Alert archive / Indiana / Winter Storm Warnings in 2011
Winter Storm Warning 2, NWS Chicago, IL
NWS Chicago, IL issued this winter storm warning at Feb 24, 2011, 5:12 AM EST for Benton County, Jasper County, Newton County, Indiana; Ford County, Iroquois County, Livingston County, Illinois. It took effect at Feb 24, 2011, 7:00 PM EST. It was in force for 13 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 24, 2011, 5:12 AM EST (10:12 UTC)
- In effect from
- Feb 24, 2011, 7:00 PM EST
- Expired
- Feb 25, 2011, 7:50 AM EST
- In force
- 13 hr
- Issued by
- NWS Chicago, IL
Counties Ford County, IL, Iroquois County, IL, Livingston County, IL, Benton County, IN, Jasper County, IN, Newton County, IN
The radar
The Chicago radar (KLOT), 94 km from the middle of the area, began a volume at 10:12 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 00:00Z, 10.2 hours before the alert went out and 103 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 671 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 427 m²/s²
- 0-3 km storm-relative helicity
- 465 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
721 WWUS43 KLOT 241012 WSWLOT URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE CHICAGO IL 412 AM CST THU FEB 24 2011 ...HEAVY SNOW POSSIBLE ACROSS PORTIONS OF EAST CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA THIS EVENING INTO FRIDAY MORNING... .LOW PRESSURE WILL MOVE FROM THE SOUTHERN PLAINS AND UP THE OHIO VALLEY LATER TODAY INTO FRIDAY. PRECIPITATION WILL SPREAD INTO THE AREA BY LATE THIS EVENING AND CONTINUE OVERNIGHT BEFORE ENDING FRIDAY MORNING. PRECIPITATION MAY START AS A BRIEF PERIOD OF A MIX OF RAIN...SNOW...AND SLEET ACROSS THE WARNING AREA BEFORE QUICKLY TRANSITIONING TO SNOW. ILZ032-033-039-INZ010-011-019-241815- /O.UPG.KLOT.WS.A.0003.110225T0000Z-110225T1500Z/ /O.NEW.KLOT.WS.W.0002.110225T0000Z-110225T1500Z/ LIVINGSTON-IROQUOIS-FORD-NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...PONTIAC...WATSEKA...PAXTON...MOROCCO... RENSSELAER...FOWLER 412 AM CST THU FEB 24 2011 /512 AM EST THU FEB 24 2011/ ...WINTER STORM WARNING IN EFFECT FROM 6 PM CST /7 PM EST/ THIS EVENING TO 9 AM CST /10 AM EST/ FRIDAY... THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A WINTER STORM WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM 6 PM CST /7 PM EST/ THIS EVENING TO 9 AM CST /10 AM EST/ FRIDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. * TIMING...PRECIPITATION IS EXPECTED TO BEGIN THIS EVENING. A MIX OF SNOW...SLEET...AND RAIN MAY BRIEFLY OCCUR AS PRECIPITATION STARTS BUT WILL QUICKLY TURN TO SNOW. * ACCUMULATIONS...AMOUNTS IN EXCESS OF 6 INCHES ARE LIKELY. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR LATE THURSDAY EVENING. * HAZARDS...HEAVY SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH CAUSING BLOWING AND DRIFTING OF SNOW. VISIBILITY BELOW ONE-HALF MILE. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. && $$ ILZ023-INZ001-002-241815- /O.UPG.KLOT.WS.A.0003.110225T0000Z-110225T1500Z/ /O.NEW.KLOT.WW.Y.0006.110225T0000Z-110225T1500Z/ KANKAKEE-LAKE IN-PORTER- INCLUDING THE CITIES OF...KANKAKEE...GARY...VALPARAISO 412 AM CST THU FEB 24 2011 ...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 9 AM CST FRIDAY... THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOWFALL AMOUNTS OF 3 TO 5 INCHES....WHICH IS IN EFFECT FROM 6 PM THIS EVENING TO 9 AM CST FRIDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT. * TIMING...PRECIPITATION IS EXPECTED TO BEGIN THIS EVENING. A MIX OF SNOW...SLEET... AND RAIN MAY BRIEFLY OCCUR MAINLY SOUTH OF INTERSTATE 80 BUT WILL QUICKLY TURN TO SNOW. * ACCUMULATIONS...AMOUNTS OF 3 TO 5 INCHES LIKELY...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR LATE THIS EVENING. * HAZARDS...SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH MAY PRODUCE AREAS OF BLOWING AND DRIFTING SNOW. VISIBILITY MAY DROP BELOW ONE-HALF MILE AT TIMES. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ ILZ003>006-008-010>014-019>022-241815- /O.NEW.KLOT.WW.Y.0006.110225T0000Z-110225T1500Z/ WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK- LA SALLE-KENDALL-GRUNDY-WILL- INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK... WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO... OTTAWA...OSWEGO...MORRIS...JOLIET 412 AM CST THU FEB 24 2011 ...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 9 AM CST FRIDAY... THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOWFALL AMOUNTS OF 3 TO 5 INCHES...WHICH IS IN EFFECT FROM 6 PM THIS EVENING TO 9 AM CST FRIDAY. * TIMING...SNOW IS EXPECTED TO BEGIN THIS EVENING. * ACCUMULATIONS...AMOUNTS OF 3 TO 5 INCHES LIKELY...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR LATE THIS EVENING. * HAZARDS...SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH MAY PRODUCE AREAS OF BLOWING AND DRIFTING SNOW. VISIBILITY MAY DROP BELOW ONE-HALF MILE AT TIMES. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ LENNING
