBERS UP CLOSER TO THE
WARMER FWCS. ITS AMAZING THAT THE TIME HEIGHT CROSS SECTIONS
INDICATE SOME DEEP LAYERS OF RH ACRS THE FCST AREA...BUT YET FCST
TEMPS IN THE MID TO UPPER 80S...WHICH THE TWO METER ETA AGREES WITH.

MODELS SUGGEST BEST LAYERED OMEGA AND QG FORCING APPRCH THE CWA SATURDAY
MRNG AS THE CLOSED SRN STREAM SYSTEM OPENS UP AND IS ABSORBED BY THE
NRN STREAM H5 LOW. BY SAT AFTN AND EVENING...REGION IS IN RIGHT ENTRANCE
REGION OF DEPARTING SPEED MAX WHICH SHOULD ENHANCE THE LIFT ACRS THE
AREA AND POTENTIAL FOR HEAVY RAINFALL. DYNAMIC AND SOME FRONTOGENETICAL
FORCING ARND SATURDAY NIGHT TO CONTINUE SHOWERS...AT LEAST INTO THE
EVENING BEFORE MODELS SUGGEST AREA GETS DRY SLOTTED. ON SUNDAY...IMPRESSIVE
COLD ADVECTION ACRS THE CWA WITH 850-700 MB COLD POOL SETTLING ACRS
THE CWA ALONG WITH SOME DECENT DIF POSITIVE VORT ADVECTION...WHICH
SHOULD KEEP AT LEAST SOME LOW POPS GOING DURING THE DAY (WEST DURING
THE MRNG AND MENTION OF POPS ALL DAY EAST). AFTER THAT...UPPER SYSTEM
TO SHIFT NWD INTO CANADA ALLOWING MORE OF A ZONAL FLOW TO PREVAIL ACRS
THE MIDWEST THRU THE FIRST HALF OF NEXT WEEK PRODUCING COOL BUT DRY
CONDITIONS ACRS CNTRL IL. MED RANGE MODELS HINTING AT ANOTHER FRONT
SHIFTING INTO THE MIDWEST ON THU...BUT MOISTURE RIGHT NOW APPEARS TO
BE LIMITED AHD OF BOUNDARY...SO WL NOT INTRODUCE ANY PRECIP CHANCES FOR
THU. THANKS FOR THE COORD DVN.

...PRELIMINARY CCF FOR COORDINATION PURPOSES ONLY...

SPI ET 070/087 070/078 055 44446
PIA TT 069/085 067/077 052 44466
DEC ET 070/087 070/078 055 44446
CMI ET 067/085 067/078 053 44445
MTO ET 069/086 068/081 058 44444
LWV ET 072/087 072/084 061 44344

.ILX...NONE.

SMITH

In the hours before

Local storm report, Sep 6, 6:46 PM CDT, 1 hour 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN, IL
646 PM CDT THU SEP 6 2001

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

0615 PM    DECATUR                   IL   WIND DAMAGE
09/06/01   MACON                          TREE BLOWN DOWN WITH
                                          POWERLINES. REPORT BY MACON
                                          COUNTY SHERIFF OFFICE.

0625 PM    DECATUR                   IL   WIND DAMAGE
09/06/01   MACON                          POWERLINES BLOWN DOWN AT
                                          SOUTH DRIVE. REPORTED BY
                                          MACON COUNTY SHERIFF
                                          OFFICE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 7:41 PM CDT	Severe Thunderstorm Warning	ILX	Scott	34 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2001 Every severe thunderstorm warning in 2001

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.