Flash Flood Warning 187, NWS Midland/Odessa, TX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX
338 AM CDT MON OCT 4 2004

.SHORT TERM...
ONLY ISOLATED SHOWERS AND THUNDERSTORMS ARE OVER THE CWA EARLY THIS
MORNING...BUT EXPECTING THIS TO CHANGE DURING THE DAY AS AT LEAST
TWO SHORTWAVE TROUGHS IMPINGE UPON THE CWA TODAY AND TONIGHT.  KMAF
AND SURROUNDING RADARS INDICATING A WEAK BOUNDARY OVER THE NORTHERN
CWA THIS MORNING...PROBABLY FROM CONVECTION YESTERDAY EVENING OVER
NORTHERN NEW MEXICO AND THE TEXAS PANHANDLE.  A COLD FRONT IS
RESIDING A BIT FURTHER NORTH OVER EASTERN COLORADO...THE OKLAHOMA
PANHANDLE...AND SOUTHERN KANSAS WITH MEAGER SURFACE PRESSURE RISES
INDICATED BEHIND SAME.

AFOREMENTIONED BOUNDARY WILL LIKELY PROVIDE A FOCUS FOR THUNDERSTORM
DEVELOPMENT TODAY AS A SHORTWAVE OVER NEW MEXICO SHEARS EAST/
SOUTHEAST.  ANY CONVECTION THAT DEVELOPS OVER THE NORTH/ NORTHEAST
ZONES WILL PROBABLY BENEFIT FROM MARGINAL INSTABILITY AND EXITING
RRQ OF 80 KT H25 JET.  ANOTHER SHORTWAVE TROUGH IN THIS FAST FLOW
ALOFT WILL APPROACH THE AREA FROM THE WEST.  EXPECTING TO SEE
SUNSHINE AGAIN OVER THE SOUTHWESTERN/WESTERN CWA AS THIS WAVE
NEARS.  THE INSTABILITY WHICH RESULTS WILL PROBABLY YIELD A FEW
SEVERE STORMS AS 0 TO 6 KM BULK SHEAR IS PRETTY GOOD AGAIN TODAY.
THINK THE WESTERN THIRD OF THE CWA WILL BE MOST SUSCEPTIBLE TO
SEVERE TSRA AS FLOW WILL DIRECT STORMS EASTWARD INTO BETTER
MOISTURE.  ORGANIZED STORMS WILL PROBABLY PRODUCE LARGE HAIL AND
DAMAGING WINDS... ESPECIALLY SINCE SUPERCELL TSRA COULD DEVELOP IN
MODERATELY UNSTABLE ATMOSPHERE AND LAPSE RATES.  PWATS OF ONE TO ONE
AND A HALF INCHES WILL BE COMMON ACROSS THE CWA TODAY.  FAST MOVING
STORMS MAY LIMIT FLASH FLOODING...BUT CONSIDERING THE AMOUNT OF
MOISTURE INVOLVED... EXPECT TO SEE SOME FLASH FLOODING...AGAIN WITH
EMPHASIS OVER THE WESTERN THIRD OF THE CWA.  INCIDENCE OF FLASH
FLOODING LOOKS TOO ISOLATED FOR A FLASH FLOOD WATCH ATTM.

TONIGHT...SOME SEVERE STORMS WILL PROBABLY STILL BE GOING.  THE
NEXT FRONTAL BOUNDARY WILL MOVE SOUTH INTO THE AREA.  NOT CERTAIN
WHERE IT WILL END UP DUE TO UNCERTAINTY OF PUSH BEHIND BOUNDARY.
ANY OLD OUTFLOW BOUNDARIES AND ANY ONGOING CONVECTION OVER THE CWA
WILL ALSO CONFUSE THE SURFACE FLOW.  WILL DEFER DECISION TO ISSUE A
FLASH FLOOD WATCH TO THE DAY SHIFT AS LOCATIONS TO BE ENCOMPASSED
NOT QUITE CLEAR ENOUGH.  WILL INSTEAD ISSUE ANOTHER SPECIAL WEATHER
STATEMENT TO HIGHLIGHT THE POTENTIAL FOR FLASH FLOODING.

