Hail and Damaging Winds in Illinois, April 5 to 6, 2010

Name: Hail and Damaging Winds in Illinois, April 5 to 6, 2010
Start: 2010-04-05T20:00
End: 2010-04-06T00:16
Location: Illinois

April 5 to 6, 2010 · NWS LOT · 65 events in 8 counties and zones

Strong to severe thunderstorms moved across northern Illinois during the evening hours of April 5th into the early morning hours of April 6th. Large hail and wind damage were reported in many areas.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 1
Property damage: $1.4 million
Crop damage: None recorded
Events: 65

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS LOT wrote it up.

Strong to severe thunderstorms moved across northern Illinois during the evening hours of April 5th into the early morning hours of April 6th. Large hail and wind damage were reported in many areas. Hail the size of baseballs was reported in Des Plaines.

What forecasters said that day

The local office's own words before the first event, 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 first event at Apr 5, 7:09 PM CST, 51 minutes earlier.

Area forecast discussion, Apr 5, 7:09 PM CST, 51 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
809 PM CDT MON APR 5 2010

.DISCUSSION...
809 PM CDT

MESO UPDATE...

CONVECTIVE TRENDS CONTINUING TO BE MONITORED THIS EVENING WITH
RATHER CONDITIONAL THREAT OF SEVERE WEATHER EXISTING ACROSS THE
CWA.

WARM FRONT THAT HAS BEEN SITUATED SOUTH OF THE AREA ALL DAY
CONTINUES TO LIFT NORTH THIS EVENING...STRETCHING FROM NEAR
MACOMB TO CHAMPAIGN TO JUST NORTH OF INDIANAPOLIS AT 00Z.
ALOFT...VWP/PROLIER DATA INDICATE COUPLE OF LOW AMPLITUDE
SHORTWAVES EMBEDDED IN SW FLOW. FIRST IS MAKING ITS WAY NORTHEAST
NEAR DVN...WITH STRONGER WAVE LOCATED FURTHER SOUTH NEAR KANSAS
CITY. 00Z RAOBS AND SPC/RUC MESOANALYSIS INDICATE ROUGHLY 2000 J/K
MUCAPE SOUTH OF WARM FRONT...WITH A RATHER SHARP GRADIENT NORTH OF
THE WARM FRONT TOWARD IL/WI STATE LINE. ELEVATED CONVECTION ACROSS
IA HAS BEEN FORMING IN AIR MASS WITH RATHER WEAK MUCAPE VALUES
/LESS THAN 500 J/K/...BUT ALONG NORTHERN EDGE OF 850 MB THETA-E
ADVECTION.

BIG QUESTION THIS EVENING SURROUNDS WHETHER SEVERE CONVECTION WILL
FIRE ACROSS OR SOUTH OF THE AREA THIS EVENING AS 850 MB WIND
SPEEDS/LLJ START TO INCREASE THIS EVENING...AS WELL AS IN RESPONSE
TO PREVIOUSLY MENTIONED SHORTWAVE NEAR KANSAS CITY. ASSUMING THAT
INITIATION DOES INDEED TAKE PLACE...NEXT QUESTION IS JUST HOW LONG
THE LOT CWA REMAINS IN ZONE OF ELEVATED CONVECTION BEFORE WARM
FRONT SURGES NORTH OF THE AREA AND FOCUS FOR THUNDERSTORMS MOVES
INTO WISCONSIN.

AT THIS TIME...APPEARS THAT MOST FAVORED TIME FOR
CONVECTION MAY BE THROUGH THE 07-08Z TIME FRAME AS NORTHERN MO
SHORTWAVE BEGINS TO INFLUENCE AREA NORTH OF SURFACE WARM FRONT AND
850 MB THETA-E ADVECTION INCREASES SOMEWHAT. ENVIRONMENT BULK
SHEAR VALUES ARE QUITE STRONG...IN THE NEIGHBORHOOD OF 80 KTS FROM
0-6KM. FOR THOSE UPDRAFTS THAT ARE ABLE TO BECOME
ESTABLISHED...SHEAR VALUES WOULD SUPPORT RAPID STORM ORGANIZATION.
STABLE BOUNDARY LAYER SUGGESTS THAT CONVECTION WOULD REMAIN
ELEVATED IN NATURE. THIS...COMBINED WITH RATHER LOW FREEZING
LEVELS...WOULD SUPPORT LARGE HAIL AS THE PRIMARY THREAT WITH ANY
STRONG STORMS.

BOXELL

&&

.PREV DISCUSSION...
311 PM CDT

FORECAST CONCERNS FOCUS ON CONVECTIVE TRENDS IN NEAR TERM AND
THROUGH EARLY PART OF THE WEEK. CONDITIONAL SEVERE AND HEAVY
RAINFALL POTENTIALS ARE MAIN CONCERNS.

