August 13, 2011 Hail Event

A vigorous upper-level disturbance tracked across central Illinois during the afternoon of August 13th...triggering scattered strong to severe thunderstorms.  Cold air aloft associated with this feature created a moderately unstable environment characterized by Convective Available Potential Energy (CAPE) values of 1500 to 2500 J/kg.  In addition, a weather balloon launched by National Weather Service Lincoln at 6 PM indicated a relatively low freezing level of around 12,500ft, as well as, steep low-level lapse rates.  These conditions allowed thunderstorms that formed across the area to develop strong updrafts capable of supporting large hail.

Numerous reports of hail were received between 2 PM and 6 PM...mainly along and north of a Jacksonville to Danville line.  The largest hail fell across southern Logan County at around 4:30 PM, when a weather observer from Mt. Pulaski noted tennis ball-sized stones (2.5" diameter) at his location!  Several cars suffered damage due to the hail.  Other large hail was noted across portions of Morgan County, where golf ball-sized stones (1.75" diameter) created significant crop damage near the town of Pisgah and across southern Peoria County, where ping pong ball-sized hail (1.5" diameter) caused car and shingle damage just north of Mapleton.

Here is a complete listing of the hail reports received from this event:

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LINCOLN IL
722 PM CDT SAT AUG 13 2011

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

0205 PM     HAIL             2 S BARTONVILLE         40.61N 89.66W
08/13/2011  M1.00 INCH       PEORIA             IL   EMERGENCY MNGR

0249 PM     HAIL             PEKIN                   40.57N 89.63W
08/13/2011  M1.00 INCH       TAZEWELL           IL   EMERGENCY MNGR

0251 PM     HAIL             PEKIN                   40.57N 89.63W
08/13/2011  M0.75 INCH       TAZEWELL           IL   EMERGENCY MNGR

0300 PM     HAIL             PEKIN                   40.57N 89.63W
08/13/2011  M1.00 INCH       TAZEWELL           IL   TRAINED SPOTTER

0301 PM     HAIL             4 SE PEKIN              40.53N 89.57W
08/13/2011  M0.88 INCH       TAZEWELL           IL   EMERGENCY MNGR

            REPORTED BY EM...HALFWAY BETWEEN PEKIN AND TREMONT.

0306 PM     HAIL             2 SW PEKIN              40.55N 89.65W
08/13/2011  M0.75 INCH       TAZEWELL           IL   EMERGENCY MNGR

            DIME SIZE SIZE AT POWERTON POWERSTATION.

0309 PM     HAIL             1 N MAPLETON            40.58N 89.72W
08/13/2011  M1.50 INCH       PEORIA             IL   TRAINED SPOTTER

            HAIL LASTED ABOUT 2-3 MINUTES...4 CARS DAMAGED AND
            SEVERAL HOUSES WITH SHINGLE DAMAGE FROM HAIL.

0313 PM     HAIL             5 SE MORTON             40.56N 89.40W
08/13/2011  M0.75 INCH       TAZEWELL           IL   EMERGENCY MNGR

0316 PM     HAIL             3 S MORTON              40.57N 89.47W
08/13/2011  M0.75 INCH       TAZEWELL           IL   EMERGENCY MNGR

            DIME SIZE HAIL AT INTERSTATE 155 AND BIRCHWOOD.

0320 PM     HAIL             PEKIN                   40.57N 89.63W
08/13/2011  M1.00 INCH       TAZEWELL           IL   EMERGENCY MNGR

0337 PM     HAIL             3 SE MORTON             40.58N 89.43W
08/13/2011  M0.75 INCH       TAZEWELL           IL   TRAINED SPOTTER

            HAIL LASTED FOR 2 MINUTES.

