463  
FOUS30 KWBC 060054  
QPFERD  
 
EXCESSIVE RAINFALL DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
854 PM EDT SAT SEP 5 2026  
 
DAY 1  
VALID 01Z SUN SEP 06 2026 - 12Z SUN SEP 06 2026  
 
...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL FOR THE CENTRAL  
WESTERN HIGH PLAINS AND SOUTHEAST FLORIDA...  
   
..CENTRAL WESTERN HIGH PLAINS
 
 
EXPANDED THE MARGINAL RISK AREA INTO WESTERN NE PER RATHER ROBUST  
CONVECTION THAT FIRED EARLY THIS EVENING ALONG A SURFACE TROUGH AND  
CONTINUES AT 01Z. SLOWER MOVEMENT OF THESE CELLS, WHICH HAVE  
EXHIBITED SOME MERGING IN ROUGHLY THE SAME AREA, COULD SUPPORT A  
FLASH FLOODING RISK INTO THE LATER EVENING HOURS. THIS THREAT COULD  
SLIP SOUTHEASTWARD AS WELL JUST SOUTH OF THE SAND HILLS WHERE  
INSTABILITY REMAINS. TO THE SOUTH, ISOLATED CONVECTION PERSISTS  
OVER MOSTLY NORTHEASTERN NEW MEXICO INTO SOUTHEASTERN CO AND THE OK  
PANHANDLE, AND HAVE ADJUSTED THE AREA A BIT EASTWARD. REMOVED THE  
SOUTHERN AND SOUTHWESTERN PORTIONS OF THE MARGINAL RISK AS MOST  
ACTIVITY HAS BECOME QUITE ISOLATED.  
   
..SOUTHERN OHIO VALLEY THROUGH THE CAROLINAS
 
 
EARLIER CONVECTION OVER THE NC COASTAL PLAIN HAS MOSTLY PUSHED  
SOUTHEASTWARD/OFFSHORE, WITH GENERALLY LIGHTER RAINFALL IN ITS  
WAKE. WE HAVE REMOVED THE MARGINAL RISK WITH THIS UPDATE.  
 
ACROSS THE OHIO VALLEY, ISOLATED CONVECTIVE CELLS NEAR THE FRONTAL  
BOUNDARY REMAIN THIS EVENING BUT HAVE NOT YIELDED A HEAVY RAIN  
THREAT. WE HAVE REMOVED THE MARGINAL RISK FROM THIS AREA AS WELL.  
   
..GULF COAST/FLORIDA
 
 
CONVECTION OVER SOUTHEASTERN TX INTO SOUTHERN LA HAS DIMINISHED  
AND SHOULD CONTINUE TO WEAKEN THROUGH THE EVENING SO THE MARGINAL  
RISK AREAS HAS BEEN REMOVED.  
 
ACROSS FL, CONVECTION CONTINUES OVER THE CENTRAL/EASTERN PORTION  
OF THE SOUTHERN HALF OF THE PENINSULA WHERE 2-3" OF RAIN (IN AN  
HOUR OR SO) HAS FALLEN. COVERAGE SHOULD STEADILY DECREASE INTO THE  
LATER EVENING HOURS, BUT MAINTAINED THE MARGINAL RISK HERE FOR  
ESPECIALLY THE NEXT HOUR OR TWO BEFORE ALL HEAVIER RAINFALL LIKELY  
SUBSIDES.  
 
FRACASSO  
 
 
DAY 2  
VALID 12Z SUN SEP 06 2026 - 12Z MON SEP 07 2026  
 
...THERE IS A SLIGHT RISK OF EXCESSIVE RAINFALL PORTIONS OF THE  
GREAT BASIN AND SOUTHEASTERN U.S...  
   
..GREAT BASIN.
 
