Tornadoes · United States · Illinois · 2015
EF1 tornado, Hartland, Illinois, April 9, 2015
This EF1 tornado ran 0.3 miles across McHenry County on April 9, 2015, touching down at 7:50 PM CDT and reaching 30 yards wide. It killed nobody.
The rating scale
Tracks are drawn in the color of the rating. The Enhanced Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.
EF065 to 85 mph
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
EF186 to 110 mphthis tornado
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
EF2111 to 135 mph
Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.
EF3136 to 165 mph
Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.
EF4166 to 200 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
EF5over 200 mph
Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.
Unrated
The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.
The record
- Rating
- EF1
- Date
- April 9, 2015
- Touchdown
- 7:50 PM CDT (00:50 UTC)
- Lifted
- 7:51 PM CDT (00:51 UTC)
- On the ground
- 1 minutes
- Path length
- 0.3 miles (0.5 km)
- Path width
- 30 yards (27 m)
- Deaths
- 0
- Injuries
- 0
- County
- McHenry County
- Touchdown point
- 42.398, -88.531
- Lift-off point
- 42.402, -88.527
- Record number
- 1504091850-01
The damage survey
4 damage points were recorded along this path by NWS LOT, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF1. The highest wind the damage implies is 93 mph.
- Softwoods snapped and uprooted, about 6-7 trees total affected. Most damage faced northeast, but uprooted tree in front of house pointed east. Antenna from roof of house blown off and tree falling onto house caused some roof damage.
- Tornado touched down in field southwest of property on McGuire road
Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.
What the Weather Service recorded
Seven tornadoes were confirmed in north central Illinois in the NWS Chicago CWA. Six of the tornadoes formed from a single supercell. The atmosphere was ripe for severe weather due to highly anomalous moisture and instability for early April across the region. A strong low pressure system advanced into this favorable air mass. Combined with robust wind shear, this helped to trigger these potent storms. A long tracked violent tornado destroyed numerous homes and farmsteads along its path across north central Lee, eastern Ogle, northwest Dekalb, and southern Boone counties. This path included the far northwest side of Rochelle, Interstate-39, and a direct hit in the community of Fairdale where two fatalities occurred. This was the strongest tornado in the NWS Chicago CWA since the F5 tornado that struck Plainfield, IL on August 28th, 1990.
A brief tornado snapped and uprooted 6 to 7 trees at a property on McGuire Road southeast of Harvard. Minor tree damage occurred on the north side of the road before ending. Maximum winds were estimated to 90 mph. (Tornado 7 of 7).
From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.
The warnings
9 minutes of warning. NWS LOT issued a tornado warning for this county at 00:41 UTC, 9 minutes before the tornado touched down, in force until 01:30 UTC.
The county was under a tornado watch, issued at 18:52 UTC and running to 03:37 UTC.
| Issued (UTC) | Expired | Product | Office |
|---|---|---|---|
| 18:52 UTC | 03:37 UTC | Tornado Watch | LOT |
| 23:56 UTC | 00:30 UTC | Tornado Warning | LOT |
| 00:16 UTC | 00:45 UTC | Tornado Warning | LOT |
| 00:19 UTC | 00:45 UTC | Tornado Warning | LOT |
| 00:21 UTC | 03:15 UTC | Flood Advisory | LOT |
| 00:41 UTC | 01:30 UTC | Tornado Warning | LOT |
| 00:53 UTC | 01:30 UTC | Severe Thunderstorm Warning | LOT |
| 01:05 UTC | 02:00 UTC | Severe Thunderstorm Warning | LOT |
| 03:27 UTC | 09:00 UTC | Wind Advisory | LOT |
Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.
The forecast that day
The Storm Prediction Center had this point in a Enhanced Risk, with a 0.10 chance of a tornado within 25 miles, in the hatched area where significant tornadoes were expected. The outlook in force was issued at 20:00 UTC.
SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.
What forecasters said that day
The local office's own words before the tornado touched down, 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 the tornado touched down at Apr 9, 7:18 PM CDT, 32 minutes earlier.
Area forecast discussion, Apr 9, 7:18 PM CDT, 32 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
718 PM CDT THU APR 9 2015
.MESOSCALE DISCUSSION...536 PM CDT
CONTINUE TO MONITOR COLD FRONT WITH STRONG CONVECTION OCCURRING
NEAR THE MISSISSIPPI RIVER THIS HOUR. AHEAD OF THE FRONT WITHIN
THE WARM SECTOR THUNDERSTORMS HAVE STRUGGLED TO REACH THEIR FULL
POTENTIAL WITH MODEST MID LEVEL LAPSE RATES BEING ONE OF THE
PRIMARY LIMITING FACTORS. WIDELY SCATTERED ACTIVITY WILL CONTINUE
AHEAD OF THE FRONT THROUGH MID EVENING...THOUGH GIVEN TRENDS SO
FAR THE THREAT FOR SEVERE WEATHER APPEARS LOW AHEAD OF THE FRONT.
WITH CIRRUS SHIELD OVERSPREADING THE REGION AND LOWERING SUN
ANGLE...THERE ARE RENEWED CONCERNS REGARDING
INSTABILITY...ESPECIALLY AS WE GET CLOSER TO SUNSET THIS EVENING.
EXPECT MODERATE INSTABILITY TO PERSIST THROUGH 00Z THEN FOR A
DIMINISHING TREND OF MLCAPE THEREAFTER.