COLD FRONT WHICH PUSHED THROUGH FORECAST AREA LAST NIGHT HAS SETTLED
ACROSS SOUTHERN IL/IND TODAY...WITH WEAK HIGH PRESSURE RIDGE SLIDING
EAST ACROSS CWA. WESTERN PORTION OF FRONT ACROSS KS/MO ALREADY
SURGING NORTHWARD AS WARM FRONT HOWEVER...IN RESPONSE TO PRESSURE
FALLS ACROSS THE PLAINS INDUCED BY SERIES OF SHORT WAVE IMPULSES
PROPAGATING THROUGH FAST SOUTHWEST FLOW IN MID/UPPER LEVELS. LATEST
PROFILER AND SPC/RUC MESOANALYSIS DATA INDICATES PERSISTENT 35 KT
LOW LEVEL JET ACROSS FRONTAL ZONE FROM EASTERN KS INTO WESTERN MO/SW
IA...AND THIS HAS MAINTAINED AREA OF ELEVATED CONVECTION THROUGH THE
DAY WHICH IS NOW EXPANDING NORTHEASTWARD IN REGION OF BROAD
WARM/MOIST ADVECTION ACROSS IA/WESTERN IL. NUMERICAL GUIDANCE
INDICATES THIS ELEVATED CONVECTION WILL CONTINUE TO INCREASE IN
COVERAGE AND INTENSITY THROUGH LATE AFTERNOON/EVENING AHEAD OF
DEEPENING LOW PRESSURE ACROSS THE PLAINS AS LARGE SCALE UPPER TROUGH
CONTINUES TO AMPLIFY AND MOVE EAST. WRF-NAM FORECAST SOUNDINGS
ACROSS NORTHERN IL INDICATE ELEVATED INSTABILITY TO INCREASE THIS
EVENING IN MOIST ADVECTION ON NOSE OF LOW LEVEL JET...EVENTUALLY
INCREASING TO 500-1000 J/KG FOR ELEVATED PARCELS OVERNIGHT. COUPLED
WITH STRONG 0-6 KM BULK SHEAR ON THE ORDER OF 60 KTS SUGGESTS
POTENTIAL FOR LARGE HAIL AND POSSIBLY DAMAGING WIND GUSTS WITH
STRONGER ORGANIZED STORMS. TORNADO THREAT HIGHER WEST/SOUTHWEST OF
CWA WHERE SFC WARM FRONT JUXTAPOSED WITH BEST NEAR-SFC BASED
INSTABILITY INTO THIS EVENING...AND WHILE PERHAPS NOT NIL THE
TORNADO THREAT SHOULD DECREASE OVERNIGHT AS FRONT LIFTS INTO
NORTHERN IL/IN AND BOUNDARY LAYER BECOMES MORE STABLE. SFC WARM
FRONT FORECAST TO LIFT ACROSS THE CWA LATE THIS EVENING AND
OVERNIGHT...WITH GUIDANCE IN PRETTY GOOD AGREEMENT IN LOCATING
BOUNDARY OVER NORTHERN COUNTIES OF CWA ROUGHLY NORTH OF I-88 BY
MORNING.

GIVEN WEST-EAST ORIENTATION OF THE WARM FRONTAL ZONE AND
SOUTHWESTERLY LOW LEVEL JET...SOME THREAT OVERNIGHT FOR TRAINING
CONVECTION PARTICULARLY NORTH OF BOUNDARY FROM NORTHERN IA INTO FAR
NW IL/SOUTHWEST WI. FORECAST PRECIPITABLE WATER VALUES BETWEEN
1.25-1.50 INCHES ESPECIALLY THROUGH THIS EVENING...THOUGH SOME MID
LEVEL DRYING NOTED IN FORECAST SOUNDINGS LATE TONIGHT. FLASH FLOOD
GUIDANCE ACROSS NORTHWESTERN PARTS OF CWA IN 1.5-3.0 INCH RANGE
WHICH IS ABOVE CURRENT QPF FOR TONIGHT. CONSIDERED HOISTING FLASH
FLOOD WATCH...THOUGH HAVE CHOSEN TO HOLD OFF AT THIS TIME. FRONT
LIFTS INTO WISCONSIN TUESDAY...WITH FORECAST SOUNDINGS INDICATING
FAIRLY STOUT CAP ACROSS WARM SECTOR. THUS EXPECT A SHARP CUTOFF TO
ONGOING CONVECTIVE THREAT FAR NORTH...AND WARM...HUMID BUT PRECIP
FREE CONDITIONS ACROSS THE SOUTHERN PARTS OF THE CWA.

MAIN WESTERN TROUGH SLOWLY APPROACHES WEDNESDAY WITH SFC SYSTEM AND
COLD FRONT MOVING THROUGH DURING THE DAY. THIS WILL HERALD A SHIFT
BACK TO COOLER WX. SHOWER CHANCE LINGERS INTO THURSDAY ESPECIALLY
EASTERN COUNTIES AS A SECONDARY SHORT WAVE AND ASSOCIATED SFC TROUGH
ROTATES SOUTHEAST ACROSS REGION...THEN DRY AND WARMER WEATHER LOOKS
TO RETURN FOR THE END OF THE WEEK AS BROAD UPPER RIDGE DEVELOPS
ACROSS THE AREA ONCE AGAIN. FAIRLY DECENT MODEL AGREEMENT THROUGH
EXTENDED...WITH INDICATION OF COLD FRONT SAGGING ACROSS NORTHERN
LAKES AND WI/MICH OVER THE WEEKEND. FOR NOW APPEARS FRONT WILL
REMAIN JUST OFF TO OUR NORTH.