7 follow-up statements
522 WWUS43 KLOT 241642 WSWLOT URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE CHICAGO IL 1042 AM CST THU FEB 24 2011 ...HEAVY SNOW POSSIBLE ACROSS PORTIONS OF EAST CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA THIS EVENING INTO FRIDAY MORNING... .LOW PRESSURE WILL MOVE FROM THE SOUTHERN PLAINS AND UP THE OHIO VALLEY LATER TODAY INTO FRIDAY. PRECIPITATION WILL SPREAD INTO THE AREA BY LATE THIS EVENING AND CONTINUE OVERNIGHT BEFORE ENDING FRIDAY MORNING. PRECIPITATION MAY START AS A BRIEF PERIOD OF A MIX OF RAIN...SNOW...AND SLEET ACROSS THE WARNING AREA BEFORE QUICKLY TRANSITIONING TO SNOW. ILZ032-033-039-INZ010-011-019-250045- /O.CON.KLOT.WS.W.0002.110225T0000Z-110225T1500Z/ LIVINGSTON-IROQUOIS-FORD-NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...PONTIAC...WATSEKA...PAXTON...MOROCCO... RENSSELAER...FOWLER 1042 AM CST THU FEB 24 2011 /1142 AM EST THU FEB 24 2011/ ...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM CST /7 PM EST/ THIS EVENING TO 9 AM CST /10 AM EST/ FRIDAY... A WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM CST /7 PM EST/ THIS EVENING TO 9 AM CST /10 AM EST/ FRIDAY. * TIMING...PRECIPITATION IS EXPECTED TO BEGIN EARLY THIS EVENING. A MIX OF SNOW...SLEET...AND RAIN MAY BRIEFLY OCCUR AS PRECIPITATION STARTS BUT WILL QUICKLY TURN TO SNOW. * ACCUMULATIONS...AMOUNTS IN EXCESS OF 6 INCHES ARE LIKELY. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR LATE THURSDAY EVENING. * HAZARDS...HEAVY SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH CAUSING BLOWING AND DRIFTING OF SNOW. VISIBILITY BELOW ONE-HALF MILE. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. && $$ ILZ003>006-008-010>014-019>023-INZ001-002-250045- /O.CON.KLOT.WW.Y.0006.110225T0000Z-110225T1500Z/ WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK- LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LAKE IN-PORTER- INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK... WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO... OTTAWA...OSWEGO...MORRIS...JOLIET...KANKAKEE...GARY...VALPARAISO 1042 AM CST THU FEB 24 2011 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 9 AM CST FRIDAY... A WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 9 AM CST FRIDAY. * TIMING...SNOW IS EXPECTED TO BEGIN THIS EVENING. * ACCUMULATIONS...AMOUNTS OF 3 TO 5 INCHES LIKELY...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR LATE THIS EVENING. * HAZARDS...SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH MAY PRODUCE AREAS OF BLOWING AND DRIFTING SNOW. VISIBILITY MAY DROP BELOW ONE-HALF MILE AT TIMES. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MDB
714 WWUS43 KLOT 242116 WSWLOT URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE CHICAGO IL 316 PM CST THU FEB 24 2011 ...HEAVY SNOW EXPECTED ACROSS PORTIONS OF EAST CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA THIS EVENING INTO FRIDAY MORNING... .LOW PRESSURE WILL MOVE FROM THE SOUTHERN PLAINS AND UP THE OHIO VALLEY LATER THIS EVENING INTO FRIDAY. PRECIPITATION WILL SPREAD INTO THE AREA THIS EVENING AND CONTINUE OVERNIGHT BEFORE ENDING FRIDAY MORNING. PRECIPITATION MAY START AS A BRIEF PERIOD OF A MIX OF RAIN...SNOW...AND SLEET ACROSS THE WARNING AREA BEFORE QUICKLY TRANSITIONING TO SNOW. ILZ032-033-039-INZ010-011-019-250530- /O.CON.KLOT.WS.W.0002.110225T0000Z-110225T1500Z/ LIVINGSTON-IROQUOIS-FORD-NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...PONTIAC...WATSEKA...PAXTON...MOROCCO... RENSSELAER...FOWLER 316 PM CST THU FEB 24 2011 /416 PM EST THU FEB 24 2011/ ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ FRIDAY... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ FRIDAY. * TIMING...PRECIPITATION IS EXPECTED TO BEGIN EARLY THIS EVENING. A MIX OF SNOW...SLEET...AND RAIN MAY BRIEFLY OCCUR AS PRECIPITATION STARTS BUT WILL QUICKLY TURN TO SNOW. * ACCUMULATIONS...AMOUNTS OF 6 TO 8 INCHES ARE LIKELY. