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A weakly defined warm front moved slowly north through Oklahoma. South of the front dew point temperatures were in the middle 60s, with afternoon temperatures well into the 70s. Lift associated with an upper-level disturbance combined with around 2500 J/kg of CAPE created favorable atmospheric conditions for severe thunderstorm development. A large supercell thunderstorm developed over Major County, and quickly became severe. Baseball-size hail was reported west of Fairview. Hail up to softball-size was reported west of Okeene as the supercell continued moving southeast. A larger area of at least golfball-size hail developed from south of Kingfisher to northwest Oklahoma City, with embedded areas of larger than baseball size. Wind speeds also averaged around 50 mph, but some locations measured winds in excess of 60 mph. Reports of damage to cars and automobiles, as well as to trees and vegetation came in by the hundreds as the supercell moved through the heart of the Oklahoma City metro area. Hail drifts reached several feet deep over some areas. Some areas even reported hail still on the ground more than 12 hours later. The reported hail sizes became smaller as the storm moved into Seminole, Hughes, and Atoka counties. Although there has been no monetary value placed on the hail storm, estimations have put the damages well into the millions.

Hail Reports for the May 16, 2010 Hail Storm in Central Oklahoma
May 16, 2010 Hail Reports in Central Oklahoma

NSSL Hail Swath Graphic for the May 16, 2010 Hail Storm in Central Oklahoma
NSSL Hail Swath Graphic for the May 16, 2010 Hail Storm in Central Oklahoma

Here is a photo of golfball size hail near the intersection of 164th Street and Meridian Avenue in Oklahoma City on May 16, 2010.
Photo of golfball size hail near the intersection of 164th Street and Meridian Avenue in Oklahoma City.

RELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE NORMAN OK
1244 PM CDT MON MAY 17 2010

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

0122 PM     HAIL             8 WSW FAIRVIEW          36.22N 98.61W
05/16/2010  E2.75 INCH       MAJOR              OK   PUBLIC

            PUBLIC REPORT RELAYED BY KWTV.

0158 PM     HAIL             2 WSW OKEENE            36.11N 98.35W
05/16/2010  E4.25 INCH       BLAINE             OK   LAW ENFORCEMENT

            RELAYED THROUGH KWTV

0202 PM     HAIL             OKEENE                  36.12N 98.32W
05/16/2010  E2.75 INCH       BLAINE             OK   FIRE DEPT/RESCUE

0238 PM     HAIL             5 SSW LOYAL             35.91N 98.15W
05/16/2010  E1.25 INCH       KINGFISHER         OK   PUBLIC

0332 PM     HAIL             PIEDMONT                35.64N 97.75W
05/16/2010  E2.00 INCH       CANADIAN           OK   EMERGENCY MNGR

0333 PM     HAIL             PIEDMONT                35.64N 97.75W
05/16/2010  E2.75 INCH       CANADIAN           OK   PUBLIC

            RELAYED THROUGH NWS EMPLOYEE

0339 PM     HAIL             5 E PIEDMONT            35.64N 97.66W
05/16/2010  E1.00 INCH       OKLAHOMA           OK   TRAINED SPOTTER

0345 PM     HAIL             4 NNW WARR ACRES        35.58N 97.65W
05/16/2010  E1.75 INCH       OKLAHOMA           OK   PUBLIC

            RELAYED BY NWS EMPLOYEE

0348 PM     HAIL             W EDMOND                35.65N 97.48W
05/16/2010  E1.25 INCH       OKLAHOMA           OK   AMATEUR RADIO

            HAIL REPORTED ON EDMOND RD BETWEEN MAY AND PORTLAND

0350 PM     HAIL             6 E PIEDMONT            35.64N 97.64W
05/16/2010  E2.50 INCH       OKLAHOMA           OK   PUBLIC

0350 PM     HAIL             5 NNW THE VILLAGE       35.64N 97.60W
05/16/2010  E1.75 INCH       OKLAHOMA           OK   NWS EMPLOYEE

0351 PM     HAIL             5 NNW WARR ACRES        35.59N 97.66W
05/16/2010  M2.00 INCH       OKLAHOMA           OK   AMATEUR RADIO

0353 PM     HAIL             3 WSW EDMOND            35.64N 97.53W
05/16/2010  E1.00 INCH       OKLAHOMA           OK   AMATEUR RADIO

0358 PM     HAIL             5 NW OKLAHOMA CITY      35.53N 97.57W
05/16/2010  E4.25 INCH       OKLAHOMA           OK   AMATEUR RADIO

0400 PM     HAIL             2 WSW NICHOLS HILLS     35.54N 97.58W
05/16/2010  M2.00 INCH       OKLAHOMA           OK   AMATEUR RADIO

0400 PM     HAIL             2 WSW NICHOLS HILLS     35.54N 97.58W
05/16/2010  E1.75 INCH       OKLAHOMA           OK   AMATEUR RADIO

            6 CARS HAD DAMAGE ON NW 63RD AND PORTLAND AVE.

0405 PM     TSTM WND GST     6 N OKLAHOMA CITY       35.55N 97.51W
05/16/2010  M60.00 MPH       OKLAHOMA           OK   MESONET

0406 PM     HAIL             5 NNE OKLAHOMA CITY     35.54N 97.48W
05/16/2010  E1.00 INCH       OKLAHOMA           OK   AMATEUR RADIO

0406 PM     HAIL             2 ENE NICHOLS HILLS     35.56N 97.51W
05/16/2010  E1.75 INCH       OKLAHOMA           OK   AMATEUR RADIO

0407 PM     HAIL             2 NNW OKLAHOMA CITY     35.50N 97.53W
05/16/2010  M1.75 INCH       OKLAHOMA           OK   AMATEUR RADIO

0408 PM     HAIL             1 NE NICHOLS HILLS      35.56N 97.53W
05/16/2010  U0.25 INCH       OKLAHOMA           OK   PUBLIC

            BROKEN WINDOWS FROM VERY LARGE HAIL. TIME ESTIMATED.

