Alert archive / Illinois / Tornado Warnings in 2010
Tornado Warning 18, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Jun 21, 2010, 9:17 PM CDT for Ford County, Iroquois County, Livingston County, Illinois. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 21, 2010, 9:17 PM CDT (02:17 UTC)
- Expired
- Jun 21, 2010, 10:00 PM CDT
- In force
- 43 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
Counties Ford County, IL, Iroquois County, IL, Livingston County, IL
The radar
The Chicago radar (KLOT), 96 km from the middle of the area, began a volume at 02:20 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 21, 4:36 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 2.3 hours before the alert went out and 74 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
- 4509 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 931 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 194 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 10.5
What forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at Jun 21, 7:59 PM CDT, 1 hour 18 minutes earlier.
Area forecast discussion, Jun 21, 7:59 PM CDT, 1 hour 18 minutes before
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 759 PM CDT MON JUN 21 2010 .MESOSCALE DISCUSSION... 134 PM CDT THIS MORNING'S MCV CONTINUES TO MOVE EASTWARD EARLY THIS AFTERNOON WITH SKIES CLEARING OUT AND ATMOSPHERE GRADUALLY RECOVERING. SPC OBJECTIVE ANALYSIS DATA...VISIBLE SATELLITE IMAGERY...AND RECENT ACARS SOUNDINGS SUGGEST THAT THE ATMOSPHERE HAS NOT YET RECOVERED FROM THE MORNING CONVECTION WITH CONSIDERABLE CIN FOR BOUNDARY LAYER BASED CONVECTION. TEMPERATURES ARE WARMING QUICKLY AND THE RECOVERY PROCESS IS WELL UNDERWAY OVER SOUTHERN PORTIONS OF THE CWA...CIN FOR BOUNDARY LAYER BASED PARCELS SOUTH OF THE KANKAKEE RIVER LIKELY TO BE NEGLIGIBLE SOON. STRONG...LIKELY SLIGHTLY ELEVATED STILL...CONVECTION FROM PIA SOUTHWESTWARD WILL LIKELY INTENSIFY FURTHER AS IT PUSHES EASTWARD THIS AFTERNOON. VERY HIGH REFLECTIVITY/LOW CENTROID STORMS ARE LIKELY EXTREMELY EFFICIENT RAIN PRODUCERS WITH FAIRLY LOW HAIL THREAT GIVEN WARM/MOIST ENVIRONMENT. DCAPE VALUES ARE SUFFICIENT FOR STORMS TO BEGIN TO FORM A COLD POOL AND ACCELERATE EASTWARD WITH AN INCREASING THREAT FOR DAMAGING WINDS AS THE AFTERNOON WEARS ON. IT IS UNCLEAR WHETHER THE ATMOSPHERE OVER THE CENTRAL AND NORTHERN PORTIONS OF THE CWA WILL HAVE TIME TO RECOVER SUFFICIENTLY FOR STRONG/SEVERE STORMS TO DEVELOP IN ASSOCIATION WITH ACTIVITY CURRENTLY OVER EASTERN IA. CONFIDENCE IS LOWER ON THIS SCENARIO AND IT WILL CERTAINLY BARE WATCHING AS THE AFTERNOON WEARS ON. IZZI && .DISCUSSION... 