Alert archive / Indiana / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 56, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 5, 2003, 5:59 AM CDT for Lake County, Porter County, Indiana. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 5, 2003, 5:59 AM CDT (10:59 UTC)
- Expired
- Jul 5, 2003, 6:45 AM CDT
- In force
- 46 min
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
Counties Lake County, IN, Porter County, IN
The radar
The Chicago radar (KLOT), 73 km from the middle of the area, began a volume at 10:58 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 5, 3:40 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 11.0 hours before the alert went out and 189 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
- 2705 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1609 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 5, 2:25 AM CDT, 3 hours 34 minutes earlier.
Area forecast discussion, Jul 5, 2:25 AM CDT, 3 hours 34 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO IL 225 AM CDT SAT JUL 5 2003 PUBLIC DISCUSSION FOR MORNING GRIDS/ZONES... SYNOPSIS...SERIES OF UPPER AIR DISTURBANCES WILL CONTINUE TO SPAWN CLUSTERS OF THUNDERSTORMS ACROSS THE UPPER MISSISSPPI VALLEY AND GREAT LAKES INTO MIDWEEK. MOST OF THESE EVENTS WILL BE NOCTURNAL OR EARLY MORNING. DISCUSSION...PERSISTENT DEPRESSED WESTERLY STREAM WITH EMBEDDED IMPULSES WILL KICK OFF TSTM CLUSTERS ACROSS THE NORTHERN PLAINS DURING THE NEXT SEVERAL DAYS WITH THESE MOVING THROUGH THE SOUTHERN LAKES THEREAFTER. ONE CLUSTER NOW BOWING OUT THROUGH EASTERN IOWA WILL RUSH ACROSS NORTHERN ILLINOIS DURING THE ENXT FEW HOURS. THIS ONE SUPPORTED BY RR QUAD OF RETREATING 125KT UPPER JET PROGGED TO MOVE ACROSS UP OF MICH AND NORTHERN THUMB THIS MORNING. 700-500MB FLOW OF 25-45KTS EXPECTED DURING THESE NEXT SEVERAL EVENTS SO BOWING THREAT LIKELY TO BE THE MAIN THREAT FOR THE NEXT FEW DAYS. MODELS...WHILE ALWAYS DOUBTED IN THESE CONVECTIVE SITUATIONS... ARE VALID IN THE OVERALL PATTERN AND MAY BE RIGHT IN HAVING THESE NOCTURNAL EVENTS FOR NRN ILLINOIS. SORT OF A 24HR CYCLE. APPEARS THAT SAT NIGHT AND AGAIN SUN NIGHT MAY BE PLAGUED BY A TSTM THREAT IN THIS AREA. BY MON-TUE A MORE DEFINED AMPLIFICATION IS FORECAST WHICH SHOULD INITIATE A BETTER DEFINED SURFACE CYCLONE MOVING ACROSS THE LAKES EARLY WEDNESDAY. THIS SUGGESTS MON AND PERHAPS TUE WILL BE WARMER DAYS IN MORE SUSTAINED SW FLOW WHILE FINAL ROUND OF CONVECTION TUE NIGHT COULD BE SYNOPTICALLY ORGANIZED. TEMPS NOT VARYING MUCH NEXT SEVERAL DAYS WITH MAXS A FUNCTION OF SUNSHINE AND CLEARING BEHIND THESE CLUSTERS. CONTINUING MUGGY. WILL AVERAGE UPPER 80S OR LOW 90S MOST SPOTS NEXT 2 DAYS THEN LOW 90S OR SO MON-TUE BEFORE HEADING INTO THE UPPER 70S WED. POPS GENERALLY BROAD BRUSHED DUE TO UNCERTAINTIES IN TIMING BUT HIGHER AT NIGHT. KL .CHI...NONE .CHI...NONE MERZLOCK
Hazardous weather outlook, Jul 5, 2:00 AM CDT, 3 hours 59 minutes before
ILZ003>006-008-010>014-019-020>023-032-033-039-INZ001-002-010-011-019
-051100-
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO IL
200 AM CDT SAT JUL 5 2003
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST
ILLINOIS...NORTHWEST INDIANA...AND THE ADJACENT WATERS OF LAKE
MICHIGAN.
.DAY ONE...PREDAWN HOURS
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER MUCH OF
NORTHERN ILLINOIS AND NORTHWEST INDIANA. SEVERE THUNDERSTORM WATCH
NUMBER 641 IS IN EFFECT FOR LEE...OGLE AND WINNEBAGO COUNTIES UNTIL
600 AM.
ANOTHER ACTIVE CLUSTER OF THUNDERSTORMS IS MOVING ACROSS EASTERN
IOWA AND WILL REACH THE MISSISSIPPI RIVER BEFORE 3AM. OTHER
THUNDERSTORMS ARE FORMING ALONG A LINE FROM NEWTON AND JASPER
COUNTIES INDIANA NORTHWEST INTO LEE COUNTY ILLINOIS.