.LONG TERM...
STORMY WEATHER IS FORECAST TO CONTINUE ACROSS WEST TEXAS AND
SOUTHEAST NEW MEXICO THROUGH MUCH OF THE WEEK. AN UPPER LEVEL TROUGH
WILL PROGRESS EAST TOWARD THE GREAT BASIN TUESDAY. A COUPLE OF
POTENT SHORTWAVES WILL EJECT OUT AHEAD OF THIS SYSTEM INTO THE
FORECAST AREA TUESDAY AND TUESDAY NIGHT. THE GFS INDICATES THAT
QUITE A BIT OF INSTABILITY WILL BE PRESENT OVER THE AREA...WITH 850
MB LI/S RANGING FROM -4 TO -7 C. IN ADDITION...DEEP LAYER SHEAR WILL
ALSO INCREASE OVER THE AREA. THEREFORE...SEVERE THUNDERSTORMS WILL
BE POSSIBLE TUESDAY INTO TUESDAY NIGHT. HEAVY RAINFALL AND FLASH
FLOODING WILL ALSO BE A CONCERN. WE HAVE INCLUDED HIGH END CHANCE TO
LIKELY POPS OVER MOST OF THE FORECAST AREA TUESDAY AND TUESDAY NIGHT.

THE UPPER TROUGH WILL PROGRESS SLOWLY EAST WEDNESDAY AND
THURSDAY...WITH THE AXIS OF THE TROUGH IN THE VICINITY OF COLORADO
AND NEW MEXICO BY LATE THURSDAY AFTERNOON. SEVERAL SHORTWAVES WILL
CONTINUE TO TRANSLATE INTO THE FORECAST AREA OUT AHEAD OF THE
TROUGH...WITH SCATTERED SHOWERS AND THUNDERSTORMS REMAINING A DECENT
POSSIBILITY BOTH DAYS. AGAIN IT APPEARS THAT A HEAVY RAIN AND FLASH
FLOODING POTENTIAL WILL REMAIN A POSSIBILITY THROUGH THURSDAY...AS
PRECIPITABLE WATER VALUES REMAIN WELL ABOVE NORMAL. IN
ADDITION...DEEP LAYER SHEAR AND INSTABILITY MAY SUPPORT ISOLATED
SEVERE THUNDERSTORMS...AT LEAST THROUGH WEDNESDAY.

FOR THE EXTENDED PERIOD...THE GFS MODEL FINALLY TAKES THE TROUGH
EAST OF THE AREA LATE SATURDAY AFTERNOON. HOWEVER...IT IS
INTERESTING TO NOTE THE ECMWF MODEL RUN ACTUALLY CUTS OFF A LOW
ACROSS WEST TEXAS FRIDAY AND SATURDAY...WITH THE TROUGH REMAINING IN
THE VICINITY ON SUNDAY. IF THIS OCCURS...THE WET PERIOD MAY
LAST THROUGH THE NEXT 7 DAYS. FOR NOW HAVE TRENDED TOWARD THE GFS
SOLUTION...WITH LOW POPS FRIDAY AND SATURDAY...AND A DRYING TREND ON
SUNDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
BIG SPRING TX             74  58  69  60 /  40  60  60  70
CARLSBAD NM               76  58  69  59 /  50  60  80  70
DRYDEN TX                 79  62  75  63 /  20  40  50  60
FORT STOCKTON TX          78  60  73  61 /  30  50  60  60
GUADALUPE PASS TX         70  55  66  56 /  50  60  80  60
HOBBS NM                  76  56  68  58 /  50  60  80  70
MARFA TX                  77  50  73  52 /  30  50  60  60
MIDLAND INTL AIRPORT TX   75  59  70  60 /  40  60  70  70
ODESSA TX                 76  60  70  60 /  40  60  70  70
WINK TX                   80  59  73  62 /  40  50  70  70

&&

.MAF WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
NM...NONE.

