Alert archive / Illinois / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 41, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 5, 1994, 3:45 PM CDT for Cook County, Illinois; Lake County, Indiana. It was in force for 45 min.
The area
The counties it named.
The facts
- Issued
- Jul 5, 1994, 3:45 PM CDT (20:45 UTC)
- Expired
- Jul 5, 1994, 4:30 PM CDT
- In force
- 45 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Cook County, IL, Lake County, IN
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.8 hours before the alert went out and 315 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
- 70 J/kg
- Mixed-layer CIN
- -344 J/kg
- Mixed-layer LCL
- 910 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -19 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
In the hours before
Special weather statement, Jul 5, 2:00 PM CDT, 1 hour 45 minutes before
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</html>Special weather statement, Jul 5, 2:15 PM CDT, 1 hour 30 minutes before
ILZ003-004-011-061949- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ROCKFORD IL 215 PM CDT TUE JUL 5 1994 THOSE THUNDERSTORMS COVERING A LARGE PART OF LEE COUNTY ILLINOIS WERE DRIFTING SLOWLY TO THE NORTH INTO SOUTHERN OGLE COUNTY. OTHER STORMS WERE STARTING TO DEVELOP OVER PARTS OF CARROLL AND DE KALB COUNTIES AS WELL. PRESENTLY...OUR MAIN CONCERN IS FLOODING OF LOW LYING AREAS AND FREQUENT CLOUD TO GROUND LIGHTNING STRIKES. MOVEMENT OF THESE STORMS MAY PRODUCE AN INCH OF RAIN IN AN HOURS TIME OR LESS. DO NOT ATTEMPT TO DRIVE THROUGH STANDING WATER. THE BEST BET WOULD BE TO STAY INDOORS AWAY FROM WINDOWS TILL THE STORMS PASS. OTHER STORMS ARE EXPECTED TO DEVELOP OVER MUCH OF THE AREA AS THE AFTERNOON PROGRESSES. FIELDS
Special weather statement, Jul 5, 2:29 PM CDT, 1 hour 16 minutes before
ILZ005-006-012>014-019>023-032-033-039-INZ001-002-052230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 230 PM CDT TUE JUL 5 1994 ...A HEAT ADVISORY REMAINS IN EFFECT FOR THE CHICAGO METROPOLITAN AREA INCLUDING LAKE COUNTY INDIANA THIS AFTERNOON AND EVENING... HEAT INDICES ACROSS THE CHICAGOLAND AREA HAVE EXCEEDED 105 DEGREES AND ARE EXPECTED TO REACH VALUES OF AROUND 110 DEGREES BY LATE THIS AFTERNOON. THESE EXTREME HEAT INDEX VALUES ARE A RESULT OF TEMPERATURES IN THE MID 90S AND AFTERNOON HUMIDITIES BETWEEN 50 AND 60 PERCENT. SUNSTROKE...HEAT CRAMPS AND HEAT EXHAUSTION ARE LIKELY WITH PROLONGED EXPOSURE AND/OR PHYSICAL ACTIVITY UNDER THESE CONDITIONS. PERSONS WHO ARE OUTDOORS SHOULD TAKE APPROPRIATE PRECAUTIONS TO ALLEVIATE THESE SYMPTOMS. CONSIDINE
Special weather statement, Jul 5, 2:30 PM CDT, 1 hour 15 minutes before
ILZ005-006-012>014-019>023-032-033-039-INZ001-002-052230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 230 PM CDT TUE JUL 5 1994 ...A HEAT ADVISORY REMAINS IN EFFECT FOR THE CHICAGO METROPOLITAN AREA INCLUDING LAKE COUNTY INDIANA THIS AFTERNOON AND EVENING... HEAT INDICES ACROSS THE CHICAGOLAND AREA HAVE EXCEEDED 105 DEGREES AND ARE EXPECTED TO REACH VALUES OF AROUND 110 DEGREES BY LATE THIS AFTERNOON. THESE EXTREME HEAT INDEX VALUES ARE A RESULT OF TEMPERATURES IN THE MID 90S AND AFTERNOON HUMIDITIES BETWEEN 50 AND 60 PERCENT. SUNSTROKE...HEAT CRAMPS AND HEAT EXHAUSTION ARE LIKELY WITH PROLONGED EXPOSURE AND/OR PHYSICAL ACTIVITY UNDER THESE CONDITIONS. PERSONS WHO ARE OUTDOORS SHOULD TAKE APPROPRIATE PRECAUTIONS TO ALLEVIATE THESE SYMPTOMS. CONSIDINE
Special weather statement, Jul 5, 3:17 PM CDT, 28 minutes before
ILZ005-006-012>014-020>023-INZ001-052120- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 317 PM CDT TUE JUL 5 1994 ...THUNDERSTORMS DEVELOP SOUTH OF CHICAGO... THE HOT HUMID AIR HAS BOILED UP A NARROW BAND OF THUNDERSTORMS JUST NORTH OF KANKAKEE EXTENDING TOWARD THE SOUTH SUBURBS OF CHICAGO. AT 5 PM THE STRONGEST CELL IS ABOUT 10 MILES NORTH OF KANKAKEE. OTHER THUNDERSTORMS EXTEND NORTH ALONG I57 TOWARD THE SOUTH SHORE OF LAKE MICHIGAN AND WEST OF THE INIANA STATE LINE. THESE THUNDERSTORMS ARE MOVING NORTHEAST ABOUT 25 MPH AND WILL LIKELY DEVELOP INTO WESTERN LAKE COUNTY INDIANA BEFORE 4PM. GUSTY WINDS...VERY HEAVY RAIN SHOWERS AND SMALL HAIL CAN BE EXPECTED WITH THE STRONGER CELLS. KML
Special weather statement, Jul 5, 3:18 PM CDT, 27 minutes before
ILZ005-006-012>014-020>023-INZ001-052120- SPECIAL WEATHER STATEMENT..COR FOR TYPOS NATIONAL WEATHER SERVICE CHICAGO IL 317 PM CDT TUE JUL 5 1994 ...THUNDERSTORMS DEVELOP SOUTH OF CHICAGO... THE HOT HUMID AIR HAS BOILED UP A NARROW BAND OF THUNDERSTORMS JUST NORTH OF KANKAKEE EXTENDING TOWARD THE SOUTH SUBURBS OF CHICAGO. AT 315 PM THE STRONGEST CELL IS ABOUT 10 MILES NORTH OF KANKAKEE. OTHER THUNDERSTORMS EXTEND NORTH ALONG I57 TOWARD THE SOUTH SHORE OF LAKE MICHIGAN AND WEST OF THE INDIANA STATE LINE. THESE THUNDERSTORMS ARE MOVING NORTHEAST ABOUT 25 MPH AND WILL LIKELY DEVELOP INTO WESTERN LAKE COUNTY INDIANA BEFORE 4PM. GUSTY WINDS...VERY HEAVY RAIN SHOWERS AND SMALL HAIL CAN .BE EXPECTED WITH THE STRONGER CELLS. KML
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 4:09 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 38 min |
| Jul 5, 4:43 PM CDT | Tornado Warning | LOT | Kankakee | 32 min |
| Jul 5, 5:04 PM CDT | Severe Thunderstorm Warning | LOT | Benton | 41 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1994Severe Thunderstorm Warnings in Indiana, 1994Every severe thunderstorm warning in 1994
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.