 
20Z UPDATE: CHANGES TO THE PREVIOUS SLGT WERE TO EXTEND THE RISK  
DOWN INTO PORTIONS OF THE MOJAVE DESERT WITH EMPHASIS ON THE AREA  
ENCOMPASSING DEATH VALLEY AND SURROUNDS. TRENDS ARE FOR LOCALLY  
HEAVY CONVECTION TO OCCUR NEAR THOSE AREAS BY SUNDAY AFTERNOON WITH  
RAINFALL RATES BETWEEN 0.5-0.75"/HR POSSIBLE IN THE STRONGER CELL  
CORES. THESE AREAS ARE SUSCEPTIBLE TO FLASH FLOODING IN THESE TYPES  
OF ENVIRONMENTS AND PROJECTED RATES, SO WANTED TO COVER FOR THE  
THREAT GIVEN THE SUSCEPTIBILITY.  
 
ELSEWHERE INTO UT, EXTENDED THE SLGT TO INCLUDE MUCH OF CENTRAL UT  
TOWARDS THE UINTA RANGE WHERE MODELS HAVE TRENDED HIGHER IN THEIR  
QPF SIGNALS AS WE APPROACH THE TIME FRAME OF INTEREST. ANYTIME YOU  
CAN ADVECT PWAT ANOMALIES OF +3 OR GREATER INTO THE REGION, THE  
PROSPECTS FOR FLASH FLOODING BECOME MUCH GREATER OVER THIS AREA OF  
THE COUNTRY AS PAST EVENTS WOULD CONCUR. QPF BETWEEN 1-2" IS  
FORECAST FROM SOUTHWESTERN UT UP THROUGH CENTRAL UT, INCLUDING THE  
MORE FAVORABLE SLOT CANYON AREAS IN ZION AND BRYCE CANYON NATIONAL  
PARKS. HREF PROBS FOR THESE TOTALS ARE SOLIDLY >60% EVERYWHERE IN  
THE CURRENT SLGT RISK ISSUED, A SIGNAL THAT TYPICALLY CORRELATES TO  
THE SLGT RISK THREAT.  
 
KLEEBAUER  
 
..PREVIOUS DISCUSSION..  
 
AN UPPER LOW CENTERED ALONG THE PACIFIC NORTHWEST COAST EARLY IN  
THE PERIOD IS EXPECTED MOVE INLAND, REACHING THE NORTHERN  
INTERMOUNTAIN WEST BY THE CLOSE OF THE PERIOD. MEANWHILE, A SERIES  
OF SHORTWAVES MOVING ALONG THE BASE OF THE ASSOCIATED TROUGH WILL  
TRACK ACROSS SOUTHERN CALIFORNIA BEFORE LIFTING NORTHEAST THROUGH  
THE GREAT BASIN. IN ADDITION TO THIS ENERGY, SOUTHWESTERLY FLOW  
WILL TAP TROPICAL MOISTURE ASSOCIATED WITH MARIA, SUPPORTING AN  
IMPRESSIVE PW ANOMALY AXIS (+3 STD DEV) EXTENDING FROM SOUTHERN  
CALIFORNIA TO CENTRAL UTAH. THIS MOISTURE ALONG WITH LARGE-SCALE  
ASCENT AFFORDED BY THE AFOREMENTIONED SHORTWAVES AND UPPER JET  
FORCING IS EXPECTED TO SET THE STAGE FOR WIDESPREAD SHOWER AND  
THUNDERSTORM ACTIVITY. HOWEVER, LIMITED INSTABILITY REMAINS A  
POTENTIALLY FACTOR WITH REGARDS TO RAINFALL RATES. A SLIGHT RISK  
REMAINS WHERE MODELS CONTINUE TO SIGNAL WHERE MOISTURE, LIFT, ALONG  
WITH OROGRAPHIC EFFECTS WILL SUPPORT AN ENHANCED THREAT FOR  
HEAVIER AMOUNTS. ONLY MINOR ADJUSTMENTS WERE MADE TO THE PREVIOUS  
SLIGHT RISK AREA EXTENDING FROM SOUTHERN NEVADA AND NORTHWESTERN  
ARIZONA TO CENTRAL UTAH, INCLUDING A SMALL SHIFT TO THE NORTH THAT  
REFLECTS THE LATEST TREND IN THE GUIDANCE. REMAINING IN THIS AREA  
ARE SOME OF THE MORE FLASH FLOOD PRONE AREAS IN SOUTHWESTERN UTAH.  
 