246 PM CDT SHORT TERM (TONIGHT THROUGH THURSDAY)... FORECAST REASONING HAS CHANGED VERY LITTLE FROM PREVIOUS COUPLE OF AFD'S WITH RING OF FIRE PATTERN CONTINUING. MCV MOVING TOWARD THE AREA THIS AFTERNOON WILL LIKELY CONTINUE TO LIGHT UP THIS AFTERNOON WITH CONVECTION BECOMING MORE ORGANIZED AND CONGEALING INTO ANOTHER MCS THAT SHOULD BE EXITING THE CWA EARLY THIS EVENING. WATER VAPOR IMAGERY WOULD THEN SUGGEST WE COULD SEE A RATHER SIZABLE BREAK IN THE PRECIPITATION AWAITING THE NEXT MCS TO ORGANIZE OVER THE PLAINS AND PEEL EASTWARD...WHICH MAY BE DELAYED UNTIL SOMETIME TUESDAY IF MODEL GUIDANCE IS ANYWHERE NEAR CORRECT. WILL LIKELY MAKE SOME LAST MINUTE TWEAKS TO POP/WX GRIDS BASED ON NEAR TERM TRENDS BUT THINKING THAT WE MAY BE ABLE TO LOWER POPS CONSIDERABLY OVERNIGHT. ASSUMING THAT TONIGHT'S MCS OVER THE PLAINS DOESNT ARRIVE UNTIL THE AFTERNOON ON TUESDAY...THEN IT IS LIKELY THAT THE FRONT WILL HAVE HAD TIME TO MEANDER FARTHER NORTHWARD AND IN ALL LIKELIHOOD WE SHOULD BECOME MODERATELY TO STRONGLY UNSTABLE. REGENERATION OF CONVECTION WOULD THEN BE LIKELY QUITE LIKELY WITH AN ENHANCED THREAT OF DAMAGING WINDS TUESDAY AFTERNOON. THIS ALL HINGES OF COURSE ON THE TIMING OF THE MCS TONIGHT INTO TUESDAY WHICH WE (AND THE MODELS) REALLY HAVE VERY LITTLE SKILL IN FORECASTING. WAVE TRAIN OF MCS'S SHOULD CONTINUE TUESDAY NIGHT THROUGH WEDNESDAY NIGHT WITH ANOTHER COUPLE OF MCS'S PROBABLE DURING THAT TIME PERIOD. THESE THUNDERSTORMS WILL BE VERY EFFICIENT RAIN PRODUCERS AS WE FOUND OUT THIS MORNING WITH THE SWATH OF LOCALLY 3" OF RAIN IN OUR SOUTHERN CWA. NO REASON FOR RAINFALL OF AT LEAST THAT MAGNITUDE TO NOT OCCUR AGAIN A COUPLE MORE TIMES OVER THE NEXT COUPLE OF DAYS. GAVE VERY SERIOUS CONSIDERATION TO A FLASH FLOOD WATCH WITH THIS AFTERNOON'S FORECAST. HOWEVER FOR THE MOST PART WE MISSED SIGNIFICANT RAINFALL TOTALS WITH THIS MORNING'S MCS (EXCEPT FAR SOUTH) AND SINCE IT APPEARS THAT ANY FLOOD THREAT WOULD BE ISOLATED WITH THIS AFTERNOON/EVENING'S CONVECTION...INCLUDING A BREAK FOLLOWING. THERE AFTER I DECIDED TO HOLD OFF ON HEADLINES FOR NOW AND WILL RE-ISSUE THE ESF. STILL WOULD THINK THAT AT SOME POINT IN THE NOT TOO DISTANT FUTURE...WE WILL NEED A FLASH FLOOD WATCH. SHOULD THE WARM FRONT MAKE IT SOLIDLY NORTH AND WE NOT SIT UNDER CONVECTIVE DEBRIS OR OUTFLOW TUESDAY OR WEDNESDAY THEN IT WOULD LIKELY GET VERY HOT AND HUMID. COULD EVEN FLIRT WITH HEAT