Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 439, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Sep 14, 2002, 8:52 PM CDT for Pontotoc County, Oklahoma. It was in force for 28 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 14, 2002, 8:52 PM CDT (01:52 UTC)
- Expired
- Sep 14, 2002, 9:20 PM CDT
- In force
- 28 min
- Issued by
- NWS Norman, OK
- Area
- Counties, with a storm outline in the text
County Pontotoc County, OK
The radar
The Norman radar (KTLX), 79 km from the middle of the area, began a volume at 01:52 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 14, 9:00 PM CDT | Thunderstorm Wind | Francis, OK | Six inch diameter tree limbs were downed. |
| Sep 14, 9:00 PM CDT | Hail 0.75 | Francis, OK | |
| Sep 14, 9:00 PM CDT | Thunderstorm Wind | Ada, OK | Severe straight-line winds produced an intermittent path of damage on the east side of Ada that was about four miles long and three-quarters of a mile wide, and extended from northwest through southeast. The roof of a dairy barn was blown off. Several barns an |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 1.9 hours before the alert went out and 80 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1380 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1169 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
612 WUUS54 KOUN 150152 SVROKC OKC123-150220- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE NORMAN OK 851 PM CDT SAT SEP 14 2002 THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... PONTOTOC COUNTY IN EAST CENTRAL OKLAHOMA * UNTIL 920 PM CDT * AT 850 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM OVER BYNG...MOVING EAST-SOUTHEAST AT 25 MPH. * LOCATIONS IN THE WARNING INCLUDE ADA...ALLEN...BYNG AND FRANCIS WIND GUSTS FROM 60 TO 70 MPH ARE LIKELY WITH THIS SEVERE STORM. HAIL UP TO THE SIZE OF DIMES IS POSSIBLE. LAT...LON 3491 9682 3477 9679 3470 9642 3490 9641 MILLER
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 14, 3:14 PM CDT, 5 hours 38 minutes earlier.
Area forecast discussion, Sep 14, 3:14 PM CDT, 5 hours 38 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 310 PM CDT SAT 14 2002 FIRST PERIOD POPS WILL BE HEAVILY DEPENDENT ON SATELLITE AND RADAR TRENDS TOWARD ISSUANCE TIME. THERE WILL BE TWO MAIN AREAS/FEATURES TO WATCH. ONE IS ACROSS NORTH CENTRAL ZONES NEAR VORTEX CENTER. MOSTLY INDUCED BY COLD CORE TEMPS...THIS COULD POSE A PROBLEM FOR FLOODING...AS A FAIRLY LARGE AREA OF NORTH CENTRAL OKLAHOMA RECEIVED BETWEEN 2 AND 4+ INCHES OF RAIN EARLY THIS MORNING. A FLASH FLOOD WATCH MAY BE NEEDED IF ACTIVITY BECOMES ORGANIZED...BUT HEAVIEST RAIN STILL EXPECTED FURTHER SOUTH. SECOND IS WEAK SURFACE BOUNDARY...WHICH IS BECOMING BETTER DEFINED ACROSS WEST CENTRAL OKLAHOMA. GIVEN DECENT WARM-UP AHEAD OF BOUNDARY...ALONG WITH WEAKLY CAPPED ENVIRONMENT...THIS FEATURE EXPECTED TO LIGHT UP AND PROVIDE MUCH OF CENTRAL/SOUTHERN OKLAHOMA AND WESTERN NORTH TEXAS TEXAS WITH SHOWERS AND THUNDERSTORMS. IF LINE CAN DEVELOP AND FILL IN...TO WOULD LIKELY MOVE INTO CENTRAL PARTS OF OKLAHOMA LATE THIS AFTERNOON THROUGH EARLY EVENING...THEN SHIFT SOUTH AND EAST. MAIN CONCERN WITH ANY ACTIVITY WILL BE LIGHTNING AND HEAVY RAINFALL. LINGERING (LIGHT) SHOWERS WILL LIKELY BE SEEN ACROSS CENTRAL AND SOUTHERN AREAS AFTER THIS LINE MOVES THROUGH. LOW POPS WILL NEED TO BE KEPT ACROSS EASTERN/SOUTHERN PORTIONS OF FORECAST AREA ON SUNDAY AS UPPER VORT CENTR IS SLOW TO MOVE OUT AND SURFACE FRONT BEGINS TO STALL. THEN...IT APPEARS THAT THERE WILL BE A COUPLE OF DRY SEASONABLE DAYS UNTIL MID WEEK...WHEN MEDIUM RANGE MODELS WANT TO BRING IN ANOTHER SUBSTANTIAL FRONT. DYNAMIC SUPPORT WILL BE THERE FOR POPS TO BE CONTINUED. WILL LEAVE POPS IN THE WEDNESDAY NIGHT AND THURSDAY TIME FRAME FOR NOW. ANOTHER FRONT IS PROGD AGAIN FOR THE WEEKEND. FCSTID = 11 PRELIMINARY CCF NUMBERS... OKC 63 78 57 81 / 80 20 0 0 HBR 62 78 56 83 / 80 10 0 0 SPS 65 81 60 84 / 60 20 0 0 GAG 55 76 49 81 / 60 0 0 0 PNC 59 77 55 80 / 80 20 0 0 DUA 66 81 59 83 / 80 40 0 0 .OUN... OK...NONE. TX...NONE.
In the hours before
Local storm report, Sep 14, 8:02 PM CDT, 50 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
802 PM CDT SAT SEP 14 2002
TIME (CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0640 PM OKLAHOMA CITY OK 60 MPH WIND GUST
09/14/02 OKLAHOMA OKC FIRE DEPT
FMThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 8:48 PM CDT | Severe Thunderstorm Warning | OUN | Carter | 27 min |
| Sep 14, 8:59 PM CDT | Severe Thunderstorm Warning | OUN | Johnston | 46 min |
| Sep 14, 9:14 PM CDT | Severe Thunderstorm Warning | OUN | Coal, Hughes | 46 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2002Every severe thunderstorm warning in 2002
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.