River Ice Statement
Issued by NWS North Central River Forecast Center

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000
FIUS43 KMSR 161612
RVIMSR

NATIONAL WEATHER SERVICE
NORTH CENTRAL RIVER FORECAST CENTER TWIN CITIES/CHANHASSEN MN
1000 AM CST TUE JAN 16 2018

...MISSISSIPPI RIVER AND ILLINOIS RIVER ICE STATEMENT...

...CORRECTED TO CHANGE LD24 TO LD27 TO LD14 TO LD27...

                ICE COVER CONDITIONS AS OF 01/16/18
*******************************************************************
MISSISSIPPI RIVER
ICE CONDITIONS ARE ABOUT THE SAME AS LAST WEEK EVEN WITH THE VERY
COLD TEMPERATURES EXPERIENCED ACROSS THE MIDWEST OVER THE PAST
FEW DAYS.

ICE WAS REPORTED ON THE MISSISSIPPI RIVER TODAY FROM LOCK AND
DAM 1 TO LD3 WITH COVERAGES OF 50 TO 90 PERCENT AND THICKNESSES
OF 3 TO 4 INCHES. LD4 TO LD12 REPORTED 90 TO 100 PERCENT ICE
COVERAGE WITH THICKNESSES OF 9 TO 15 INCHES.  LD14 TO LD27 REPORTED
30 TO 100 PERCENT COVERAGE WITH THICKNESSES OF 2 TO 8 INCHES. IT WAS
TOO CLOUDY FOR VIIRS SATELLITE IMAGERY TO DETECT ANY ICE. WEBCAMS AT
ST LOUIS AND HERMANN MISSOURI THIS MORNING STILL SHOWED ICE MOVING
THROUGH BUT TO A LESSER DEGREE THAN LAST WEEK.

ILLINOIS RIVER SYSTEM (CHICAGO/ILLINOIS R)
THE ILLINOIS RIVER WAS 60 TO 100 ICE COVERED TODAY WITH
THICKNESSES OF 3 TO 5 INCHES.  THE EXCEPTIONS WERE LOCKPORT WITH
OPEN WATER AND A WATER TEMPERATURE OF 40 DEGREES, AND BRANDON ROAD
WITH A WATER TEMPERATURE OF 36 DEGREES.  REPORTS YESTERDAY FROM
THE TRIBUTARIES INDICATED A VARIETY OF ICE CONDITIONS FROM MELTING
TO FORMING AND COVERAGES OF 10 TO 100 PERCENT. IT WAS
TOO CLOUDY FOR VIIRS SATELLITE IMAGERY TO DETECT ANY ICE.

DATA SOURCE: US ARMY CORPS OF ENGINEERS LOCK STATUS REPORT AT
 HTTP://CORPSLOCKS.USACE.ARMY.MIL/LPWB/F?P=121:4:0:::::
*******************************************************************

CURRENT CONDITIONS AS OF 01/16/2018:
SEE THE COMMENTS ABOVE FOR DETAILS.

OUTLOOK FOR NEXT 7 DAYS:
THE ROLLER COASTER OF AIR TEMPERATURES CONTINUES. BELOW NORMAL
TEMPERATURES TODAY WILL WARM UP TO ABOVE NORMAL TOMORROW AND
CONTINUE THROUGH EARLY NEXT WEEK.

IN THE NORTH...HIGHS WILL BE BELOW FREEZING THROUGH NEXT WEEK
EXCEPT IN THE 30S ON THURSDAY-SATURDAY. LOWS WILL BE -5 TO 0
TONIGHT, IN THE TEENS ON WEDNESDAY NIGHT, AND IN THE TEENS AND
20S THURSDAY NIGHT THROUGH EARLY NEXT WEEK.

IN THE SOUTH...HIGHS WILL BE IN THE TEENS TODAY, 20S TOMORROW,
AND IN THE 40S AND 50S THURSDAY THROUGH EARLY NEXT WEEK.  LOWS
WILL BE IN THE SINGLE DIGITS TONIGHT, TEENS TOMORROW NIGHT, 20S
THURSDAY NIGHT, 30S ON FRIDAY NIGHT, 40S ON SATURDAY NIGHT, AND
BACK IN THE 30S ON SUNDAY NIGHT THROUGH EARLY NEXT WEEK.

IN OUR REGION...LOW TEMPERATURES THIS MORNING WERE -5 DEGREES
IN ST CLOUD, -2 DEGREES IN THE TWIN CITIES, 0 DEGREES IN
DUBUQUE, 0 DEGREES IN MOLINE, -6 DEGREES AT LD19, -3
DEGREES IN PEORIA, AND 0 DEGREES IN ST LOUIS.

BASED ON THESE FACTORS...ICE SHOULD CONTINUE TO DEVELOP AND
THICKEN IN THE NORTH FOR THE NEXT FEW DAYS. NOT MUCH CHANGE
IS EXPECTED LATER THIS WEEK THROUGH EARLY NEXT WEEK. WE SHOULD
SEE SOME NEW ICE IN THE SOUTH TODAY AND TOMORROW AND THEN SOME
MELTING MID-WEEK THROUGH EARLY NEXT WEEK. FREEZE-UP JAMS ARE
POSSIBLE TODAY AND TOMORROW. THE RISK FOR BREAK-UP JAMS LATER
THIS WEEK THROUGH EARLY NEXT WEEK SHOULD BE LOW TO MODERATE
AS RIVER RISES DON`T APPEAR TO BE SIGNIFICANT ENOUGH TO CAUSE
THE ICE TO BREAK-UP. USUALLY A RIVER RISE OF 1.5 TO 3 TIMES THE
ICE THICKNESS IS NEEDED TO BREAK UP THE ICE.

THE NEXT ICE STATEMENT WILL BE RELEASED ON TUESDAY..JAN 23 2018.

...BSITES...

$$



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