Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 27, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at May 6, 2012, 9:55 PM CDT for Grundy County, Kankakee County, Will County, Illinois. It was in force for 50 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
- May 6, 2012, 9:55 PM CDT (02:55 UTC)
- Expired
- May 6, 2012, 10:45 PM CDT
- In force
- 50 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Grundy County, IL, Kankakee County, IL, Will County, IL
The radar
The Chicago radar (KLOT), 33 km from the middle of the area, began a volume at 02:55 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 2.9 hours before the alert went out and 135 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
- 1208 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 1947 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
089 WUUS53 KLOT 070255 SVRLOT ILC063-091-197-070345- /O.NEW.KLOT.SV.W.0027.120507T0255Z-120507T0345Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 955 PM CDT SUN MAY 6 2012 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN GRUNDY COUNTY IN NORTHEAST ILLINOIS... NORTHWESTERN KANKAKEE COUNTY IN NORTHEAST ILLINOIS... SOUTHWESTERN WILL COUNTY IN NORTHEAST ILLINOIS... * UNTIL 1045 PM CDT * AT 950 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR COAL CITY...OR 7 MILES SOUTHEAST OF MORRIS...AND MOVING EAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... COAL CITY AND BRACEVILLE AROUND 1000 PM CDT. DIAMOND AROUND 1005 PM CDT. BRAIDWOOD AROUND 1010 PM CDT. WILMINGTON AND LAKEWOOD SHORES AROUND 1025 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 4143 8800 4115 8799 4120 8844 4138 8845 TIME...MOT...LOC 0252Z 267DEG 14KT 4129 8832 WIND...HAIL <50MPH 1.00IN $$ BIRK
5 follow-up statements
999 WWUS53 KLOT 070304 SVSLOT SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1004 PM CDT SUN MAY 6 2012 ILC063-091-197-070345- /O.CON.KLOT.SV.W.0027.000000T0000Z-120507T0345Z/ KANKAKEE IL-WILL IL-GRUNDY IL- 1004 PM CDT SUN MAY 6 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL GRUNDY...SOUTHWESTERN WILL AND NORTHWESTERN KANKAKEE COUNTIES UNTIL 1045 PM CDT... AT 959 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM WILMINGTON TO COAL CITY...MOVING EAST AT 20 MPH. SEVERE THUNDERSTORMS WILL BE NEAR... ELWOOD...COAL CITY AND BRACEVILLE AROUND 1010 PM CDT. DIAMOND AROUND 1015 PM CDT. BRAIDWOOD AROUND 1020 PM CDT. WILMINGTON AROUND 1035 PM CDT. LAKEWOOD SHORES AROUND 1040 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 4143 8800 4115 8799 4120 8844 4138 8845 TIME...MOT...LOC 0305Z 268DEG 13KT 4135 8813 4129 8830 WIND...HAIL <50MPH 1.00IN $$ BIRK
263 WWUS53 KLOT 070314 SVSLOT SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1014 PM CDT SUN MAY 6 2012 ILC063-091-197-070345- /O.CON.KLOT.SV.W.0027.000000T0000Z-120507T0345Z/ KANKAKEE IL-WILL IL-GRUNDY IL- 1014 PM CDT SUN MAY 6 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL GRUNDY...SOUTHWESTERN WILL AND NORTHWESTERN KANKAKEE COUNTIES UNTIL 1045 PM CDT... AT 1009 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM ELWOOD TO COAL CITY...MOVING EAST AT 20 MPH. SEVERE THUNDERSTORMS WILL BE NEAR... BRAIDWOOD AROUND 1020 PM CDT. WILMINGTON AROUND 1030 PM CDT. LAKEWOOD SHORES AROUND 1040 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. && LAT...LON 4131 8844 4143 8800 4115 8799 4120 8844 TIME...MOT...LOC 0314Z 268DEG 13KT 4135 8809 4129 8826 WIND...HAIL <50MPH 1.00IN $$ ENDERLEN
601 WWUS53 KLOT 070325 SVSLOT SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1025 PM CDT SUN MAY 6 2012 ILC063-091-197-070345- /O.CON.KLOT.SV.W.0027.000000T0000Z-120507T0345Z/ KANKAKEE IL-WILL IL-GRUNDY IL- 1025 PM CDT SUN MAY 6 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL GRUNDY...SOUTHWESTERN WILL AND NORTHWESTERN KANKAKEE COUNTIES UNTIL 1045 PM CDT... AT 1023 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 5 MILES SOUTHEAST OF ELWOOD TO COAL CITY...MOVING EAST AT 20 MPH. SEVERE THUNDERSTORMS WILL BE NEAR... DIAMOND AROUND 1030 PM CDT. BRAIDWOOD AROUND 1035 PM CDT. LAKEWOOD SHORES AND WILMINGTON AROUND 1045 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. && LAT...LON 4131 8844 4143 8800 4115 8799 4120 8844 TIME...MOT...LOC 0324Z 268DEG 13KT 4135 8804 4129 8827 WIND...HAIL <50MPH 1.00IN $$ ENDERLEN
467 WWUS53 KLOT 070336 SVSLOT SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1036 PM CDT SUN MAY 6 2012 ILC063-091-197-070345- /O.CON.KLOT.SV.W.0027.000000T0000Z-120507T0345Z/ KANKAKEE IL-WILL IL-GRUNDY IL- 1036 PM CDT SUN MAY 6 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL GRUNDY...SOUTHWESTERN WILL AND NORTHWESTERN KANKAKEE COUNTIES UNTIL 1045 PM CDT... AT 1032 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES NORTHEAST OF LAKEWOOD SHORES TO DIAMOND...MOVING EAST AT 20 MPH. SEVERE THUNDERSTORMS WILL BE NEAR... LAKEWOOD SHORES AROUND 1045 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. && LAT...LON 4131 8844 4143 8800 4115 8799 4120 8844 TIME...MOT...LOC 0337Z 268DEG 13KT 4131 8800 4129 8821 WIND...HAIL <50MPH 1.00IN $$ ENDERLEN
682 WWUS53 KLOT 070343 SVSLOT SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1043 PM CDT SUN MAY 6 2012 ILC063-091-197-070353- /O.EXP.KLOT.SV.W.0027.000000T0000Z-120507T0345Z/ KANKAKEE IL-WILL IL-GRUNDY IL- 1043 PM CDT SUN MAY 6 2012 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL GRUNDY... SOUTHWESTERN WILL AND NORTHWESTERN KANKAKEE COUNTIES WILL EXPIRE AT 1045 PM CDT... THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED AND MOVED OUT OF THE WARNED AREA...HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THESE THUNDERSTORMS. LAT...LON 4131 8844 4143 8800 4115 8799 4120 8844 TIME...MOT...LOC 0343Z 268DEG 13KT 4131 8797 4129 8818 $$ ENDERLEN
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 May 6, 7:46 PM CDT, 2 hours 9 minutes earlier.