0410 PM     HAIL             4 SSW EDMOND            35.60N 97.50W
05/16/2010  E1.75 INCH       OKLAHOMA           OK   STORM CHASER

0410 PM     HAIL             4 SSW EDMOND            35.60N 97.51W
05/16/2010  E1.25 INCH       OKLAHOMA           OK   AMATEUR RADIO

            HAIL COVERING THE GROUND

0411 PM     HAIL             THE VILLAGE             35.57N 97.56W
05/16/2010  E2.00 INCH       OKLAHOMA           OK   TRAINED SPOTTER

0412 PM     TSTM WND DMG     ENE THE VILLAGE         35.57N 97.56W
05/16/2010                   OKLAHOMA           OK   TRAINED SPOTTER

            MULTIPLE TREES DOWN AND POWER OUTAGES NEAR PENN AND
            BRITTON RD.

0413 PM     HAIL             2 NE OKLAHOMA CITY      35.49N 97.49W
05/16/2010  E1.75 INCH       OKLAHOMA           OK   PUBLIC

0418 PM     HAIL             3 WNW OKLAHOMA CITY     35.49N 97.56W
05/16/2010  E1.75 INCH       OKLAHOMA           OK   TRAINED SPOTTER

0418 PM     HAIL             5 NNE OKLAHOMA CITY     35.53N 97.47W
05/16/2010  U0.25 INCH       OKLAHOMA           OK   AMATEUR RADIO

            VERY LARGE HAIL BUSTED OUT STREET LIGHTS NEAR REMINGTON
            PARK. ALSO MINOR STREET FLOODING ON MARTIN LUTHER KING
            BLVD.

0424 PM     HAIL             4 ESE OKLAHOMA CITY     35.45N 97.44W
05/16/2010  E1.00 INCH       OKLAHOMA           OK   AMATEUR RADIO

            MINOR STREET FLOODING

0425 PM     HAIL             2 ESE OKLAHOMA CITY     35.45N 97.48W
05/16/2010  E1.75 INCH       OKLAHOMA           OK   AMATEUR RADIO

0425 PM     HAIL             2 SE FOREST PARK        35.49N 97.42W
05/16/2010  E1.25 INCH       OKLAHOMA           OK   TRAINED SPOTTER

0428 PM     HAIL             TINKER AIR FORCE BASE   35.42N 97.39W
05/16/2010  E2.50 INCH       OKLAHOMA           OK   OTHER FEDERAL

0429 PM     HAIL             S MIDWEST CITY          35.46N 97.37W
05/16/2010  E1.00 INCH       OKLAHOMA           OK   AMATEUR RADIO

0430 PM     HAIL             3 S CHOCTAW             35.44N 97.27W
05/16/2010  E2.00 INCH       OKLAHOMA           OK   PUBLIC

            HAIL COVERED THE GROUND

0430 PM     TSTM WND GST     TINKER AIR FORCE BASE   35.42N 97.39W
05/16/2010  M58.00 MPH       OKLAHOMA           OK   ASOS

0439 PM     HAIL             7 S NICOMA PARK         35.39N 97.32W
05/16/2010  E1.75 INCH       OKLAHOMA           OK   TRAINED SPOTTER

0450 PM     HAIL             STELLA                  35.32N 97.22W
05/16/2010  E1.75 INCH       CLEVELAND          OK   CO-OP OBSERVER

            CRACKED WINDSHIELDS IN STELLA

0510 PM     HAIL             SHAWNEE                 35.34N 96.92W
05/16/2010  E1.00 INCH       POTTAWATOMIE       OK   COUNTY OFFICIAL

0613 PM     HAIL             ALLEN                   34.88N 96.41W
05/16/2010  E1.75 INCH       PONTOTOC           OK   PUBLIC

0618 PM     HAIL             ALLEN                   34.88N 96.41W
05/16/2010  E2.00 INCH       PONTOTOC           OK   EMERGENCY MNGR

0627 PM     HAIL             3 SE CUSTER CITY        35.63N 98.85W
05/16/2010  E1.00 INCH       CUSTER             OK   PUBLIC

0649 PM     HAIL             10 NNE COALGATE         34.67N 96.15W
05/16/2010  E1.00 INCH       COAL               OK   PUBLIC

0724 PM     HAIL             4 WSW DAISY             34.51N 95.80W
05/16/2010  E1.75 INCH       ATOKA              OK   PUBLIC

0850 PM     HAIL             10 NNW GOODLETT         34.47N 99.95W
05/16/2010  E1.75 INCH       HARDEMAN           TX   AMATEUR RADIO

0940 PM     HAIL             4 SE QUANAH             34.25N 99.69W
05/16/2010  E1.75 INCH       HARDEMAN           TX   AMATEUR RADIO

            REPORTED AT LAKE PAULINE

0941 PM     HAIL             1 ESE QUANAH            34.29N 99.73W
05/16/2010  E1.75 INCH       HARDEMAN           TX   AMATEUR RADIO

1017 PM     HAIL             MEDICINE MOUND          34.19N 99.59W
05/16/2010  E1.75 INCH       HARDEMAN           TX   AMATEUR RADIO

1040 PM     HAIL             6 S CHILLICOTHE         34.17N 99.51W
05/16/2010  E1.75 INCH       HARDEMAN           TX   AMATEUR RADIO

CR/AG/FM

Courtesy US National Weather Service

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