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR LATE THIS EVENING. * HAZARDS...HEAVY SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH CAUSING BLOWING AND DRIFTING OF SNOW. VISIBILITY BELOW ONE-HALF MILE. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. && $$ ILZ003>006-008-010>014-019>023-INZ001-002-250530- /O.CON.KLOT.WW.Y.0006.110225T0000Z-110225T1500Z/ WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK- LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LAKE IN-PORTER- INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK... WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO... OTTAWA...OSWEGO...MORRIS...JOLIET...KANKAKEE...GARY...VALPARAISO 316 PM CST THU FEB 24 2011 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST FRIDAY... A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST FRIDAY. * TIMING...SNOW IS EXPECTED TO BEGIN THIS EVENING. * ACCUMULATIONS...AMOUNTS OF 3 TO 5 INCHES LIKELY...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR LATE THIS EVENING. * HAZARDS...SNOW. NORTH TO NORTHEAST WINDS GUSTING TO 25 TO 30 MPH MAY PRODUCE AREAS OF BLOWING AND DRIFTING SNOW. GUSTS UP TO 35 MPH ARE POSSIBLE ALONG THE LAKE MICHIGAN SHORELINE. VISIBILITY MAY DROP BELOW ONE-HALF MILE AT TIMES. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ MDB/BEACHLER
765 WWUS43 KLOT 250139 WSWLOT URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE CHICAGO IL 739 PM CST THU FEB 24 2011 ...HEAVY SNOW EXPECTED ACROSS PORTIONS OF EAST CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA THIS EVENING INTO FRIDAY MORNING... .LOW PRESSURE WILL MOVE FROM THE SOUTHERN PLAINS AND UP THE OHIO VALLEY THIS EVENING INTO FRIDAY. PRECIPITATION WILL SPREAD INTO THE AREA THIS EVENING AND CONTINUE OVERNIGHT BEFORE ENDING FRIDAY MORNING. PRECIPITATION MAY START AS A BRIEF PERIOD OF A MIX OF RAIN...SNOW...AND SLEET ACROSS THE WARNING AREA BEFORE QUICKLY TRANSITIONING TO SNOW. ILZ003>006-008-250245- /O.CAN.KLOT.WW.Y.0006.000000T0000Z-110225T1500Z/ WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE- INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK... WAUKEGAN...OREGON 739 PM CST THU FEB 24 2011 ...WINTER WEATHER ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN CHICAGO HAS CANCELLED THE WINTER WEATHER ADVISORY. LIGHT SNOW WILL DEVELOP LATER THIS EVENING AND CONTINUE OVERNIGHT. HOWEVER...SNOWFALL TOTALS OF 1 TO 3 INCHES ARE NOW EXPECTED WHICH IS BELOW ADVISORY CRITERIA. $$ ILZ032-033-039-INZ010-011-019-250945- /O.CON.KLOT.WS.W.0002.000000T0000Z-110225T1500Z/ LIVINGSTON-IROQUOIS-FORD-NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...PONTIAC...WATSEKA...PAXTON...MOROCCO... RENSSELAER...FOWLER 739 PM CST THU FEB 24 2011 /839 PM EST THU FEB 24 2011/ ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ FRIDAY... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ FRIDAY. * TIMING...PRECIPITATION CONTINUES TO OVERSPREAD THE AREA. AT THE ONSET...A MIX OF SNOW...SLEET...AND RAIN MAY OCCUR BUT WILL QUICKLY TURN TO SNOW. * ACCUMULATIONS...AMOUNTS OF 6 TO 8 INCHES ARE LIKELY. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR BETWEEN MIDNIGHT AND 5 AM EST. * HAZARDS...HEAVY SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH CAUSING BLOWING AND DRIFTING OF SNOW. VISIBILITY BELOW ONE-HALF MILE. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. && $$ ILZ010>014-019>023-INZ001-002-250945- /O.CON.KLOT.WW.Y.0006.000000T0000Z-110225T1500Z/ LEE-DE KALB-KANE-DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL- KANKAKEE-LAKE IN-PORTER- INCLUDING THE CITIES OF...DIXON...DEKALB...AURORA...WHEATON... CHICAGO...OTTAWA...OSWEGO...MORRIS...JOLIET...KANKAKEE...GARY... VALPARAISO 739 PM CST THU FEB 24 2011 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST FRIDAY... A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST FRIDAY. * TIMING...SNOW WILL CONTINUE TO DEVELOP LATER THIS EVENING AND PERSIST OVERNIGHT BEFORE TAPERING TO FLURRIES AFTER DAYBREAK FRIDAY. * ACCUMULATIONS...AMOUNTS OF 3 TO 5 INCHES LIKELY...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR BETWEEN MIDNIGHT THROUGH 5 AM EST. * HAZARDS...SNOW. NORTH TO NORTHEAST WINDS GUSTING TO 25 TO 30 MPH MAY PRODUCE AREAS OF BLOWING AND DRIFTING SNOW. GUSTS UP TO 35 MPH ARE POSSIBLE ALONG THE LAKE MICHIGAN SHORELINE. VISIBILITY MAY DROP BELOW ONE-HALF MILE AT TIMES. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ BEACHLER