Area forecast discussion, May 6, 7:46 PM CDT, 2 hours 9 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
746 PM CDT SUN MAY 6 2012
.DISCUSSION...
743 PM CDT
MESOSCALE UPDATE...
CLUSTER OF SEVERE THUNDERSTORMS WHICH HAD FORMED ALONG WARM FRONTAL
BOUNDARY DURING THE AFTERNOON HAVE MOVED SOUTHEAST OF THE CWA AS OF
645 PM CDT. OUTFLOW BOUNDARY FROM THIS CLUSTER OF STORMS HAS PUSHED
THE EFFECTIVE SURFACE FRONT SOUTH OF THE CWA...TO AN APPROXIMATELY
GALESBURG...PEORIA...SOUTH OF CHAMPAIGN LINE PER RADAR FINE LINE
ECHO AND METAR OBSERVATIONS. FARTHER WEST...THE FRONT THEN EXTENDS
WEST INTO FAR SOUTHEAST IOWA TO A 1008 MB AREA OF SURFACE LOW
PRESSURE. ALOFT...SIGNIFICANT ELEVATED CAPE APPEARS TO BE PRESENT
STILL ACROSS EASTERN IA/NORTHERN IL PER SPC RAP OBJECTIVE ANALYSIS
FIELDS...AND INDEED THE 00Z RAOB FROM DVN AND RECENT AMDAR ASCENT
SOUNDINGS FROM ORD INDICATE LITTLE INHIBITION AND IN EXCESS OF 2000
J/KG FOR PARCELS FORCED FROM AROUND 900 MB. SURFACE/NEAR SURFACE
INSTABILITY REMAINS ALONG/SOUTH OF SURFACE FRONT PARTICULARLY FROM
SOUTHEAST IA/NORTHEAST MO INTO WEST CENTRAL IL WITH 3000 J/KG MLCAPE
ANALYZED IN SPC/RAP.
IN THE NEAR TERM...NEXT 1-2 HOURS...THE FORECAST AREA APPEARS TO BE
SOMEWHAT BETWEEN AREAS OF LARGER SCALE FORCING FOR ASCENT. ANALYSIS
OF LATE AFTERNOON PROFILER/VWP DATA SUGGESTS ONE MID-LEVEL SHORT
WAVE TROUGH AND ASSOCIATED 35 KT MID-LEVEL SPEED MAXIMA TRANSLATING
EAST ACROSS NORTHERN INDIANA AND LOWER MICHIGAN...WHILE ANOTHER WAS
LOCATED UPSTREAM ACROSS THE LOWER MISSOURI RIVER VALLEY REGION OF
WESTERN MO/SOUTHWEST IA WHERE ADDITIONAL CLUSTERS OF CONVECTION WERE
NOTED PER SATELLITE/RADAR/LIGHTNING DATA. ISOLATED THUNDERSTORMS
WERE DEVELOPING HOWEVER ACROSS FAR SOUTHEAST IOWA...IN
AFOREMENTIONED LOW LEVEL CAPE MAXIMA WHICH ALSO COINCIDES WITH
LOWEST ANALYZED LFC HEIGHTS. WEAK BUT PERSISTENT WARM/MOIST ASCENT
ATOP THE LOW LEVEL BOUNDARY/FRONT AND FALLING SURFACE PRESSURES
ACROSS WESTERN IL SUGGEST THIS CONVECTIVE ACTIVITY MAY EXPAND IN
COVERAGE OVER THE NEXT FEW HOURS...AND WILL LIKELY SPREAD BACK INTO
THE WEST/SOUTH PORTIONS OF THE CWA DURING THE MID-LATE EVENING HOURS
AS LOWER MISSOURI VALLEY SHORT WAVE APPROACHES FROM THE SOUTHWEST.
OTHER ELEVATED STORMS ACROSS SOUTHERN WI/LAKE MICHIGAN APPEAR TO BE
ASSOCIATED WITH CONVERGENT AXIS NOTED IN 925-850 MB VWP/PROFILER
ANALYSIS WHERE STRONGER SOUTH/SOUTHEAST FLOW IS NOTED... BUT WE MAY
SEE SOME OF THIS FILL BACK TO THE SOUTHWEST AS OVERALL FORCING FOR
DEEP ASCENT BECOMES MORE FAVORABLE BACK ACROSS WESTERN ILLINOIS.
DECREASING MID-LEVEL FLOW AND RESULTING DEEP LAYER SHEAR WILL LIKELY
REDUCE THE OVERALL SEVERE THREAT ACROSS THE AREA...WITH AREAS
CLOSER TO THE SURFACE WARM FRONT AND OUTFLOW BOUNDARIES IN THE FAR
SOUTH/SOUTHWEST CWA PERHAPS ABLE TO MAINTAIN SOME MINIMAL THREAT FOR
HAIL/DAMAGING WINDS FOR STORMS ROOTED CLOSER TO THE SURFACE/BOUNDARY
LAYER. OTHERWISE THE MAIN THREATS INTO THE OVERNIGHT HOURS FOCUS ON
THE POTENTIAL FOR ADDITIONAL HEAVY RAINFALL...PARTICULARLY WHERE
PREVIOUS STORMS HAVE PRODUCED VERY HEAVY RAINFALL SOUTH OF I-80 THIS
AFTERNOON. AXIS OF VERY MOIST 925-850 MB LAYER WITH DEW POINTS 16-20
DEG C...PWATS OF 1.5-1.8...DIFFLUENT DEEP LAYER THICKNESS FIELD
ACROSS THE SOUTHEAST CWA...AND APPROACHING SHORT WAVE ALL POINT TO
CONTINUED HEAVY RAIN THREAT.
BASED ON ABOVE...AND IN COORDINATION WITH SPC AND WFO ILX...WILL GO
AHEAD AND CANCEL SEVERE THUNDERSTORM WATCH 258 AT THIS TIME BUT
WILL MAINTAIN FLASH FLOOD WATCH.
RATZER
&&
.MESOSCALE DISCUSSION...