RATZER

&&

.AVIATION...
720 PM CDT

0000 UTC TAFS...CONVECTIVE POTENTIAL AND WINDS WILL REMAIN THE
MAIN AVIATION FORECAST ISSUES.

SURFACE WARM FRONT EXTENDING FROM NORTHERN MISSOURI INTO CENTRAL
ILLINOIS SHOULD CONTINUE TO LIFT NORTHWARD OVERNIGHT. STRONG LOW
LEVEL WARM ADVECTION NORTH OF THIS SURFACE FRONT ASSOCIATED WITH
A STRENGTHENING LOW LEVEL JET SHOULD CONTINUE TO PROMOTE SCATTERED
THUNDERSTORM DEVELOPMENT ACROSS THE TERMINALS. COVERAGE IS ALSO
EXPECTED TO INCREASE LATE THIS EVENING AS A SHORT WAVE ACROSS
WESTERN IOWA MOVES INTO SOUTHERN WISCONSIN. IT STILL APPEARS AS
THOUGH GREATEST THREAT OF THUNDER WILL BE ACROSS FAR NORTHERN
ILLINOIS INTO SOUTHERN WISCONSIN WITH GYY LIKELY SEEING THE LOWEST
PROBABILITIES OF THUNDER. HAVE INCLUDED THUNDER MENTION IN TAFS
AFTER THE 03Z-04Z TIME FRAME WITH EARLIER TIMING AT RFD IN CLOSER
PROXIMITY TO STRONGER LOW LEVEL JET FORCING. GIVEN STORMS ARE
LIKELY TO BE ELEVATED IN NATURE...WIND THREAT IS FAIRLY LOW AND
MAIN CONCERN GIVEN ELEVATED INSTABILITY WILL BE ON HAIL POTENTIAL.
TOWARD 12Z...SHOULD START TO SEE MAIN FOCUS FOR ADDITIONAL SHOWERS
AND STORMS SHIFT NORTH AND NORTHEAST OF THE FORECAST AREA AS LOW
LEVEL WARM FRONT LIFTS NORTH AND AS IOWA SHORT WAVE SHIFTS INTO
GREAT LAKES REGION.

LAKE BREEZE WHICH PUSHED TROUGH ORD/MDW HAS NOW MOVED THROUGH GYY
AND RADAR IMAGERY SFC OBS INDICATING LAKE BREEZE BOUNDARY BECOMING
LESS DISTINCT WITH GENERAL FAVORING TO SOUTHEAST GRADIENT ACROSS
ALL TERMINALS NORTH OF SHARPENING LOW LEVEL WARM FRONT. WINDS WILL
SHIFT TO THE SOUTH OVERNIGHT ACROSS GYY/MDW AND THEN BY EARLY TO MID
MORNING TUESDAY FOR ORD/MDW/DPA. FRONT MAY GET HUNG UP ACROSS
NORTHERN SUBURBS BUT AT THIS TIME EXPECTING TERMINALS TO BE SOUTH
OF THE WARM FRONT BY AFTERNOON. EXTENT OF CONVECTIVE ACTIVITY
OVERNIGHT ALSO WILL PLAY SOME ROLE IN DETERMINING WHERE THIS
BOUNDARY SETS UP. GUSTS ALSO TO BECOME STRONGER AGAIN SOUTH OF THE
WARM FRONT WITH FORECAST SOUNDINGS SUGGESTING 25 TO 30 KNOT GUSTS
POSSIBLE TUESDAY AFTERNOON. KEPT TAFS DRY AFTER EARLY MORNING
TUESDAY WITH CONFIDENCE LOW ON ADDITIONAL PRECIP UNTIL LATE
TUESDAY NIGHT INTO WEDNESDAY.

MARSILI

&&

.MARINE...

300 PM...A LOW PRESSURE SYSTEM MOVING OUT OF THE CENTRAL ROCKIES WILL
LIFT NORTHEAST OVER THE NEXT FEW DAYS. A STRONG WARM FRONT ASSOCIATED
WITH THIS LOW WILL MOVE SOUTHERN ILLINOIS NORTH TO NEAR THE IL/WI
BORDER BY TUESDAY MORNING.  THIS WARM FRONT WILL REMAIN NEARLY
STATIONARY OVER SOUTHERN LAKE MICHIGAN THROUGH WEDNESDAY MORNING.
WINDS OVER THE SOUTHERN TIP OF THE LAKE WILL INCREASE TO NEAR 30 KT
SOUTH OF THE WARM FRONT.  AS THE FRONT SURGES NORTH TUESDAY NIGHT
AND WEDNESDAY...STRONGER SOUTH WINDS WILL SPREAD NORTHWARD.  AS THE
LOW TRACKS OFF TO THE NORTHEAST...WINDS WILL TURN AROUND NORTHERLY
AND INCREASE TO AROUND 30 KNOTS AGAIN.  WHILE GALES ARE NOT EXPECTED
AT THIS TIME...A SMALL CRAFT ADVISORY WILL LIKELY BE NEEDED FROM
TUESDAY NIGHT THROUGH THURSDAY.

