Alert archive / Illinois / Special Weather Statements in 2012
Special Weather Statement, NWS Chicago, IL
NWS Chicago, IL issued this special weather statement at Apr 14, 2012, 10:40 PM CDT for LaSalle County, Illinois. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 14, 2012, 10:40 PM CDT (03:40 UTC)
- Expired
- Apr 14, 2012, 11:15 PM CDT
- In force
- 35 min
- Issued by
- NWS Chicago, IL
County LaSalle County, IL
The radar
The Chicago radar (KLOT), 60 km from the middle of the area, began a volume at 03:42 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
Davenport, (KDVN), launched 00:00Z, 3.7 hours before the alert went out and 145 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
- 300 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 726 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Apr 14, 10:08 PM CDT, 32 minutes earlier.
Area forecast discussion, Apr 14, 10:08 PM CDT, 32 minutes before
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</html>Hazardous weather outlook, Apr 14, 9:27 PM CDT, 1 hour 13 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 927 PM CDT SAT APR 14 2012 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 160230- WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE- DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON- IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON- 927 PM CDT SAT APR 14 2012 /1027 PM EDT SAT APR 14 2012/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE...OVERNIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...SOME PRODUCING: LOCALLY HEAVY RAINFALL...FREQUENT LIGHTNING...SMALL HAIL...AND STRONG GUSTS TO 45 MPH. AREAS AFFECTED AND TIMING: THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE LATE EVENING OVER WEST-CENTRAL ILLINOIS AND SPREAD OVER MUCH OF NORTHERN ILLINOIS AND INTO NORTHWESTERN INDIANA OVERNIGHT. THUNDERSTORM DISCUSSION: A WARM FRONT WILL CONTINUE TO LIFT NORTHWARD ACROSS CENTRAL AND INTO NORTHERN ILLINOIS OVERNIGHT AS DEEPENING LOW PRESSURE IN THE CENTRAL PLAINS LIFTS NORTHEAST INTO THE UPPER MISSOURI VALLEY. THUNDERSTORMS ARE INITIALLY EXPECTED TO DEVELOP NORTH OF THE WARM FRONT AS IT LIFTS THROUGH WEST-CENTRAL ILLINOIS. AS THE WARM FRONT CONTINUES TO LIFT NORTHWARD OVERNIGHT...THE MAIN FOCUS FOR THE THUNDERSTORMS SHOULD SHIFT INTO NORTHERN ILLINOIS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. MORE THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS NORTHWESTERN ILLINOIS IN ADVANCE OF AN APPROACHING COLD FRONT ON SUNDAY. THUNDERSTORM DEVELOPMENT SHOULD BEGIN BY LATE SUNDAY AFTERNOON AND FOCUS ALONG AND WEST OF THE I-39 CORRIDOR...AND INITIALLY SHOULD BE IN THE FORM OF DISCRETE SUPERCELLS WITH THE POTENTIAL TO PRODUCE STRONG...DAMAGING WINDS...LARGE HAIL AND ISOLATED TORNADOES. BY EARLY EVENING...THUNDERSTORMS SHOULD EVOLVE INTO A LINEAR SQUALL LINE...QUICKLY PROGRESSING EASTWARD THROUGH NORTH CENTRAL AND NORTHEASTERN ILLINOIS AND INTO NORTHWESTERN INDIANA OVERNIGHT. AFTER THE TRANSITION TO A LINEAR SQUALL LINE...THE MAIN SEVERE WEATHER THREAT WILL BE STRONG...DAMAGING WINDS. HOWEVER...HEAVY RAINFALL IN AREAS OF REPEATED ECHO TRAINING COULD LEAD TO LOCALIZED FLASH FLOODING. SUNDAY WILL BE A WINDY DAY WITH SOUTHWEST GUSTS OF AROUND 40 MPH DEVELOPING THROUGH THE DAY. THERE IS SOME CHANCE THAT WIND GUSTS MAY EXCEED 40 MPH LATE IN THE AFTERNOON EVEN WITHOUT THE PRESENCE OF THUNDERSTORMS. THERE IS A SLIGHT CHANCE OF THUNDERSTORMS WEDNESDAY...THURSDAY NIGHT AND FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NECESSARY LATE TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-160230- WINTHROP HARBOR TO WILMETTE HARBOR- WILMETTE HARBOR TO NORTHERLY ISLAND- NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY- GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY- 927 PM CDT SAT APR 14 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...OVERNIGHT. THUNDERSTORMS ARE LIKELY TONIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. SOUTH WINDS INCREASING TO 20 TO 25 KT BY DAWN WILL POSE HAZARDOUS CONDITIONS FOR SMALL CRAFT DURING SUNDAY MORNING. GALES ARE POSSIBLE FORM MIDDAY SUNDAY AND THROUGH THE EVENING. THUNDERSTORMS ARE EXPECTED SUNDAY AND SUNDAY NIGHT. SOME THUNDERSTORMS MAY BECOME SEVERE...PRODUCING WIND GUSTS IN EXCESS OF 50 KT AND LARGE HAIL. THUNDERSTORMS ARE POSSIBLE WEDNESDAY AND FRIDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-160230- LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH FOX ISLAND 5 NM OFFSHORE- LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI- LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO MID LAKE- 927 PM CDT SAT APR 14 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...OVERNIGHT. THUNDERSTORMS ARE POSSIBLE ACROSS MUCH OF LAKE MICHIGAN TONIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. THUNDERSTORMS ARE EXPECTED ACROSS MUCH OF LAKE MICHIGAN SUNDAY AND SUNDAY EVENING. SOME OF THESE STORMS MAY BECOME SEVERE... PRODUCING WIND GUSTS IN EXCESS OF 50 KT AND LARGE HAIL. THUNDERSTORMS ARE POSSIBLE WEDNESDAY AND FRIDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO
In the hours before
Special weather statement, Apr 14, 10:40 PM CDT, 0 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 14, 9:14 PM CDT | Small Craft Advisory | LOT | 11 hr | |
| Apr 14, 11:20 PM CDT | Special Weather Statement | LOT | DuPage, Kendall | 40 min |
| Apr 14, 11:24 PM CDT | Special Weather Statement | LOT | Boone, DeKalb, Kane, Ogle, Winnebago | 36 min |
| Apr 15, 12:00 AM CDT | Special Weather Statement | LOT | Cook, DuPage | 30 min |
| Apr 15, 12:04 AM CDT | Special Weather Statement | LOT | Kane, McHenry | 26 min |
| Apr 15, 12:32 AM CDT | Special Weather Statement | LOT | Cook | 28 min |
| Apr 15, 1:31 AM CDT | Special Weather Statement | LOT | Boone, DeKalb, Kane, McHenry | 29 min |
| Apr 15, 1:37 AM CDT | Special Weather Statement | LOT | Lake | 23 min |
| Apr 15, 2:08 AM CDT | Areal Flood Advisory | LOT | Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more | 3 hr |
| Apr 15, 2:38 AM CDT | Special Weather Statement | LOT | DuPage | 22 min |
| Apr 15, 3:48 AM CDT | Gale Watch | LOT | 24 hr | |
| Apr 15, 3:48 AM CDT | Gale Warning | LOT | 18 hr | |
| Apr 15, 6:33 AM CDT | Special Weather Statement | LOT | Will | 27 min |
| Apr 15, 9:51 AM CDT | Marine Dense Fog Advisory | LOT | 9 hr | |
| Apr 15, 10:18 AM CDT | Wind Advisory | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 10 hr |
Nearby
Special Weather Statements in Illinois, 2012Every special weather statement in 2012
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.