358 PM CDT
ONGOING CONVECTION ACROSS THE SOUTHERN FORECAST AREA IS ROOTED
ALONG THE SURFACE SYNOPTIC BOUNDARY AS WELL AS NEAR AN OLD OUTFLOW
BOUNDARY FROM MORNING CONVECTION. A TIGHT SURFACE BASED
INSTABILITY GRADIENT EXISTS IN THIS AREA...WITH NEARLY 4000 J/KG
OF UNINHIBITED CAPE TO THE IMMEDIATE SOUTH. REPORTS OF WALL
CLOUDS/LOWERING ROTATION HAVE VERIFIED THESE STORMS ARE ROOTED
LOW...ESPECIALLY IN THE DISCRETE SUPERCELLULAR STORMS WITHIN THIS
DEVELOPING COMPLEX. THE TORNADO THREAT IS ENHANCED IN THIS
ISOLATED AREA FROM THE PANHANDLE OF LASALLE COUNTY THROUGH
SOUTHERN NEWTON COUNTY AND SOUTHWARD...BY A POOL OF OVER 100 J/KG
OF 0-3 KM MLCAPE...AS WELL AS BACKED LOW-LEVEL MOIST INFLOW.
THERE WILL CONTINUE TO BE A TORNADO AND LARGE HAIL THREAT WITH ANY
OF THESE MORE DISCRETE STORMS...BUT A PRIMARY HEAVY RAIN THREAT IN
THIS AREA AND POTENTIALLY A DEVELOPING WIND THREAT AS A COLD POOL
ORGANIZES AND CELL MERGERS OCCUR. THE RAINFALL RATES WITH THESE
STORMS ARE VERY HEAVY AND PROPORGATION IS SLOW...WITH ANALYZED
PROPAGATION VECTORS INDICATING A GRADUAL EAST DRIFT.
MTF
&&
.PREV DISCUSSION...
358 PM CDT
FORECAST CONCERNS HAVE BEEN CENTERED ON THE SHORT TERM...FROM NOW
THROUGH MONDAY WITH ONGOING CONVECTIVE AND HEAVY RAIN THREAT.
TONIGHT...A VERY CHALLENGING FORECAST AS ONGOING CONVECTION MAY
ALTER THE ATMOSPHERE ENOUGH TO HAVE A MAJOR IMPACT ON HOW
WIDESPREAD THE ACTIVITY TONIGHT MAY BE. IN GENERAL...THE TREND
WITH THE FORECAST WAS TO FOCUS THE HIGHER RAINFALL AMOUNTS FOR
TONIGHT FURTHER SOUTH IN THE FORECAST AREA...MAINLY SOUTH OF
INTERSTATE 88...WITH AN EMPHASIS SOUTH OF INTERSTATE 80.
CONVECTIVE COMPLEX EVOLVING FROM THE LACON AREA EASTWARD TOWARD
JUST SOUTH OF KANKAKEE HAS BEEN VERY SLOW MOVING...AND IS ROOTED
ALONG THE LOW-LEVEL THERMAL BOUNDARY WHERE CONVERGENCE IS
MAXIMIZED. A GRADUAL MCV OR COLD POOL EVOLUTION IS FAVORED...WHICH
SHOULD HELP TO PROGRESS THIS SOUTHEAST. CONTINUED MOISTURE
TRANSPORT INTO THE REGION THROUGH THIS EVENING WILL LIKELY OFFSET
THIS OVERALL MOTION SOME...LEADING TO POTENTIALLY VERY HEAVY
RAINFALL AMOUNTS TOWARD 4-5 INCHES IN PLACES. BULK SHEAR IS
MARGINAL...HOWEVER THE STORMS HAVE ALREADY THIS AFTERNOON SHOWN
THEMSELVES AS BEING ORGANIZED AND ROOTED IN THE SURFACE. SO A
SUSTAINED COLD POOL WILL LIKELY HELP IN POTENTIALLY PRODUCING
WIND...AS WELL AS AN ONGOING HAIL THREAT...ESPECIALLY THIS
EVENING.
TO THE NORTH OF THIS AREA...THE MOISTURE TRANSPORT IS
LESS...HOWEVER SHORT CONTINUED BROAD QG FORCING AND SHORT WAVE
RIPPLES ARE LIKELY TO TRIGGER AT LEAST SOME ELEVATED ACTIVITY.
MUCAPE VALUES ARE DIAGNOSED AT OVER 2000 J/KG PER THE RAP MODEL
BACK INTO NW AND NORTH CENTRAL IL. WHILE THE LOW-LEVEL AIR IS
SOMEWHAT WORKED OVER...THIS UPPER INSTABILITY AND CONTINUE HIGH
PWAT AIR IS ENOUGH TO HAVE HEAVY RAIN WITH A SCATTERED SEVERE
THREAT. HIGH RES MODELS VARY SIGNIFICANTLY ON HOW THIS WILL PAN
OUT. SO HOW WIDESPREAD THE CONVECTION FURTHER NORTH WILL BECOME IS
HIGHLY UNCERTAIN...ESPECIALLY DUE TO THE ONGOING CONVECTION TO THE
SOUTH. A CONTINUED HEAVY RAIN THREAT WILL EXIST WITH ANY
CONVECTION TO THE NORTH AS WELL...SO WILL CONTINUE THE FLASH FLOOD
WATCH ALL THE WAY TO THE WI BORDER.
MONDAY...SOME CONVECTION WILL LIKELY LINGER MONDAY MORNING AND
POSSIBLY EARLY AFTERNOON AS THE SYNOPTIC COLD FRONT EVOLVES EAST.
THE LOW-LEVEL JET FOCUS WILL BE MORE TO THE SOUTHEAST
HOWEVER...SO THE EMPHASIS FOR HEAVY RAIN AND THE SEVERE THREAT
SHOULD BE DIMINISHING. LINGERING CLOUD COVER WILL LIKELY IMPEDE
TEMPERATURES FROM CLIMBING MUCH THROUGH THE MORNING. A STRONGER
NORTHWEST PUSH IS LIKELY IN THE AFTERNOON...AIDING IN SCOURING OF
THE CLOUD COVER.
TUESDAY AND BEYOND...LITTLE CHANGES MADE TO THE GOING FORECAST FOR
THIS PERIOD DUE TO ONGOING SEVERE AND HEAVY RAIN THREATS. THE
POSTIIVELY TITLED UPPER TROUGH CENTERED OVER SOUTHERN MANITOBA
WILL GRADUALLY WORK EAST ACROSS THE WESTERN GREAT LAKES TUESDAY
NIGHT INTO WEDNESDAY...POSSIBLY BRINGING SOME SHOWERS.
MTF
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 00Z...
* THUNDERSTORMS AND LOW CEILINGS POSSIBLE THIS EVENING.
* ONGOING SHOWERS AND LOW CEILINGS TONIGHT INTO TOMORROW.
* VARIABLE WIND DIRECTION THIS EVENING.
LENNING
//DISCUSSION...UPDATED 00Z...
