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Valid Sunday, April 27, 2014 to Thursday, May 08, 2014

Summary of Forecasts and Hazards

US HAZARDS OUTLOOK
NWS CLIMATE PREDICTION CENTER COLLEGE PARK MD
300 PM EDT APRIL 24 2014

SYNOPSIS: AT THE START OF THE HAZARDS OUTLOOK, DEEP LOW PRESSURE OVER THE HIGH PLAINS IS EXPECTED TO MOVE SLOWLY TO THE TENNESSEE AND OHIO VALLEYS, AND THEN TOWARDS THE MID-ATLANTIC COAST. HIGH PRESSURE IS ANTICIPATED TO BUILD IN BEHIND THIS AREA OF LOW PRESSURE OVER THE WESTERN U.S. LOW PRESSURE IS FORECAST TO MOVE SOUTH OF THE ALEUTIANS TO THE GULF OF ALASKA.

HAZARDS DETAILED SUMMARY

FOR SUNDAY APRIL 27 - THURSDAY MAY 01: THERE ARE SEVERAL FLOOD-RELATED DESIGNATIONS ON THE MAP IN THE SOUTHEAST. THESE ARE GENERALLY DUE TO WET ANTECEDENT CONDITIONS. RAINFALL ANTICIPATED OVER PARTS OF THIS REGION NEXT WEEK MAY PROLONG AND EXACERBATE FLOODING CONCERNS.

THE PRIMARY FOCUS FOR HAZARDS DURING THIS PERIOD INVOLVES AN AREA OF SURFACE AND UPPER-LEVEL LOW PRESSURE FORECAST TO DEEPEN OVER THE HIGH PLAINS. THIS SYSTEM IS EXPECTED TO MOVE SLOWLY EASTWARD ACROSS THE MISSISSIPPI VALLEY TO THE OHIO AND TENNESSE VALLEYS THEN THE MID-ATLANTIC COAST. THIS LOW PRESSURE SYSTEM IS LIKELY TO BRING HEAVY RAIN (1 TO 4 INCHES) TO PARTS OF THE NORTHERN PLAINS, MISSISSIPPI VALLEY, GREAT LAKES, OHIO AND TENNESSEE VALLEYS, SOUTHERN AND CENTRAL APPALACHIANS, SOUTHEAST, AND MID-ATLANTIC APR 27-30, AND HEAVY SNOW (6-12 INCHES) TO PARTS OF THE CENTRAL ROCKIES APR 27-28. THE TIGHT PRESSURE GRADIENT BETWEEN THIS AREA OF LOW PRESSURE AND HIGH PRESSURE BUILDING OVER THE WESTERN AND CENTRAL CONUS LEADS TO HIGH WINDS (20-40 KTS OR GREATER) FOR PARTS OF THE WEST-CENTRAL, CENTRAL, AND EAST-CENTRAL CONUS APR 27-MAY 1. HIGH WINDS AND LOW RELATIVE HUMIDITY LEAD TO AN ENHANCED WILDFIRE RISK FOR PARTS OF EASTERN NEW MEXICO AND WESTERN TEXAS APR 27, AND SOUTHEASTERN NEW MEXICO AND SOUTHWESTERN TEXAS APR 28.

AS THE AREA OF LOW PRESSURE MOVES ACROSS THE PLAINS, WARM MOIST AIR IS EXPECTED TO BE DRAWN NORTHWARD FROM THE GULF OF MEXICO. THIS WILL INCREASE INSTABILITY ACROSS THE REGION AND SEVERE WEATHER IS ANTICIPATED FOR PARTS OF THE CENTRAL AND SOUTHERN PLAINS AND MIDDLE AND LOWER MISSISSIPPI VALLEYS APR 27, AND FOR PARTS OF THE SOUTHERN PLAINS, LOWER AND MIDDLE MISSISSIPPI VALLEYS, OHIO AND TENNESSEE VALLEYS, AND SOUTHEAST APR 28.

FOR FRIDAY MAY 02 - THURSDAY MAY 08: BY WEEK-2, THE GENERAL CIRCULATION PATTERN AT 500-HPA IS EXPECTED TO BE OF LOW AMPLITUDE AND FEATURES TROUGHS OVER THE EASTERN AND WESTERN U.S. AND THE ALEUTIANS, WHILE RIDGES ARE ANTICIPATED OVER THE WEST-CENTRAL CONUS AND ALASKA. NO SPECIFIC HAZARDS CAN BE DESIGNATED OVER THE CONUS WITH CONFIDENCE AT THIS RANGE, OTHER THAN CONTINUING LONG-TERM DROUGHT AREAS.

ACCORDING TO THE U.S. DROUGHT MONITOR VALID ON APRIL 22, SEVERE DROUGHT COVERAGE HAS INCREASED A PERCENTAGE POINT, FROM 25.20 PERCENT LAST WEEK (CONUS) TO 26.20 PERCENT THIS WEEK.

FLOODING IS POSSIBLE FOR PORTIONS OF THE YUKON RIVER AND PARTS OF CENTRAL ALASKA DUE TO ICE JAMS AS RIVER ICE BREAK-UP IS EXPECTED TO COMMENCE DURING THE PERIOD.

FORECASTER: RANDY SCHECHTER

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