THE STORMS MOVING ACROSS IOWA INTO NORTHWEST ILLINOIS IN THE NEXT
FEW HOURS POSE A WIND DAMAGE THREAT. THEY ARE EXPECTED TO MOVE
ACROSS THE REMAINDER OF NORTHERN ILLINOIS BY OR BEFORE SUNRISE.
THE STORMS FORMING FROM INDIANA INTO NORTHWEST ILLINOIS MAY POSE A
LOCAL FLOOD THREAT DURING THE PREDAWN HOURS. THEY WILL MERGE WITH
THE IOWA STORMS AS TIME GOES ON.
.DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY
THERE IS A CHANCE OF THUNDERSTORMS AGAIN SATURDAY NIGHT INTO SUNDAY
MORNING...AND AGAIN SUNDAY NIGHT THROUGH TUESDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED IN THE NEXT FEW HOURS.
&&
NWS CHICAGO WEBPAGE
HTTP://WWW.CRH.NOAA.GOV/LOT (LOWER CASE)
OR HTTP://WEATHER.NOAA.GOV/CHICAGO (LOWER CASE)
KLIn the hours before
Local storm report, Jul 5, 4:59 AM CDT, 1 hour before
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</html>Local storm report, Jul 5, 5:10 AM CDT, 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
510 AM CDT SAT JUL 05 2003
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0500 AM CRYSTAL LAKE IL 60 MPH TSTM GUST
07/05/03 MCHENRY TREES DOWN. REPORTED BY
STORM SPOTTER.Special weather statement, Jul 5, 5:10 AM CDT, 49 minutes before
>ILZ003-ILZ008-ILZ010-051025- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 510 AM CDT SAT JUL 5 2003 ILZ003-008-010-051025- THE NATIONAL WEATHER SERVICE IN CHICAGO HAS CLEARED COUNTIES IN SEVERE THUNDERSTORM WATCH 641. COUNTIES CLEARED INCLUDE: IN ILLINOIS: LEE...OGLE...WINNEBAGO... THIS INCLUDES THE CITIES OF...DIXON...OREGON...ROCKFORD... ILC999-INC999-LMC999-051025-
Local storm report, Jul 5, 5:35 AM CDT, 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
535 AM CDT SAT JUL 05 2003
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0520 AM ST CHARLES IL 70 MPH TSTM GUST
07/05/03 KANE EVENT DURATION 10
MINUTES. REPORTED BY
OFF-DUTY NWS EMPLOYEE.Special weather statement, Jul 5, 5:50 AM CDT, 9 minutes before
ILZ004-ILZ005-ILZ006-ILZ011-ILZ012-ILZ019-ILZ013-ILZ014-ILZ020- ILZ021-ILZ022-ILZ023-INZ001-INZ002-051110- SPECIAL WEATHER STATEMENT...COR NATIONAL WEATHER SERVICE CHICAGO IL 550 AM CDT SAT JUL 5 2003 ILZ004>006-011-012-019-051110- THE NATIONAL WEATHER SERVICE IN CHICAGO HAS CLEARED A PORTION OF SEVERE THUNDERSTORM WATCH 642. COUNTIES CLEARED INCLUDE: IN ILLINOIS: BOONE...DE KALB...KANE...LAKE...LA SALLE...MCHENRY... THIS INCLUDES THE CITIES OF...AURORA...BELVIDERE...DE KALB... LA SALLE...WAUKEGAN...WOODSTOCK... ILZ013-014-020>023-INZ001-002-051110- SEVERE THUNDERSTORM WATCH 642 REMAINS VALID UNTIL 800 AM CDT SATURDAY FOR THE FOLLOWING COUNTIES: IN ILLINOIS: COOK...DU PAGE...GRUNDY...KANKAKEE...KENDALL...WILL... IN INDIANA: LAKE IN...PORTER... THIS INCLUDES THE CITIES OF...CHICAGO...GARY...JOLIET... KANKAKEE...MORRIS...NAPERVILLE...VALPARAISO...YORKVILLE...
Local storm report, Jul 5, 5:51 AM CDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
551 AM CDT SAT JUL 05 2003
TREE DAMAGE. WINDS ESTIMATED AT 65 MPH.
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0544 AM MIDLOTHIAN IL TREE DAMAGE
07/05/03 COOK REPORTED BY STORM
SPOTTER.The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 3:47 AM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle, Winnebago | 58 min |
| Jul 5, 4:27 AM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry | 48 min |
| Jul 5, 5:02 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Kane, Lake | 43 min |
| Jul 5, 5:07 AM CDT | Special Marine Warning | LOT | 83 min | |
| Jul 5, 5:07 AM CDT | Special Marine Warning | LOT | 83 min | |
| Jul 5, 5:07 AM CDT | Special Marine Warning | LOT | 83 min | |
| Jul 5, 2:45 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 45 min |
| Jul 5, 6:31 AM CDT | Flash Flood Warning | LOT | Jasper, Newton | 3 hr |
| Jul 5, 3:14 PM CDT | Severe Thunderstorm Warning | LOT | Benton | 46 min |
Nearby
Severe Thunderstorm Warnings in Indiana, 2003Every severe thunderstorm warning in 2003
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.