BY 00Z/7PM CDT...EXPECT THE LINE OF THUNDERSTORMS ASSOCIATED WITH
THE COLD FRONT WHICH WILL MAINTAIN A HIGHER SEVERE THREAT TO BE
NEAR THE I-39 CORRIDOR...AND ENTERING THE WESTERN SUBURBS OF
CHICAGO CLOSER TO 01Z/8PM CDT. LOW LEVEL CONVERGENCE ALONG THE
FRONT REMAINS STRONG AND DEEP LAYER SHEAR REMAINS SUFFICIENT TO
SUSTAIN AT LEAST SOME ORGANIZED/SEVERE THREAT THROUGH THE HEART OF
THE FORECAST AREA...THOUGH DIMINISHING MLCAPE MAY EVENTUALLY LOWER
THAT THREAT.
DEUBELBEISS
&&
.SHORT TERM...
400 AM CDT
TODAY AND TONIGHT...
DENSE FOG CONTINUES IN COOL/SATURATED AIR MASS WITH NORTHEAST
WINDS OFF THE LAKE THIS MORNING...WILL MAINTAIN DENSE FOG ADVISORY
ALONG THE LAKE AS ISSUED.
CLUSTERS OF THUNDERSTORMS WERE OCCURRING EARLY THIS MORNING
ACROSS THE MIDWEST...IN A REGION OF BROAD SOUTHWESTERLY WARM/MOIST
ADVECTION ATOP NEARLY STATIONARY FRONTAL BOUNDARY WHICH STRETCHES
FROM THE CENTRAL PLAINS INTO SOUTHERN IOWA...THEN EAST ACROSS
CENTRAL ILLINOIS AND INDIANA. THESE CLUSTERS OF STORMS WERE
GENERALLY TIED TO INDIVIDUAL MINOR-AMPLITUDE MID-LEVEL SHORT WAVE
FEATURES...AND ASSOCIATED LOCALIZED ENHANCED MOISTURE TRANSPORT
AND ASCENT. TO THE WEST...STRONG UPPER TROUGH WAS MOVING ONTO THE
PLAINS EAST OF THE ROCKIES...AND IS PROGGED TO APPROACH THE MID-
UPPER MISSISSIPPI VALLEY LATE THIS AFTERNOON AS A COMPACT AND
SOMEWHAT NEGATIVELY-TILTED ENERGETIC DISTURBANCE. SURFACE LOW
PRESSURE IN THE VICINITY OF SOUTHWEST KANSAS AT THIS HOUR WILL
DEEPEN AND LIFT TO SOUTHWESTERN WISCONSIN/FAR NORTHWEST IL PER
COMPLIMENTING GUIDANCE SOLUTIONS...WITH THE FRONT LIFTING NORTH AS
A WARM FRONT ACROSS THE FORECAST AREA. THIS PATTERN HAS ALL THE
EARMARKS OF BEING A WIDESPREAD SEVERE WEATHER PRODUCER ACROSS THE
AREA THIS AFTERNOON AND EVENING.
WITH THAT SAID...QUESTIONS REMAIN WITH RESPECT TO EVOLUTION OF
STORMS LATER TODAY...MAINLY DUE TO THE EXPECTATION THAT SEVERAL
CLUSTERS OF STORMS WILL CONTINUE TO DEVELOP/PROPAGATE ACROSS THE
AREA THROUGH MUCH OF THE DAY DUE TO PERSISTENT WARM/MOIST
ADVECTION AND ASCENT IN REGION OF STEEP MID-LEVEL LAPSE RATES
AHEAD OF THE DEEPENING TROUGH AND SURFACE LOW. CONVECTION ALLOWING
GUIDANCE (HRRR/NMM/ARW RUNS) DEPICT SEVERAL CLUSTERS DEVELOPING
AND LIFTING ACROSS THE AREA THROUGH THE MORNING AND MIDDAY
HOURS...AND REGIONAL RADAR MOSAIC SEEMS TO INDICATE THIS WILL BE
THE TREND AT LEAST THROUGH THIS MORNING. THUS WHILE SYNOPTIC
FEATURES WILL BE STRONG...MESOSCALE BOUNDARIES AND FORCING REMAIN
UNCLEAR AT THIS TIME. STILL...STRONG FORCING IN ADVANCE OF COLD
FRONT COUPLED WITH STRONG ASCENT ASSOCIATED WITH COMPACT WAVE
SHOULD BE CAPABLE OF GENERATING ORGANIZED SEVERE STORMS LATER THIS
AFTERNOON. 00Z NAM FORECAST SOUNDINGS INDICATE WARM SECTOR MLCAPES
AROUND 1500-2000 J/KG...WITH AMPLE DEEP AND LOW LEVEL SHEAR. SPC
NOTES SOME UNCERTAINTY WITH RESPECT TO STORM MODE...LINE SEGMENTS
AS OPPOSED TO DISCRETE CELLS...THOUGH SUPERCELLULAR
CHARACTERISTICS ARE LIKELY GIVEN THE ENVIRONMENT. DAMAGING WINDS
FROM LINES/LINE SEGMENTS LOOKS TO BE THE MOST WIDESPREAD
THREAT...THOUGH NORTHERN IL/SOUTHERN WI...WHERE WINDS WILL MOST
LIKELY BE BACKED MORE STRONGLY AHEAD OF THE LOW...WILL STILL HAVE
A REAL TORNADO POTENTIAL. STORMS WILL LIKELY EVOLVE UPSCALE INTO
SQUALL-LINE AS COLD FRONT MOVES ACROSS THE AREA EARLY THIS
EVENING...WITH THUNDERSTORM/SEVERE THREAT QUICKLY WINDING DOWN
BEFORE MIDNIGHT AFTER FROPA.
RATZER
&&
.LONG TERM...
257 PM CDT
FRIDAY THROUGH THURSDAY...