THE BULK OF TSTORM ACTIVITY THIS EVENING IS STAYING SOUTH OF THE
MAIN TERMINALS...BUT ANOTHER LINE IS TRYING TO FORM ACROSS
SOUTHEAST WISCONSIN INTO NORTHWEST ILLINOIS. AIRMASS WOULD APPEAR
TO BE SOMEWHAT FAVORABLE FOR THESE STORMS TO PERSIST...BUT LATEST
RADAR IMAGERY SHOWS DISSIPATION ALONG THE SOUTHERN PART OF THE
LINE. TSRA IN 00Z TAFS WOULD ESTIMATE ARRIVAL TIME IF THE LINE
DOES HOLD TOGETHER. FARTHER WEST AND SOUTH THERE IS ADDITIONAL
ACTIVITY STARTING TO FORM...SO ADDITIONAL TSRA IS POSSIBLE LATER
ON.
LOCAL OBSERVATIONS SHOW WHAT APPEARS TO BE A WAKE LOW DEVELOPING
SOUTH OF THE ORD/MDW TERMINALS...SO WINDS COULD VARY QUITE A BIT
THIS EVENING BUT STAY RELATIVELY LIGHT EXCEPT NEAR STORMS.
LENNING
//ORD AND MDW CONFIDENCE...UPDATED 00Z...
* LOW CONFIDENCE IN TIMING OF TSRA THIS EVENING AND WHETHER IT
EVEN GETS INTO THE TERMINALS.
* LOW CONFIDENCE IN WIND DIRECTION...BUT HIGHER CONFIDENCE IN
STAYING BELOW 10 KTS.
* MEDIUM CONFIDENCE IN CIG/VSBY TRENDS OVERNIGHT INTO MORNING.
LENNING
//OUTLOOK FOR ORD/MDW FOR 12Z TUESDAY-12Z SUNDAY...UPDATED 00Z...
TUESDAY...VFR...SLIGHT CHANCE OF SHOWERS.
WEDNESDAY...VFR...CHANCE OF SHOWERS.
THURSDAY...VFR.
FRIDAY...VFR.
SATURDAY...VFR...CHANCE OF SHOWERS.
LENNING
&&
.MARINE...
256 AM CDT
HIGH PRESSURE CONTINUES TO STRETCH FROM WESTERN HUDSON BAY SOUTHEAST
INTO NORTHERN NEW ENGLAND. LOW PRESSURE CENTERED OVER THE OK/TX
PANHANDLE REGION WILL DRIFT EASTWARD TODAY WITH AN INVERTED TROUGH
STRETCHING TO ITS NORTH. THIS TROUGH AXIS THEN ARCS NORTHWESTWARD TO
A DEVELOPING LOW OVER SOUTHERN SASKATCHEWAN. EASTERLY WINDS WILL
CONTINUE THIS MORNING BEFORE A WARM FRONTAL BOUNDARY SETS UP ACROSS
THE CENTRAL PART OF THE LAKE. THIS WILL ALLOW WINDS ACROSS THE NORTH
TO TURN NORTHEASTERLY AND TO A MORE SOUTHEASTERLY DIRECTION ACROSS
THE SOUTHERN PART OF THE LAKE. THE SURFACE LOW WILL WEAKEN AS IT
CROSSES THE SOUTHERN PART OF THE LAKE MONDAY MORNING. WINDS WILL
TURN NORTHERLY ACROSS THE ENTIRE LAKE AS THE LOW MOVES TO THE EAST
MONDAY AFTERNOON. THE SASKATCHEWAN LOW WILL THEN CROSS THE LAKE AS
MORE OF AN OPEN TROUGH THAN A CLOSED LOW. FAIRLY STRONG HIGH
PRESSURE WILL FOLLOW IN ITS WAKE LEADING TO A PERIOD OF ELEVATED
WINDS WEDNESDAY THANKS TO AN INCREASED PRESSURE GRADIENT. THE HIGH
WILL THEN SLOWLY MOVE EAST ACROSS THE REGION THROUGH THE END OF THE
WEEK KEEPING A NORTHERLY WIND THROUGH THURSDAY WITH A FLIP TO A
SOUTHERLY DIRECTION FRIDAY. THERE IS THEN GOOD AGREEMENT ON A FRONT
CROSSING THE REGION AGAIN SATURDAY WITH ANOTHER AREA OF HIGH
PRESSURE BUILDING IN BEHIND IT.
MDB
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...FLASH FLOOD WATCH...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-
ILZ011-ILZ012-ILZ013-ILZ014-ILZ019-ILZ020-ILZ021-ILZ022-
ILZ023-ILZ032-ILZ033-ILZ039 UNTIL 7 AM MONDAY.
IN...FLASH FLOOD WATCH...INZ001-INZ002-INZ010-INZ011-INZ019 UNTIL 7
AM MONDAY.
LM...NONE.
&&Hazardous weather outlook, May 6, 9:01 PM CDT, 54 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 901 PM CDT SUN MAY 6 2012 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 080215- 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- 901 PM CDT SUN MAY 6 2012 /1001 PM EDT SUN MAY 6 2012/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...SOME MAY PRODUCE... HEAVY RAINFALL...PRODUCING LOCALIZED FLASH FLOODING HAIL TO THE SIZE OF GOLF BALLS WIND GUSTS IN EXCESS OF 60 MPH CLOUD TO GROUND LIGHTNING AREAS AFFECTED AND TIMING: ISOLATED THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS EVENING ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA AND CONTINUE THROUGH THE OVERNIGHT PERIOD. DISCUSSION: VERY MOIST ATMOSPHERE REMAINS OVER NORTHERN ILLINOIS AND NORTHWEST INDIANA THIS EVENING...AND WILL CONTINUE THROUGH THE OVERNIGHT PERIOD. THE MAIN FOCAL POINT FOR ADDITIONAL THUNDERSTORMS TO DEVELOP WILL BE ALONG A FRONTAL BOUNDARY THAT HAS PUSHED SOUTH OF U.S. HIGHWAY 24 OR ALONG AND SOUTH OF A FAIRBURY ILLINOIS TO KENTLAND INDIANA LINE. ISOLATED THUNDERSTORMS ARE EXPECTED TO DEVELOP NORTH OF THIS BOUNDARY THIS EVENING AND MAY STRENGTHEN TO ISOLATED SUPERCELLS. THE THREAT FOR HEAVY RAINFALL IS HIGH WITH THIS ACTIVITY. HIGHER AMOUNTS ARE LIKELY...ESPECIALLY IN SOUTHERN AREAS. LOCALIZED FLASH FLOODING MAY RESULT IN THOSE COMMUNITIES THAT SEE THESE MAXIMUM RAINFALL AMOUNTS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THUNDERSTORMS ARE LIKELY DURING THE DAY ON MONDAY ACROSS A LARGE PORTION OF THE AREA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-080215- 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- 901 PM CDT SUN MAY 6 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS TONIGHT. SOME OF THESE STORMS MAY PRODUCE WIND GUSTS ABOVE 34 KNOTS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THERE IS A CHANCE OF THUNDERSTORMS MONDAY. && 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- 870-872-874-876-878-080215- 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- 901 PM CDT SUN MAY 6 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS TONIGHT...MAINLY ACROSS THE SOUTHERN HALF OF THE LAKE. SOME OF THESE STORMS MAY PRODUCE WIND GUSTS ABOVE 34 KNOTS...MAINLY ACROSS FAR SOUTHERN LAKE MICHIGAN. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THERE IS A CHANCE OF THUNDERSTORMS MONDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO BEACHLER
In the hours before
Local storm report, May 6, 6:25 PM CDT, 3 hours 30 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
625 PM CDT SUN MAY 06 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1025 AM HAIL BELVIDERE 42.25N 88.85W
05/06/2012 E0.50 INCH BOONE IL BROADCAST MEDIA
DIME SIZED HAIL REPORTED BY VIEWER.