FARTHER EAST, MORE TYPICAL MONSOON MOISTURE WILL SUPPORT DIURNAL  
ACTIVITY, WITH THE POTENTIAL FOR ISOLATED FLASH FLOODING ACROSS  
SOUTHEASTERN ARIZONA, NEW MEXICO, AND SOUTHERN COLORADO.  
 
ELSEWHERE, A BROAD MARGINAL RISK WAS MAINTAINED TO THE NORTH,  
COVERING PORTIONS OF THE NORTHWEST, NORTHERN ROCKIES, AND HIGH  
PLAINS. THE PREVIOUSLY NOTED UPPER LOW/TROUGH IS EXPECTED TO  
SUPPORT WIDESPREAD ACTIVITY. INSTABILITY WEST OF THE ROCKIES WILL  
REMAIN QUITE LIMITED, HOWEVER RATES MAY BECOME SUFFICIENT TO RAISE  
ISOLATED CONCERNS, ESPECIALLY ACROSS RECENT BURN SCARS.  
   
..SOUTHEAST
 
 
20Z UPDATE: THE CURRENT FORECAST WAS MAINTAINED FOR AREAS  
ENCOMPASSED IN THE SLGT RISK OVER SC INTO THE NORTHERN COAST OF GA.  
THE SLGT WAS EXPANDED TO THE SOUTH OVER MUCH OF SOUTHEASTERN GA  
DOWN INTO NORTHEASTERN FL AS TRENDS REMAIN FAVORABLE FOR A BIT MORE  
PROGRESSION OF THE OUTLINED FRONT, BELOW. HREF NEIGHBORHOOD AND EAS  
PROBABILITIES TOOK A NOTABLE JUMP IN THE LATEST RUN WITH THE LATTER  
NOW INDICATING A 40-60% PROB FOR AT LEAST 1", SOMETHING NOTABLY  
MORE PREVALENT WITH SLGT RISKS ACROSS THE SOUTHEASTERN CONUS. AREAL  
INSTABILITY WILL RUN BETWEEN 2000-3000 J/KG SBCAPE, ON AVERAGE WITH  
PWAT FIRMLY >2" ACROSS THE AREA SITUATED ALONG AND SOUTH OF THE  
FRONT. LOW-LEVEL CONVERGENCE PATTERN NEAR THE COASTAL PLAIN FROM  
AREAS SOUTH OF CHARLESTON, SC DOWN INTO JACKSONVILLE WILL  
ULTIMATELY AID IN CONVECTIVE INITIATION SUNDAY AFTERNOON WITH A  
STEADY PROGRESSION SOUTHWARD AS WE MOVE THROUGH THE PERIOD.  
HEAVIEST RAINFALL WILL BEGIN OVER SC/GA AND MIGRATE INTO NORTHERN  
FL BY LATE-AFTERNOON, CARRYING INTO THE EVENING. IN COORDINATION  
WITH THE LOCAL JACKSONVILLE WFO, A THE SLGT RISK WAS EXPANDED  
SOUTHWARD TO ACCOUNT FOR THE THREAT AND TRENDS IN THE LATEST CAMS.  
 
KLEEBAUER  
 
..PREVIOUS DISCUSSION..  
 