FOLLOWING A PERIOD OF VERY ACTIVE WEATHER...FOLLOWING THE PASSAGE OF
THE COLD FRONT LATE THURSDAY NIGHT...A PERIOD OF RELATIVE CALM WILL
SET UP FOR FRIDAY INTO SUNDAY AS A COOL...DRY HIGH PRESSURE AREA
BUILDS ACROSS THE AREA. TEMPERATURES WILL DROP BACK TO CLOSER TO
SEASONAL HIGHS NORMAL LEVELS WITH HIGHS IN THE UPPER 50S TO AROUND
60F UNDER MOSTLY SUNNY SKIES. AS THE HIGH WILL BE RIGHT OVER THE
AREA FRIDAY NIGHT INTO SATURDAY MORNING...LIGHT WINDS AND A DRY
AIRMASS WILL ALLOW FOR SOME ENHANCED RADIATIVE COOLING OVERNIGHT FOR
LOWS TO DROP BACK INTO THE MIDDLE TO UPPER 30S SATURDAY MORNING.
WITH THE HIGH BEGINNING TO BUILD OFF TO THE EAST THROUGH SATURDAY
NIGHT AND SUNDAY...A RETURN FLOW OF MOISTURE AND WARMER AIR WILL
KEEP THE COOLING TREND VERY BRIEF WITH TEMPS REBOUNDING BACK TO
AROUND 60F OVER MUCH OF THE CWA...WITH THE EXCEPTION OF THE
IMMEDIATE LAKEFRONT...WHICH SHOULD REMAIN COOLER AS A WEAK PRESSURE
GRADIENT AND DIFFERENTIAL HEATING BETWEEN THE COOL LAKE WATER AND
WARMER LAKE SHOULD ALLOW A LAKE BREEZE TO DEVELOP. HIGHS ON
SATURDAY ALONG THE LAKE FRONT TOPPING OUT IN THE MIDDLE 50S.
INCREASING SOUTHERLY FLOW ON THE WESTERN PERIPHERY OF THE HIGH
MOVING OFF TO THE EAST WILL LIKELY PREVENT A LAKE BREEZE FROM
DEVELOPING.
FOR SUNDAY...A NORTHERN STREAM SHORT WAVE MOVING OUT OF THE NRN
ROCKIES SHOULD BEGIN TO PHASE WITH A SOUTHERN STREAM SHORTWAVE
LIFTING INTO THE MIDDLE MISSISSIPPI VALLEY. THIS PHASING SHOULD
RESULT IN AN AMPLIFYING LONG WAVE TROUGH OVER THE MIDDLE AND UPPER
MISSISSIPPI VALLEY AND BRINGING THE NEXT CHANCE OF PCPN TO THE
REGION. THE LONGER RANGE GUIDANCE...IN GENERAL...AGREE ON THE
SCENARIO...BUT DIFFERENCES IN THE TIMING OF THE INDIVIDUAL SHORTWAVE
AND THE DEGREE OF PHASING AND THE RESULTANT STRENGTH OF THE LONG
WAVE TROUGH LEAD TO A RELATIVELY LOW CONFIDENCE FORECAST FOR THE
LATTER PORTIONS OF THE EXTENDED FORECAST PERIOD. CURRENTLY FEEL
THAT A COLD FRONT MOVING ACROSS THE AREA SUNDAY INTO SUNDAY NIGHT
AND THEN SHUTTING OFF BY MONDAY MORNING AS ANOTHER HIGH PRESSURE
SYSTEM MOVES ACROSS THE AREA. WHILE THERE IS MODERATE TO HIGH
CONFIDENCE IN A PERIOD OF PCPN SUNDAY AND SUNDAY NIGHT...START AND
END TIMES REMAIN UNCERTAIN AS WELL AS THE CHANCES FOR THUNDERSTORMS
WITH THE PCPN AND WILL LIKELY BE HIGHLY DEPENDENT ON THE SPEED OF AN
ASSOCIATED COLD FRONT MOVING THROUGH THE AREA. FOR THE LATTER
PORTIONS OF THE FORECAST PERIOD...FROM TUESDAY THROUGH
THURSDAY...THERE COULD BE ANOTHER PERIOD OF UNSETTLED WEATHER AS THE
UPPER LEVEL FLOW PATTERN MAINTAINS A HIGH AMPLITUDE...QUICKLY
PROGRESSIVE PATTERN. THE GFS/ECMWF ARE ACTUALLY SHOWING BETTER
CONSISTENCY FOR THE END OF THE LONGER TERM FORECAST PERIOD THAN
EARLIER...WITH ANOTHER LONG WAVE TROUGH DEVELOPING OVER THE CNTRL
PLAINS. THE ECMWF IS TRENDING A BIT STRONGER AND DEVELOPING MORE OF
A NEGATIVE TILT TO THE TROUGH AND A CLOSED UPPER LOW BY WEDNESDAY
NIGHT...THE GFS IS REMARKABLY SIMILAR...BUT ABOUT 24 HOURS SLOWER IN
DEVELOPING THE NEGATIVE TILT UPPER TROUGH AND CLOSED UPPER LOW.
SHOULD THIS SCENARIO PAN OUT...THE MIDDLE OF NEXT WEAK COULD BE RIPE
FOR ANOTHER PERIOD OF ACTIVE WEATHER.
KREIN
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 00Z...
* SCATTERED STORMS EXPECTED THIS AFTN...WITH THE FINAL ROUND OF
STORMS MOVING THROUGH ARND 2Z-4Z. SOME OF THESE STORMS COULD BE
SEVERE WITH GUSTY WINDS.
* GUSTY SSW WINDS WITH GUSTS ARND 25 KT.
* IFR VSBY EXPECTED WITH TSRA.
