Flash Flood Warning 18, NWS Norman, OK

000 
WGUS74 KOUN 131422
FFSOKC
OKC011-039-043-131615-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
921 AM CDT THU JUN 13 2002

FLASH FLOOD WARNINGS REMAIN IN EFFECT FOR DEWEY COUNTY UNTIL 10 
AM...FOR CUSTER COUNTY UNTIL 1115 AM...AND FOR SOUTHERN BLAINE 
COUNTY UNTIL 1130 AM. 

RADAR RAINFALL ESTIMATES INDICATE THAT THE HEAVIEST RAINFALL THIS 
MORNING HAS FALLEN IN A BAND ALONG AND NEAR THE SOUTH CANADIAN RIVER 
VALLEY...FROM NEAR CAMARGO...TO PUTNAM...TO THOMAS...TO JUST 
NORTHEAST OF HYDRO. OBSERVED RAINFALL TOTALS CONFIRM THAT MANY AREAS 
HAVE RECEIVED RAINFALL AT RATES FROM 1.5 TO 3 INCHES PER HOUR IN 
THESE AREAS. MODERATE TO HEAVY RAIN WILL CONTINUE THROUGH LATE 
MORNING IN MOST OF THESE AREAS...LIKELY BRINGING MORNING RAINFALL 
TOTALS TO BETWEEN 3 AND 6 INCHES WITH ISOLATED HIGHER AMOUNTS.

MOST OF THE AFFECTED AREAS ARE RURAL...BUT REPORTS FROM THE THOMAS 
POLICE DEPARTMENT INDICATE THAT CARS HAVE BEEN WASHED OFF THE ROAD 
INTO DITCHES IN THOMAS THIS MORNING.   

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO
HIGHER GROUND.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARM LANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

LAT...LON 3588 9821 3557 9833 3559 9925 3614 9936

24

000 
WGUS74 KOUN 131508
FFSOKC
OKC011-039-131600-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1002 AM CDT THU JUN 13 2002

FLASH FLOOD WARNINGS REMAIN IN EFFECT UNTIL 1115 AQM FOR EASTERN 
CUSTER COUNTY...AND UNTIL 1130 AM FOR SOUTHERN BLAINE COUNTY. 

RADAR RAINFALL ESTIMATES AND RAINFALL OBSERVATIONS INDICATE THAT 
RAIN HAS FALLEN THIS MORNING AT RATES OF 1 TO 3 INCHES PER HOUR IN A 
BAND FROM NEAR THOMAS...SOUTHEAST ALONG THE SOUTH CANADIAN RIVER TO 
JUST NORTHEAST OF HYDRO. INITIAL REPORTS INDICATE THAT THIS IS 
WELCOME RAINFALL FOR AREAS THAT HAVE BEEN ABNORMALLY DRY RECENTLY. 
THE HEAVIEST THUNDERSTORMS HAVE MOVED OFF TO THE SOUTHEAST OF THE 
WARNING AREA...BUT STEADY MODERATE RAIN WILL AFFECT MUCH OF THE AREA 
FOR ANOTHER 1 TO 2 HOURS. RESULTING RUNOFF WILL MEAN A CONTINUED 
POSSIBILITY OF LOCAL FLASH FLOODING...MAINLY IN RURAL AREAS. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO
HIGHER GROUND.

KEEP CHILDREN FROM PLAYING NEAR RUSHING FLOOD WATERS. THE BANKS OF
STREAMS AND FLOODWAYS ARE SLIPPERY AND RAIN SOFTENED GROUND MAY GIVE
WAY EASILY. DO NOT LET YOUR CHILD BE A VICTIM OF DANGEROUS FLOOD
WATERS

LAT...LON 3578 9832 3554 9832 3560 9899 3584 9898

24

000 
WGUS74 KOUN 131513 CCA
FFSOKC
OKC011-039-131600-

FLASH FLOOD STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE NORMAN OK
1002 AM CDT THU JUN 13 2002

FLASH FLOOD WARNINGS REMAIN IN EFFECT UNTIL 1115 AM FOR EASTERN 
CUSTER COUNTY...AND UNTIL 1130 AM FOR SOUTHERN BLAINE COUNTY. 

