Alert archive / Illinois / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 87, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Aug 5, 2000, 4:19 PM CDT for Boone County, McHenry 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 the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Aug 5, 2000, 4:19 PM CDT (21:19 UTC)
- Expired
- Aug 5, 2000, 5:15 PM CDT
- In force
- 56 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Boone County, IL, McHenry County, IL
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.3 hours before the alert went out and 178 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1330 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 148 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KLOT 052121 SVRCHI ILC007-111-052215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHICAGO IL ISSUED BY MILWAUKEE/SULLIVAN WI 419 PM CDT SAT AUG 5 2000 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN BOONE COUNTY IN NORTH CENTRAL ILLINOIS MCHENRY COUNTY IN NORTHEAST ILLINOIS * UNTIL 515 PM CDT * AT 420 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 12 MILES NORTHWEST OF POPLAR GROVE...OR ABOUT 4 MILES EAST OF BELOIT...MOVING SOUTHEAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... POPLAR GROVE AT 430 PM CDT. CAPRON AT 435 PM CDT. HARVARD AT 440 PM CDT. HEBRON AT 455 PM CDT. IF YOU ARE IN THE PATH OF THIS STORM...YOU SHOULD PREPARE FOR DAMAGING WINDS IN EXCESS OF 60 MPH...LARGE HAIL...AND DEADLY LIGHTNING. SEEK SHELTER IMMEDIATELY! LAT...LON 4264 8896 4237 8895 4216 8823 4249 8824
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 Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 5, 3:30 AM CDT, 12 hours 49 minutes earlier.
Area forecast discussion, Aug 5, 3:30 AM CDT, 12 hours 49 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO IL 330 AM CDT SAT AUG 5 2000 MDLS SHOWING FAIRLY DECENT CONTINUITY PAST FEW RUNS IN HANDLING OF NXT WX SYS DUE TO AFFECT FA TNGT-ERLY SUN. GOOD CONSISTENCEY BTWN MDLS AS WELL. WL MAKE NO LRG SCALE CHGS TO GOING FCST. IR SATLT LOOPS SHOW MAIN MCS COVERING ERN SD. HARD TO DETERMINE DIR OF PROPAGATION ATTM BUT DTN LOOPS SHOW INDIVIDUAL CONVECTIVE ELEMENTS DVLPG SWD TWD NERN NE AND PERHAPS NWRN IA. THIS IS CONSISTENT WITH FCST THICKNESS FIELD. PROFILERS PAST SVRL HRS ALSO SUG THIS SYS SHUD CONT FAIRLY INTACT AS IT DROPS SSEWD TO W OF IL. BASED ON THIS EXPECTR CONVECTIVE DEBRIS/ANVIL CANOPY WL OVRSPRD AREA TDY. SIG VORT MAX TO MOV FM NRN PLAINS TO UPR GRTLKS TNGT. THIS WL SHFT TSTM GENERATION AREA EWD INTO UPR MIDWEST/UPR GRTLKS RGN WITH THIS ACTIVITY THEN DROPPING SEWD INTO NRN IL. SHWRS COULD MOV INTO NRN IL AS EARLY AS LATE AFTN...BUT BASED ON FCST WIND PROFILES AND MDL SOUNDINGS SHOWING SIGNIFICANT DESTBLZN...BEST CHC FOR TSTMS STILL LUKS LIKE TNGT. WUD LIKE TO SEE FCST ISENTROPIC DATA BUT ONLY BITS AND PIECES OF 00Z SAT ISENTROPIC GRAPHICS HAVE LOADED TO AWIPS. BY SUN MRNG...BEST LO LVL FORCING/ MOISTURE CONVERGENCE SHIFTS EWD. DFUS SFC BNDRY FCST TO HANG UP TO N/NW OF FA. EVENTHOUGH BEST LIFT SHIFTS E OF AREA AND LO LVL FLO BCMS A/CYCLNC...ENUF INSTBY FCST THAT LO CHC POPS APPEAR BEST ROUTE TO GO. NONETHELESS...AFTER WAA TSTMS MOVE THRU TNGT-ERLY SUN THERE SHUD BE A BRK IN THE ACTION WITH PCPN BCMG ISOLD UNTIL SUN NGT-MON WHEN NXT DSTBC INDUCES BETTER LO LVL FLO FIELD FOR NOCTURNAL TSTM DVLPMT. MOS TEMPS STILL IN RESONABLY CLOSE AGREEMENT AND WL DEVIATE LTL FM GUID FOR FCST TEMPS. .CHI...NONE MERZLOCK
In the hours before
Special weather statement, Aug 5, 12:09 PM CDT, 4 hours 10 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019- 061100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL NOON CDT/EST SAT AUG 5 2000 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE REGION TONIGHT. AS AN UPPER LEVEL WEATHER DISTURBANCE IS MOVING INTO THE UPPER GREAT LAKES TODAY. AN INCREASING SOUTH FLOW OF WARMER AND MORE HUMID AIR WILL PUSH INTO THE REGION...HELPING MORE THUNDERSTORMS TO DEVELOP THIS AFTERNOON AND TONIGHT. SOME OF THESE STORMS MAY CONTAIN DAMAGING STRAIGHT-LINE WINDS AND HAIL. THE MAIN THREAT FOR SEVERE ACTIVITY WILL REMAIN WEST AND SOUTH OF THE AREA TONIGHT. A COLD FRONT WILL DROP SOUTHEAST OUT OF IOWA AND WISCONSIN TONIGHT AND BECOME STATIONARY OVER NORTHERN ILLINOIS ON SUNDAY. HIGH DEWPOINTS AND A LINGERING UNSTABLE ENVIRONMENT SOUTH OF THIS FRONT COULD FEED REDEVELOPMENT OF THUNDERSTORMS ON SUNDAY. THESE COULD LIKELY BE TRIGGERED BY DAYTIME HEATING...AND COULD REACH SEVERE STRENGTH. THIS POTENTIALLY SEVERE AREA WOULD GENERALLY LIE OVER SOUTH AND EASTERN PORTIONS OF THE AREA. BRUMER
Nearby
Severe Thunderstorm Warnings in Illinois, 2000Every 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.