ENERGY DROPPING INTO THE BASE OF A BROADER-SCALE  
TROUGH CENTERED ALONG THE EAST COAST IS EXPECTED TO SUPPORT A WEAK  
WAVE DEVELOPING ALONG A MOISTURE-LADEN FRONT EXTENDING FROM THE  
COAST NEAR THE SOUTH CAROLINA-GEORGIA BORDER BACK ACROSS THE  
SOUTHEAST. MODELS CONTINUE TO SIGNAL HEAVY AMOUNTS NEAR THE COAST,  
BUT ALSO SOME POTENTIAL FOR HEAVY RAINS AND POTENTIAL FLASH  
FLOODING EXTENDING AS FAR NORTH AS UPSTATE SOUTH CAROLINA AND  
WESTERN NORTH CAROLINA AS DEEP MOISTURE IS DRAWN NORTHWEST BY THE  
DEVELOPING WAVE. REFLECTING THE OVERNIGHT MODEL TRENDS, THE SLIGHT  
RISK WAS SHIFTED A LITTLE FARTHER SOUTH, BUT ALSO EXTENDED  
NORTHWEST ALONG THE SOUTH CAROLINA-GEORGIA BORDER.  
 
PEREIRA  
   
..MONTANA
 
 
BROAD UPPER TROUGH WITH SEVERAL MID-LEVEL SHORTWAVES EJECTING  
NORTHEAST THROUGH THE NORTHERN ROCKIES AND HIGH PLAINS OF MT WILL  
CREATE A PERIOD OF HEAVY RAINFALL POTENTIAL IN THE FORM OF  
SCATTERED THUNDERSTORMS, SOME STRONG TO SEVERE IN THEIR MATURATION.  
PWAT ANOMALIES BASED ON THE LATEST NAEFS SHOW A +2 TO +3 STANDARD  
DEVIATION LOCATED OVER MUCH OF CENTRAL AND EASTERN MT WITH THE  
MAXIMA LOCATED ALONG THE NORTHERN TIER OF THE STATE, NORTH OF THE  
GREAT FALLS TO GLASGOW LINE. RELEVANT INSTABILITY ON THE ORDER OF  
1500-2500 J/KG MUCAPE ALONG WITH THE ELEVATED PWATS, AMPLE MID-  
LEVEL FORCING, AND INCREASING BULK SHEAR WILL BE SUFFICIENT FOR  
LOCALLY HEAVY RAINFALL THREATS WITHIN ANY CONVECTIVE GENESIS DURING  
THE SUNDAY EVENING AND OVERNIGHT TIME FRAME. RATES BETWEEN 1-2"/HR  
AT PEAK INTENSITY WILL OFFER THE THREAT FOR LOCALIZED FLASH FLOOD  
CONCERNS, ESPECIALLY IN ANY URBAN FOOTPRINT AND FLASHIER SMALL  
STREAMS LITTERED ACROSS THE REGION. ONE CAVEAT TO A MORE  
SUBSTANTIAL RISK IS THE PROGRESSIVE CELL MOTIONS ANTICIPATED AS THE  
MEAN FLOW WILL ALLOW FOR STORM MOTIONS TO AVERAGE AT LEAST 30KTS TO  
THE NORTH-NORTHEAST AFTER THEIR INITIATION. THIS SHOULD LIMIT MORE  
WIDESPREAD FLASH FLOOD CHANCES, HOWEVER THIS SETUP IS CLOSE TO  
SOMETHING MORE PROMINENT COMPARED TO THE, "RUN OF THE MILL" THREAT  
WE SEE THIS TIME OF YEAR. A MRGL RISK WAS MAINTAINED FOR THE AREA,  
HOWEVER THIS IS AN AREA OF INTEREST FOR AN UPGRADE IF THE SIGNAL  
BECOMES MORE AGGRESSIVE WITHIN FUTURE CAM FORECASTS. THE RISK  
REMAINS ON THE UPPER THRESHOLD OF MRGL FOR THE TIME BEING.  
   