RADAR RAINFALL ESTIMATES AND RAINFALL OBSERVATIONS INDICATE THAT 
RAIN HAS FALLEN THIS MORNING AT RATES OF 1 TO 3 INCHES PER HOUR IN A 
BAND FROM NEAR THOMAS...SOUTHEAST ALONG THE SOUTH CANADIAN RIVER TO 
JUST NORTHEAST OF HYDRO. INITIAL REPORTS INDICATE THAT THIS IS 
WELCOME RAINFALL FOR AREAS THAT HAVE BEEN ABNORMALLY DRY RECENTLY. 
THE HEAVIEST THUNDERSTORMS HAVE MOVED OFF TO THE SOUTHEAST OF THE 
WARNING AREA...BUT STEADY MODERATE RAIN WILL AFFECT MUCH OF THE AREA 
FOR ANOTHER 1 TO 2 HOURS. RESULTING RUNOFF WILL MEAN A CONTINUED 
POSSIBILITY OF LOCAL FLASH FLOODING...MAINLY IN RURAL AREAS. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO
HIGHER GROUND.

KEEP CHILDREN FROM PLAYING NEAR RUSHING FLOOD WATERS. THE BANKS OF
STREAMS AND FLOODWAYS ARE SLIPPERY AND RAIN SOFTENED GROUND MAY GIVE
WAY EASILY. DO NOT LET YOUR CHILD BE A VICTIM OF DANGEROUS FLOOD
WATERS

LAT...LON 3578 9832 3554 9832 3560 9899 3584 9898

CORRECTED TYPO FIRST LINE...
24

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
345 AM CDT THU JUN 13 2002

FIRST MCS MOVING SE OUT OF AREA THIS MORNING AND ANOTHER TAKING
SHAPE TO OUR NW AS SMALL DISTURBANCES ROTATE AROUND PERIPHERY OF
LARGER UPPER LOW ACROSS NORTHERN PLAINS. A COUPLE OF THESE
DISTURBANCES LOOK TO MOVE OUT OF CENTRAL ROCKIES OUT INTO PLAINS
TODAY. MODELS ALSO INDICATE A 70-80KT UPPER JET MOVING ACROSS KS/MO
TODAY...PUTTING AREA IN RR QUAD. WILL GO WILL LIKELY POPS TODAY AND
WILL EXTEND THE FFA FOR ENTIRE DAY TODAY. WILL RECONFIGURE WATCH AS
WELL...BASED ON WHAT HAPPENED EARLIER AND WHAT IS EXPECTED TODAY.

EVEN WITH MULTIPLE BOUNDARIES AROUND THIS MORNING...MAIN SYNOPTIC
FRONT REMAINS NORTH OF STATE ACROSS KS. WITH DESCENT PUSH OF COOL
AIR ACROSS NORTHERN/CENTRAL ROCKIES AND MORE PRECIP DEVELOPING ALONG
BOUNDARY...FRONT SHOULD MOVE SOUTH ACROSS STATE DURING THE DAY
TODAY. THIS WILL ALLOW PRECIP CHANCES TO SHIFT SOUTH TONIGHT. WILL
KEEP LOW POPS GOING ALL AREAS TONIGHT WITH DRY CONDITIONS ON FRI.