213 WWUS43 KLOT 250248 WSWLOT URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE CHICAGO IL 848 PM CST THU FEB 24 2011 ILZ032-033-039-251100- /O.CAN.KLOT.WS.W.0002.000000T0000Z-110225T1500Z/ /O.EXA.KLOT.WW.Y.0006.000000T0000Z-110225T1500Z/ LIVINGSTON-IROQUOIS-FORD- INCLUDING THE CITIES OF...PONTIAC...WATSEKA...PAXTON 848 PM CST THU FEB 24 2011 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM CST FRIDAY... ...WINTER STORM WARNING IS CANCELLED... THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A WINTER WEATHER ADVISORY WHICH IS IN EFFECT UNTIL 9 AM CST FRIDAY. THE WINTER STORM WARNING HAS BEEN CANCELLED. * TIMING...SNOW WILL CONTINUE TO DEVELOP LATER THIS EVENING AND PERSIST OVERNIGHT BEFORE TAPERING TO FLURRIES AFTER DAYBREAK FRIDAY. * ACCUMULATIONS...AMOUNTS OF 3 TO 5 INCHES LIKELY...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR BETWEEN MIDNIGHT THROUGH 5 AM EST. * HAZARDS...SNOW. NORTH TO NORTHEAST WINDS GUSTING TO 25 TO 30 MPH MAY PRODUCE AREAS OF BLOWING AND DRIFTING SNOW. GUSTS UP TO 35 MPH ARE POSSIBLE ALONG THE LAKE MICHIGAN SHORELINE. VISIBILITY MAY DROP BELOW ONE-HALF MILE AT TIMES. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ ILZ010>014-250400- /O.CAN.KLOT.WW.Y.0006.000000T0000Z-110225T1500Z/ LEE-DE KALB-KANE-DUPAGE-COOK- INCLUDING THE CITIES OF...DIXON...DEKALB...AURORA...WHEATON... CHICAGO 848 PM CST THU FEB 24 2011 ...WINTER WEATHER ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN CHICAGO HAS CANCELLED THE WINTER WEATHER ADVISORY. LIGHT SNOW WILL DEVELOP LATER THIS EVENING AND CONTINUE OVERNIGHT. HOWEVER...SNOWFALL TOTALS OF 1 TO 3 INCHES ARE NOW EXPECTED WHICH IS BELOW ADVISORY CRITERIA. $$ INZ010-011-019-251100- /O.CON.KLOT.WS.W.0002.000000T0000Z-110225T1500Z/ NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...MOROCCO...RENSSELAER...FOWLER 848 PM CST THU FEB 24 2011 /948 PM EST THU FEB 24 2011/ ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ FRIDAY... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ FRIDAY. * TIMING...PRECIPITATION CONTINUES TO OVERSPREAD THE AREA. AT THE ONSET...A MIX OF SNOW...SLEET...AND RAIN MAY OCCUR BUT WILL QUICKLY TURN TO SNOW. * ACCUMULATIONS...AMOUNTS OF 5 TO 7 INCHES ARE LIKELY. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR BETWEEN MIDNIGHT AND 5 AM EST. * HAZARDS...HEAVY SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH CAUSING BLOWING AND DRIFTING OF SNOW. VISIBILITY BELOW ONE-HALF MILE. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. && $$ ILZ019>023-INZ001-002-251100- /O.CON.KLOT.WW.Y.0006.000000T0000Z-110225T1500Z/ LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LAKE IN-PORTER- INCLUDING THE CITIES OF...OTTAWA...OSWEGO...MORRIS...JOLIET... KANKAKEE...GARY...VALPARAISO 848 PM CST THU FEB 24 2011 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST FRIDAY... A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST FRIDAY. * TIMING...SNOW WILL CONTINUE TO DEVELOP LATER THIS EVENING AND PERSIST OVERNIGHT BEFORE TAPERING TO FLURRIES AFTER DAYBREAK FRIDAY. * ACCUMULATIONS...AMOUNTS OF 3 TO 5 INCHES LIKELY...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. ACCUMULATION RATES MAY EXCEED ONE INCH PER HOUR BETWEEN MIDNIGHT THROUGH 5 AM EST. * HAZARDS...SNOW. NORTH TO NORTHEAST WINDS GUSTING TO 25 TO 30 MPH MAY PRODUCE AREAS OF BLOWING AND DRIFTING SNOW. GUSTS UP TO 35 MPH ARE POSSIBLE ALONG THE LAKE MICHIGAN SHORELINE. VISIBILITY MAY DROP BELOW ONE-HALF MILE AT TIMES. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ BEACHLER
785 WWUS43 KLOT 251001 WSWLOT URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE CHICAGO IL 401 AM CST FRI FEB 25 2011 INZ010-011-019-251500- /O.CON.KLOT.WS.W.0002.000000T0000Z-110225T1500Z/ NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...MOROCCO...RENSSELAER...FOWLER 401 AM CST FRI FEB 25 2011 /501 AM EST FRI FEB 25 2011/ ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ THIS MORNING... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ THIS MORNING. * TIMING...PRECIPITATION WILL CONTINUE TO MOVE EAST EARLY THIS MORNING. * ACCUMULATIONS...STORM TOTAL ACCUMULATIONS OF 3 TO 7 INCHES ARE LIKELY....WITH SNOW TAPERING OFF TO FLURRIES BY DAYBREAK. * HAZARDS...HEAVY SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH CAUSING BLOWING AND DRIFTING OF SNOW. VISIBILITY OCCASIONALLY BELOW ONE-HALF MILE. