HYDROLOGIC OUTLOOK
Issue Date: 601 AM CST TUE DEC 22 2009
Expiration: 615 PM CST TUE DEC 22 2009

...SIGNIFICANT RAINFALL AND SNOW MELT POSSIBLE WEDNESDAY AND
THURSDAY...
A LARGE SWATH OF MOISTURE IS FORECAST TO PUSH INTO THE STATE
THROUGH THURSDAY...ALONG WITH TEMPERATURES ABOVE FREEZING. LOOK
FOR RAIN TO DEVELOP...GENERALLY ALONG AND SOUTH OF INTERSTATE
80...BY WEDNESDAY MORNING AND IS FORECAST TO CONTINUE THROUGH
THURSDAY. THERE WILL BE PERIODS OF FREEZING RAIN IN SOME AREAS
ALONG THE CORRIDOR OF INTERSTATE 80 DURING THE MORNING HOURS
WEDNESDAY BEFORE SWITCHING TO ALL RAIN BY WEDNESDAY AFTERNOON.
RAINFALL AMOUNTS OF THREE-QUARTERS OF AN INCH TO AN INCH AND A
HALF ARE ANTICIPATED WITH THIS SYSTEM BY THURSDAY. IN
ADDITION...THE CURRENT SNOW PACK CONTAINS AROUND ONE INCH TO AN
INCH AND A HALF OF LIQUID EQUIVALENT...LEADING TO THE POTENTIAL
FOR SIGNIFICANT RUNOFF FROM RAINFALL AND SNOW MELT.
HIGH TEMPERATURES ARE EXPECTED TO BE IN THE MIDDLE TO UPPER 30S
ACROSS CENTRAL TO SOUTHERN...WITH TEMPERATURES ANTICIPATED TO
REMAIN STEADY OR SLOWLY RISING INTO THE LOWER 40S DURING THE
OVERNIGHT HOURS WEDNESDAY INTO THURSDAY. AS A RESULT...A PROLONG
PERIOD OF TEMPERATURES ABOVE FREEZING WILL RESULT IN A SIGNIFICANT
AMOUNT OF SNOW MELT DURING THE TIME FRAME.
AREA STREAMS AND RIVERS ACROSS THE SOUTHERN HALF OF IOWA WILL
LIKELY EXPERIENCE LARGE RISES DUE TO THE COMBINATION OF RAINFALL
AND SNOW MELT BY THURSDAY AND RIVER FLOODING MAY BECOME
PROBLEMATIC. BASINS WHICH APPEAR MOST LIKELY TO BE AFFECTED
INCLUDE THE CHARITON...LOWER DES MOINES...SOUTH SKUNK...CEDAR
CREEK...AND THE THOMPSON RIVERS ACROSS THE SOUTHERN HALF OF
CENTRAL IOWA.
$$
PODRAZIK/COGIL

HAZARDOUS WEATHER OUTLOOK
Issue Date: 535 AM CST TUE DEC 22 2009
Expiration: 530 AM CST WED DEC 23 2009

Expires:200912231130;;
FLUS43 KDMX 221134
HWODMX
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
520 AM CST TUE DEC 22 2009
IAZ004>007-015>017-023>028-033>039-044>050-057>060-070-071-231130-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE-
BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK-CASS-ADAIR-
520 AM CST TUE DEC 22 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.
.DAY ONE...TODAY AND TONIGHT
AREAS OF FREEZING DRIZZLE WILL AFFECT MUCH OF THE AREA TODAY AND
TONIGHT...LEADING TO A LIGHT GLAZE OF ICE ACCRUAL BY THIS EVENING.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
A MAJOR WINTER STORM IS EXPECTED TO BRING THE POTENTIAL FOR ICE
ACCUMULATIONS WEDNESDAY INTO THURSDAY...THEN CHANGING TO SNOW
THURSDAY NIGHT INTO FRIDAY. A WINTER STORM WATCH IS IN EFFECT FOR
THE AREA FROM WEDNESDAY MORNING THROUGH FRIDAY AFTERNOON. PLEASE
REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT
WEATHER.GOV/DESMOINES FOR FURTHER DETAILS.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED...BUT SNOWFALL AMOUNTS AND
ICE ACCUMULATION REPORTS ARE APPRECIATED AND ENCOURAGED.
EMERGENCY MANAGER CONFERENCE CALL TENTATIVELY SCHEDULED AT 11AM CST.
$$

