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National Weather Service
North Central River Forecast Center Twin Cities/Chanhassen MN
1130 AM CST Tue Jan 13 2009
...Mississippi River and Illinois River Ice Statement...
Ice cover conditions 01/13/09
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Mississippi River Locks and Dams
Water Upstream
L&D Temp. Cover Depth Extent Remarks
Pool (F) (%) (in) (mi)
-------------------------------------------------------------------
USAF 32 100 14 3 stationary..layered
LSAF 32 100 10 1 stopped..clear ice
1 33 100 10 6 stationary..honeycombed
2 -- ..missing.................
3 35 100 4 1 stationary..layered
4 32 100 2 4 stationary..clear ice
5 32 ..missing.................
5A 32 90 6 9 stationary..clear ice
6 32 100 10 14 stationary..layered
7 32 ..missing.................
8 -- ..missing.................
9 -- ..missing.................
10 32 100 8 30 stationary..clear ice
11 32 100 14 32 stationary..clear ice
12 32 100 10 24 stationary..clear ice
13 32 100 9 10 stationary..clear ice
14 33 100 3 1 stationary..clear ice
15 33 10 1 3 running..slush ice
16 32 100 4 20 formed locally..clear ice
17 32 90 5 5 stationary..clear ice
18 32 100 6 20 stationary..clear ice
19 32 100 5 26 stationary..clear ice
20 32 100 6 7 stationary..layered
21 32 50 3 5 running..layered
22 32 50 5 5 running..layered
24 33 10 2 10 running..breaking
25 33 40 2 1 formed locally..layered
26 -- ..missing.................
27 -- ..missing.................
Illinois River System (Chicago/Illinois R)
Water Upstream
L&D Temp. Cover Depth Extent Remarks
Pool (F) (%) (in) (mi)
-------------------------------------------------------------------
Chicago 32 ..missing.................
O'Brien 32 100 5 5 formed locally..layered
Lockport 48 --- -- --
Brandon 40 --- -- --
Dresden 35 ..missing.................
Marseilles 34 ..missing.................
Starved Rock 33 ..missing.................
Peoria 32 40 3 5 running..layered
La Grange -- ..missing.................
Data Source: http://www2.mvr.usace.army.mil/nic2/reports/icerpt.0600
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Current conditions as of January 13:
Arctic high pressure has overtaken the Upper Midwest and bitterly
cold temperatures were observed this morning...ranging from about
15 to 20 below near Minneapolis Minnesota to the mid and upper teens
above zero down south around St Louis Missouri. As of yet...river ice
conditions on the Mississippi and the Illinois have not changed too
much since last week at this time...but the surge of extremely low
temperatures expected over the next few days may have a significant
impact for the upcoming week. Please see the table above for details
of the reported conditions as of January 13.
Outlook for next 7 days:
As mentioned above...a surge of extremely cold air is pushing further
south today...and it will be reinforced by another Arctic blast
which is forecast for Wednesday into Thursday of this week.
Overnight lows for both this Wednesday and Thursday will be down
near 20 below once again in Minneapolis and only around zero
as far south as St Louis. Then...a recovery to near normal or even
a little above normal is predicted to occur by next Sunday or
Monday. Normal highs this time of year go from 21 up north in
Minneapolis Minnesota to about 37 down south in St Louis Missouri...
while lows run from about 3 to 21 respectively.
Based on these predicted air temperatures...there clearly should
be some significant new/additional ice production this week...
especially the further north you go. This somewhat quick introduction
of dramatically colder air...especially into the areas in Iowa..
Missouri..and Illinois...may have the additional complications of
producing ice jams and blockages of flow which could produce localized
flooding in areas above the jams and loss of water/flow below
the jams. The NCRFC will keep a close watch for signs of this happening
and issue forecasts as needed.
The next Ice Statement will be released on Tuesday..Jan 20 2009.
...dam...
$$
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