Severe Thunderstorms and Possible Flooding Through This Weekend in the Central U.S.

Severe thunderstorms are forecast through this weekend along a slow moving cold front and secondary storm system that will impact areas from the southern Plains to the Great Lakes. Large hail and isolated damaging wind gusts are the main threats with these storms along with a risk for heavy to excessive rainfall which could bring flooding. Read More >

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Forecast Format

Example from 1975

Example from 2010

Gridded Forecasts

Forecast Example from 1975

24 hour time frame

One Synopsis for entire Great Lakes region

Details at a minimum

WEATHER SYNOPSIS FOR GREAT LAKES
FORECAST POSITIONS FOR 1 AM EST MONDAY...DEEPENING LOW CENTER 29.25 INCHES EXTREME SOUTHEAST MINNESOTA WITH COLD FRONT AND WINDSHIFT LINE SOUTHWARD TO SOUTHEAST MISSOURI. LOW MOVING NORTH-NORTHEASTWARD TO ABOUT 200 MILES NORTH OF EASTERN LAKE SUPERIOR WITH COLD FRONT AND WINDSHIFT LINE IN ARC TO EASTERN NEW YORK TO WEST VIRGINIA MIDNIGHT MONDAY.

OUTLOOK...DEEP LOW MOVING TO EAST OF JAMES BAY. WEAK RIDGE MOVING FROM NORTHERN PLAINS STATES TO UPPER AND MID MISSISSIPPI VALLEY.

LAKE SUPERIOR
GALE WARNINGS IN EFFECT
WEST HALF...
EAST TO NORTHEAST WINDS 28 TO 40 KNOTS INCREASING TO 35 TO 45 KNOTS THE REMAINDER OF TONIGHT BECOMING NORTH TO NORTHWEST 35 TO 45 KNOTS MONDAY. RAIN MIXED WITH SNOW AT TIMES. SOME THUNDERSTORMS. WAVES 5 TO 10 FEET INCREASING TO 8 TO 15 FEET OVERNIGHT.

EAST HALF...
EASTERLY WINDS 32 TO 42 KNOTS BECOMING NORTHEASTERLY MONDAY MORNING AND WEST TO SOUTHWEST 35 TO 45 KNOTS MONDAY AFTERNOON. RAIN AND THUNDERSTORMS. WAVES 5 TO 10 FEET INCREASING TO 8 TO 15 FEET MONDAY.

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Severe Thunderstorms and Possible Flooding Through This Weekend in the Central U.S.

Advances in Observations and Forecasts

Forecast Example from 1975