KREIN

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...NONE.
&&

Hazardous weather outlook, Apr 5, 2:55 PM CST, 5 hours 5 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
355 PM CDT MON APR 5 2010

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
062100-
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-
355 PM CDT MON APR 5 2010 /455 PM EDT MON APR 5 2010/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

   THUNDERSTORMS...SOME STORMS MAY BE SEVERE WITH:
     DAMAGING WINDS IN EXCESS OF 60 MPH.
     AND LARGE HAIL UP TO THE SIZE OF HALF DOLLARS.

  AREAS AFFECTED AND TIMING:

   SCATTERED THUNDERSTORMS WILL BECOME MORE NUMEROUS DURING THE
   LATE AFTERNOON AND EVENING HOURS. THUNDERSTORMS WILL BECOME
   MOST LIKELY NORTH OF INTERSTATE 80 DURING THE OVERNIGHT HOURS.

  DISCUSSION:

   A WARM FRONT WILL LIFT NORTH ACROSS THE REGION OVERNIGHT...IN
   ADVANCE OF AN AREA OF LOW PRESSURE DEEPENING ACROSS THE PLAINS.
   SCATTERED THUNDERSTORMS WILL BECOME MORE NUMEROUS ALONG AND
   NORTH OF THE WARM FRONT AS WARM...MOIST AND UNSTABLE AIR IS
   LIFTED OVER THE WARM FRONTAL BOUNDARY. RELATIVELY STRONG MID
   AND UPPER LEVEL WINDS WILL SUPPLY ENOUGH SHEAR FOR ORGANIZED
   STORMS TO PRODUCE LARGE HAIL AND POSSIBLY DAMAGING WIND GUSTS
   IN EXCESS OF 60 MPH. LOCALLY HEAVY RAINFALL OF AN INCH OR MORE
   IS ALSO POSSIBLE...PARTICULARLY OVER NORTHWEST AND NORTH
   CENTRAL ILLINOIS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THERE IS A CHANCE OF THUNDERSTORMS TUESDAY THROUGH WEDNESDAY. SOME
STORMS MAY BE SEVERE...PARTICULARLY LATE TUESDAY AND AGAIN
WEDNESDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS MAY BE NEEDED TONIGHT.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

LMZ740>745-062100-
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-
355 PM CDT MON APR 5 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.

THUNDERSTORMS ARE LIKELY TONIGHT. SOME STORMS MAY BE SEVERE WITH
LARGE HAIL AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

STRONG WINDS AND HIGH WAVES WILL LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT TUESDAY...AND WILL LIKELY CONTINUE THROUGH THURSDAY.

THERE IS A CHANCE OF THUNDERSTORMS TUESDAY THROUGH WEDNESDAY.

&&

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-
870-872-874-876-878-062100-
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-
355 PM CDT MON APR 5 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...TONIGHT.

THUNDERSTORMS WILL AFFECT SOUTHERN LAKE MICHIGAN TONIGHT. ISOLATED
THUNDERSTORMS ARE POSSIBLE ACROSS NORTHERN LAKE MICHIGAN.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THERE IS A CHANCE OF THUNDERSTORMS ACROSS MAINLY SOUTHERN LAKE
MICHIGAN TUESDAY THROUGH WEDNESDAY.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

RATZER

In the hours before

Local storm report, Apr 5, 4:48 PM CST, 3 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
548 PM CDT MON APR 05 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0545 PM     HAIL             5 N STILLMAN VALLEY     42.18N 89.18W
04/05/2010  M0.75 INCH       OGLE               IL   TRAINED SPOTTER

&&

NMARSILI

Special weather statement, Apr 5, 4:51 PM CST, 3 hours 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
551 PM CDT MON APR 5 2010

ILZ003>005-008-011-012-052315-
BOONE IL-DEKALB IL-KANE IL-MCHENRY IL-OGLE IL-WINNEBAGO IL-
551 PM CDT MON APR 5 2010

...A STRONG THUNDERSTORM WILL AFFECT EXTREME NORTHWESTERN KANE...
NORTHEASTERN OGLE...NORTHERN DEKALB...SOUTHEASTERN WINNEBAGO...
SOUTHERN BOONE AND SOUTHWESTERN MCHENRY COUNTIES...

AT 546 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR ROCKFORD
AIRPORT...MOVING EAST AT 45 MPH.

THIS STORM WILL PRODUCE HAIL UP TO PENNY SIZE.

THIS STORM WILL BE NEAR BELVIDERE AROUND 600 PM...MARENGO...UNION AND
UNION AROUND 615 PM.

