NWS
St. Louis, Missouri

April 21st - 22nd, 2005 Severe Weather Event
Large Hail and Damaging Winds
Across Central and Eastern Missouri into Western Illinois

Radar and Damage Analysis:
     
Radar Reflectivity
from WSR-88D KLSX
(image loop)
Hail photos from Bonnots Mill in Northern Osage County, MO
(Courtesy of Justin Carwile)
     
 
Damage Survey Assessment:
The days leading up to this severe weather event had been unseasonably warm. The southerly winds responsible for these warm temperatures also advected increasingly moist and unstable air into the Central U.S. over the preceding 2 days.

A cold front that pushed across the area on Wednesday became stationary over Southern Missouri and Southern Illinois Thursday morning. Low pressure then formed over the Plains and began moving east, causing the front to move north as a warm front. The wind shear produced by this pattern, as well as the unstable air that had worked into the area earlier in the week, produced the severe weather.

During the late afternoon and early evening hours, individual thunderstorms were responsible for the severe weather threat. One of these storms produced up to baseball sized hail, and possibly a brief tornado touchdown, over parts of Mid-Missouri.

Later in the evening, the storms evolved into a solid line that moved across the eastern half of Missouri and southern sections of Illinois. One part of this line produced winds of 40 to 50 mph along Interstate 70 between Columbia and St. Charles. This part of the line accelerated rapidly, and this bowing segment can clearly been seen in the radar data.
 
Preliminary Storm Reports for April 21st:
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE ST LOUIS MO
236 AM CDT FRI APR 22 2005

TIME (DATE)

0300 PM (04/21/2005)

0330 PM (04/21/2005)

0400 PM (04/21/2005)

0410 PM (04/21/2005)

0430 PM (04/21/2005)

0430 PM (04/21/2005)

0435 PM (04/21/2005)

0505 PM (04/21/2005)

0505 PM (04/21/2005)

0510 PM (04/21/2005)

0510 PM (04/21/2005)

0510 PM (04/21/2005)

0510 PM (04/21/2005)

0512 PM (04/21/2005)


0520 PM (04/21/2005)

0525 PM (04/21/2005)

0525 PM (04/21/2005)

0530 PM (04/21/2005)

0540 PM (04/21/2005)

0545 PM (04/21/2005)

0601 PM (04/21/2005)

0605 PM (04/21/2005)

0605 PM (04/21/2005)

0605 PM (04/21/2005)

0605 PM (04/21/2005)

0625 PM (04/21/2005)

0625 PM (04/21/2005)


0715 PM (04/21/2005)

0720 PM (04/21/2005)


0720 PM (04/21/2005)

0720 PM (04/21/2005)


0725 PM (04/21/2005)

0730 PM (04/21/2005)

0755 PM (04/21/2005)

0800 PM (04/21/2005)

0805 PM (04/21/2005)

0805 PM (04/21/2005)


0815 PM (04/21/2005)

0815 PM (04/21/2005)

0817 PM (04/21/2005)

0820 PM (04/21/2005)

0835 PM (04/21/2005)

0835 PM (04/21/2005)

0850 PM (04/21/2005)

0900 PM (04/21/2005)

0905 PM (04/21/2005)

0910 PM (04/21/2005)

0940 PM (04/21/2005)

1015 PM (04/21/2005)


1015 PM (04/21/2005)


1020 PM (04/21/2005)


1020 PM (04/21/2005)

1035 PM (04/21/2005)

1035 PM (04/21/2005)

1045 PM (04/21/2005)

1045 PM (04/21/2005)

1052 PM (04/21/2005)

1105 PM (04/21/2005)
LOCATION (COUNTY)

OLD MINES (WASHINGTON MO)

CALIFORNIA (MONITEAU MO)

JAMESTOWN (MONITEAU MO)

JAMESTOWN (MONITEAU MO)

BOURBON (CRAWFORD MO)