1025 AM HAIL BELVIDERE 42.25N 88.85W
05/06/2012 E1.00 INCH BOONE IL COCORAHS
MOSTLY PEA AND SLIGHTLY LARGER - SOME NICKEL-SIZED AND A
FEW QUARTER-SIZED.
1040 AM HAIL BELVIDERE 42.25N 88.85W
05/06/2012 E1.00 INCH BOONE IL PUBLIC
1104 AM HAIL 4 NE LISBON 41.52N 88.43W
05/06/2012 E0.75 INCH KENDALL IL COCORAHS
1110 AM HAIL SUGAR GROVE 41.77N 88.46W
05/06/2012 E0.25 INCH KANE IL TRAINED SPOTTER
2 MILES SW OF AURORA AIRPORT.
1110 AM HAIL 4 W HUNTLEY 42.17N 88.50W
05/06/2012 E0.50 INCH MCHENRY IL COCORAHS
1114 AM HAIL 2 ESE MONTGOMERY 41.72N 88.31W
05/06/2012 E0.25 INCH KENDALL IL TRAINED SPOTTER
PEA SIZED HAIL AT DICKSON AND GALENA ROADS JUST NORTH OF
BRISTOL IL.
1115 AM HEAVY RAIN 4 NE LISBON 41.52N 88.43W
05/06/2012 E0.85 INCH KENDALL IL COCORAHS
0.85 INCH IN 20 MINUTES.
1120 AM HAIL MONTGOMERY 41.73N 88.34W
05/06/2012 E0.25 INCH KANE IL BROADCAST MEDIA
VIEWER REPORT.
1130 AM HAIL FOX RIVER GROVE 42.20N 88.22W
05/06/2012 E0.25 INCH MCHENRY IL TRAINED SPOTTER
SMALLER THAN PEA SIZE HAIL. SOME ROTATION. HEAVY CLOUD TO
GROUND LIGHTNING.
1245 PM HAIL MONEE 41.42N 87.75W
05/06/2012 E0.25 INCH WILL IL TRAINED SPOTTER
1249 PM HEAVY RAIN WAUKEGAN 42.37N 87.87W
05/06/2012 E0.62 INCH LAKE IL TRAINED SPOTTER
0.62 IN AN HOUR.
1250 PM HEAVY RAIN 2 N WAUKEGAN 42.40N 87.87W
05/06/2012 E1.02 INCH LAKE IL COCORAHS
1.02 INCHES IN 40 MINUTES.
0100 PM HAIL PARK FOREST 41.48N 87.69W
05/06/2012 E0.88 INCH COOK IL PUBLIC
0100 PM HEAVY RAIN 2 NNE GURNEE 42.40N 87.92W
05/06/2012 E0.81 INCH LAKE IL COCORAHS
0.81 OF AN INCH SO FAR WITH 0.21 IN 30 MINUTES.
0108 PM HAIL CRETE 41.45N 87.62W
05/06/2012 E0.50 INCH WILL IL TRAINED SPOTTER
DIME-SIZED HAIL.
0115 PM HEAVY RAIN 2 E LAKEMOOR 42.34N 88.17W
05/06/2012 E1.12 INCH LAKE IL COCORAHS
2 MILES SE OF LAKEMOOR...OR 1 MILE SOUTH OF VOLO - 1.12
INCHES IN 60 MINUTES.
0115 PM HEAVY RAIN WINTHROP HARBOR 42.48N 87.83W
05/06/2012 E1.08 INCH LAKE IL COCORAHS
1.08 INCHES IN 60 MINUTES.
0215 PM HEAVY RAIN FOX LAKE 42.42N 88.18W
05/06/2012 E1.70 INCH LAKE IL PUBLIC
STORM TOTAL OF 1.70 INCHES FROM THE MORNING RAINFALL.
0252 PM HAIL CHICAGO 41.88N 87.63W
05/06/2012 E0.88 INCH COOK IL TRAINED SPOTTER
MIXED NICKEL AND DIME SIZE HAIL IN HUMBOLDT PARK.
0320 PM HAIL 13 NW CLIFTON 41.07N 88.11W
05/06/2012 M1.00 INCH KANKAKEE IL TRAINED SPOTTER
INTERSECTION OF COUNTY ROADS 3300 NORTH AND 400 EAST IN
NORTHWEST IROQUOIS COUNTY.
0325 PM HAIL 12 NW CLIFTON 41.06N 88.10W
05/06/2012 M1.75 INCH KANKAKEE IL TRAINED SPOTTER
APPROXIMATELY AT INTERSECTION OF 3200 NORTH AND 400 EAST
IN NORTHWEST IROQUOIS COUNTY.
0329 PM HAIL SW CHEBANSE 41.00N 87.91W
05/06/2012 E0.50 INCH IROQUOIS IL TRAINED SPOTTER
DIME SIZE HAIL SW OF CHEBANSE.
0330 PM HAIL 5 W WATSEKA 40.78N 87.83W
05/06/2012 E0.25 INCH IROQUOIS IL COCORAHS
0331 PM HAIL STREATOR 41.13N 88.83W
05/06/2012 M1.00 INCH LA SALLE IL TRAINED SPOTTER
IN TOWN.
0333 PM HAIL CHEBANSE 41.00N 87.91W
05/06/2012 M1.75 INCH IROQUOIS IL TRAINED SPOTTER
0335 PM HAIL CLIFTON 40.94N 87.93W
05/06/2012 E2.75 INCH IROQUOIS IL EMERGENCY MNGR
EM RELAYED A PUBLIC REPORT OF BASEBALL SIZE HAIL.