ADVISORY CRITERIA IN OUR SOUTHERN COUNTIES...HOWEVER WITH OUR AREA SEEMINGLY LOCKED ON THE MCS TRAIN TRACKS ITD BE SILLY TO EVEN PONDER THOSE KIND OF HEADLINES FOR 2ND PERIOD. CANADIAN HIGH SHOULD FINALLY BUILD SOUTHEASTWARD INTO THE REGION THURSDAY WITH MUCH DRIER AIRMASS USHERING INTO THE REGION AND FIRMLY CLAMPING OFF THE SPICKET IN THE SKY FOR A COUPLE DAYS AT LEAST. IZZI LONG TERM (FRIDAY THROUGH MONDAY)... RELATIVELY DRY END TO THE WEEK WILL SHIFT BACK TOWARDS WET THIS WEEKEND. HIGH PRESSURE WILL SHIFT EAST FROM THE PLAINS AND ACROSS THE GREAT LAKES BY FRIDAY MORNING BEFORE SHIFTING EAST ACROSS NEW ENGLAND BY THE START OF THE WEEKEND. A WARM FRONT SHOULD LIFT THROUGH EARLY IN THE WEEKEND ALLOWING FOR SOME OF THE HOTTEST TEMPERATURES OF THE YEAR TO TAKE HOLD. ENSEMBLE GUIDANCE IS SUGGESTING H85 TEMPERATURES AROUND 21-22 DEGREES C SATURDAY AFTERNOON OVER THE CHICAGO METRO...AND SIMILAR CONDITIONS SUNDAY. WINDS WILL BECOME SOUTHERLY AS THE FRONT PUSHES NORTH...BRINGING BACK MOISTURE FROM THE SOUTH. WHILE STILL EARLY...IT IS WORTH NOTING THAT HEAT INDICIES COULD EASILY FLIRT WITH 100S IF THIS PANS OUT. SOUTH TO SOUTHWEST WINDS IN THE OVERNIGHT HOURS DURING THE WEEKEND WILL LEAVE LITTLE IN RELIEF OVERNIGHT IN THE METRO AREA WHERE THE HEAT ISLAND WILL EFFECT WILL DOMINATE. ENSEMBLE RELATIVE MEASURE OF PREDICTABILITY FALLS OFF BEYOND MONDAY AS FLOW BECOMES ZONAL AND ENSEMBLE SPREAD BECOMES QUITE LARGE. SHEA && .AVIATION... //ORD AND MDW CONCERNS...UPDATED 01Z... LINE OF THUNDERSTORMS IS TRACKING SLOWER THAN ORIGINALLY PROJECTED...HAVE UPDATED TAFS TO REFLECT NEW TIMING. WILL HAVE TO CONTINUE TO MONITOR AS STORMS COULD ACCELERATE AS THEY CONTINUE TO EVOLVE. BMD //DISCUSSION...UPDATED 00Z... LINE OF STRONG THUNDERSTORMS HAS DEVELOPED ALONG AN OUTFLOW BOUNDARY EARLY THIS EVENING. AT 00Z...THIS LINE OF THUNDERSTORMS EXTENDS ALONG A NORTH SOUTH ORIENTED LINE ABOUT 30 MILES WEST OF KRFD THEN EXTENDS TO THE SOUTHWEST INTO IOWA AND NORTHERN MISSOURI. THE SOUTHERN SECTIONS OF THIS LINE OF THUNDERSTORMS CONTINUE TO MOVE INTO A FAVORABLE ENVIRONMENT FOR THUNDERSTORM DEVELOPMENT WHILE THE NORTHERN PORTIONS HAVE MAINTAINED INTENSITY OVER THE PAST COUPLE HOURS WHILE CONGEALING INTO A LINE. WINDS PREDOMINATELY OUT OF THE SOUTH EARLY IN THE PERIOD ARE EXPECTED TO TURN MORE SOUTH-SOUTHWEST TO SOUTHWESTERLY AS A WEAK SURFACE TROUGH TRAVERSES THE NORTHERN PART OF THE STATE THIS EVENING. WINDS SHOULD SUBSIDE AFTER 12Z AS SURFACE HIGH TRIES TO REESTABLISH ITSELF OVER MINNESOTA. EARLY