..NORTHERN PLAINS TO THE LOWER MISSOURI VALLEY
 
 
MULTIPLE SHORTWAVES WILL ROUND THE RIDGE AND ENTER INTO THE  
NORTHERN PLAINS AND MISSOURI RIVER VALLEY BETWEEN NE/IA DURING THE  
COURSE OF THE D2. ELEVATED PWATS AND A PREVAILING LLJ IN THE  
MORNING AND FOLLOWING EVENING HOURS WILL OFFER THE OPPORTUNITY FOR  
LOCALLY ENHANCED CONVECTIVE PATTERNS WITH ANY THUNDERSTORMS CAPABLE  
OF RAINFALL RATES BETWEEN 1-2"/HR AT THEIR PEAK INTENSITY. FFG'S  
ACROSS WESTERN IA INTO EASTERN NE REMAIN ON THE HIGHER SIDE AND THE  
ANTECEDENT SOILS ARE GENERALLY DRY, EVEN AFTER BEING IMPACTED BY  
CONVECTION EARLIER THIS MORNING. IN ANY CASE, THE PROSPECT FOR 2-4"  
OF RAINFALL WITHIN THE GENERAL AREA ABOVE SEEMS MORE SUBSTANTIAL  
THAN NORMAL CONSIDERING THE LATEST HREF AND NBM PROBABILITIES >60%  
FOR AT LEAST 2" ACROSS THE AREA. CONSIDERING THE ANTECEDENT SOILS  
IN THE AREA AND TOTAL RAINFALL BEING SPLIT BETWEEN TWO TIME FRAMES  
IN THE PERIOD, OPTED TO MAINTAIN THE MRGL RISK, BUT A FUTURE SLGT  
IS POSSIBLE WITH A TARGET MAINLY FOR THAT MISSOURI RIVER BASIN  
WHERE FLASH FLOODING CONCERNS IN SEVERAL LARGER CITIES/TOWNS ALONG  
THE RIVER ARE HEIGHTENED COMPARED TO AREAS AWAY FROM THE RIVER.  
   
..SOUTHEAST TEXAS
 
 
ISOLATED TO SCATTERED THUNDERSTORMS ARE FORECAST ACROSS SOUTHEAST  
TX, INCLUDING THE UPPER TEXAS COAST INTO THE PINEY WOODS AREA THAT  
IS STILL RECOVERING FROM IMPACTS FROM EDOUARD. AREA FFG'S ARE  
CONSIDERABLY LOWER THAN NORMAL THANKS TO SATURATED GROUNDS POST  
STORM, SO THE THREAT FOR FLASH FLOODING IN ANY CELLS PRODUCING  
>2"/HR RATES IS HIGHER LEADING TO A LOCALIZED FLASH FLOOD THREAT.  
IN COORDINATION WITH THE LOCAL HOUSTON WFO, A MRGL RISK WAS ADDED  
OVER THE AFOREMENTIONED AREAS.  
 
KLEEBAUER  
 
 
DAY 3  
VALID 12Z MON SEP 07 2026 - 12Z TUE SEP 08 2026  
 
...THERE IS A MARGINAL RISK FOR EXCESSIVE RAINFALL ACROSS PORTIONS  
OF THE SOUTHWEST, NORTHERN ROCKIES, NORTHERN PLAINS, UPPER MIDWEST, AND  
THE SOUTHEAST...  
 
20Z UPDATE: THE PREVIOUS MRGL RISK ISSUANCES ACROSS THE CONUS WERE  
GENERALLY MAINTAINED OUTSIDE A FEW MINOR ADJUSTMENTS OVERALL. THE  
GENERAL SYNOPTIC PATTERN WILL REMAIN ACTIVE OVER PARTS OF THE  
NORTHERN TIER OF THE CONUS, AS WELL AS THE SOUTHEAST AND SOUTHWEST,  
RESPECTIVELY. QPF MAGNITUDES IN PLACEMENT MAINTAINED A SUITABLE RUN  
TO RUN CONSISTENCY THAT ALLEVIATED ANY REASON TO MAKE NOTEWORTHY  
CHANGES. CONSIDERING THE CONSISTENCY IN THE GUIDANCE, MAINTAINED  
CONTINUITY TO THE PREVIOUS FORECAST(S).  
 