3 S ASHLAND (BOONE MO)

3 S ASHLAND (BOONE MO)

2 NE WAINWRIGHT (CALLAWAY MO)

2 NW WAINWRIGHT (CALLAWAY MO)

LAKE MYKEE (CALLAWAY MO)

TEBBETTS (CALLAWAY MO)

LOOSE CREEK (OSAGE MO)

5 S BONNOTS MILL (OSAGE MO)

TEBBETTS (CALLAWAY MO)


OWENSVILLE (GASCONADE MO)

OWENSVILLE (GASCONADE MO)

CHAMOIS (OSAGE MO)

GERALD (FRANKLIN MO)

CUBA (CRAWFORD MO)

CUBA (CRAWFORD MO)

LINN (OSAGE MO)

POTOSI (WASHINGTON MO)

RICHWOODS (WASHINGTON MO)

POTOSI (WASHINGTON MO)

LINN (OSAGE MO)

POTOSI (WASHINGTON MO)

POTOSI (WASHINGTON MO)


2 NE HIGH RIDGE (JEFFERSON MO)

ST. LOUIS (ST. LOUIS CITY MO)


FENTON (ST. LOUIS MO)

POTOSI (WASHINGTON MO)


OAKVILLE (ST. LOUIS MO)

OAKVILLE (ST. LOUIS MO)

WESTPHALIA (OSAGE MO)

COLUMBIA (BOONE MO)

WESTPHALIA (OSAGE MO)

POTOSI (WASHINGTON MO)


BRAZITO (COLE MO)

POTOSI (WASHINGTON MO)

BRAZITO (COLE MO)

BRAZITO (COLE MO)

5 SW CARLINVILLE (MACOUPIN IL)

5 W CARLINVILLE (MACOUPIN IL)

CARLINVILLE (MACOUPIN IL)

3 N ASHLAND (BOONE MO)

POTOSI (WASHINGTON MO)

10 NW FULTON (CALLAWAY MO)

FULTON (CALLAWAY MO)

FULTON (CALLAWAY MO)


COLUMBIA (BOONE MO)


COLUMBIA (BOONE MO)


3 N HOLTS (CALLAWAY MO)

ST. MARTINS (COLE MO)

3 W JEFFERSON CITY (COLE MO)

JEFFERSON CITY (COLE MO)

1 E JEFFERSON CITY (COLE MO)

NEW BLOOMFIELD (CALLAWAY MO)

NEW FLORENCE (MONTGOMERY MO)
EVENT

0.88 INCH HAIL

0.88 INCH HAIL

1.25 INCH HAIL

1.00 INCH HAIL

0.88 INCH HAIL

0.88 INCH HAIL

1.75 INCH HAIL

2.00 INCH HAIL

2.50 INCH HAIL

1.75 INCH HAIL

0.88 INCH HAIL

0.88 INCH HAIL

0.75 INCH HAIL

1.75 INCH HAIL


1.00 INCH HAIL

0.75 INCH HAIL

0.75 INCH HAIL

0.75 INCH HAIL

0.88 INCH HAIL

0.75 INCH HAIL

1.75 INCH HAIL

0.75 INCH HAIL

0.88 INCH HAIL

0.75 INCH HAIL

1.00 INCH HAIL

0.75 INCH HAIL

FLASH FLOOD


0.88 INCH HAIL

1.75 INCH HAIL


0.88 INCH HAIL

FLASH FLOOD


0.75 INCH HAIL

0.75 INCH HAIL

1.00 INCH HAIL

0.75 INCH HAIL

0.88 INCH HAIL

FLASH FLOOD


1.00 INCH HAIL

1.00 INCH HAIL

1.75 INCH HAIL

1.75 INCH HAIL

1.75 INCH HAIL

1.00 INCH HAIL

0.88 INCH HAIL

0.75 INCH HAIL

0.88 INCH HAIL

1.25 INCH HAIL

1.00 INCH HAIL

TSTM WND DMG


TSTM WND DMG


TSTM WND DMG


1.00 INCH HAIL

1.00 INCH HAIL

1.00 INCH HAIL

0.75 INCH HAIL

0.88 INCH HAIL

TSTM WND DMG

0.75 INCH HAIL
REMARKS

HAIL LASTED FOR 5 MINUTES.