AFTERNOON ON TUESDAY...WINDS SHOULD BECOME SOUTHERLY AGAIN AS A LOW PRESSURE SYSTEM INTENSIFIES OVER THE PLAIN STATES. BMD //ORD AND MDW CONFIDENCE...UPDATED 01Z... HIGH CONFIDENCE IN DEVELOPMENT OF LINE OF THUNDERSTORMS THAT WILL MOVE ACROSS NORTHERN ILLINOIS THIS EVENING. LOW CONFIDENCE IN TIMING. BMD //OUTLOOK FOR ORD/MDW FOR 06Z WEDNESDAY-12Z SUNDAY...UPDATED 18Z... TUESDAY NIGHT...TS LIKELY...OCNL MVFR CIG/VIS. WEDNESDAY...CHC TS...OTRW VFR. THURSDAY...VFR. FRIDAY...VFR. SATURDAY...ISOL TS...OTRW VFR. SUNDAY...CHC TS. MERZLOCK && .MARINE... 230 PM CDT RELATIVELY DRY END TO THE WEEK WILL SHIFT BACK TOWARDS WET THIS WEEKEND. HIGH PRESSURE WILL SHIFT EAST FROM THE PLAINS AND ACROSS THE GREAT LAKES BY FRIDAY MORNING BEFORE SHIFTING EAST ACROSS NEW ENGLAND BY THE START OF THE WEEKEND. A WARM FRONT SHOULD LIFT THROUGH EARLY IN THE WEEKEND ALLOWING FOR SOME OF THE HOTTEST TEMPERATURES OF THE YEAR TO TAKE HOLD. ENSEMBLE GUIDANCE IS SUGGESTING H85 TEMPERATURES AROUND 21-22 DEGREES C SATURDAY AFTERNOON OVER THE CHICAGO METRO...AND SIMILAR CONDITIONS SUNDAY. WINDS WILL BECOME SOUTHERLY AS THE FRONT PUSHES NORTH...BRINGING BACK MOISTURE FROM THE SOUTH. WHILE STILL EARLY...IT IS WORTH NOTING THAT HEAT INDICIES COULD EASILY FLIRT WITH 100S IF THIS PANS OUT. SOUTH TO SOUTHWEST WINDS IN THE OVERNIGHT HOURS DURING THE WEEKEND WILL LEAVE LITTLE IN RELIEF OVERNIGHT IN THE METRO AREA WHERE THE HEAT ISLAND WILL EFFECT WILL DOMINATE. ENSEMBLE RELATIVE MEASURE OF PREDICTABILITY FALLS OFF BEYOND MONDAY AS FLOW BECOMES ZONAL AND ENSEMBLE SPREAD BECOMES QUITE LARGE. SHEA && .LOT WATCHES/WARNINGS/ADVISORIES... IL...NONE. IN...NONE. LM...NONE. &&
Hazardous weather outlook, Jun 21, 4:56 PM CDT, 4 hours 21 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
456 PM CDT MON JUN 21 2010
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
222200-
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-
456 PM CDT MON JUN 21 2010 /556 PM EDT MON JUN 21 2010/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TONIGHT.
WEATHER HAZARDS EXPECTED:
SCATTERED THUNDERSTORMS...SOME COULD PRODUCE:
DAMAGING WINDS IN EXCESS OF 70 MPH.
HAIL TO THE SIZE OF GOLFBALLS.
VERY HEAVY RAINFALL WITH LOCALIZED FLOODING.
FREQUENT CLOUD TO GROUND LIGHTNING.
POSSIBLY A TORNADO.
AREAS AFFECTED AND TIMING:
SCATTERED THUNDERSTORMS WILL DEVELOP EARLY THIS EVENING AND
COULD LINGER INTO THE EARLY PORTIONS OF THE OVERNIGHT
HOURS...WITH THE GREATEST POTENTIAL FOR SEVERE WEATHER SOUTH OF
A VALPARAISO TO JOLIET TO OREGON LINE.