KLEEBAUER  
 
..PREVIOUS DISCUSSIONS..  
   
..NORTHERN ROCKIES TO THE HIGH PLAINS
 
 
AN UPPER LOW/TROUGH WILL CONTINUE TO TRANSLATE EAST, REACHING THE  
NORTHERN HIGH PLAINS/SOUTHERN CANADIAN PRAIRIE BY TUESDAY MORNING.  
MID-LEVEL ENERGY AND UPPER JET FORCING INTERACTING WITH NOTABLE PW  
ANOMALIES (+2 STD DEV) WILL CONTRIBUTE TO WIDESPREAD PRECIPITATION,  
WITH SOME OROGRAPHICALLY-FOCUSED HEAVIER AMOUNTS. RAINFALL RATES  
WILL LIKELY BE CHECKED BY LIMITED INSTABILITY, BUT MAY BE  
SUFFICIENT TO CAUSE ISOLATED RUNOFF CONCERNS, ESPECIALLY IN  
VULNERABLE AREAS.  
   
..NORTHERN PLAINS INTO THE UPPER MISSISSIPPI VALLEY
 
 
MOISTURE WILL CONTINUE TO DEEPEN ACROSS THE REGION AS SOUTHERLY  
FLOW INTENSIFIES AHEAD OF THE PREVIOUSLY NOTED UPPER TROUGH MOVING  
OUT OF THE WEST. THIS IS EXPECTED TO FUEL SHOWERS AND STORMS  
DEVELOPING AHEAD OF A STRONG COLD FRONT MOVING ACROSS THE NORTHERN  
PLAINS, WITH HEAVY AMOUNTS POSSIBLE, ESPECIALLY ACROSS PORTIONS OF  
NORTHERN MINNESOTA.  
   
..SOUTHWEST
 
 
ADDITIONAL SHOWERS AND STORMS ALONG AN AXIS SIMILAR TO THE PREVIOUS  
DAY ARE EXPECTED ACROSS PORTIONS OF EASTERN ARIZONA, WESTERN TO  
CENTRAL NEW MEXICO, AND SOUTHERN COLORADO - WHERE PW ANOMALIES WILL  
REMAIN AROUND 2 STD DEV ABOVE NORMAL.  
   
..SOUTHEAST
 
 
DEEP MOISTURE WILL REMAIN CENTERED ALONG A FRONT THAT WILL CONTINUE  
TO SINK SLOWLY SOUTH ACROSS THE SOUTHEAST. PWS AROUND 2 INCHES,  
ALONG WITH WEAK MID-TO-UPPER LEVEL FORCING, WILL HELP ACCENTUATE  
DIURNAL ACTIVITY -- RAISING THE POTENTIAL FOR HEAVY AMOUNTS AND  
POSSIBLE FLASH FLOODING ACROSS PARTS OF THE SOUTH CAROLINA  
LOW COUNTRY, SOUTHERN GEORGIA, AND NORTH FLORIDA.  
 
PEREIRA  
 
 
DAY 4 AND DAY 5  
 
VALID 12Z TUE SEP 08 2026 - 12Z THU SEP 10 2026  
 
...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL ACROSS THE  
SOUTHWEST/CALIFORNIA, PLAINS, GREAT LAKES, AND NORTHEAST...  
   