LAT...LON 4241 8859 4217 8834 4206 8916 4224 8923

BOXELL

Special weather statement, Apr 5, 7:49 PM CST, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
849 PM CDT MON APR 5 2010

ILZ003-008-060215-
OGLE IL-WINNEBAGO IL-
849 PM CDT MON APR 5 2010

...A STRONG THUNDERSTORM WILL AFFECT OGLE AND SOUTHERN WINNEBAGO
COUNTIES...

AT 843 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 16 MILES SOUTHWEST
OF FREEPORT...MOVING EAST AT 55 MPH.

THIS STORM WILL PRODUCE HAIL UP TO PENNY SIZE. EXPECT INTENSE
LIGHTNING FROM THIS STORM. DO NOT STAY IN THE OPEN OR SEEK SHELTER
UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A
THUNDERSTORM APPROACHES.

THIS STORM WILL BE NEAR FORRESTON AROUND 855 PM...LEAF RIVER...
ADELINE...AND MOUNT MORRIS AROUND 900 PM...OREGON AROUND 905 PM...
BYRON AROUND 910 PM...ROCKFORD AIRPORT...STILLMAN VALLEY...NEW
MILLFORD AND DAVIS JUNCTION AROUND 915 PM.

LAT...LON 4220 8969 4220 8941 4227 8941 4236 8895
      4196 8896 4196 8969 4219 8970

BOXELL

Local storm report, Apr 5, 7:50 PM CST, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
850 PM CDT MON APR 05 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0845 PM     HAIL             MORTON GROVE            42.04N 87.79W
04/05/2010  E0.25 INCH       COOK               IL   TRAINED SPOTTER

&&

IZZI

Local storm report, Apr 5, 7:51 PM CST, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
851 PM CDT MON APR 05 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0845 PM     HAIL             BATAVIA                 41.85N 88.30W
04/05/2010  E0.50 INCH       KANE               IL   PUBLIC

&&

NMARSILI

The radar

The Quad Cities radar (KDVN), 85 km away, was scanning. The volume nearest the first event began at 02:01 UTC.

Open the radar archive at this moment

Event by event

36 hail, 27 thunderstorm wind, 2 lightning. Local standard time, as filed.

Thunderstorm Wind, Ogle

When: April 5, 8:00 PM CST
Where: Ogle County, 0.78 mi N of Hazelhurst
Measured: 70 kt (81 mph) estimated gust
Property damage: $75,000
Reported by: Newspaper
Coordinates: 41.981, -89.682

A corn crib was completely destroyed along Brookville Road, spilling about 18,000 bushels of corn. A machine shed was also destroyed at the same location. Roof and window damage was reported to other buildings in the area. Trees, tree limbs and power lines were also blown down. Windows were broken on a tractor.

Thunderstorm Wind, Ogle

When: April 5, 8:02 PM CST
Where: Ogle County, 1 mi W of Polo
Measured: 56 kt (64 mph) estimated gust
Reported by: Law Enforcement
Coordinates: 41.980, -89.600

Trees were blown down just west of Polo.

Thunderstorm Wind, Ogle

When: April 5, 8:02 PM CST
Where: Ogle County, 0.65 mi NNE of Buffalo Grove
Measured: 56 kt (64 mph) estimated gust
Property damage: $5,000
Reported by: Newspaper
Coordinates: 41.989, -89.595

The roof of a hog house was blown off along Eagle Point Road.

Thunderstorm Wind, Ogle

When: April 5, 8:05 PM CST
Where: Ogle County, 2.74 mi NE of Buffalo
Measured: 65 kt (75 mph) estimated gust
Property damage: $25,000
Reported by: Newspaper
Coordinates: 42.026, -89.540

A grain elevator was damaged at a farm on Canada Road. Part of the elevator fell onto a machine shed and damaged a boat.

Hail, Ogle

When: April 5, 8:10 PM CST to 8:11 PM CST
Where: Ogle County, Forreston
Measured: 0.75 in hail
Reported by: Law Enforcement
Coordinates: 42.120, -89.580

Hail, Ogle

When: April 5, 8:10 PM CST to 8:11 PM CST
Where: Ogle County, Mt Morris
Measured: 1 in hail
Reported by: Law Enforcement
Coordinates: 42.050, -89.430

Thunderstorm Wind, Ogle

When: April 5, 8:15 PM CST
Where: Ogle County, Oregon
Measured: 60 kt (69 mph) estimated gust
Property damage: $5,000
Reported by: Law Enforcement
Coordinates: 42.020, -89.330

Trees, tree limbs and power lines were blown down. One tree fell onto a house.

Thunderstorm Wind, Lee

When: April 5, 8:15 PM CST
Where: Lee County, Franklin Grove
Measured: 52 kt (60 mph) measured gust
Reported by: Broadcast Media
Coordinates: 41.830, -89.300

A wind gust to 60 mph was measured in Franklin Grove.

Thunderstorm Wind, Lee

When: April 5, 8:15 PM CST
Where: Lee County, 2.52 mi N of Franklin Grove
Measured: 56 kt (64 mph) estimated gust
Property damage: $3,000
Reported by: Newspaper
Coordinates: 41.867, -89.303

Two utility poles and a power line were blown down near Daysville and Nalor Roads.

