Alert archive / Illinois / Flash Flood Warnings in 1997
Flash Flood Warning 13, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Feb 21, 1997, 11:35 AM CST for Cook County, Lake County, McHenry County, Illinois; Lake County, Indiana. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 21, 1997, 11:35 AM CST (17:35 UTC)
- Expired
- Feb 21, 1997, 6:00 PM CST
- In force
- 6 hr
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Cook County, IL, Lake County, IL, McHenry County, IL, Lake County, IN
The radar
The Chicago radar (KLOT), 50 km from the middle of the area, began a volume at 17:36 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 12:00Z, 5.6 hours before the alert went out and 217 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
- 21 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 806 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 179 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 flash flood 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, Feb 21, 5:50 AM CST, 5 hours 45 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001-211700- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 600 AM CST FRI FEB 21 1997 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND LAKE COUNTY INDIANA A LOW PRESSURE SYSTEM IN THE SOUTHERN PLAINS WILL MOVE NORTHEAST TO ILLINOIS TODAY. AN EXTENEDED PERIOD OF RAIN WILL ACCOMPANY THE SYSTEM AS IT APPROACHES NORTHERN ILLINOIS. THE RAIN MAY BE HEAVY AT TIMES AND WILL POSE A THREAT OF FLOODING. A FLOOD WATCH REMAINS IN EFFECT TODAY FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHEAST INDIANA. IF YOU LIVE ALONG SMALL STREAMS AND LOW LYING AREAS PRONE TO FLOODING BE ALERT FOR FLOODING CONDITIONS TODAY. AS THE LOW PRESSURE CENTER PASSES THROUGH ILLINOIS COLDER AIR WILL HELP CHANGE THE RAIN TO SNOW. THE CHANGEOVER WILL BEGIN BY LATE AFTERNOON OR EVENING. AT FIRST THE RAIN WILL BE MIXED WITH WET SNOW BUT AS TEMPERATURES CONTINUE TO FALL THE RAIN WILL CHANGE TO ALL SNOW. SNOWFALLz AMOUNTS OF 3 TO 5 INCHES ARE EXPECTED BEFORE THE SNOW ENDS LATE TONIGHT AND EARLY SATURDAY. SOMREK
Special weather statement, Feb 21, 5:58 AM CST, 5 hours 37 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001-211700- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 600 AM CST FRI FEB 21 1997 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND LAKE COUNTY INDIANA A LOW PRESSURE SYSTEM IN THE SOUTHERN PLAINS WILL MOVE NORTHEAST TO ILLINOIS TODAY. AN EXTENEDED PERIOD OF RAIN WILL ACCOMPANY THE SYSTEM AS IT APPROACHES NORTHERN ILLINOIS. THE RAIN MAY BE HEAVY AT TIMES AND WILL POSE A THREAT OF FLOODING. A FLOOD WATCH REMAINS IN EFFECT TODAY FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHEAST INDIANA. IF YOU LIVE ALONG SMALL STREAMS AND LOW LYING AREAS PRONE TO FLOODING BE ALERT FOR FLOODING CONDITIONS TODAY. AS THE LOW PRESSURE CENTER PASSES THROUGH ILLINOIS COLDER AIR WILL HELP CHANGE THE RAIN TO SNOW. THE CHANGEOVER WILL BEGIN BY LATE AFTERNOON OR EVENING. AT FIRST THE RAIN WILL BE MIXED WITH WET SNOW BUT AS TEMPERATURES CONTINUE TO FALL THE RAIN WILL CHANGE TO ALL SNOW. SNOWFALLJ AMOUNTS OF 3 TO 5 INCHES ARE EXPECTED BEFORE THE SNOW ENDS LATE TONIGHT AND EARLY SATURDAY. SOMREK