* IFR CIGS BEHIND THE LINE OF STORMS OVER NIGHT...BECOMING MVFR
* GUSTY WINDS BCMG SW TO W ARND MIDNIGHT WITH MAX GUSTS 30-35 KT.
KMD
//DISCUSSION...UPDATED 00Z...
STRONGEST THUNDERSTORM ACTIVITY IS IN THE NORTHWEST CORNER OF THE
COUNTY WARNING AREA THIS EVENING...WITH A BROKEN LINE OF STORMS
EXTENDING SOUTH THROUGH WESTERN ILLINOIS EARLY THIS EVENING.
ADDITIONALLY...SOME ISOLATED THUNDESTORMS EXIST OUT AHEAD OF THE
MAIN LINE. WHILE THE LINE FARTHER WEST IS NOT COMPLETELY FILLED IN
YET...AS THE COLD FRONT MAKES EASTWARD PROGRESS...EXPECT THIS LINE
TO BECOME FILLED IN...REACHING THE CHICAGOLAND TERMINALS AROUND
145-2Z. EXPECT SCATTERED THUNDERSTORMS OUT AHEAD OF THIS MAIN
LINE. EXPECT HAIL...STRONG WINDS...AND HEAVY RAIN WITH THESE
STORMS WHEN THEY DO FILL IN. CONFIDENCE IS STILL MEDIUM ON THE
TIMING AND COVERAGE.
AFTER THESE STORMS CLEAR...EXPECT GUSTY WSW WINDS WITH CIGS
LOWERING TO MVFR AND POSSIBLY IFR. LIFTING IS EXPECTED FRIDAY
MORNING BUT CONTINUED GUSTY WINDS.
KMD
//ORD AND MDW CONFIDENCE...UPDATED 00Z...
* HIGH CONFIDENCE IN SCATTERED STORMS EARLY THIS EVENING FOLLOWED
BY A SEGMENT OR SEMI-BROKEN LINE OF STORMS LATER THIS EVENING.
MEDIUM CONFIDENCE IN COVERAGE THIS EVENING AND TIMING.
* MEDIUM CONFIDENCE IN WIND DIRECTION BEHIND THE SCATTERED STORMS.
WINDS COULD BE CHAOTIC FOR A BRIEF PERIOD OF TIME.
* HIGH CONFIDENCE IN REDUCED VSBY UNDER STORMS...MEDIUM-LOW
CONFIDENCE IN CIG HEIGHTS.
* HIGH CONFIDENCE IN LOWER CIGS TONIGHT...LOW ON SPECIFIC HEIGHTS
AND HOW LONG IFR WILL LAST.
* MEDIUM CONFIDENCE IN WIND GUSTS OVERNIGHT AND TOMORROW...GUSTS
COULD BE HIGHER.
KMD
//OUTLOOK FOR ORD/MDW FOR 12Z SATURDAY-12Z THURSDAY...UPDATED
00Z...
* SATURDAY...DRY/VFR. SOUTHWEST WINDS. LAKE BREEZE POSSIBLE.
* SUNDAY...DRY/VFR. GUSTY SOUTH WINDS.
* MONDAY...DRY/VFR. EAST WINDS.
* TUESDAY...CHANCE OF SHRA/TSRA. MVFR POSSIBLE. SOUTH WINDS.
* WEDNESDAY...CHANCE OF SHRA. SOUTH WINDS.
&&
.MARINE...
315 PM CDT
CONDITIONS OVER LAKE MICHIGAN ARE DETERIORATING RAPIDLY
TODAY...FIRST WITH WAVES OF THUNDERSTORMS CROSSING THE SOUTHERN
PORTIONS OF THE LAKE AS A WARM FRONT LIFTS NORTHWARD. AS OF 3PM
CDT...THE FRONT HAD MOVED UP TO THE CENTER OF THE LAKE AND SHOULD
CONTINUE TO LIFT NORTHWARD AS DEEPENING LOW PRESSURE OVER EASTERN
IOWA CONTINUES TO DEEPEN AND TRACKS INTO SOUTHERN WISCONSIN BY EARLY
THIS EVENING. BY THIS POINT...THE SOUTHERLY FLOW WILL REACH ALMOST
TO THE NORTH END OF THE LAKE...BUT WITH STRONG PRESSURE FALLS AND A
STRENGTHENING PRESSURE GRADIENT OVER THE LAKE AS THE SFC LOW
APPROACHES...WINDS OVER THE SRN PORTIONS OF THE LAKE SHOULD INCREASE
TO GALE FORCE FOR THE NEARSHORE WATERS AND THE SOUTH HALF OF THE
LAKE. THUNDERSTORMS WILL ALSO CONTINUE TO BE A CONCERN INTO THE
EVENING AS WELL. THE SFC LOW IS EXPECTED TO TRACK ACROSS THE CNTRL
PORTIONS OF THE LAKE LATE THIS EVENING...WITH WINDS QUICKLY SHIFTING
TO WLY-NWLY. A STRONG NORTHERLY GRADIENT BEHIND THE EXITING
LOW...INCREASING COLD ADVECTION ASSOCIATED WITH A COOL HIGH PRESSURE
SYSTEM DROPPING INTO THE NRN PLAINS AND STRONG PRESSURE RISES AS A
RESULT OF THE COMBINATION OF THE EXITING LOW AND APPROACHING
HIGH...SHOULD ALL COMBINE TO BRING SHORT PERIOD OF WEST TO NWLY
GALES TO THE LAKE INTO FRIDAY AFTERNOON. THE APPROACHING HIGH
SHOULD BEGIN TO OVERSPREAD THE WESTERN GREAT LAKES BY FRIDAY
AFTERNOON...ALLOWING WINDS OVER THE LAKE TO DROP OFF RELATIVELY
QUICKLY. FOR THE WEEKEND AND INTO EARLY NEXT WEEK...CONDITIONS OVER
THE LAKE SHOULD BE RELATIVELY QUIET. ANOTHER COLD FRONT IS EXPECTED
TO SWEEP ACROSS THE LAKE SUNDAY NIGHT OR MONDAY...BUT THIS SHOULD BE
A LESS DYNAMIC SYSTEM...AND WINDS SHOULD NOT GET AS STRONG AS WITH
THE SYSTEM APPROACHING THE LAKE AT THE CURRENT TIME.