0339 PM HAIL CHEBANSE 41.00N 87.91W
05/06/2012 E0.25 INCH IROQUOIS IL TRAINED SPOTTER
0350 PM FUNNEL CLOUD 6 E WENONA 41.05N 88.94W
05/06/2012 LIVINGSTON IL TRAINED SPOTTER
FUNNEL WAS BECOMING RAIN-WRAPPED.
0350 PM FUNNEL CLOUD 2 NNE ASHKUM 40.91N 87.94W
05/06/2012 IROQUOIS IL TRAINED SPOTTER
SPOTTER REPORTED A LOW ROTATING WALL CLOUD WITH A
POSSIBLE FUNNEL.
0350 PM TSTM WND GST 6 E WENONA 41.05N 88.94W
05/06/2012 M60.00 MPH LIVINGSTON IL TRAINED SPOTTER
0357 PM FUNNEL CLOUD STREATOR 41.13N 88.83W
05/06/2012 LA SALLE IL PUBLIC
LAW ENFORCEMENT RELAYED A PUBLIC REPORT OF A POSSIBLE
FUNNEL VISIBLE FROM THE 1500 BLOCK OF SOUTH JEFFERSON.
0402 PM HAIL 2 E DWIGHT 41.10N 88.39W
05/06/2012 E0.50 INCH LIVINGSTON IL TRAINED SPOTTER
ALONG RT 17 DIME SIZE HAIL.
0415 PM FLASH FLOOD 5 E WENONA 41.05N 88.96W
05/06/2012 LA SALLE IL LAW ENFORCEMENT
TWO FEET OF WATER OVER ILLINOIS HIGHWAY 17 NEAR THE LA
SALLE AND LIVINGSTON COUNTY BORDERS.
0432 PM HAIL CAMPUS 41.02N 88.31W
05/06/2012 M0.25 INCH LIVINGSTON IL TRAINED SPOTTER
PEA SIZE HAIL IN CAMPUS.
0435 PM HEAVY RAIN 5 W WATSEKA 40.78N 87.83W
05/06/2012 E1.37 INCH IROQUOIS IL COCORAHS
1.37 INCHES IN 30 MINUTES. SOME WIND DAMAGE TO FARM
BUILDING DUE TO STRAIGHT LINE WINDS.
0445 PM TSTM WND DMG CRESCENT CITY 40.77N 87.86W
05/06/2012 IROQUOIS IL TRAINED SPOTTER
2 REPORTS RCVD - EAST OF CRESCENT CITY TO WATSEKA ALONG
US 24. EST 60 POWER POLES BLOWN DOWN OVER RR TRACKS IN A
3/4 TO 1 1/2 MILE SECTION. OTHER POLES WERE DAMAGED. TIME
APPROX FROM 2140 UTC TO 2200 UTC
0455 PM HAIL CHATSWORTH 40.75N 88.29W
05/06/2012 M0.88 INCH LIVINGSTON IL TRAINED SPOTTER
PENNY TO NICKEL SIZE HAIL IN THE TOWN OF CHATSWORTH.
0513 PM HAIL CISSNA PARK 40.57N 87.89W
05/06/2012 E0.25 INCH IROQUOIS IL TRAINED SPOTTER
EST WIND GUST 30 MPH. SMALL LIMBS DOWN.
0600 PM FLASH FLOOD 2 E WATSEKA 40.78N 87.69W
05/06/2012 IROQUOIS IL EMERGENCY MNGR
1730N ROAD BUCKLED WHICH IS NEAR RTE 1. THIS WAS
POTENTIALLY DUE TO WATER. TIME IS OF REPORT. TIME OF ROAD
BUCKLING UNKNOWN.
&&
MTFLocal storm report, May 6, 7:07 PM CDT, 2 hours 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
707 PM CDT SUN MAY 06 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0355 PM FLASH FLOOD 4 SE STREATOR 41.08N 88.78W
05/06/2012 LIVINGSTON IL LAW ENFORCEMENT
WATER OVER MANY ROADWAYS IN NEW TOWN TOWNSHIP. THIS
CONTINUES AS OF 7 PM.
&&
MTFLocal storm report, May 6, 7:11 PM CDT, 2 hours 44 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
711 PM CDT SUN MAY 06 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0638 PM FLASH FLOOD 5 WSW KENTLAND 40.74N 87.53W
05/06/2012 BENTON IN TRAINED SPOTTER
ROAD COMPLETELY WASHED OUT AT THE INTERSECTION OF 900N
AND 1100W AT THE BENTON AND IROQUOIS COUNTY LINE. WATER
UP TO THE HOOD OF CAR SPOTTER IS IN.
&&
RCLocal storm report, May 6, 7:13 PM CDT, 2 hours 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
713 PM CDT SUN MAY 06 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0702 PM FLASH FLOOD 4 N FREELAND PARK 40.68N 87.49W
05/06/2012 BENTON IN LAW ENFORCEMENT
WATER COMPLETELY COVERING ROUTE 71 AT INTERSECTION OF
500N.
&&
RCLocal storm report, May 6, 7:28 PM CDT, 2 hours 27 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
728 PM CDT SUN MAY 06 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0702 PM FLASH FLOOD 4 N FREELAND PARK 40.68N 87.49W
05/06/2012 BENTON IN LAW ENFORCEMENT
WATER COMPLETELY COVERING ROUTE 71 AT INTERSECTION OF
500N.
0638 PM FLASH FLOOD 5 WSW KENTLAND 40.74N 87.53W
05/06/2012 BENTON IN TRAINED SPOTTER
ROAD COMPLETELY WASHED OUT AT THE INTERSECTION OF 900N
AND 1100W AT THE BENTON AND IROQUOIS COUNTY LINE. WATER
UP TO THE HOOD OF CAR SPOTTER IS IN.
0600 PM FLASH FLOOD 2 E WATSEKA 40.78N 87.69W
05/06/2012 IROQUOIS IL EMERGENCY MNGR
1730N ROAD BUCKLED WHICH IS NEAR RTE 1. THIS WAS
POTENTIALLY DUE TO WATER. TIME IS OF REPORT. TIME OF ROAD
BUCKLING UNKNOWN.
0513 PM HAIL CISSNA PARK 40.57N 87.89W
05/06/2012 E0.25 INCH IROQUOIS IL TRAINED SPOTTER
EST WIND GUST 30 MPH. SMALL LIMBS DOWN.
0455 PM HAIL CHATSWORTH 40.75N 88.29W
05/06/2012 M0.88 INCH LIVINGSTON IL TRAINED SPOTTER
PENNY TO NICKEL SIZE HAIL IN THE TOWN OF CHATSWORTH.