DISCUSSION:
THE ATMOSPHERE IS QUICKLY DESTABILIZING AND WINDS ALOFT ARE
INCREASING IN ADVANCE OF AN APPROACHING UPPER LEVEL
DISTURBANCE...SETTING THE STAGE FOR THE DEVELOPING THUNDERSTORMS
TO QUICKLY BECOME SEVERE. GIVEN THE VERY STRONG INSTABILITY AND
INCREASING WINDS ALOFT THE POTENTIAL EXISTS FOR THE MOST INTENSE
STORMS TO PRODUCE DAMAGING WINDS...LARGE HAIL AND POSSIBLY A
TORNADO.
THE THREAT OF SEVERE THUNDERSTORMS SHOULD GRADUALLY DIMINISH
LATER THIS EVENING INTO THE OVERNIGHT HOURS. GIVEN THE VERY
MOIST AIRMASS IN PLACE THE POTENTIAL WILL EXIST FOR LOCALLY
HEAVY RAINFALL...WHICH COULD RESULT IN LOCALIZED FLASH FLOODING.
FINALLY...PORTIONS OF THE UPPER ILLINOIS RIVER AND SUGAR CREEK
WILL REMAIN IN FLOOD.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THE AREA WILL CONTINUE TO SEE PERIODIC THUNDERSTORMS TUESDAY
THROUGH WEDNESDAY NIGHT. WE WILL REMAIN IN A PATTERN THAT IS
CONDUCIVE FOR SOME OF THESE THUNDERSTORMS TO BE SEVERE WITH
DAMAGING WINDS THE PRIMARY THREAT.
THE THUNDERSTORMS WILL ALSO PRODUCE LOCALLY VERY HEAVY RAINFALL
TOTALS...WITH THE THREAT OF FLASH FLOODING INCREASING WITH EACH
SUCCESSIVE ROUND OF THUNDERSTORMS. GIVEN THE POTENTIAL FOR
REPEATED BOUTS OF HEAVY RAINFALL...THE THREAT DOES EXIST FOR
SIGNIFICANT FLOODING PROBLEMS TO DEVELOP THIS WEEK.
PORTIONS OF THE UPPER ILLINOIS RIVER WILL REMAIN IN FLOOD
THROUGH THE UPCOMING WORK WEEK.
HEAT INDICES OVER 100 DEGREES ARE POSSIBLE OVER THE WEEKEND.
THERE IS ALSO A CHANCE OF THUNDERSTORMS BY SATURDAY NIGHT INTO
SUNDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS WILL BE NEEDED THIS EVENING.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
LMZ740>745-222200-
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-
456 PM CDT MON JUN 21 2010
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.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
PERIODIC CHANCES OF THUNDERSTORMS WILL CONTINUE TUESDAY THROUGH
WEDNESDAY NIGHT. SOME OF THE STORMS MAY BE SEVERE WITH WIND GUSTS
OVER 50 KNOTS THE PRIMARY HAZARD.
THERE IS ANOTHER CHANCE OF THUNDERSTORMS SATURDAY NIGHT INTO
SUNDAY.
&&
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-
870-872-874-876-878-222200-
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 TOW 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-
456 PM CDT MON JUN 21 2010
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.
.DAY ONE...TONIGHT.
THERE IS A CHANCE OF THUNDERSTORMS.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS TUESDAY THROUGH
WEDNESDAY NIGHT. SOME OF THE STORMS MAY BE SEVERE ACROSS SOUTHERN
LAKE MICHIGAN...WITH WIND GUSTS OVER 50 KNOTS THE PRIMARY HAZARD.
THERE IS ALSO A CHANCE OF THUNDERSTORMS OVER MAINLY NORTHERN
PORTIONS OF THE LAKE BY FRIDAY NIGHT INTO SATURDAY...SPREADING TO
SOUTHERN PORTIONS OF THE LAKE SATURDAY.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
IZZIIn the hours before
Local storm report, Jun 21, 8:17 PM CDT, 1 hour before
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</html>Local storm report, Jun 21, 8:18 PM CDT, 59 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
818 PM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0805 PM FLASH FLOOD MELVIN 40.57N 88.25W
06/21/2010 FORD IL EMERGENCY MNGR
WATER IN FIELD DRAINING ACROSS ROAD. ROAD CLOSED.