KREIN
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...GALE WARNING...LMZ740-LMZ741-LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-
LMZ779 UNTIL 1 PM FRIDAY.
&&
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WWW.YOUTUBE.COM/NWSCHICAGOHazardous weather outlook, Apr 9, 3:28 PM CDT, 4 hours 22 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 328 PM CDT THU APR 9 2015 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 102030- 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- 328 PM CDT THU APR 9 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...THIS AFTERNOON AND TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...SOME MAY BE SEVERE AND PRODUCE: LOCALLY HEAVY RAINFALL RESULTING IN LOCALIZED FLOODING. HAIL UP TO THE SIZE OF QUARTERS DAMAGING WINDS UP TO 70 MPH. FREQUENT CLOUD TO GROUND LIGHTNING. AND POSSIBLY AN ISOLATED TORNADO. AREAS AFFECTED AND TIMING: A COLD FRONT WILL SWEEP WEST TO EAST ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA LATE THIS AFTERNOON THROUGH THE EVENING. DISCUSSION: A COLD FRONT WILL SWEEP ACROSS THE REGION THIS EVENING BRINGING PRIMARILY A THREAT FOR STRONG AND DAMAGING WINDS ALONG WITH A CONCERN FOR A TORNADO. AHEAD OF THE MAIN LINE OF THUNDERSTORMS... SCATTERED THUNDERSTORMS ARE POSSIBLE LATE THIS AFTERNOON INTO THE EARLY EVENING. THE SEVERE WEATHER THREAT SHOULD DIMINISH QUICKLY BEHIND THE FRONT. IN ADDITION TO THE SEVERE WEATHER THREAT...SOME AREAS HAVE ALREADY SEEN HEAVY RAIN TODAY WITH SOILS SATURATED. ADDITIONAL HEAVY RAIN WILL QUICKLY BE CONVERTED TO RUNOFF WITH A CONCERN FOR AT LEAST LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THERE IS A CHANCE OF THUNDERSTORMS LATE SUNDAY AFTERNOON INTO SUNDAY NIGHT...AND AGAIN TUESDAY NIGHT THROUGH THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT. && LMZ740>745-102030- 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- 328 PM CDT THU APR 9 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT. SCATTERED THUNDERSTORMS ARE LIKELY THROUGH LATE THIS EVENING. SOME THUNDERSTORMS MAY BE SEVERE LATE THIS AFTERNOON AND EARLY THIS EVENING. GALE FORCE WINDS ARE EXPECTED LATE THIS EVENING AND OVERNIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. GALE FORCE WINDS ARE LIKELY THROUGH MIDDAY FRIDAY...WITH WINDS AND WAVES REMAINING HAZARDOUS FOR SMALL CRAFT INTO FRIDAY EVENING. THERE IS A CHANCE OF THUNDERSTORMS SUNDAY NIGHT...AND AGAIN TUESDAY NIGHT THROUGH THURSDAY. && LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-102030- 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- 328 PM CDT THU APR 9 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT. THUNDERSTORMS ARE LIKELY ACROSS MAINLY THE SOUTH HALF OF THE LAKE INTO THIS EVENING. SOME STORMS COULD BE SEVERE. GALE FORCE WINDS ARE EXPECTED TONIGHT OVER THE SOUTHERN HALF OF THE LAKE. GALE FORCE WINDS ARE EXPECTED OVER THE NORTHERN HALF OF THE LAKE AFTER MIDNIGHT TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. GALE FORCE WINDS ARE LIKELY THROUGH MIDDAY THURSDAY ON THE SOUTHERN HALF OF THE LAKE. GALE FORCE WINDS ARE LIKELY THROUGH LATE THURSDAY AFTERNOON ON THE NORTHERN HALF OF THE LAKE. THERE IS A CHANCE OF THUNDERSTORMS ON SOUTHERN LAKE MICHIGAN SUNDAY NIGHT...AND AGAIN TUESDAY NIGHT THROUGH THURSDAY. && BMD/KREIN VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE) FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT: WWW.FACEBOOK.COM/NWSCHICAGO WWW.TWITTER.COM/NWSCHICAGO WWW.YOUTUBE.COM/NWSCHICAGO
In the hours before
Local storm report, Apr 9, 7:19 PM CDT, 31 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
719 PM CDT THU APR 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0658 PM HAIL CRYSTAL LAKE 42.23N 88.33W
04/09/2015 E0.88 INCH MCHENRY IL TRAINED SPOTTER
0710 PM TORNADO 4 W KIRKLAND 42.09N 88.93W
04/09/2015 DE KALB IL TRAINED SPOTTER
TOUCHDOWN BETWEEN MONROE CENTER AND FAIRDALE NEAR OGLE
DEKALB COUNTY LINE. DAMAGE REPORTED.
&&
BLocal storm report, Apr 9, 7:28 PM CDT, 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
728 PM CDT THU APR 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0725 PM HAIL CHERRY VALLEY 42.24N 88.96W
04/09/2015 E1.75 INCH WINNEBAGO IL TRAINED SPOTTER
AT US20 AND NELL RD.
