020
FXUS02 KWBC 021908
PMDEPD
EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
308 PM EDT THU APR 2 2026
VALID 12Z SUN APR 05 2026 - 12Z THU APR 09 2026
..OVERVIEW
AT THE START OF THE MEDIUM RANGE PERIOD SUNDAY, A LOW PRESSURE
SYSTEM WILL BE PULLING AWAY FROM THE GREAT LAKES INTO CANADA, BUT
ITS ASSOCIATED COLD FRONT WILL SWEEP ACROSS THE EASTERN SEABOARD TO
GULF COAST FOR WIDESPREAD RAIN AND THUNDERSTORMS. COOLER
TEMPERATURES AND SOME AREAS OF RAIN/SNOW ARE LIKELY BEHIND THIS
SYSTEM IN THE MIDWEST TO GREAT LAKES REGION EARLY NEXT WEEK AS
ENERGY FEEDS INTO AN UPPER TROUGH. MEANWHILE AN UPPER RIDGE IS
FORECAST TO SET UP OVER THE WEST AND CAUSE ABOVE AVERAGE
TEMPERATURES, MIGRATING EASTWARD AS THE WEEK PROGRESSES. BEHIND IT,
ANOTHER TROUGH/LOW WILL REACH THE WEST AROUND MIDWEEK, LEADING TO
INCREASED PRECIPITATION CHANCES THERE.
..GUIDANCE/PREDICTABILITY ASSESSMENT
MODEL AND ENSEMBLE GUIDANCE CONTINUES TO SHOW GOOD AGREEMENT ON
THE LARGE SCALE PATTERN ACROSS THE CONUS BUT WITH SOME UNCERTAINTY
IN THE DETAILS AND TIMING OF SYSTEMS WHICH HAS IMPLICATIONS ON
SENSIBLE WEATHER GRIDS. WAS ABLE TO USE A MULTI-MODEL BLEND FOR THE
FIRST HALF OF THE PERIOD FOR THE WPC PROGS WITH GOOD CONSENSUS FOR
REINFORCED TROUGHING OVER THE EAST. BY TUESDAY-WEDNESDAY NEXT
WEEK, ADDITIONAL ENERGY WILL SLIDE SOUTHWARD FROM WESTERN CANADA
INTO THE NORTHERN PLAINS WITH POSSIBLE INTERACTION WITH ANOTHER
UPPER LOW TOWARDS THE WEST COAST. GUIDANCE DOES GENERALLY SUGGEST
THESE TWO SHOULD BE SEPARATE FEATURES, BUT ANY EXCHANGE OR
INTERACTION OF ENERGY BETWEEN THE TWO COULD BRING BROADER SENSIBLE
WEATHER IMPACTS. TRANSITIONED THE PROGS FORECAST TOWARDS HALF
DETERMINISTIC GUIDANCE/HALF ENSEMBLE MEANS BY THE SECOND HALF OF
THE PERIOD TO HELP MITIGATE THESE SMALLER SCALE DIFFERENCES.
OVERALL THOUGH, MAINTAINED VERY GOOD CONTINUITY WITH THE PREVIOUS
WPC FORECAST.
..WEATHER/HAZARDS HIGHLIGHTS
A COLD FRONT WILL STRETCH THROUGH THE EASTERN SEABOARD AND BACK
WEST ACROSS THE GULF COAST ON SUNDAY, WITH MOISTURE POOLING AHEAD
OF IT. RAIN AND THUNDERSTORMS ARE FORECAST TO PUSH THROUGH THE EAST
PRETTY QUICKLY, WITH THE FAST FRONTAL MOVEMENT LIKELY PRECLUDING
TOO MANY FLOODING CONCERNS. THE EXCEPTION COULD BE ON THE WESTERN
SIDE OF THE FRONT BACK INTO SOUTHERN TEXAS, WHERE THERE IS A CHANCE
FOR MULTIPLE ROUNDS OF CONVECTION IN AN UNSTABLE AIRMASS ALONG THE
FRONT. A MARGINAL RISK CONTINUES FOR DAY 4/SUNDAY IN THE ERO FOR
POSSIBLE ISOLATED FLOODING IN SOUTH TEXAS. BY MONDAY, THE FRONT IS
FORECAST TO PUSH OFFSHORE OF MOST LAND AREAS INTO THE ATLANTIC AND
GULF, THOUGH IT WILL STILL BE PASSING OVER FLORIDA AND PROVIDE A
FOCUS FOR ABOVE AVERAGE MOISTURE THERE. HAVE CONTINUED TO HOLD OFF
ON ANY EXCESSIVE RAINFALL AREAS THERE FOR DAY 5/MONDAY THOUGH, DUE
TO CONCERNS ABOUT THE HEAVIEST CONVECTION POSSIBLY STAYING
OFFSHORE, BUT FLORIDA IS WORTH MONITORING FOR POTENTIAL FLASH
FLOODING CONCERNS. A WET PATTERN SHOULD PERSIST ACROSS FLORIDA
TUESDAY AND WEDNESDAY AS SOUTHERN STREAM ENERGY COMES ACROSS.