SFC HIGH SETTLES IN LATE TONIGHT THRU FIRST HALF OF SAT BEFORE
SOUTHERLY FLOW REDEVELOPS. MAY SEE SOME LATE DAY THUNDERSTORMS
ACROSS MAINLY WESTERN SECTIONS ON SAT...SO WILL INTRO SOME LOW POPS
FOR SAT. WILL COOL TEMPS DOWN SOME IN THE EXTENDED AS MODELS SHOW
ANOTHER FRONT MOVING ACROSS ON SUN AS NORTHWEST UPPER FLOW GIVES US
ADDITIONAL OPPORTUNITIES FOR SHWRS/TSTMS. LOW POPS FOR SATURDAY WILL
BE INCREASED SAT NIGHT THROUGH SUN AS DESCENT MCS SIGNAL APPEARS TO
TAKE SHAPE IN MODELS. LOW POPS GO THRU MON AS NORTHWEST FLOW PATTERN
CONT. WILL DRY THINGS OUT FOR TUE AND WED AS ANOTHER SFC HIGH MOVES
SOUTH ACROSS SOUTHERN PLAINS IN THE WAKE OF THE COLD FRONT WHICH
MOVES THRU SUN.

THANKS FOR COORD...TUL.

FCSTID = 30
OKC  81 62 82 60 /  70 30  0  0
HBR  85 63 83 61 /  60 40  0 10
SPS  88 65 86 63 /  60 40  0  0
GAG  80 58 81 58 /  70 20  0 10
PNC  80 59 80 58 /  70 20  0  0
DUA  86 66 83 60 /  70 40  0  0

.OKC...
OK...FLASH FLOOD WATCH TODAY OKZ004>013-015-017>020-024>026-029>032.
TX...NONE.

OKZ004>048-050>052-TXZ083>090-131700-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
700 AM CDT THU JUN 13 2002

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH THIS EVENING
ACROSS ALL OF WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND
WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA INCLUDES THE ENTIRE NWS NORMAN COUNTY WARNING
AREA.

TIMING...
SEVERE THUNDERSTORMS WILL BE POSSIBLE FROM EARLY THIS MORNING
THROUGH THIS EVENING.

IMPACTS...
ALTHOUGH THE PRIMARY CONCERN FROM THE THUNDERSTORMS WILL BE FLOODING
RAINFALL...HAIL TO THE SIZE OF GOLFBALLS AND WIND GUSTS TO 65 MPH
ARE ALSO POSSIBLE WITH THE STRONGEST STORMS. THE LARGE HAIL MAY
DAMAGE AUTOMOBILES AND TENDER VEGETATION...AND THE SEVERE WIND GUSTS
MAY DAMAGE LIGHT WEIGHT STRUCTURES AND TREES.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS THROUGH THIS
EVENING.

DISCUSSION...
WIDESPREAD THUNDERSTORMS WILL BE SEEN AGAIN TODAY...WITH THE
DEVELOPMENT ALREADY UNDERWAY. ENERGY FROM AN INTENSE STORM SYSTEM...
LOCATED OVER THE DAKOTAS...WILL INTERACT WITH A COLD FRONT AND
NUMEROUS OUTFLOW BOUNDARIES ACROSS THE SOUTHERN PLAINS.
THUNDERSTORMS DEVELOPING ACROSS THE OKLAHOMA AND TEXAS
PANHANDLES...ALONG WITH THOSE OVER NORTHWEST OKLAHOMA...WILL MOVE
SOUTH AND EAST DURING THE DAY. MOST...IF NOT ALL OF THE ACTIVITY...
IS EXPECTED TO MOVE SOUTH OF THE NWS COUNTY WARNING AREA BY MID
EVENING. UNTIL THEN...WIDESPREAD THUNDERSTORMS WILL PRODUCE COPIOUS
AMOUNTS OF RAINFALL...ALONG WITH THE POSSIBILITY OF LARGE HAIL AND
DAMAGING WIND GUSTS.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRI JUN 14.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...40 PERCENT.

OTHER HAZARDOUS WEATHER...
VERY HEAVY RAINFALL IS LIKELY TODAY...AS HIGH AMOUNTS OF MOISTURE
WILL BE AVAILABLE FOR SLOW MOVING THUNDERSTORMS. THE THREAT OF FLASH
FLOODING WILL BE ENHANCED IN AREAS THAT RECEIVED HEAVY RAIN ON
WEDNESDAY. A FLASH FLOOD WATCH IS IN EFFECT FOR NORTHERN AND PARTS
OF CENTRAL OKLAHOMA.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT NOON
TODAY.

11