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. && $$ ILZ019>023-032-033-039-INZ001-002-251500- /O.CON.KLOT.WW.Y.0006.000000T0000Z-110225T1500Z/ LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD- LAKE IN-PORTER- INCLUDING THE CITIES OF...OTTAWA...OSWEGO...MORRIS...JOLIET... KANKAKEE...PONTIAC...WATSEKA...PAXTON...GARY...VALPARAISO 401 AM CST FRI FEB 25 2011 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS MORNING... A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS MORNING. * TIMING...SNOW WILL CONTINUE TO TAPER OFF TO FLURRIES THIS MORNING. * ACCUMULATIONS...FURTHER ACCUMULATIONS WILL BE LIGHT AND LESS THAN ONE HALF OF AN INCH. * HAZARDS...SNOW. NORTH TO NORTHEAST WINDS GUSTING TO 25 TO 30 MPH MAY PRODUCE AREAS OF BLOWING AND DRIFTING SNOW. * IMPACTS...SNOW COVERED ROADS WILL MAKE TRAVEL DIFFICULT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ SHEA
506 WWUS43 KLOT 251145 WSWLOT URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE CHICAGO IL 545 AM CST FRI FEB 25 2011 ILZ019>023-032-033-039-251245- /O.CAN.KLOT.WW.Y.0006.000000T0000Z-110225T1500Z/ LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD- INCLUDING THE CITIES OF...OTTAWA...OSWEGO...MORRIS...JOLIET... KANKAKEE...PONTIAC...WATSEKA...PAXTON 545 AM CST FRI FEB 25 2011 ...WINTER WEATHER ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN CHICAGO HAS CANCELLED THE WINTER WEATHER ADVISORY. ACCUMULATING SNOW HAS COME TO AN END ACROSS NORTHEASTERN ILLINOIS WITH ONLY FLURRIES LINGERING. $$ INZ010-011-019-251500- /O.CON.KLOT.WS.W.0002.000000T0000Z-110225T1500Z/ NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...MOROCCO...RENSSELAER...FOWLER 545 AM CST FRI FEB 25 2011 /645 AM EST FRI FEB 25 2011/ ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ THIS MORNING... A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM CST /10 AM EST/ THIS MORNING. * TIMING...PRECIPITATION WILL CONTINUE TO MOVE EAST EARLY THIS MORNING. * ACCUMULATIONS...STORM TOTAL ACCUMULATIONS OF 3 TO 7 INCHES ARE LIKELY....WITH SNOW TAPERING OFF TO FLURRIES BY DAYBREAK. * HAZARDS...HEAVY SNOW. NORTH TO NORTHEAST WINDS GUSTING TO AROUND 25 MPH CAUSING BLOWING AND DRIFTING OF SNOW. VISIBILITY OCCASIONALLY BELOW ONE-HALF MILE. * IMPACTS...SNOW COVERED ROADS. RAPID SNOW ACCUMULATION MAY RESULT IN VERY TREACHEROUS ROAD CONDITIONS AND MAKE SNOW REMOVAL DIFFICULT AT TIMES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT... FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY. && $$ INZ001-002-251500- /O.CON.KLOT.WW.Y.0006.000000T0000Z-110225T1500Z/ LAKE IN-PORTER- INCLUDING THE CITIES OF...GARY...VALPARAISO 545 AM CST FRI FEB 25 2011 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS MORNING... A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS MORNING. * TIMING...SNOW WILL CONTINUE TO TAPER OFF TO FLURRIES THIS MORNING. * ACCUMULATIONS...FURTHER ACCUMULATIONS WILL BE LIGHT AND LESS THAN ONE HALF OF AN INCH. * HAZARDS...SNOW. NORTH TO NORTHEAST WINDS GUSTING TO 25 TO 30 MPH MAY PRODUCE AREAS OF BLOWING AND DRIFTING SNOW. * IMPACTS...SNOW COVERED ROADS WILL MAKE TRAVEL DIFFICULT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. && $$ SHEA
113 WWUS43 KLOT 251250 WSWLOT URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE CHICAGO IL 650 AM CST FRI FEB 25 2011 INZ010-011-019-251400- /O.CAN.KLOT.WS.W.0002.000000T0000Z-110225T1500Z/ NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...MOROCCO...RENSSELAER...FOWLER 650 AM CST FRI FEB 25 2011 /750 AM EST FRI FEB 25 2011/ ...WINTER STORM WARNING IS CANCELLED... THE NATIONAL WEATHER SERVICE IN CHICAGO HAS CANCELLED THE WINTER STORM WARNING. SNOW IS TAPERING OFF AND THE THREAT OF ANY SIGNIFICANT ACCUMULATION HAS ENDED. $$ INZ001-002-251400- /O.CAN.KLOT.WW.Y.0006.000000T0000Z-110225T1500Z/ LAKE IN-PORTER- INCLUDING THE CITIES OF...GARY...VALPARAISO 650 AM CST FRI FEB 25 2011 ...WINTER WEATHER ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN CHICAGO HAS CANCELLED THE WINTER WEATHER ADVISORY. SNOW IS TAPERING OFF AND THE THREAT OF ANY SIGNIFICANT ACCUMULATION HAS ENDED. $$ IZZI
What forecasters said that day
The local office's own words before this winter storm 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 winter storm warning went out at Feb 24, 5:09 AM EST, 3 minutes earlier.
Area forecast discussion, Feb 24, 5:09 AM EST, 3 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
409 AM CST THU FEB 24 2011
.DISCUSSION...