REPORTED BY LAW ENFORCEMENT

REPORTED BY STORM CHASER

REPORTED BY LAW ENFORCEMENT

REPORTED BY LAW ENFORCEMENT

REPORTED BY EMERGENCY MNGR

REPORTED BY EMERGENCY MNGR

ON HIGHWAY 94

REAR WINDOWS ON VEHICLE BROKEN OUT.

REPORTED BY STORM CHASER

NICKEL SIZE HAIL AND GETTING LARGER.

REPORTED BY STORM CHASER

REPORTED BY PUBLIC

NUMEROUS VEHICLES WERE DAMAGED ALONG HWY 94...WITH SEVERAL SMALL TREE LIMBS DOWN AS WELL.

REPORTED BY STORM CHASER

REPORTED BY TRAINED SPOTTER

AT HWY 100 AND HWY C.

REPORTED BY LAW ENFORCEMENT

REPORTED BY LAW ENFORCEMENT

REPORTED BY LAW ENFORCEMENT

REPORTED BY TRAINED SPOTTER

REPORTED BY LAW ENFORCEMENT

HAIL FELL FOR 10 MINUTES FROM 605 PM TO 615 PM.

REPORTED BY LAW ENFORCEMENT

REPORTED BY LAW ENFORCEMENT

REPORTED BY TRAINED SPOTTER

SOME FLOODING WAS REPORTED ON HWY F FROM POTOSI TO 10 MILES NORTH OF POTOSI.

REPORTED BY PUBLIC

ST. LOUIS CITY POLICE REPORTED HAIL AT JENNINGS AND NATURAL BRIDGE ROAD.

REPORTED BY PUBLIC

TROOP C REPORTED THAT SEVERAL ROADS IN TOWN WERE CLOSED DUE TO FLOODING.

AT I-270 AND TELEGRAPH ROAD.

HAIL FELL FOR 10 MINUTES FROM 730 PM TO 740 PM.

REPORTED BY LAW ENFORCEMENT

AT HWY 63 AND HINTON.

REPORTED BY EMERGENCY MNGR

NUMEROUS ROADS FLOODED. BRITTON CREEK WHICH FLOWS THROUGH POTOSI IS OUT OF ITS BANKS.

REPORTED BY LAW ENFORCEMENT

REPORTED BY TRAINED SPOTTER

REPORTED BY FIRE DEPT/RESCUE

REPORTED BY EMERGENCY MNGR

REPORTED BY EMERGENCY MNGR

REPORTED BY EMERGENCY MNGR

REPORTED BY EMERGENCY MNGR

REPORTED BY FEDERAL EMPLOYEE

REPORTED BY LAW ENFORCEMENT

THE HAIL WAS REPORTED IN MILLERSBURG.

HAIL STARTED 30 MINUTES AGO AS DIME SIZE HAIL.

POWER LINES REPORTED DOWN BY CALLAWAY COUNTY SHERIFF DEPARTMENT.

2-5 INCH DIAMETER TREE LIMBS DOWNED BY HIGH WINDS. POWER OUTAGES AT MIZZOU.

POWER LINES DOWN IN COLUMBIA. WIND GUST MEASURED BY KMIZ IN COLUMBIA AT 50MPH.

REPORTED BY TRAINED SPOTTER

REPORTED BY LAW ENFORCEMENT

REPORTED BY TRAINED SPOTTER

REPORTED BY LAW ENFORCEMENT

REPORTED BY TRAINED SPOTTER

POWER LINES DOWN IN NEW BLOOMFIELD

REPORTED BY LAW ENFORCEMENT

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