..SOUTHWEST
 
 
AN AXIS OF ABOVE AVERAGE PW VALUES WILL STRETCH FROM THE SOUTHWEST,  
NORTHEASTWARD THROUGH THE CENTRAL PLAINS AND INTO THE UPPER  
MISSISSIPPI VALLEY AND UPPER LAKES REGION. SCATTERED MONSOONAL  
CONVECTION LIKELY TO CONTINUE ACROSS THE SOUTHWEST DAY 4,  
SUPPORTING LOCALLY HEAVY RAINS AND ISOLATED RUNOFF ISSUES. BY DAY  
5, PW VALUES EXPECTED TO BECOME INCREASINGLY ANOMALOUS ACROSS THE  
SOUTHWEST, SOUTHERN TO CENTRAL CALIFORNIA, AND INTO THE GREAT  
BASIN. THIS IS THE RESULT OF THE RE-AMPLIFICATION OF THE MID TO  
UPPER LEVEL TROF OFF THE NORTHERN TO CENTRAL CALIFORNIA COAST THAT  
WILL BE CAPTURING TROPICAL MOISTURE FROM IN THE VICINITY OF MARIE  
AND ADVECTING IT NORTHEASTWARD. SCATTERED CONVECTION IN THIS  
ANOMALOUS PW AXIS, 2-3+ STANDARD DEVIATIONS ABOVE THE MEAN, WILL  
SUPPORT LOCALLY HEAVY RAINS AND ISOLATED RUNOFF ISSUES FROM THE  
SIERRA, INTO SOUTHEAST CALIFORNIA, THE DESERT SOUTHWEST AND  
PORTIONS OF THE SOUTHERN ROCKIES.  
   
..UPPER MISSISSIPPI VALLEY INTO THE UPPER LAKES
 
 
A FRONTAL BOUNDARY IS EXPECTED TO BE PROGRESSIVE DAY 4 MOVING FROM  
THE UPPER MISSISSIPPI VALLEY INTO THE UPPER LAKES. THE  
SOUTHWESTERN PORTION OF THE FRONT WILL BECOME ORIENTED MORE  
SOUTHWEST-TO-NORTHEAST ALONG THE SOUTHERN EDGE OF THE WESTERLIES.  
AT THIS TIME THE LOW LEVEL INFLOW INTO THIS FRONT IS ALSO EXPECTED  
TO BECOME MORE PARALLEL TO THE BOUNDARY, SUPPORTING POTENTIAL FOR A  
PERIOD OF TRAINING ALONG THE FRONT TUESDAY NIGHT INTO EARLY  
WEDNESDAY. THE HEAVY RAIN THREAT CONTINUES INTO DAY 5, FOCUSED FROM  
THE WESTERN CENTRAL HIGH PLAINS EASTWARD TO THE MID-MISSISSIPPI  
VALLEY WHERE PW VALUES WILL BE +1 TO +2 SIGMA. SOME ORGANIZED  
CONVECTION IS POSSIBLE, WITH HEAVY RAIN AND ISOLATED RUNOFF ISSUES.  
   
..NORTHERN NEW YORK STATE INTO NORTHERN NEW ENGLAND
 
 
THE NORTHERN AND EASTERN EXTENSION OF THE FRONT OVER THE CENTRAL  
PLAINS TO MID MS VALLEY REGION IS EXPECTED TO REMAIN PROGRESSIVE  
DAY 5 AS IT PUSHES FROM THE GREAT LAKES INTO THE NORTHEAST. THERE  
IS THE POTENTIAL FOR ORGANIZED FRONTAL CONVECTION IN AN AXIS OF PW  
VALUES 1.75-2" MOVING EASTWARD ACROSS NY STATE INTO NEW ENGLAND. A  
MARGINAL RISK WAS DEPICTED WHERE FFG VALUES ARE RELATIVELY LOW  
ACROSS NORTHERN NY STATE INTO NORTHERN NEW ENGLAND. THE VERY  
PROGRESSIVE NATURE OF THE FRONT WILL BE A DETRIMENT TO ANY  
WIDESPREAD RUNOFF ISSUES.  
 
FRACASSO/ORAVEC  
 
 
DAY 1 THREAT AREA: HTTPS://WWW.WPC.NCEP.NOAA.GOV/QPF/94EPOINTS.TXT  
DAY 2 THREAT AREA: HTTPS://WWW.WPC.NCEP.NOAA.GOV/QPF/98EPOINTS.TXT  
DAY 3 THREAT AREA: HTTPS://WWW.WPC.NCEP.NOAA.GOV/QPF/99EPOINTS.TXT  
 

 
 
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