352 AM CST
WILL BE BOOSTING THE WINTER STORM WATCH TO A WARNING IN OUR SOUTHERN
TWO ROWS OF COUNTIES FOR TONIGHT...AND STARTING A WINTER WEATHER
ADVISORY FOR THE REST OF THE AREA.
THE CHALLENGE WITH THIS SYSTEM HAS BEEN DETERMINING SNOWFALL
AMOUNTS. MODELS HAVE BEEN JUMPING AROUND A BIT ON QPF...AND COBB
SNOW RATIOS HAVE BEEN SIMILARLY UNSTEADY. LATEST ECMWF AND GFS QPF
FIELDS ACTUALLY LINE UP PRETTY WELL...AND THE NAM MATCHES THE
GENERAL IDEA. OUR SOUTHERN COUNTIES WHERE MODELS ARE SHOWING GREATER
QPF TOTALS LIKELY WILL SEE SMALLER SNOW TO LIQUID RATIOS. FARTHER
NORTH TOWARD THE WISCONSIN LINE THE MIDLEVEL FORCING IS MUCH GREATER
AND THE ZONE FOR FAVORABLE SNOW GROWTH APPEARS TO BE QUITE A BIT
DEEPER...BUT LIQUID TOTALS ARE MUCH LOWER. WE MAY END UP WITH TWO
SEPARATE SWATHS OF HIGHER SNOWFALL AMOUNTS...ONE TO OUR SOUTH WHERE
LIQUID QPF IS HIGHEST AND ONE FROM THE LASALLE AREA INTO LAKE AND
COOK COUNTIES WHERE THE HIGHER QPF AMOUNTS TAP INTO THE BETTER
MIDLEVEL FORCING.
IN COORDINATION WITH THE DVN AND MKX OFFICES THE ADVISORY FOR KLOT
WILL COVER OUR ENTIRE CWA. THERE IS THE POSSIBILITY THAT PART OF
THIS AREA MAY YET NEED TO BE UPGRADED TO A WARNING...PERHAPS NOT
CONTIGUOUS TO THE FIRST WARNING...WHILE PART MAY SEE SNOW TOTALS
CLOSER TO 2-3 INCHES. DESPITE THE UNCERTAINTY...A REASON FOR
EXTENDING IT TO THE CWA BORDERS THIS SOON...APART FROM THE
WIDESPREAD 3-4 INCH AMOUNTS WE ARE ANTICIPATING...WAS TO ALLOW
FLEXIBILITY AND AVOID GAPS LATER IF DVN AND MKX WISH TO ADD
HEADLINES TO ADDITIONAL COUNTIES.
OVERALL THIS WILL BE A QUICK SHOT OF POTENTIALLY HEAVY SNOW...WITH
RATES AT TIMES GREATER THAN AN INCH PER HOUR. BY 12Z FRIDAY THINGS
SHOULD START WINDING DOWN...BUT THE COMMUTE FRIDAY MORNING LIKELY
WILL NOT BE EASY IN SOME AREAS...AND BLOWING SNOW MAY CAUSE
ADDITIONAL PROBLEMS.
LENNING
FOR THE LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY...
ZONAL FLOW TO START THE PERIOD WITH A SERIES OF H5 SHORTWAVE TROUGHS
TRANSITING ACROSS THE REGION. FIRST TROUGH PASSES THROUGH THE REGION
DURING THE DAY SATURDAY. WHILE MAIN FORCING SEEMS TO BE ASSOCIATED
WITH THE UPPER LEVEL SHORTWAVE...NAM AND ECMWF BOTH DEVELOP A
SURFACE TROUGH THAT ACTS AS FOCUS FOR PRECIPITATION. ALL IN
ALL...PRECIPITATION TOTALS WITH THIS SYSTEM WILL BE VERY LIGHT.
A MORE SIGNIFICANT SYSTEM MOVES ONSHORE OVER SOUTHERN CALIFORNIA AND
CLOSES OFF AS IT DEEPENS AND PROGRESSES EAST ACROSS THE SOUTHWEST
CONUS. A SURFACE LOW BEGINS TO DEVELOP OVER COLORADO ON
SUNDAY...QUICKLY MOVING EAST-NORTHEAST ACROSS THE MIDWEST ON MONDAY.
IT SHOULD BE NOTED THAT CONSIDERING THIS SYSTEM IS STILL OVER THE
PACIFIC AND WILL DEVELOP INTO AN UPPER CLOSED LOW...THERE IS A GREAT
DEAL OF UNCERTAINTY IN ITS EVOLUTION...AND THE DETAILS OF THE
FORECAST DONT COME WITH MUCH CONFIDENCE AT THIS POINT.