&&
ALYZALocal storm report, Jun 21, 8:21 PM CDT, 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
821 PM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0813 PM FUNNEL CLOUD 2 NE PAXTON 40.48N 88.07W
06/21/2010 FORD IL TRAINED SPOTTER
MOVING TOWARD CISSNA PARK.
&&
ALYZALocal storm report, Jun 21, 8:48 PM CDT, 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
848 PM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0833 PM TSTM WND DMG 2 S PECATONICA 42.28N 89.36W
06/21/2010 WINNEBAGO IL PUBLIC
A FEW TREES DOWN.
&&
ALYZALocal storm report, Jun 21, 8:58 PM CDT, 19 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
858 PM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0853 PM HEAVY RAIN WINNEBAGO 42.27N 89.24W
06/21/2010 U0.00 INCH WINNEBAGO IL AMATEUR RADIO
RAIN IN EXCESS OF ONE INCH PER HOUR.
&&
ALYZALocal storm report, Jun 21, 9:13 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
913 PM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0905 PM TSTM WND DMG ROCKFORD 42.27N 89.06W
06/21/2010 WINNEBAGO IL LAW ENFORCEMENT
MEDIUM SIZED TREE LIMB DOWN ON RT. 173
&&
ALYZAThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 7:18 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 57 min |
| Jun 21, 7:45 PM CDT | Special Weather Statement | LOT | Ogle | 45 min |
| Jun 21, 7:47 PM CDT | Flash Flood Warning | LOT | Ford, Iroquois | 6 hr |
| Jun 21, 7:59 PM CDT | Severe Thunderstorm Warning | LOT | Ogle, Winnebago | 31 min |
| Jun 21, 8:34 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Ogle, Winnebago | 56 min |
| Jun 21, 8:51 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Grundy, Kankakee, LaSalle, Livingston, Will | 54 min |
| Jun 21, 9:25 PM CDT | River Flood Advisory | LOT | Grundy, Will | 4 days |
| Jun 21, 9:34 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry | 56 min |
| Jun 21, 9:50 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Grundy, Kendall, Will | 32 min |
| Jun 21, 9:53 PM CDT | Special Marine Warning | LOT | 112 min | |
| Jun 21, 9:54 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois | 66 min |
| Jun 21, 10:06 PM CDT | Special Marine Warning | LOT | 114 min | |
| Jun 21, 10:10 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois, Kankakee | 65 min |
| Jun 21, 10:15 PM CDT | River Flood Advisory | LOT | Grundy | 55 hr |
| Jun 21, 10:15 PM CDT | River Flood Advisory | LOT | LaSalle | 55 hr |
| Jun 21, 10:22 PM CDT | Tornado Warning | LOT | Lake, McHenry | 38 min |
| Jun 21, 10:52 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 24 min |
| Jun 21, 10:58 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake | 47 min |
| Jun 21, 11:05 PM CDT | Special Marine Warning | LOT | 70 min | |
| Jun 22, 12:00 AM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois | 45 min |
| Jun 22, 12:35 AM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 40 min |
| Jun 22, 1:49 AM CDT | Areal Flood Advisory | LOT | Ford, Iroquois | 3 hr |
| Jun 22, 4:52 AM CDT | Flash Flood Warning | LOT | Iroquois | 6 hr |
| Jun 22, 2:57 PM CDT | River Flood Advisory | LOT | Iroquois, Kankakee | 3 days |
| Jun 21, 8:46 PM CDT | River Flood Warning | LOT | Lake, Newton | 13 hr |
| Jun 22, 10:50 AM CDT | Flash Flood Warning | LOT | Benton | 3 hr |
| Jun 22, 1:43 PM CDT | Areal Flood Warning | LOT | Benton | 17 hr |
Nearby
Tornado Warnings in Illinois, 2010Every tornado warning in 2010Tornadoes in 2010
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.