0445 PM TSTM WND DMG CRESCENT CITY 40.77N 87.86W
05/06/2012 IROQUOIS IL TRAINED SPOTTER
2 REPORTS RCVD - EAST OF CRESCENT CITY TO WATSEKA ALONG
US 24. EST 60 POWER POLES BLOWN DOWN OVER RR TRACKS IN A
3/4 TO 1 1/2 MILE SECTION. OTHER POLES WERE DAMAGED. TIME
APPROX FROM 2140 UTC TO 2200 UTC
0435 PM HEAVY RAIN 5 W WATSEKA 40.78N 87.83W
05/06/2012 E1.37 INCH IROQUOIS IL COCORAHS
1.37 INCHES IN 30 MINUTES. SOME WIND DAMAGE TO FARM
BUILDING DUE TO STRAIGHT LINE WINDS.
0432 PM HAIL CAMPUS 41.02N 88.31W
05/06/2012 M0.25 INCH LIVINGSTON IL TRAINED SPOTTER
PEA SIZE HAIL IN CAMPUS.
0415 PM FLASH FLOOD 5 E WENONA 41.05N 88.96W
05/06/2012 LA SALLE IL LAW ENFORCEMENT
TWO FEET OF WATER OVER ILLINOIS HIGHWAY 17 NEAR THE LA
SALLE AND LIVINGSTON COUNTY BORDERS.
0402 PM HAIL 2 E DWIGHT 41.10N 88.39W
05/06/2012 E0.50 INCH LIVINGSTON IL TRAINED SPOTTER
ALONG RT 17 DIME SIZE HAIL.
0357 PM FUNNEL CLOUD STREATOR 41.13N 88.83W
05/06/2012 LA SALLE IL PUBLIC
LAW ENFORCEMENT RELAYED A PUBLIC REPORT OF A POSSIBLE
FUNNEL VISIBLE FROM THE 1500 BLOCK OF SOUTH JEFFERSON.
0355 PM FLASH FLOOD 4 SE STREATOR 41.08N 88.78W
05/06/2012 LIVINGSTON IL LAW ENFORCEMENT
WATER OVER MANY ROADWAYS IN NEW TOWN TOWNSHIP. THIS
CONTINUES AS OF 7 PM.
0350 PM TSTM WND GST 6 E WENONA 41.05N 88.94W
05/06/2012 M60.00 MPH LIVINGSTON IL TRAINED SPOTTER
0350 PM TORNADO ASHKUM 40.88N 87.95W
05/06/2012 IROQUOIS IL PUBLIC
SOUTH OF TOWN ALONG I-57 NEAR MILE MARKER 290.
0350 PM FUNNEL CLOUD 2 NNE ASHKUM 40.91N 87.94W
05/06/2012 IROQUOIS IL TRAINED SPOTTER
SPOTTER REPORTED A LOW ROTATING WALL CLOUD WITH A
POSSIBLE FUNNEL.
0350 PM FUNNEL CLOUD 6 E WENONA 41.05N 88.94W
05/06/2012 LIVINGSTON IL TRAINED SPOTTER
FUNNEL WAS BECOMING RAIN-WRAPPED.
0339 PM HAIL CHEBANSE 41.00N 87.91W
05/06/2012 E0.25 INCH IROQUOIS IL TRAINED SPOTTER
0335 PM HAIL CLIFTON 40.94N 87.93W
05/06/2012 E2.75 INCH IROQUOIS IL EMERGENCY MNGR
EM RELAYED A PUBLIC REPORT OF BASEBALL SIZE HAIL.
0333 PM HAIL CHEBANSE 41.00N 87.91W
05/06/2012 M1.75 INCH IROQUOIS IL TRAINED SPOTTER
0331 PM HAIL STREATOR 41.13N 88.83W
05/06/2012 M1.00 INCH LA SALLE IL TRAINED SPOTTER
IN TOWN.
0330 PM HAIL 5 W WATSEKA 40.78N 87.83W
05/06/2012 E0.25 INCH IROQUOIS IL COCORAHS
0329 PM HAIL SW CHEBANSE 41.00N 87.91W
05/06/2012 E0.50 INCH IROQUOIS IL TRAINED SPOTTER
DIME SIZE HAIL SW OF CHEBANSE.
0325 PM HAIL 12 NW CLIFTON 41.06N 88.10W
05/06/2012 M1.75 INCH KANKAKEE IL TRAINED SPOTTER
APPROXIMATELY AT INTERSECTION OF 3200 NORTH AND 400 EAST
IN NORTHWEST IROQUOIS COUNTY.
0320 PM HAIL 13 NW CLIFTON 41.07N 88.11W
05/06/2012 M1.00 INCH KANKAKEE IL TRAINED SPOTTER
INTERSECTION OF COUNTY ROADS 3300 NORTH AND 400 EAST IN
NORTHWEST IROQUOIS COUNTY.
0252 PM HAIL CHICAGO 41.88N 87.63W
05/06/2012 E0.88 INCH COOK IL TRAINED SPOTTER
MIXED NICKEL AND DIME SIZE HAIL IN HUMBOLDT PARK.
0215 PM HEAVY RAIN FOX LAKE 42.42N 88.18W
05/06/2012 E1.70 INCH LAKE IL PUBLIC
STORM TOTAL OF 1.70 INCHES FROM THE MORNING RAINFALL.
0115 PM HEAVY RAIN WINTHROP HARBOR 42.48N 87.83W
05/06/2012 E1.08 INCH LAKE IL COCORAHS
1.08 INCHES IN 60 MINUTES.
0115 PM HEAVY RAIN 2 E LAKEMOOR 42.34N 88.17W
05/06/2012 E1.12 INCH LAKE IL COCORAHS
2 MILES SE OF LAKEMOOR...OR 1 MILE SOUTH OF VOLO - 1.12
INCHES IN 60 MINUTES.
0108 PM HAIL CRETE 41.45N 87.62W
05/06/2012 E0.50 INCH WILL IL TRAINED SPOTTER
DIME-SIZED HAIL.
0100 PM HEAVY RAIN 2 NNE GURNEE 42.40N 87.92W
05/06/2012 E0.81 INCH LAKE IL COCORAHS
0.81 OF AN INCH SO FAR WITH 0.21 IN 30 MINUTES.
0100 PM HAIL PARK FOREST 41.48N 87.69W
05/06/2012 E0.88 INCH COOK IL PUBLIC
1250 PM HEAVY RAIN 2 N WAUKEGAN 42.40N 87.87W
05/06/2012 E1.02 INCH LAKE IL COCORAHS
1.02 INCHES IN 40 MINUTES.
1249 PM HEAVY RAIN WAUKEGAN 42.37N 87.87W
05/06/2012 E0.62 INCH LAKE IL TRAINED SPOTTER
0.62 IN AN HOUR.
1245 PM HAIL MONEE 41.42N 87.75W
05/06/2012 E0.25 INCH WILL IL TRAINED SPOTTER
1130 AM HAIL FOX RIVER GROVE 42.20N 88.22W
05/06/2012 E0.25 INCH MCHENRY IL TRAINED SPOTTER
SMALLER THAN PEA SIZE HAIL. SOME ROTATION. HEAVY CLOUD TO
GROUND LIGHTNING.