MODELS SUGGEST A FAIRLY STRONG LOW LEVEL JET FORMING AHEAD OF THE
LOW WHICH WILL ACT TO TIGHTEN THE BAROCLINIC ZONE AS WELL AS
INTRODUCE A THREAT FOR THUNDERSTORMS AS HIGH THETA-E AIR IS ADVECTED
NORTHWARD. EXPECT PRECIPITATION TO BEGIN SOMETIME SUNDAY AS STRONG
ISENTROPIC LIFT SETS UP ACROSS THE REGION. MUCH ATTENTION WILL BE
GIVEN TO THE MODEL TRENDS ON THE LOW TRACK IN THE COMING DAYS. AS
FAR AS TONIGHTS GUIDANCE...12 AND 00Z ECMWF RUNS TAKE THE SURFACE
LOW TRACK ACROSS CENTRAL ILLINOIS. 00Z GFS COMES IN FASTER AND TAKES
THE TRACK OVER NORTHERN ILLINOIS. GEM IS EVEN FASTER WITH A SIMILAR
ALBEIT SLIGHTLY MORE SOUTHERLY TRACK THAN THE GFS. LATEST MODEL
SUITES DID COME IN A BIT WARMER OVERALL LEANING TOWARDS MORE OF A
RAIN EVENT...SO TRENDED THE MIXED PRECIP AREA FARTHER NORTH. ONCE
SYSTEM DEPARTS TO THE EAST...COULD SEE RAIN CHANGE TO SNOW PRETTY
QUICKLY ACROSS THE REMAINDER OF THE FORECAST AREA...BUT EXPECT
PRECIPITATION TO BEGIN TO TAPER BY THIS POINT. H85 TEMPS PLUMMET TO
LESS THAN -10C...AND SURFACE TEMPERATURES OVERNIGHT MONDAY NIGHT
COULD FALL INTO THE TEENS ACROSS THE FORECAST AREA.
NORTHWEST FLOW IS EXPECTED TO DOMINATE THE REMAINDER OF THE WEEK
KEEPING TEMPERATURES A LITTLE BELOW NORMAL. CONDITIONS WILL
GENERALLY BE DRY EXCEPT FOR THE POSSIBILITY OF WEAKLY FORCED
PRECIPITATION FROM TRANSIENT SHORTWAVES.
BMD
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 10Z...
* PERIOD OF IFR VISIBILITIES AND LIFR CIGS RAPIDLY IMPROVING TO
LOW MVFR OVER THE NEXT HOUR AS A COLD FRONT SWEEPS THROUGH.
* TIMING OF SNOW AND THE POTENTIAL FOR IFR CONDITIONS AGAIN LATER
THIS EVENING AND TONIGHT.
KJB
//DISCUSSION...UPDATED 06Z...
IFR CIGS/VIS SETTING IN ACROSS THE REGION WITH DRIZZLE/FREEZING
DRIZZLE EXPECTED TO CONTINUE THE NEXT COUPLE OF HOURS THROUGH
AROUND 10Z. THEREAFTER...A COLD FRONT WILL PUSH ACROSS THE AREA.
CIGS AND VISIBILITIES SHOULD IMPROVE SOME BEHIND THIS FRONT. I
EXPECT CIGS TO RISE TO LOW MVFR (1000 TO 1500 AGL) AFTER 10 UTC
AND VISIBILITIES SHOULD IMPROVE ABOVE 3 MILES.
WINDS WILL SHIFT TO NORTHEASTERLY AND BECOME GUSTY BY THURSDAY
AFTERNOON AS A LOW PRESSURE SYSTEM MOVES EASTWARD TOWARDS THE
OHIO VALLEY. SNOW FROM THIS SYSTEM IS EXPECTED TO BEGIN THURSDAY
NIGHT FOR THE CHICAGO AREA TERMINALS WITH SOME ENHANCEMENT FROM
THE LAKE POSSIBLE OVERNIGHT...THOUGH NOT OVERLY CONCERNED WITH THE
LAKE COMPONENT AT THIS POINT SINCE INVERSION HEIGHTS LOOK
MARGINAL. ON THE OTHER HAND...MODELS INDICATE A PERIOD OF STRONG
LIFT WITH A DEEP SNOW GROWTH ZONE INDICATING THE POTENTIAL FOR A
PERIOD OF MODERATE SNOWFALL. TOTAL SNOW ACCUMULATIONS WITH THIS
SYSTEM EXPECTED TO BE IN THE 2 TO 5 INCH RANGE FOR THE CHICAGO
AREA TERMINALS...AND 1 TO 3 INCHES NEAR RFD.
KJB/BMD
//ORD AND MDW CONFIDENCE...UPDATED 10Z...
* HIGH CONFIDENCE IN LIFR CONDITIONS IMPROVING TO LOW MVFR IN THE
NEXT HOUR.
* MEDIUM CONFIDENCE ON TIMING OF SNOWFALL TONIGHT.
KJB
//OUTLOOK FOR ORD/MDW FOR 12Z FRIDAY-12Z WEDNESDAY...UPDATED 00Z...
FRIDAY...CHANCE OF SNOW WITH IFR POSSIBLE EARLY...IMPROVING
CONDITIONS LATE.
SATURDAY...CHANCE OF SNOW. POSSIBLE MVFR.
SUNDAY...MVFR CONDITIONS POSSIBLE.
MONDAY...CHANCE OF RAIN OR SNOW. MVFR CONDITIONS WITH IFR POSSIBLE.
TUESDAY...VFR.
BMD
&&
.MARINE...
300 AM CST
A WEAK COLD FRONT EXTENDING FROM CENTRAL ONTARIO S ACROSS WI AND
IL WILL MOVE E ACROSS LAKE MI EARLY THIS MORNING SHIFTING WINDS
FROM SW TO NW AND EVENTUALLY TO N.
