Alert archive / Indiana / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 18, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Apr 26, 2007, 4:18 PM CDT for Porter County, Indiana. It was in force for 16 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
- Apr 26, 2007, 4:18 PM CDT (21:18 UTC)
- Expired
- Apr 26, 2007, 4:34 PM CDT
- In force
- 16 min
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
County Porter County, IN
The radar
The Chicago radar (KLOT), 85 km from the middle of the area, began a volume at 21:21 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, 9.3 hours before the alert went out and 198 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
- 171 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 528 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 79 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 Apr 26, 3:50 PM CDT, 28 minutes earlier.
Area forecast discussion, Apr 26, 3:50 PM CDT, 28 minutes before
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</html>Hazardous weather outlook, Apr 26, 4:30 AM CDT, 11 hours 48 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 430 AM CDT THU APR 26 2007 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-270930- WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DU PAGE-COOK- LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD- LAKE IN-PORTER-NEWTON-JASPER-BENTON- 430 AM CDT THU APR 26 2007 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE... TODAY AND TONIGHT PERIODS OF SHOWERS AND THUNDERSTORMS CAN BE EXPECTED ACROSS THE OUTLOOK AREA TODAY. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON INTO EARLY THIS EVENING MAINLY SOUTHEAST OF A LINE FROM GIBSON CITY...TO WATSEKA...TO DE MOTTE INDIANA. THE MAIN THREATS WILL BE LARGE HAIL AND DAMAGING WINDS. FLOODING CONTINUES OR IS FORECASTED ACROSS MANY STREAMS...CREEKS AND RIVERS. THE GROUND IS SATURATED AND ANY ADDITIONAL HEAVY RAIN TODAY MAY LEAD TO NEW OR ADDITIONAL FLOODING. A FLOOD WATCH IS IN EFFECT THROUGH MIDNIGHT TONIGHT FOR PORTIONS OF NORTHEAST ILLINOIS AND NORTHWEST INDIANA. PLEASE SEE THE FOLLOWING FLOOD AND RIVER PRODUCTS FOR DETAILS /CHIFFALOT...CHIFLWLOT...CHIFLSLOT/ .DAYS TWO THROUGH SEVEN... FRIDAY THROUGH WEDNESDAY FLOODING WILL CONTINUE ACROSS MANY AREA STREAMS...CREEKS...AND RIVERS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY...MAINLY SOUTHEAST OF A GIBSON CITY TO DE MOTTE INDIANA LINE. ANY REPORTS OF FLOODING OR RAINFALL AMOUNTS WILL BE GREATLY APPRECIATED. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) LMZ740>745-766-270930- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 430 AM CDT THU APR 26 2007 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE... TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TODAY INTO EARLY THIS EVENING...BUT SEVERE WEATHER IS NOT EXPECTED. .DAYS TWO THROUGH SEVEN... FRIDAY THROUGH WEDNESDAY THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE)
In the hours before
Local storm report, Apr 26, 3:37 PM CDT, 41 minutes before
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 4:15 AM CDT | Flood Watch | LOT | Ford, Iroquois, Kankakee | 15 hr |
| Apr 26, 5:15 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 29 min |
Nearby
Severe Thunderstorm Warnings in Indiana, 2007Every severe thunderstorm warning in 2007
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.