Alert archive / Illinois / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 128, NWS Lincoln, IL

June 12, 2002Knox County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 12, 2002, 8:34 PM CDT for Knox County, Illinois. It was in force for 56 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: Jun 12, 2002, 8:34 PM CDT (01:34 UTC)
Expired: Jun 12, 2002, 9:30 PM CDT
In force: 56 min
Issued by: NWS Lincoln, IL
Area: Counties, with a storm outline in the text

County Knox County, IL

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 nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.6 hours before the alert went out and 70 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: 1544 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 921 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KILX 130134
SVRSPI
ILC095-130230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
834 PM CDT WED JUN 12 2002

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KNOX COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 930 PM CDT

* AT 834 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 5 MILES NORTHWEST OF RIO...OR ABOUT 15 
  MILES NORTH OF GALESBURG...MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ONEIDA
  ALTONA
  GALESBURG
  RIO

LARGE HAIL IN EXCESS OF 2 INCHES 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 4114 9039 4087 9041 4079 9008 4112 9015

EH
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 Jun 12, 2:35 PM CDT, 5 hours 59 minutes earlier.

Area forecast discussion, Jun 12, 2:35 PM CDT, 5 hours 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
230 CDT WED JUN 12 2002

UPR LVL LOW CONTINUES TO SPIN ACROSS THE UPR PLAINS...AS IT SLOWLY
PULLS INTO THE GRT LKS. CONVECTIVE INDUCED VORT (MCV) CURRENTLY
SPINNING ACROSS NWRN MO.   SFC ANALYSIS SHOWS STATIONARY FRONT
LOCATED...ACROSS NRN SECTIONS OF IL INTO SRN IA WITH OUTLFOWS
SAGGING TO CNE IL.  LOTS OF LOW LVL MOISTURE IN PLACE SOUTH OF THESE
BOUNDARYS WITH LOW 70 DWPTS.  QUESTION TNGT INTO THU WILL BE HVY
RAIN CHCS.

BOTH MODELS FAIRLY SIMILIAR WITH FRONTAL BOUNDARY SAGGING ACROSS CEN
IL THIS EVE. THIS BOUNDARY AND MCV IN NRN MO...WILL EVENTULLY LEAD
TO CONVECTION DVLPMNT IN NERN MO AND WRN IL LATER THIS EVE AND
OVERNIGHT.  QUESTION IS WHERE THIS CONVECTIVE COMPLEX WILL TRACK
OVERNIGHT INTO EARLY THU AFTER IT GETS GOING.   ETA AND AVN VERY
DIFFERENT IN PLACEMENT OF MAX QPF OVERNIGHT...WITH ETA LOOKING TOO
FAR NORTH...AND AVN MAYBE OVERDONE DUE TO SOME FEEDBACK PROBLEMS.
WILL EXPAND FLOOD WATCH TNGT FOR ALL AREAS AS HVY RAINS LOOK
POSSIBLE... BUT WILL BROADBRUSH IT...WITH UNCERTAINTY OF AXIS OF
HEAVIEST PCPN. WILL GO LKLY POPS MOST PLACES AS WAVE DVLPS OVER CEN
IL ALONG THE FRONT OVERNIGHT INTO EARLY THU.

WILL KEEP SOME CHC POPS GOING INTO MIDDAY THU AS BOUNDARY SLIDES
SOUTH INTO SRN IL AFTER WAVE PASSES EAST...BUT WILL DRY THINGS OUT
LATE THU AS UPR FLOW GOES MORE NWRLY AS UPR LOW IN UPR PLAINS DIVES
INTO CEN IL ON FRI.

NOT MUCH MOISTURE ACROSS IL AS THIS UPR LOW MOVES ACROSS THE AREA
FRI.  CYCL CURVATURE AND COLD POOL ALOFT WILL HELP INITIATION OF
SHRA AND A FEW TSRA.  BUT WILL KEEP POPS LOW AS SHRA WILL BE
DIURNALLY DRIVEN.

SHRA CHCS CONTINUE THROUGH THE REST OF THE WEKEEND WITH THE LEAST
LIKELY CHC OF RAIN ON SAT.  WILL KEEP CHCS GOING THROUGH TUES AS A
STONGER UPPER LOW DROPS DOWN IN THE MEAN TROUGH...AND CUTS OFF OVER
THE OHIO VLY RGN.

COORDINATED WITH DVN AND STL....THANKS FOR THE MEMORIES.

...PRELIMINARY CCF FOR COORDINATION PURPOSES...

SPI TW 062/074 056/069 052 22752
PIA TW 062/072 054/068 053 22752
DEC TW 062/074 055/070 054 22852
CMI TW 061/074 055/067 052 22862
MTO TW 062/074 060/069 053 22862
LWV TT 065/075 060/071 054 22862

.ILX...FLOOD WATCH FOR WHOLE CWA.

KETCHAM...LAST

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 9:37 PM CDT	Flash Flood Warning	ILX	Knox	6 hr
Jun 12, 11:26 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Knox	64 min
Jun 12, 11:50 PM CDT	Tornado Warning	ILX	Fulton	55 min
Jun 13, 12:43 AM CDT	Tornado Warning	ILX	Fulton, Mason, Tazewell	62 min
Jun 13, 1:30 AM CDT	Tornado Warning	ILX	Logan	60 min
Jun 13, 1:44 AM CDT	Severe Thunderstorm Warning	ILX	Tazewell	61 min
Jun 13, 4:10 AM CDT	Flash Flood Warning	ILX	Morgan, Sangamon	6 hr
Jun 13, 4:23 AM CDT	Flash Flood Warning	ILX	Christian	6 hr
Jun 13, 4:46 AM CDT	Flash Flood Warning	ILX	Scott	5 hr
Jun 13, 5:00 AM CDT	Flash Flood Warning	ILX	Fulton, Peoria, Schuyler, Stark	5 hr
Jun 13, 5:18 AM CDT	Flash Flood Warning	ILX	Shelby	6 hr
Jun 13, 6:06 AM CDT	Flash Flood Warning	ILX	Mason, Tazewell	4 hr
Jun 13, 6:30 AM CDT	Flash Flood Warning	ILX	Coles, Cumberland, Effingham	16 hr
Jun 13, 6:31 AM CDT	Flash Flood Warning	ILX	Coles, Cumberland, Effingham	5 hr
Jun 13, 10:21 AM CDT	Flash Flood Warning	ILX	Sangamon	6 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; the sounding from the Mesonet's radiosonde archive.