FARTHER NORTH, THE MEAN WESTERLY FLOW IN THE EASTERN TROUGH INTO
EARLY NEXT WEEK WILL ALLOW FOR SOME LAKE EFFECT PRECIPITATION. THEN
AT LEAST ONE ROUND OF RAIN AND SNOW SHOULD MOVE THROUGH THE UPPER
MIDWEST ACROSS THE GREAT LAKES REGION SUNDAY-MONDAY AND POSSIBLY
LASTING IN THE NORTHERN MID-ATLANTIC/NORTHEAST ON TUESDAY. ANOTHER
SWATH OF PRECIPITATION IS POSSIBLE IN THE NORTH-CENTRAL PLAINS TO
MID-MISSISSIPPI VALLEY. MEANWHILE, CONVECTION IS POSSIBLE IN THE
FOUR CORNERS REGION SUNDAY-TUESDAY WITH SOME SOUTHERN STREAM WAVES
ALOFT AND ABOVE AVERAGE MOISTURE. THEN AS AN UPPER LOW/TROUGH MOVES
TOWARD AND INTO THE WEST, IT WILL PROVIDE LIFT FOR PRECIPITATION
IN THE PACIFIC NORTHWEST/NORTHERN CALIFORNIA TO NORTHERN ROCKIES BY
TUESDAY AND MORE OF THE INTERMOUNTAIN WEST WEDNESDAY, INCLUDING
HIGHER ELEVATION SNOW. SOME PRECIPITATION COULD STRETCH INTO THE
PLAINS AND MIDWEST MIDWEEK AS WELL, BUT WITH MORE UNCERTAINTY.
A WARM SUNDAY MORNING IS IN STORE FOR THE EASTERN SEABOARD BEFORE
THE COLD FRONT COMES THROUGH. THIS FRONT WILL YIELD CHILLIER
TEMPERATURES THAT ARE GENERALLY SLIGHTLY BELOW AVERAGE ACROSS PARTS
OF THE CENTRAL TO EASTERN U.S. THROUGH THE FIRST HALF OF NEXT
WEEK. ON THE OTHER HAND, THE WEST CAN EXPECT ABOVE AVERAGE
TEMPERATURES BY 10 TO 20 DEGREES UNDERNEATH UPPER RIDGING FOR THE
EARLY PART OF THE WEEK. ABOVE NORMAL TEMPERATURES SHOULD SPREAD
INTO THE HIGH PLAINS BY TUESDAY AND GRADUALLY FARTHER EAST
WEDNESDAY AND THURSDAY AS THE RIDGE PUSHES EAST, WHILE THE WEST
COAST CAN EXPECT TEMPERATURES TO COOL ONCE AGAIN.
SANTORELLI/TATE
ADDITIONAL 3-7 DAY HAZARD INFORMATION CAN BE FOUND ON THE WPC
MEDIUM RANGE HAZARDS OUTLOOK CHART AT:
HTTPS://WWW.WPC.NCEP.NOAA.GOV/THREATS/THREATS.PHP
WPC MEDIUM RANGE 500MB HEIGHTS, SURFACE SYSTEMS, WEATHER GRIDS,
QUANTITATIVE PRECIPITATION FORECAST (QPF), EXCESSIVE RAINFALL
OUTLOOK (ERO), WINTER WEATHER OUTLOOK (WWO) PROBABILITIES, HEAT
INDICES, AND KEY MESSAGES CAN BE ACCESSED FROM:
HTTPS://WWW.WPC.NCEP.NOAA.GOV/MEDR/5DAYFCST500_WBG.GIF
HTTPS://WWW.WPC.NCEP.NOAA.GOV/MEDR/5DAYFCST_WBG_CONUS.GIF
HTTPS://WWW.WPC.NCEP.NOAA.GOV/5KM_GRIDS/5KM_GRIDSBODY.HTML
HTTPS://WWW.WPC.NCEP.NOAA.GOV/QPF/DAY4-7.SHTML
HTTPS://WWW.WPC.NCEP.NOAA.GOV/#PAGE=ERO
HTTPS://WWW.WPC.NCEP.NOAA.GOV/WWD/PWPF_D47/PWPF_MEDR.PHP?DAY=4
HTTPS://WWW.WPC.NCEP.NOAA.GOV/HEAT_INDEX.SHTML
HTTPS://WWW.WPC.NCEP.NOAA.GOV/#PAGE=OVW
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