Thunderstorm Wind, Ogle

When: April 5, 8:28 PM CST
Where: Ogle County, 2.71 mi ESE of Rochelle
Measured: 50 kt (58 mph) estimated gust
Injuries: 1 direct, 0 indirect
Property damage: $50,000
Reported by: Law Enforcement
Coordinates: 41.905, -89.021

Two semi trucks were blown over along Interstate 39 and one on Interstate 88. One driver was taken to the hospital.

Hail, Cook

When: April 5, 8:30 PM CST to 8:31 PM CST
Where: Cook County, Hoffman Estates
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 42.050, -88.120

Lightning, Ogle

When: April 5, 8:30 PM CST
Where: Ogle County, Rochelle
Property damage: $30,000
Reported by: Newspaper
Coordinates: 41.920, -89.070

The Rochelle police department's antenna was struck by lightning. The lightning travelled down the antenna and damaged a police car and then damaged all three of their dispatch stations.

Hail, Winnebago

When: April 5, 8:35 PM CST to 8:36 PM CST
Where: Winnebago County, Rockford
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 42.270, -89.080

Penny size hail was reported on the south side of Rockford.

Thunderstorm Wind, Ogle

When: April 5, 8:35 PM CST
Where: Ogle County, 1.72 mi SSE of Creston
Measured: 65 kt (75 mph) estimated gust
Property damage: $50,000
Reported by: Trained Spotter
Coordinates: 41.906, -88.961

Barns were destroyed and a roof was taken off a cattle shelter near Woodlawn and Fairview.

Hail, Cook

When: April 5, 8:35 PM CST to 8:45 PM CST
Where: Cook County, Hoffman Estates
Measured: 1.25 in hail
Property damage: $50,000
Reported by: Trained Spotter
Coordinates: 42.050, -88.120

Hail ranging in size from a penny to a half dollar lasted for about 10 minutes causing minor damage to cars and trees.

Thunderstorm Wind, De Kalb

When: April 5, 8:40 PM CST
Where: De Kalb County, 1 mi SW of Malta
Measured: 65 kt (75 mph) estimated gust
Property damage: $25,000
Reported by: Trained Spotter
Coordinates: 41.920, -88.884

A barn was destroyed.

Thunderstorm Wind, De Kalb

When: April 5, 8:45 PM CST
Where: De Kalb County, 0.16 mi SW of Hart
Measured: 55 kt (63 mph) estimated gust
Property damage: $1,000
Reported by: Trained Spotter
Coordinates: 42.098, -88.702

Trees were blown down along Route 72 on the west side of Genoa. Powerlines were also blown down.

Thunderstorm Wind, De Kalb

When: April 5, 8:45 PM CST
Where: De Kalb County, 2.36 mi SSE of Sycamore
Measured: 55 kt (63 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.950, -88.657

Trees were blown down on Barber Greene Road east of Airport Road.

Hail, De Kalb

When: April 5, 8:50 PM CST to 8:51 PM CST
Where: De Kalb County, De Kalb
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 41.930, -88.750

Thunderstorm Wind, Kane

When: April 5, 9:01 PM CST
Where: Kane County, Maple Park
Measured: 61 kt (70 mph) measured gust
Reported by: Broadcast Media
Coordinates: 41.900, -88.600

A wind gust to 70 mph was measured in Maple Park.

Hail, Kane

When: April 5, 9:13 PM CST to 9:14 PM CST
Where: Kane County, 1.3 mi NNW of Coleman
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 41.996, -88.313

Quarter size hail was reported at Spring and Wedgewood.

Hail, Kane

When: April 5, 9:17 PM CST to 9:18 PM CST
Where: Kane County, 1.82 mi W of Dundee
Measured: 0.75 in hail
Reported by: Emergency Manager
Coordinates: 42.081, -88.335

Penny size hail was reported near Interstate 90 and Randall Road.

Hail, Kane

When: April 5, 9:20 PM CST to 9:21 PM CST
Where: Kane County, 2.32 mi SW of Dundee
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 42.054, -88.328

Nickel size hail was reported one mile east northeast of West Highland Acres.

Hail, Kane

When: April 5, 9:20 PM CST to 9:21 PM CST
Where: Kane County, Elgin
Measured: 1 in hail
Reported by: Emergency Manager
Coordinates: 42.030, -88.280

Thunderstorm Wind, Du Page

When: April 5, 9:25 PM CST
Where: Du Page County, West Chicago
Measured: 50 kt (58 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.880, -88.200

Tree limbs were blown down along with 75 feet of wooden fence.

Hail, McHenry

When: April 5, 9:27 PM CST to 9:28 PM CST
Where: McHenry County, 2.45 mi NE of Silver Lakes
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 42.275, -88.216

Quarter size hail was reported at Dartmouth Drive and Newport Drive.

Thunderstorm Wind, McHenry

When: April 5, 9:27 PM CST
Where: McHenry County, 3.45 mi ENE of Silver Lakes
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.276, -88.192

A gust to 60 mph was estimated in Island Lake.