&&
BLocal storm report, Apr 9, 7:32 PM CDT, 18 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
732 PM CDT THU APR 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 PM TORNADO 4 NW KIRKLAND 42.13N 88.91W
04/09/2015 DE KALB IL TRAINED SPOTTER
TIME BASED ON RADAR. DAMAGE TO HOUSES AND LARGE TREES
UPROOTED.
&&
KBIRKLocal storm report, Apr 9, 7:45 PM CDT, 5 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
745 PM CDT THU APR 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1042 AM LIGHTNING MOUNT PROSPECT 42.07N 87.94W
04/09/2015 COOK IL TRAINED SPOTTER
LIGHTNING STRIKE 200 E BLOCK PROSPECT AVE. STRUCTURE
FIRE.
0623 PM HAIL 2 SE DIXON 41.83N 89.45W
04/09/2015 M1.00 INCH LEE IL AMATEUR RADIO
0628 PM HAIL 2 SE DIXON 41.83N 89.45W
04/09/2015 M1.75 INCH LEE IL AMATEUR RADIO
HAIL NOW TO GOLF BALL SIZE.
0629 PM FUNNEL CLOUD 2 SE ROCKFORD AIRPORT 42.18N 89.07W
04/09/2015 WINNEBAGO IL TRAINED SPOTTER
REPORTED BY SPOTTER AND THE OBSERVER AT THE AIRPORT.
LOCATION ESTIMATED.
0632 PM HAIL 1 N FRANKLIN GROVE 41.86N 89.30W
04/09/2015 M1.75 INCH LEE IL TRAINED SPOTTER
DAYSDILLE ROAD AND NAYLOR
0636 PM HAIL 1 N FRANKLIN GROVE 41.86N 89.30W
04/09/2015 M1.75 INCH LEE IL TRAINED SPOTTER
0638 PM HAIL 5 N FRANKLIN GROVE 41.91N 89.30W
04/09/2015 E1.75 INCH OGLE IL TRAINED SPOTTER
0640 PM TORNADO 1 E CHERRY VALLEY 42.24N 88.94W
04/09/2015 WINNEBAGO IL LAW ENFORCEMENT
RT 20 AND WHEELER ROAD. PUBLIC REPORT RELAYED VIA BOONE
COUNTY SHERIFF.
0640 PM TORNADO 2 NE FRANKLIN GROVE 41.86N 89.27W
04/09/2015 LEE IL TRAINED SPOTTER
VIEWED FROM I-88. DEBRIS SEEN.
0643 PM TORNADO CHERRY VALLEY 42.24N 88.96W
04/09/2015 WINNEBAGO IL TRAINED SPOTTER
CONFIRMED.
0643 PM TORNADO 5 SE ASHTON 41.82N 89.15W
04/09/2015 LEE IL TRAINED SPOTTER
TORNARDO REPORTED DOING DAMAGE NEAR ASHTON. RELAYED BY
DVN
0645 PM HAIL 2 E MOUNT MORRIS 42.05N 89.39W
04/09/2015 M1.75 INCH OGLE IL TRAINED SPOTTER
0645 PM HAIL HOFFMAN ESTATES 42.06N 88.14W
04/09/2015 E1.00 INCH COOK IL TRAINED SPOTTER
AT INTERSECTION OF WESTBURY AND BAYSIDE. HEAVY RAIN.
0650 PM HAIL HUNTLEY 42.17N 88.42W
04/09/2015 E1.00 INCH MCHENRY IL TRAINED SPOTTER
AT INTERSECTION OF DUNDEE RD AND HALIGHUS.
0656 PM HAIL LAKE IN THE HILLS 42.19N 88.32W
04/09/2015 E0.88 INCH MCHENRY IL TRAINED SPOTTER
PEA TO NICKEL SIZE HAIL
0658 PM HAIL CRYSTAL LAKE 42.23N 88.33W
04/09/2015 E0.88 INCH MCHENRY IL TRAINED SPOTTER
0702 PM TORNADO 5 N HILLCREST 42.02N 89.07W
04/09/2015 OGLE IL TRAINED SPOTTER
SEVERAL REPORTS OF A LARGE WEDGE TORNADO ON THE GROUND.
0710 PM TORNADO 4 W KIRKLAND 42.09N 88.93W
04/09/2015 DE KALB IL TRAINED SPOTTER
TOUCHDOWN BETWEEN MONROE CENTER AND FAIRDALE NEAR OGLE
DEKALB COUNTY LINE. DAMAGE REPORTED.
0715 PM TORNADO 4 NW KIRKLAND 42.13N 88.91W
04/09/2015 DE KALB IL TRAINED SPOTTER
TIME BASED ON RADAR. DAMAGE TO HOUSES AND LARGE TREES
UPROOTED.
0725 PM HAIL CHERRY VALLEY 42.24N 88.96W
04/09/2015 E1.75 INCH WINNEBAGO IL TRAINED SPOTTER
AT US20 AND NELL RD.
&&
BLocal storm report, Apr 9, 7:48 PM CDT, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
748 PM CDT THU APR 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0740 PM TORNADO 1 W MARENGO 42.25N 88.62W
04/09/2015 MCHENRY IL EMERGENCY MNGR
ROUTE 20 AND JOHNSON ROAD. BETWEEN MARENGO AND GARDEN
PRAIRIE
&&
DONOFRIOLocal storm report, Apr 9, 7:50 PM CDT, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
750 PM CDT THU APR 09 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0640 PM TORNADO ASHTON 41.87N 89.22W
04/09/2015 LEE IL TRAINED SPOTTER
REPORT OF DAMAGE AND INJURIES AT THE KRAFT FOOD WAREHOUSE
NEAR ASHTON. TIME ESTIMATED FROM RADAR.
&&
KBIRKThe air that afternoon
The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.