&&

67/21

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX
452 AM CDT MON OCT 4 2004

NMZ027>029-033-034-TXZ045>048-050>053-057>063-067>070-074-075-
079>082-258-042200-
ANDREWS-BIG BEND AREA-BORDEN-CENTRAL LEA COUNTY-CRANE-
DAVIS/APACHE MOUNTAINS AREA-DAWSON-ECTOR-EDDY COUNTY PLAINS-GAINES-
GLASSCOCK-GUADALUPE MOUNTAINS-GUADALUPE MOUNTAINS OF EDDY COUNTY-
HOWARD-LOVING-MARFA PLATEAU-MARTIN-MIDLAND-MITCHELL-
NORTHERN LEA COUNTY-PECOS-PRESIDIO VALLEY-REAGAN-
REEVES COUNTY AND UPPER TRANS PECOS-SCURRY-SOUTHERN LEA COUNTY-
TERRELL-UPTON-VAN HORN AND HIGHWAY 54 CORRIDOR-WARD-WINKLER-
452 AM CDT (352 AM MDT) MON OCT 4 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WEST TEXAS AND SOUTHEASTERN
NEW MEXICO.

.DAY ONE...TODAY

SEVERE THUNDERSTORMS WILL BE POSSIBLE OVER SOUTHEAST NEW MEXICO AND
MUCH OF WEST TEXAS THIS AFTERNOON AND EVENING.  LOCATIONS GENERALLY
ALONG AND WEST OF THE PECOS RIVER WILL BE MOST SUSCEPTIBLE TO SEVERE
THUNDERSTORMS SINCE THE ATMOSPHERE WILL BE MORE UNSTABLE IN THESE
AREAS.  LARGE HAIL AND DAMAGING WINDS WILL BE THE PRIMARY THREATS
FROM THESE THUNDERSTORMS...BUT AN ISOLATED TORNADO CANNOT BE RULED
OUT.

DUE TO THE PLENTIFUL AMOUNT OF MOISTURE IN THE ATMOSPHERE...HEAVY
RAINFALL WILL BE POSSIBLE WITH THESE THUNDERSTORMS TOO.  SOUTHEAST
NEW MEXICO...PORTIONS OF THE PERMIAN BASIN...AND LOCATIONS WEST OF
THE PECOS RIVER APPEAR TO BE MOST LIKELY TO RECEIVE HEAVY RAINFALL...
AND POSSIBLY FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE POSSIBILITY OF SEVERE WEATHER AND HEAVY RAIN WILL CONTINUE OVER
MOST OF THE AREA ON TUESDAY...AND POSSIBLY LAST THROUGH WEDNESDAY.
LARGE HAIL AND DAMAGING WINDS WILL BE THE PRIMARY THREATS...IN
ADDITION TO FLASH FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER GROUPS AND EMERGENCY OFFICIALS SHOULD MONITOR THE LATEST
WEATHER INFORMATION. SPOTTER ACTIVATION MAY BE REQUIRED LATER TODAY
AND TONIGHT.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX
938 AM CDT MON OCT 4 2004

TXZ061-062-041545-
ECTOR TX-MIDLAND TX-
938 AM CDT MON OCT 4 2004

...SIGNIFICANT WEATHER ALERT...

THIS SIGNIFICANT WEATHER ALERT IS FOR ECTOR AND MIDLAND COUNTIES.

A STRONG THUNDERSTORM WAS LOCATED 7 MILES WEST OF ODESSA AT 938 AM
CDT...MOVING EAST AT 35 MPH.  ODESSA AND MIDLAND ARE IN THE PATH OF
THIS STORM.

HAIL TO THE SIZE OF MARBLES...WIND GUSTS TO 50 MPH...AND DEADLY
LIGHTNING ARE POSSIBLE.  RAINFALL RATES IN EXCESS OF ONE INCH PER
HOUR ARE LIKELY.