Hail, Du Page

When: April 5, 9:28 PM CST to 9:29 PM CST
Where: Du Page County, 1.98 mi WSW of Hanover Park
Measured: 1.25 in hail
Reported by: Trained Spotter
Coordinates: 42.013, -88.217

Hail was reported near Route 20 and Naperville Road.

Hail, Cook

When: April 5, 9:30 PM CST to 9:31 PM CST
Where: Cook County, Streamwood
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 42.030, -88.170

Hail, Du Page

When: April 5, 9:30 PM CST
Where: Du Page County, Hanover Park
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 42.020, -88.180

Lightning, Cook

When: April 5, 9:30 PM CST
Where: Cook County, 1.23 mi ESE of Bartlett
Property damage: $5,000
Reported by: Newspaper
Coordinates: 41.996, -88.157

Power lines were blown down onto a house on Cedar Avenue which started a small fire. The fire damage to the house was minimal but the house sustained smoke damage throughout.

Hail, Cook

When: April 5, 9:32 PM CST to 9:34 PM CST
Where: Cook County, Streamwood
Measured: 1.5 in hail
Reported by: Trained Spotter
Coordinates: 42.030, -88.170

Hail, Cook

When: April 5, 9:35 PM CST to 9:36 PM CST
Where: Cook County, Des Plaines
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 42.030, -87.900

Hail, Cook

When: April 5, 9:35 PM CST to 9:36 PM CST
Where: Cook County, Rolling Meadows
Measured: 1 in hail
Reported by: Public
Coordinates: 42.080, -88.000

Hail, Du Page

When: April 5, 9:36 PM CST to 9:37 PM CST
Where: Du Page County, Itasca
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 41.970, -88.020

Hail, Cook

When: April 5, 9:37 PM CST to 9:39 PM CST
Where: Cook County, Rosemont
Measured: 1.5 in hail
Property damage: $868,000
Reported by: Newspaper
Coordinates: 41.980, -87.870

The roof of the All State Arena was damaged by hail and had to be replaced.

Hail, Cook

When: April 5, 9:38 PM CST to 9:39 PM CST
Where: Cook County, Arlington Hgts
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 42.080, -88.000

Thunderstorm Wind, Du Page

When: April 5, 9:40 PM CST
Where: Du Page County, Bensenville
Measured: 56 kt (64 mph) estimated gust
Property damage: $50,000
Reported by: Trained Spotter
Coordinates: 41.950, -87.930

Trees and tree limbs were blown down. Four houses suffered roof damage.

Thunderstorm Wind, Du Page

When: April 5, 9:40 PM CST
Where: Du Page County, 0.15 mi E of Bensenville
Measured: 61 kt (70 mph) estimated gust
Property damage: $25,000
Reported by: Newspaper
Coordinates: 41.950, -87.927

Most of the roof of an auto shop on Green Street was blown off.

Hail, Cook

When: April 5, 9:41 PM CST to 9:42 PM CST
Where: Cook County, Streamwood
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 42.030, -88.170

Thunderstorm Wind, Du Page

When: April 5, 9:41 PM CST
Where: Du Page County, 0.55 mi ESE of Bensenville
Measured: 61 kt (70 mph) estimated gust
Property damage: $50,000
Reported by: Newspaper
Coordinates: 41.946, -87.921

The roof on two industrial buildings was blown off near County Line Road and Third Avenue. A brick wall of one of the buildings also collapsed.

Thunderstorm Wind, Cook

When: April 5, 9:47 PM CST
Where: Cook County, (Ord)o'Hare Intl Arp
Measured: 59 kt (68 mph) measured gust
Reported by: ASOS
Coordinates: 41.980, -87.900

Hail, Cook

When: April 5, 9:48 PM CST to 9:49 PM CST
Where: Cook County, Schaumburg
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 42.030, -88.080

Hail, Cook

When: April 5, 9:49 PM CST to 9:50 PM CST
Where: Cook County, Morton Grove
Measured: 1 in hail
Reported by: Emergency Manager
Coordinates: 42.030, -87.770

Hail, Cook

When: April 5, 9:50 PM CST to 9:51 PM CST
Where: Cook County, Evanston
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 42.050, -87.680

Hail, Cook

When: April 5, 9:50 PM CST to 9:52 PM CST
Where: Cook County, Park Ridge
Measured: 1.25 in hail
Reported by: Trained Spotter
Coordinates: 42.030, -87.870

Hail, Cook

When: April 5, 9:50 PM CST to 9:53 PM CST
Where: Cook County, Niles
Measured: 1.75 in hail
Reported by: Public
Coordinates: 42.030, -87.800

Hail, Cook

When: April 5, 9:52 PM CST to 9:56 PM CST
Where: Cook County, 0.39 mi E of Cumberland
Measured: 2.75 in hail
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 42.050, -87.912

Baseball size hail was reported near Wolf and Golf Roads. The hail broke numerous windows.