Davenport, (KDVN), 00:00Z
0.8 hours before the tornado, 184 km from the path. April 10, 2015.
- Mixed-layer CAPE
- 338 J/kg
- Mixed-layer CIN
- -52 J/kg
- Surface CAPE
- 375 J/kg
- Mixed-layer LCL
- 1114 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.4
- 0-3 km lapse rate
- 5.5 K/km
Davenport, (KDVN), 12:00Z
11.2 hours after it, 184 km from the path. April 10, 2015.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- -112079 J/kg
- Surface CAPE
- 0 J/kg
- Mixed-layer LCL
- 1240 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -227 m²/s²
- 0-3 km storm-relative helicity
- -185 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
- 0-3 km lapse rate
- 3.6 K/km
The surface observations
Burlington (BUU), 37 km from the path, in the two hours either side.
| Time (UTC) | Temp (°F) | Dew point (°F) | Wind | Gust (kt) | Pressure (mb) | Weather |
|---|---|---|---|---|---|---|
| 22:55 UTC | 51 | 50.54 | 110° 6 kt | 1000 | ||
| 23:15 UTC | 51 | 51 | 120° 4 kt | 999.7 | -RA | |
| 23:35 UTC | 51 | 51 | 60° 3 kt | 999.3 | -RA | |
| 23:55 UTC | 51 | 50.54 | 120° 6 kt | 998.3 | BR | |
| 00:15 UTC | 51 | 51 | 100° 5 kt | 998.3 | RA | |
| 00:35 UTC | 49.28 | 49 | 140° 3 kt | 999.3 | +RA | |
| 00:55 UTC | 53.42 | 53.42 | 0° 0 kt | 998.3 | -SN | |
| 01:15 UTC | 52.34 | 52.16 | 70° 6 kt | 997 | -RA | |
| 01:35 UTC | 52.34 | 52.16 | 10° 8 kt | 998 | -RA | |
| 01:55 UTC | 49.28 | 49 | 100° 4 kt | 997 | -RA | |
| 02:15 UTC | 51 | 51 | 170° 4 kt | 996.3 | BR | |
| 02:35 UTC | 52.88 | 52.88 | 170° 5 kt | 995.9 |
From the Iowa Environmental Mesonet's archive of airport observations.
What was reported nearby
Local storm reports within 60 km of the path, in the three hours either side.
| Time (UTC) | Report | Where | County | Remark |
|---|---|---|---|---|
| 23:29 UTC | FUNNEL CLOUD | 2 Se Rockford Airport | Winnebago, IL | REPORTED BY SPOTTER AND THE OBSERVER AT THE AIRPORT. LOCATION ESTIMATED. |
| 23:37 UTC | TORNADO | 3 S Cherry Valley | Winnebago, IL | RATING: EF-0 ESTIMATED PEAK WIND: 65 MPH PATH LENGTH /STATUTE/: 2.8 MILES PATH WIDTH /MAXIMUM/: 25 YARDS START DATE: APRIL 09 2015 START TIME:6:37 PM CDT START LOCATION: 2.9 MILES S CHERRY VALLEY START LAT/LON: 42.1926/- |
| 23:40 UTC | TORNADO | 1 E Cherry Valley | Winnebago, IL | RT 20 AND WHEELER ROAD. PUBLIC REPORT RELAYED VIA BOONE COUNTY SHERIFF. |
| 23:43 UTC | TORNADO | Cherry Valley | Winnebago, IL | CONFIRMED. |
| 23:45 UTC | HAIL 1 | Hoffman Estates | Cook, IL | AT INTERSECTION OF WESTBURY AND BAYSIDE. HEAVY RAIN. |
| 23:50 UTC | HAIL 1 | Huntley | Mchenry, IL | AT INTERSECTION OF DUNDEE RD AND HALIGHUS. |
| 23:56 UTC | HAIL 0.88 | Lake In The Hills | Mchenry, IL | PEA TO NICKEL SIZE HAIL |
| 23:58 UTC | HAIL 0.88 | Crystal Lake | Mchenry, IL | |
| 00:04 UTC | HAIL 0.75 | Capron | Boone, IL | |
| 00:05 UTC | TORNADO | 11 Nne Rochelle | Ogle, IL | RATING: EF-0 ESTIMATED PEAK WIND: 65 MPH PATH LENGTH /STATUTE/: 1.9 MILES PATH WIDTH /MAXIMUM/: 100 YARDS START DATE:APRIL 09 2015 START TIME:7:05 PM CDT START LOCATION:2.9 MILES E LINDENWOOD START LAT/LON: 42.0583/-88.9 |
| 00:10 UTC | TORNADO | 4 W Kirkland | De Kalb, IL | TOUCHDOWN BETWEEN MONROE CENTER AND FAIRDALE NEAR OGLE DEKALB COUNTY LINE. DAMAGE REPORTED. |
| 00:15 UTC | TORNADO | 3 Nnw Kirkland | De Kalb, IL | RATING: EF-1 ESTIMATED PEAK WIND: 110 MPH PATH LENGTH /STATUTE/: 4.0 MILES PATH WIDTH /MAXIMUM/: 100 YARDS START DATE: APRIL 09 2015 START TIME: 7:15 PM CDT START LOCATION: 3.1 MILES NW KIRKLAND START LAT/LON: 42.1334/-8 |
| 00:15 UTC | TORNADO | 4 Nw Kirkland | De Kalb, IL | TIME BASED ON RADAR. DAMAGE TO HOUSES AND LARGE TREES UPROOTED. |