WITH HIGH PRES BUILDING SE FROM ALBERTA ACROSS THE NORTHERN
PLAINS AND UPPER MIDWEST TODAY WHILE LOW PRES DEEPENS AS IT MOVES
FROM WESTERN OK TO THE OZARKS WINDS ON LAKE MI WILL RESPOND BE
VEERING FURTHER TO NE AND INCREASING TO 25-30 KT ON THE S 2/3RDS
OF THE LAKE OVERNIGHT AS THE LOW TRACKS UP THE OH VALLEY. WIND
AND WAVE CONDITIONS WILL REACH SMALL CRAFT ADVISORY THRESHOLDS BY
LATE THIS EVENING.
N WINDS WILL GRADUALLY DIMINISH FRI AS THE LOW MOVES OFF ACROSS
THE NE STATES AND NEW ENGLAND AND HIGH PRESS SETTLES OVER CENTRAL
NORTH AMERICA.
STRONG LOW PRESSURE WILL MOVE NE INTO THE MID MS VALLEY
SUN AND CONTINUE TO DEEPEN MON AS IT LIFTS NE THROUGH THE CENTRAL
GREAT LAKES. THIS STORM SYSTEM IS EXPECTED TO PRODUCE GALE FORCE
WINDS FOR LAKE MI DURING MON DUE TO THE STRENGTH OF THE LOW.
TRS
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...WINTER STORM WARNING...ILZ032-ILZ033-ILZ039...6 PM THURSDAY TO 9
AM FRIDAY.
WINTER WEATHER ADVISORY...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-
ILZ010-ILZ011-ILZ012-ILZ013-ILZ014-ILZ019-ILZ020-ILZ021-
ILZ022-ILZ023...6 PM THURSDAY TO 9 AM FRIDAY.
IN...WINTER WEATHER ADVISORY...INZ001-INZ002...6 PM THURSDAY TO 9 AM
FRIDAY.
WINTER STORM WARNING...INZ010-INZ011-INZ019...6 PM THURSDAY TO 9
AM FRIDAY.
LM...NONE.
&&Hazardous weather outlook, Feb 23, 5:25 PM EST, 11 hours 47 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 425 PM CST WED FEB 23 2011 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 242230- 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- 425 PM CST WED FEB 23 2011 /525 PM EST WED FEB 23 2011/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. SCATTERED LIGHT PRECIPITATION WILL OCCUR ACROSS THE AREA INTO TONIGHT. A MIX OF LIGHT SNOW AND SLEET MAY OCCUR AS PRECIPITATION STARTS INTO EARLY EVENING WITH LIGHT RAIN AND LIGHT FREEZING RAIN EXPECTED THIS EVENING GENERALLY NORTHEAST OF A LINE FROM OREGON ILLINOIS TO VALPARAISO INDIANA WITH RAIN EXPECTED SOUTHWEST OF THIS LINE. FREEZING PRECIPITATION MAY CHANGE TO RAIN LATE THIS EVENING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. A WINTER STORM DEVELOPING ACROSS THE SOUTHERN PLAINS IS EXPECTED TO BRING SIGNIFICANT SNOW TO PORTIONS OF EAST CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA THURSDAY EVENING INTO FRIDAY MORNING. A SHORT PERIOD OF RAIN..SLEET...AND SNOW IS POSSIBLE AS PRECIPITATION STARTS. SIGNIFICANT SNOW ACCUMULATION IS POSSIBLE ALONG AND SOUTH OF INTERSTATE 88 WITH THE HEAVIEST AMOUNTS ALONG AND SOUTH OF INTERSTATE 80. NORTHEAST WINDS WILL BRING BLOWING AND DRIFTING OF SNOW. ANOTHER WINTER STORM MAY TRACK NEAR OR OVER THE AREA SUNDAY NIGHT INTO MONDAY...BUT AT THIS TIME THERE IS MUCH UNCERTAINTY REGARDING THE DETAILS OF THIS SYSTEM. THE ADDITIONAL PRECIPITATION MAY LEAD TO ADDITIONAL FLOODING ON LOCAL RIVERS AND STREAMS. PORTIONS OF THE DES PLAINES AND ILLINOIS RIVERS WILL REMAIN IN FLOOD...AND PORTIONS OF THE PECATONICA RIVER WILL REMAIN NEAR OR ABOVE ACTION STAGE. HOWEVER MOST OF THE RIVER LEVELS HAVE CRESTED AND ARE SLOWLY FALLING. RUNOFF FROM SNOW MELT AND RAINFALL...COMBINED WITH RECENT ABOVE FREEZING TEMPERATURES...HAVE RESULTED IN INCREASED STREAMFLOW AND AN ELEVATED RISK OF LOCALIZED ICE JAM FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-242230- 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- 425 PM CST WED FEB 23 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. STRONG WINDS AND HIGH WAVES MAY LEAD TO HAZARDOUS CONDITIONS FOR SMALL CRAFT ALONG THE ILLINOIS AND INDIANA SHORES OF LAKE MICHIGAN THURSDAY NIGHT THROUGH FRIDAY AFTERNOON OR EVENING. && 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- 870-872-874-876-878-242230- 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- 425 PM CST WED FEB 23 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO MDB
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 24, 5:12 AM EST | Winter Weather Advisory | LOT | Lake, Porter | 27 hr |
| Feb 24, 11:19 AM EST | Small Craft Advisory | LOT | 32 hr |
Nearby
Winter Storm Warnings in Indiana, 2011Winter Storm Warnings in Illinois, 2011Every winter storm warning in 2011
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.