WINTER STORM WATCH
Issue Date: 344 PM CST MON DEC 21 2009
Expiration: 600 PM CST FRI DEC 25 2009

...MAJOR WINTER STORMS SET TO IMPACT PORTIONS OF IOWA WEDNESDAY
THROUGH FRIDAY...
.LOW PRESSURE WILL MOVE THROUGH IOWA TONIGHT BRINGING SNOW ACROSS
THE NORTHERN HALF OF THE STATE. A MUCH MORE INTENSE SYSTEM IS
FORECAST TO LIFT INTO THE MIDWEST ON WEDNESDAY AND MEANDER SLOWLY
NORTH INTO THURSDAY AND FRIDAY BRINGING SEVERE WINTER WEATHER
CONDITIONS TO PORTIONS OF CENTRAL IOWA.
IAZ023>025-033>039-044>050-057>060-070-071-220500-
/O.NEW.KDMX.WS.A.0007.091223T1200Z-091226T0000Z/
POCAHONTAS-HUMBOLDT-WRIGHT-SAC-CALHOUN-WEBSTER-HAMILTON-HARDIN-
GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE-BOONE-STORY-MARSHALL-
TAMA-AUDUBON-GUTHRIE-DALLAS-POLK-CASS-ADAIR-
INCLUDING THE CITIES OF...POCAHONTAS...HUMBOLDT...CLARION...
SAC CITY...ROCKWELL CITY...FORT DODGE...WEBSTER CITY...ELDORA...
GRUNDY CENTER...WATERLOO...DENISON...CARROLL...JEFFERSON...
BOONE...AMES...MARSHALLTOWN...TOLEDO...AUDUBON...GUTHRIE CENTER...
ADEL...DES MOINES...ATLANTIC...GREENFIELD
344 PM CST MON DEC 21 2009
...WINTER STORM WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH
FRIDAY AFTERNOON...
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A WINTER
STORM WATCH...WHICH IS IN EFFECT FROM WEDNESDAY MORNING THROUGH
FRIDAY AFTERNOON.
* TIMING...WEDNESDAY MORNING THROUGH LATE FRIDAY AFTERNOON.
* STORM TOTAL ICE ACCUMULATIONS...UP TO ONE QUARTER INCH FROM THE
HIGHWAY 30 TO HIGHWAY 20 CORRIDORS WITH LESSER AMOUNTS FARTHER
NORTH.
* STORM TOTAL SNOW ACCUMULATIONS...4 TO 6 INCHES ALONG THE
SOUTHERN EDGE OF THE WATCH AREA UP TO OVER A FOOT ALONG AND WEST
OF A CARROLL TO MASON CITY LINE.
* WINDS...EASTERLY WINDS AT 10 TO 20 MPH ON WEDNESDAY INTO
THURSDAY BECOMING NORTHERLY AT 20 TO 30 MPH WITH HIGHER GUSTS ON
FRIDAY.
* VISIBILITY...SNOW AREAS WILL SEE VISIBILITIES GENERALLY LESS
THAN ONE MILE FOR THE DURATION OF THE STORM WITH FREQUENT
VISIBILITIES OF ONE HALF TO ONE QUARTER OF A MILE IN THE HEAVIER
SNOWS. WITH INCREASING WINDS THURSDAY NIGHT AND FRIDAY...BLOWING
SNOW AND REDUCED VISIBILITIES ARE EXPECTED IN THE WATCH AREA.
* IMPACTS...TRAVEL WILL BECOME INCREASINGLY DIFFICULT IN THE WATCH
AREA ON WEDNESDAY AND CONTINUE TO BE DIFFICULT INTO THURSDAY AND
FRIDAY AS SNOW ACCUMULATES AND WINDS INCREASE. IN THE HEAVIEST
SNOW AREAS...TRAVEL MAY BECOME NEARLY IMPOSSIBLE DUE TO BLOWING
AND DRIFTING SNOW THURSDAY NIGHT INTO FRIDAY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL.
CONTINUE TO MONITOR THE LATEST FORECASTS.
$$
COGIL