| 00:24 UTC | TORNADO | 3 S Belvidere | Boone, IL | RATING: EF-0 ESTIMATED PEAK WIND: 85 MPH PATH LENGTH /STATUTE/: 0.4 MILES PATH WIDTH /MAXIMUM/: 30 YARDS START DATE: APRIL 09 2015 START TIME:7:24 PM CDT START LOCATION: 3.8 MILES S BELVIDERE START LAT/LON: 42.2073/-88.8 |
| 00:25 UTC | HAIL 1.75 | Cherry Valley | Winnebago, IL | AT US20 AND NELL RD. |
| 00:25 UTC | TORNADO | 6 Se Belvidere | Boone, IL | RATING: EF-1 ESTIMATED PEAK WIND: 110 MPH PATH LENGTH /STATUTE/: 3.9 MILES PATH WIDTH /MAXIMUM/: 50 YARDS START DATE: APRIL 09 2015 START TIME:7:25 PM CDT START LOCATION: 6 MILES SE BELVIDERE START LAT/LON: 42.2442/-88.7 |
| 00:34 UTC | TORNADO | Belvidere | Boone, IL | POSSIBLE TORNADO DAMAGE NEAR BELVIDERE. TIME BASED ON RADAR. |
| 00:35 UTC | TORNADO | 1 S Harvard | Mchenry, IL | IL23 AND STREIT ST. DEBRIS - SHEET METAL AND SIDING. |
| 00:35 UTC | TORNADO | 1 S Harvard | Mchenry, IL | IL23 AND STREIT ST. DEBRIS-SHEET METAL AND SIDING. |
| 00:40 UTC | TORNADO | 1 W Marengo | Mchenry, IL | ROUTE 20 AND JOHNSON ROAD. BETWEEN MARENGO AND GARDEN PRAIRIE |
| 00:50 UTC | TORNADO | 5 Ese Harvard | Mchenry, IL | RATING: EF-1 ESTIMATED PEAK WIND: 90 MPH PATH LENGTH /STATUTE/: 0.3 MILES PATH WIDTH /MAXIMUM/: 30 YARDS START DATE: APRIL 09 2015 START TIME: 7:50 PM CDT START LOCATION: 4.4 MILES EAST SOUTHEAST OF HARVARD START LAT/LON |
| 01:08 UTC | HAIL 1 | 1 Ne Union | Mchenry, IL | ALONG IL-176. |
| 01:15 UTC | HAIL 1 | Mchenry | Mchenry, IL | BULL VALLEY RD AND GREEN STREET. |
| 01:15 UTC | HAIL 1 | Woodstock | Mchenry, IL | DIME TO QUARTER SIZE HAIL |
| 01:17 UTC | HAIL 1 | Woodstock | Mchenry, IL | TROOP ST AND KISHWAUKEE. |
| 01:27 UTC | HAIL 1 | Mchenry | Mchenry, IL | DARKMOR AND CRYSTAL LAKE RD. |
| 01:28 UTC | HAIL 1 | Woodstock | Mchenry, IL | FLEMING ROAD AND BULL VALLEY ROAD. |
| 02:30 UTC | FLOOD | 1 W Beach Park | Lake, IL | 0.89 IN LAST 40 MINUTES. STORM TOTAL FROM LAST NIGHT TO TONIGHT IS 3.10 INCHES. SOME ROAD WAYS FLOODED AND ROAD SHOULDERS WASHED OUT. |
From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.
This ground now
The live radar over the trackEvery 2015 tornado in IllinoisEvery tornado in Illinois since 1950Warnings in force in Illinois nowThe forecast where you are
The other tornadoes of April 9, 2015
18 more were confirmed in the United States that day.
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|---|---|---|---|---|---|---|---|
| April 9 | 1:32 PM CDT | EF0 | Peoria, IL | 0.1 | 10 | |||
| April 9 | 5:04 PM CDT | EF1 | Scott, IA | 22.4 | 100 | $20,000 | ||
| April 9 | 6:22 PM EDT | EF0 | Hillsdale, MI | 0.6 | 70 | |||
| April 9 | 5:40 PM CDT | EF1 | Clinton, IA to IL | 12.5 | 75 | |||
| April 9 | 6:02 PM CDT | EF1 | Carroll, IL | 8.3 | 50 | |||
| April 9 | 6:37 PM CDT | EF0 | Boone, IL | 2.8 | 25 | |||
| April 9 | 6:38 PM CDT | EF2 | Cherokee, TX | 1.8 | 340 | $300,000 | ||
| April 9 | 6:39 PM CDT | EF4 | Rochelle–Fairdale tornado, IL | 30.1 | 700 | 2 | 11 | $19 million |
| April 9 | 7:05 PM CDT | EF0 | Ogle, IL | 1.9 | 100 | |||
| April 9 | 7:10 PM CDT | EF1 | Gregg, TX | 1.3 | 335 | $1.0 million | ||
| April 9 | 7:15 PM CDT | EF1 | Boone, IL | 4.0 | 100 | $80,000 | ||
| April 9 | 7:20 PM CDT | EF1 | Harrison, TX | 4.5 | 760 | $300,000 | ||
| April 9 | 7:24 PM CDT | EF0 | Boone, IL | 0.4 | 30 | $20,000 | ||
| April 9 | 7:25 PM CDT | EF1 | Boone, IL | 3.9 | 50 | $150,000 | ||
| April 9 | 7:47 PM CDT | EF0 | Christian, IL | 0.1 | 10 | |||
| April 9 | 9:08 PM CDT | EF0 | Custer, OK | 0.2 | 30 | |||
| April 9 | 9:16 PM CDT | EF0 | Cape Girardeau, MO | 1.8 | 150 | $6,000 | ||
| April 9 | 9:31 PM CDT | EF0 | Cape Girardeau, MO | 1.7 | 130 | $60,000 |
What this means
Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.
Sources
NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.