Special weather statement, Feb 21, 6:00 AM CST, 5 hours 35 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001-211700- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 600 AM CST FRI FEB 21 1997 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND LAKE COUNTY INDIANA A LOW PRESSURE SYSTEM IN THE SOUTHERN PLAINS WILL MOVE NORTHEAST TO ILLINOIS TODAY. AN EXTENEDED PERIOD OF RAIN WILL ACCOMPANY THE SYSTEM AS IT APPROACHES NORTHERN ILLINOIS. THE RAIN MAY BE HEAVY AT TIMES AND WILL POSE A THREAT OF FLOODING. A FLOOD WATCH REMAINS IN EFFECT TODAY FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHEAST INDIANA. IF YOU LIVE ALONG SMALL STREAMS AND LOW LYING AREAS PRONE TO FLOODING BE ALERT FOR FLOODING CONDITIONS TODAY. AS THE LOW PRESSURE CENTER PASSES THROUGH ILLINOIS COLDER AIR WILL HELP CHANGE THE RAIN TO SNOW. THE CHANGEOVER WILL BEGIN BY LATE AFTERNOON OR EVENING. AT FIRST THE RAIN WILL BE MIXED WITH WET SNOW BUT AS TEMPERATURES CONTINUE TO FALL THE RAIN WILL CHANGE TO ALL SNOW. SNOWFALL AMOUNTS OF 3 TO 5 INCHES ARE EXPECTED BEFORE THE SNOW ENDS LATE TONIGHT AND EARLY SATURDAY. SOMREK
Special weather statement, Feb 21, 10:52 AM CST, 43 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001-221000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 1100 AM CST FRI FEB 21 1997 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND LAKE COUNTY INDIANA ...FLOOD WARNING CONTINUES IN EFFECT FOR MOST OF NORTH CENTRAL AND NORTHEAST ILLINOIS FOR THIS AFTERNOON... A LOW PRESSURE SYSTEM CENTERED OVER CENTRAL ILLINOIS THIS MORNING WILL MOVE TO NORTHEAST INDIANA BY THIS EVENING. AS THE LOW MOVES TO INDIANA THE RAIN WILL GRADUALLY CHANGE OVER TO SNOW ACROSS THE AREA THIS AFTERNOON AND EVENING. THE HEAVIEST RAINFALL HAS ALREADY ENDED ACROSS THE AREA BUT AN ADDITIONAL QUARTER TO HALF INCH OF RAIN IS LIKELY THIS AFTERNOON BEFORE THE PRECIfPITATION CHANGES OVER TO SNOW. SNOWFALL AMOUNTS OF 2 TO 5 INCHES IS LIKELY LATE THIS AFTERNOON AND TONIGHT WITH THE HEAVIEST AMOUNTS LIKELY OVER NORTH CENTRAL ILLINOIS.
Special weather statement, Feb 21, 11:00 AM CST, 35 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001-221000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 1100 AM CST FRI FEB 21 1997 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND LAKE COUNTY INDIANA ...FLOOD WARNING CONTINUES IN EFFECT FOR MOST OF NORTH CENTRAL AND NORTHEAST ILLINOIS FOR THIS AFTERNOON... A LOW PRESSURE SYSTEM CENTERED OVER CENTRAL ILLINOIS THIS MORNING WILL MOVE TO NORTHEAST INDIANA BY THIS EVENING. AS THE LOW MOVES TO INDIANA THE RAIN WILL GRADUALLY CHANGE OVER TO SNOW ACROSS THE AREA THIS AFTERNOON AND EVENING. THE HEAVIEST RAINFALL HAS ALREADY ENDED ACROSS THE AREA BUT AN ADDITIONAL QUARTER TO HALF INCH OF RAIN IS LIKELY THIS AFTERNOON BEFORE THE PRECIPITATION CHANGES OVER TO SNOW. SNOWFALL AMOUNTS OF 2 TO 5 INCHES IS LIKELY LATE THIS AFTERNOON AND TONIGHT WITH THE HEAVIEST AMOUNTS LIKELY OVER NORTH CENTRAL ILLINOIS.
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 8:14 AM CST | Flash Flood Warning | LOT | Cook, DuPage, Kane, Kendall, Will | 4 hr |
| Feb 21, 8:14 AM CST | Flash Flood Warning | LOT | Boone, DeKalb, Lake, McHenry | 4 hr |
| Feb 21, 8:32 AM CST | Flash Flood Warning | LOT | Cook, DeKalb, DuPage, Kane, Kendall, McHenry and 1 more | 3 hr |
| Feb 21, 8:32 AM CST | Flash Flood Warning | LOT | Grundy, LaSalle, Lee, Livingston | 3 hr |
| Feb 21, 8:32 AM CST | Flash Flood Warning | LOT | Ford, Iroquois, Kankakee | 3 hr |
| Feb 21, 8:32 AM CST | Flash Flood Warning | LOT | Boone, Ogle, Winnebago | 3 hr |
| Feb 21, 8:32 AM CST | Flash Flood Warning | LOT | Lake | 3 hr |
| Feb 21, 11:35 AM CST | Flash Flood Warning | LOT | Grundy, Kankakee, Livingston | 6 hr |
| Feb 21, 11:35 AM CST | Flash Flood Warning | LOT | Boone, Winnebago | 6 hr |
| Feb 21, 11:35 AM CST | Flash Flood Warning | LOT | DuPage, Kane, Kendall, Will | 6 hr |
| Feb 21, 11:35 AM CST | Flash Flood Warning | LOT | DeKalb, LaSalle, Lee, Ogle | 6 hr |
| Feb 21, 8:32 AM CST | Flash Flood Warning | LOT | Lake | 3 hr |
Nearby
Flash Flood Warnings in Illinois, 1997Flash Flood Warnings in Indiana, 1997Every flash flood warning in 1997
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.