0342 PM     HAIL             5 SE MORTON             40.56N 89.40W
08/13/2011  M1.00 INCH       TAZEWELL           IL   EMERGENCY MNGR

            QUARTER SIZE HAIL AT THE CORNER OF ALLENTOWN ROAD AND
            HERBERGER

0343 PM     HAIL             2 S PHILADELPHIA        39.89N 90.12W
08/13/2011  M1.00 INCH       CASS               IL   MESONET

            SWOP REPORT

0350 PM     HAIL             1 NW JACKSONVILLE       39.74N 90.25W
08/13/2011  M1.25 INCH       MORGAN             IL   COCORAHS

            PEA SIZE TO HALF DOLLAR SIZED HAIL.

0353 PM     HAIL             ARMINGTON               40.34N 89.31W
08/13/2011  M0.75 INCH       TAZEWELL           IL   EMERGENCY MNGR

            HAIL AT CORNER OF MONROE STREET AND ARMINGTON ROAD.

0355 PM     HAIL             6 NW FRANKLIN           39.68N 90.13W
08/13/2011  E1.75 INCH       MORGAN             IL   MESONET

            SIGNIFICANT CROP DAMAGE TO A BEAN FIELD NEAR THE TOWN OF
            PISGAH.

0408 PM     HAIL             2 E BLOOMINGTON         40.48N 88.94W
08/13/2011  M0.75 INCH       MCLEAN             IL   NWS EMPLOYEE

            PENNY SIZED HAIL WITH ESTIMATED 40 MPH WIND GUST.

0408 PM     HAIL             2 W SPRINGFIELD         39.78N 89.68W
08/13/2011  M0.88 INCH       SANGAMON           IL   TRAINED SPOTTER

            PENNY TO NICKEL SIZED HAIL ON THE WEST SIDE OF
            SPRINGFIELD.

0425 PM     HAIL             1 SW LOAMI              39.66N 89.86W
08/13/2011  M0.88 INCH       SANGAMON           IL   EMERGENCY MNGR

0430 PM     HAIL             CLINTON                 40.15N 88.96W
08/13/2011  M0.75 INCH       DE WITT            IL   EMERGENCY MNGR

0434 PM     HAIL             MOUNT PULASKI           40.01N 89.28W
08/13/2011  M1.25 INCH       LOGAN              IL   CO-OP OBSERVER

0437 PM     HAIL             MOUNT PULASKI           40.01N 89.28W
08/13/2011  E2.00 INCH       LOGAN              IL   CO-OP OBSERVER

0438 PM     HAIL             MOUNT PULASKI           40.01N 89.28W
08/13/2011  M2.50 INCH       LOGAN              IL   CO-OP OBSERVER

            SEVERAL CARS DAMAGED IN TOWN...AND BEAN FIELDS SOUTHWEST
            OF TOWN ALSO DAMAGED.

0442 PM     HAIL             ELKHART                 40.02N 89.48W
08/13/2011  M1.50 INCH       LOGAN              IL   EMERGENCY MNGR

0445 PM     HAIL             3 SE AUBURN             39.55N 89.71W
08/13/2011  M1.25 INCH       SANGAMON           IL   EMERGENCY MNGR

0450 PM     HAIL             DIVERNON                39.57N 89.65W
08/13/2011  M0.75 INCH       SANGAMON           IL   LAW ENFORCEMENT

0502 PM     HAIL             LATHAM                  39.97N 89.16W
08/13/2011  M1.50 INCH       LOGAN              IL   EMERGENCY MNGR

0530 PM     HAIL             1 N CHATHAM             39.69N 89.70W
08/13/2011  M0.75 INCH       SANGAMON           IL   COCORAHS
   


Hail Diameter Size Description
1/4"
Pea
1/2"
Plain M&M
3/4"
Penny
7/8"
Nickel
1" (severe)
Quarter
1 1/4"
Half Dollar
1 1/2"
Walnut/Ping Pong Ball
1 3/4"
Golf Ball
2"
Hen Egg/Lime
2 1/2"
Tennis Ball
2 3/4"
Baseball
3"
Teacup/Large Apple
4"
Grapefruit
4 1/2"
Softball
4 3/4"- 5"
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