Back-to-back powerful Pacific storm systems to impact the Pacific Northwest and northern California through the end of this week with heavy rain, flooding, strong winds, and higher elevation mountain snow. A strong, long-duration atmospheric river will accompany the Pacific storms, bringing excessive rainfall and flash flooding to southwest Oregon and northwest California through the week. Read More >
A strong upper level low moved over the Southern and Central Plains region during the day on Sunday, December 14, 2014. Adequate moistening and sunshine allowed for modest instability to build within a narrow corridor across central Oklahoma. Isolated thunderstorms developed along a Pacific front/dryline feature during the mid afternoon hours. These storms occasionally exhibited supercell characteristics, producing large hail and funnel clouds. One very brief tornado occurred over northeastern Oklahoma County near Arcadia Lake. No damage or injuries occurred.
The following two graphics show the multi-sensor precipitation estimates (MPE) for the 24-hour period ending at 6 PM CST on December 15, 2014. Rainfall reports for the event generally ranged from about 0.25 to 1.50 inches in the NWS Norman forecast area. One interesting aspect of these rainfall maps is that tracks of individual thunderstorms can be identified where the heavier streaks of precipitation occur in the maps.
NWUS54 KOUN 150408
LSROUN
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE NORMAN OK
1007 PM CST SUN DEC 14 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0347 PM HAIL CHICKASHA 35.04N 97.94W
12/14/2014 E1.25 INCH GRADY OK TRAINED SPOTTER
0348 PM HAIL 2 N CHICKASHA 35.07N 97.94W
12/14/2014 E1.25 INCH GRADY OK STORM CHASER
0350 PM HAIL 3 N CHICKASHA 35.09N 97.94W
12/14/2014 E2.00 INCH GRADY OK TRAINED SPOTTER
0426 PM HAIL 6 WSW OKLAHOMA CITY 35.43N 97.61W
12/14/2014 E1.00 INCH OKLAHOMA OK BROADCAST MEDIA
0435 PM HAIL 4 W OKLAHOMA CITY 35.47N 97.58W
12/14/2014 E1.50 INCH OKLAHOMA OK TRAINED SPOTTER
I-40/I-44 INTERCHANGE
0445 PM HAIL OKLAHOMA CITY 35.47N 97.51W
12/14/2014 E1.75 INCH OKLAHOMA OK BROADCAST MEDIA
DOWNTOWN OKC, PLAZA DISTRICT
0447 PM HAIL OKLAHOMA CITY 35.47N 97.51W
12/14/2014 E2.00 INCH OKLAHOMA OK PUBLIC
DOWNTOWN PLAZA DISTRICT, REPORT VIA SOCIAL MEDIA
0456 PM HAIL 4 SE EDMOND 35.61N 97.43W
12/14/2014 E1.00 INCH OKLAHOMA OK BROADCAST MEDIA
COVERING GROUND AT I-35 AND KILPATRICK TURNPIKE
INTERCHANGE
0502 PM HAIL 5 SE EDMOND 35.60N 97.41W
12/14/2014 E1.75 INCH OKLAHOMA OK NWS EMPLOYEE
NEAR 122ND AND AIR DEPOT BLVD
0509 PM TORNADO 4 SW ARCADIA 35.62N 97.38W
12/14/2014 OKLAHOMA OK BROADCAST MEDIA
KWTV VIDEO. LASTED LESS THAN A MINUTE. NO DAMAGE.
0600 PM TSTM WND GST CENTRAHOMA 34.61N 96.34W
12/14/2014 E65.00 MPH COAL OK PUBLIC
RELAYED BY KTEN TV.
&&
$$
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The following two graphics are screen captures showing 2-hour durations of hail and other weather reports across the NWS Norman forecast area and the OKC metro area from 4-6 PM CST on December 14, 2014. These reports came from various people using the mPING application on their mobile devices. The Meteorological Phenomena Identification Near the Ground (mPING) is a project designed to collect weather information from the public through their smart phone or mobile device with GPS location capabilities. For more information, please visit the mPING website at:
Note: the white circle depict hail size reports. The numeral on the circle is a code that corresponds to a specific hail size. "1" represents a hail size of 0.25"; "2" represents a hail size of 0.50"; "3" represents a hail size of 0.75"; etc.
 Hailstone in Dowtown OKC Photo courtesy Megan Jester |
 Photo courtesy Jason Collins |
 Hailstones in the OKC Plaza District Photo courtesy Dustin Akers |
 Hailtone near NW 10th & Penn in OKC Photo courtesy Curtis Schwab |
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