Hail, Cook

When: April 5, 9:53 PM CST to 9:54 PM CST
Where: Cook County, 1.89 mi N of Forest Glen
Measured: 0.75 in hail
Reported by: Amateur Radio
Coordinates: 41.997, -87.807

Penny size hail was reported near Harlem Avenue and Northwest Highway.

Hail, Cook

When: April 5, 9:54 PM CST to 9:55 PM CST
Where: Cook County, Niles
Measured: 1 in hail
Reported by: Amateur Radio
Coordinates: 42.030, -87.800

Hail, Cook

When: April 5, 9:55 PM CST to 9:56 PM CST
Where: Cook County, Niles
Measured: 1 in hail
Reported by: Amateur Radio
Coordinates: 42.030, -87.800

Hail, Cook

When: April 5, 9:55 PM CST to 9:56 PM CST
Where: Cook County, Skokie
Measured: 1.5 in hail
Reported by: Trained Spotter
Coordinates: 42.030, -87.720

Hail, Cook

When: April 5, 9:55 PM CST to 9:56 PM CST
Where: Cook County, 1 mi N of Evanston
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 42.065, -87.680

Hail, Cook

When: April 5, 9:57 PM CST to 10:02 PM CST
Where: Cook County, Evanston
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 42.050, -87.680

Hail, Ogle

When: April 5, 10:28 PM CST to 10:29 PM CST
Where: Ogle County, 1 mi S of Mt Morris
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 42.035, -89.430

Thunderstorm Wind, Winnebago

When: April 5, 11:30 PM CST
Where: Winnebago County, 1 mi E of Rockford
Measured: 55 kt (63 mph) estimated gust
Reported by: Law Enforcement
Coordinates: 42.270, -89.060

Trees were blown down on the east side of Rockford.

Thunderstorm Wind, Winnebago

When: April 5, 11:35 PM CST
Where: Winnebago County, 2 mi NE of Rockford
Measured: 55 kt (63 mph) estimated gust
Reported by: Broadcast Media
Coordinates: 42.291, -89.052

Trees were reported to be snapped off on the northeast side of Rockford.

Hail, Ogle

When: April 5, 11:35 PM CST to 11:36 PM CST
Where: Ogle County, Oregon
Measured: 0.75 in hail
Reported by: Law Enforcement
Coordinates: 42.020, -89.330

Thunderstorm Wind, McHenry

When: April 5, 11:59 PM CST
Where: McHenry County, Marengo
Measured: 61 kt (70 mph) estimated gust
Reported by: Law Enforcement
Coordinates: 42.250, -88.600

Numerous trees and tree limbs were blown down. Structural damage was reported to one building.

Thunderstorm Wind, McHenry

When: April 6, 12:00 AM CST
Where: McHenry County, 4 mi N of Marengo
Measured: 61 kt (70 mph) estimated gust
Property damage: $25,000
Reported by: Emergency Manager
Coordinates: 42.308, -88.600

A barn was blown down.

Thunderstorm Wind, McHenry

When: April 6, 12:10 AM CST
Where: McHenry County, 0.92 mi N of Huntley
Measured: 55 kt (63 mph) estimated gust
Reported by: Amateur Radio
Coordinates: 42.183, -88.423

A large tree was blown down near Reed Road and Route 47.

Thunderstorm Wind, McHenry

When: April 6, 12:10 AM CST
Where: McHenry County, Huntley
Measured: 51 kt (59 mph) measured gust
Property damage: $5,000
Reported by: Amateur Radio
Coordinates: 42.170, -88.420

A gust to 59 mph was measured in Huntley. Tree limbs, utility poles and power lines were blown down.

Thunderstorm Wind, McHenry

When: April 6, 12:10 AM CST
Where: McHenry County, 0.4 mi NW of Huntley
Measured: 61 kt (70 mph) estimated gust
Reported by: Newspaper
Coordinates: 42.174, -88.425

A large tree was uprooted along Church Street.

Thunderstorm Wind, McHenry

When: April 6, 12:15 AM CST
Where: McHenry County, Crystal Lake
Measured: 61 kt (70 mph) estimated gust
Property damage: $10,000
Reported by: Law Enforcement
Coordinates: 42.230, -88.330

Numerous trees, tree limbs, utility poles and power lines were blown down in many areas of Crystal Lake.

Hail, McHenry

When: April 6, 12:15 AM CST to 12:16 AM CST
Where: McHenry County, Crystal Lake
Measured: 1 in hail
Reported by: Public
Coordinates: 42.230, -88.330

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Lightning: A lightning strike that killed, injured or caused damage.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Illinois in 2010 Every state in 2010 This day in weather history Warnings in Illinois, April 2010

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 227713, 224151, 227777, 227781, 224153, 224157, 224160, 227679, 227718, 224163, 224221, 227706, 224164, 227617, 227642, 227618, 224165, 224167, 224196, 227678, 224201, 224202, 224204, 224205, 224207, 224211, 224215, 227619, 224219, 224224, 227698, 224226, 227628, 227635, 224227, 254493, 224228, 227636, 227755, 224230, and more.