1120 AM HAIL MONTGOMERY 41.73N 88.34W
05/06/2012 E0.25 INCH KANE IL BROADCAST MEDIA
VIEWER REPORT.
1115 AM HEAVY RAIN 4 NE LISBON 41.52N 88.43W
05/06/2012 E0.85 INCH KENDALL IL COCORAHS
0.85 INCH IN 20 MINUTES.
1114 AM HAIL 2 ESE MONTGOMERY 41.72N 88.31W
05/06/2012 E0.25 INCH KENDALL IL TRAINED SPOTTER
PEA SIZED HAIL AT DICKSON AND GALENA ROADS JUST NORTH OF
BRISTOL IL.
1110 AM HAIL 4 W HUNTLEY 42.17N 88.50W
05/06/2012 E0.50 INCH MCHENRY IL COCORAHS
1110 AM HAIL SUGAR GROVE 41.77N 88.46W
05/06/2012 E0.25 INCH KANE IL TRAINED SPOTTER
2 MILES SW OF AURORA AIRPORT.
1104 AM HAIL 4 NE LISBON 41.52N 88.43W
05/06/2012 E0.75 INCH KENDALL IL COCORAHS
1040 AM HAIL BELVIDERE 42.25N 88.85W
05/06/2012 E1.00 INCH BOONE IL PUBLIC
1025 AM HAIL BELVIDERE 42.25N 88.85W
05/06/2012 E1.00 INCH BOONE IL COCORAHS
MOSTLY PEA AND SLIGHTLY LARGER - SOME NICKEL-SIZED AND A
FEW QUARTER-SIZED.
1025 AM HAIL BELVIDERE 42.25N 88.85W
05/06/2012 E0.50 INCH BOONE IL BROADCAST MEDIA
DIME SIZED HAIL REPORTED BY VIEWER.
&&
BNSpecial weather statement, May 6, 9:01 PM CDT, 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
901 PM CDT SUN MAY 6 2012
ILZ013-014-070300-
COOK IL-DUPAGE IL-
901 PM CDT SUN MAY 6 2012
...SPECIAL WEATHER STATEMENT...
AT 858 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG
THUNDERSTORM NEAR HANOVER PARK...MOVING EAST AT 25 MPH.
UP TO PENNY SIZE HAIL...OCCASIONAL CLOUD TO GROUND LIGHTNING...AND
BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM.
LOCATIONS IMPACTED INCLUDE...
HANOVER PARK... CAROL STREAM... BARTLETT...
WEST CHICAGO... ROSELLE... MEDINAH...
SCHAUMBURG... LOMBARD... ITASCA...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. HEAVY RAINFALL
COULD LEAD TO STANDING WATER ON ROADWAYS AND POOR VISIBILITY. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.
LAT...LON 4215 8775 4211 8772 4208 8768 4200 8764
4197 8764 4196 8763 4195 8763 4188 8760
4187 8761 4187 8823 4199 8824
TIME...MOT...LOC 0201Z 260DEG 20KT 4196 8812
BIRKThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 9:01 PM CDT | Special Weather Statement | LOT | Cook | 59 min |
| May 6, 9:23 PM CDT | River Flood Watch | LOT | Lake | 13 hr |
| May 6, 9:40 PM CDT | River Flood Advisory | LOT | Will | 24 hr |
| May 6, 9:40 PM CDT | River Flood Advisory | LOT | Iroquois | 67 hr |
| May 6, 10:32 PM CDT | Special Weather Statement | LOT | Cook | 43 min |
| May 6, 10:35 PM CDT | Special Weather Statement | LOT | Cook | 40 min |
| May 6, 10:58 PM CDT | Areal Flood Advisory | LOT | DeKalb, LaSalle, Lee | 6 hr |
| May 6, 11:09 PM CDT | Special Weather Statement | LOT | Grundy | 36 min |
| May 6, 11:22 PM CDT | Flash Flood Warning | LOT | Grundy, Kendall, LaSalle, Livingston | 8 hr |
| May 6, 11:24 PM CDT | Flash Flood Warning | LOT | Cook, Grundy, Kankakee, Kendall, Will | 6 hr |
| May 7, 12:26 AM CDT | Flash Flood Warning | LOT | Ford, Iroquois, Kankakee | 7 hr |
| May 7, 1:43 AM CDT | Flash Flood Warning | LOT | Iroquois | 6 hr |
| May 7, 2:02 AM CDT | River Flood Advisory | LOT | Kane, Kendall | 8 hr |
| May 7, 3:56 AM CDT | Flash Flood Warning | LOT | Ford, Livingston | 4 hr |
| May 7, 5:05 AM CDT | Areal Flood Advisory | LOT | DeKalb, LaSalle, Lee | 2 hr |
| May 7, 5:42 AM CDT | Areal Flood Warning | LOT | Grundy, Kankakee, Will | 12 hr |
| May 7, 6:15 AM CDT | River Flood Warning | LOT | Bureau, LaSalle | 5 days |
| May 7, 6:23 AM CDT | River Flood Advisory | LOT | Grundy | 16 hr |
| May 7, 6:23 AM CDT | River Flood Advisory | LOT | LaSalle | 16 hr |
| May 7, 7:00 AM CDT | Areal Flood Warning | LOT | Ford, Grundy, Iroquois, Kankakee, LaSalle, Livingston | 22 hr |
| May 7, 8:18 AM CDT | River Flood Warning | LOT | LaSalle | 9 hr |
| May 7, 10:06 AM CDT | River Flood Advisory | LOT | Grundy, Will | 68 hr |
| May 7, 10:06 AM CDT | River Flood Advisory | LOT | Grundy | 8 hr |
| May 7, 3:36 PM CDT | River Flood Advisory | LOT | Iroquois | 7 hr |
| May 7, 5:30 PM CDT | River Flood Warning | LOT | Grundy | 28 hr |
| May 7, 5:31 PM CDT | Areal Flood Warning | LOT | Grundy, Kankakee, Will | 12 hr |
Nearby
Severe Thunderstorm Warnings in Illinois, 2012Every severe thunderstorm warning 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.