HYDROLOGIC OUTLOOK
Issue Date: 339 PM CST TUE DEC 22 2009
Expiration: 345 AM CST WED DEC 23 2009

...FLOODING RESULTING FROM SIGNIFICANT RAINFALL...ALONG WITH
SNOW MELT AND ICE JAMS...POSSIBLE WEDNESDAY AND THURSDAY...
A STRONG WEATHER SYSTEM WILL BRING THE POSSIBILITY OF FLOODING TO
CENTRAL AND SOUTHERN IOWA THROUGH THURSDAY. THE TYPE OF
PRECIPITATION WILL BE A MAJOR DRIVING FORCE IN THE FLOODING THREAT.
THE COMBINATION OF ABOVE FREEZING TEMPERATURES...ALONG WITH
SEASONALLY MODERATE TO HEAVY RAINFALL...WILL LEAD TO A POTENTIALLY
SIGNIFICANT AMOUNT OF SNOW MELT AND RUNOFF INTO AREA STREAMS.
LOCALIZED FLOODING MAY ALSO OCCUR IN OTHER AREAS...SUCH AS URBAN
AREAS...WHERE THE DRAINAGE SYSTEMS MAY BE IMPAIRED DUE TO SNOW AND
ICE CLOGGED INTAKES.
ANOTHER CONCERN IS BREAK UP ICE JAMS ON AREA RIVERS. ESTIMATED RIVER
ICE DEPTHS RANGE FROM 2 INCHES IN SOUTHEAST IOWA...TO 6 INCHES IN
CENTRAL IOWA. THE RUNOFF WILL LIKELY BE ENOUGH TO BREAK UP THE ICE
ESPECIALLY AS ONE MOVES SOUTHWARD. SINCE THE RIVER ICE IS
RELATIVELY THIN...THOUGH...ONLY MINOR...LOCALIZED PROBLEMS DUE TO
ICE JAMS ARE EXPECTED.
RIVERS MOST LIKELY TO BE AFFECTED INCLUDE THE CHARITON...DES
MOINES RIVER FROM DES MOINES DOWNSTREAM...AS WELL AS THE SOUTH
SKUNK...CEDAR CREEK...AND THE THOMPSON RIVERS. OTHER SMALLER
STREAMS AND CREEKS MAY ALSO BE AFFECTED.
KEEP CURRENT ON THE LATEST FORECASTS...INCLUDING POSSIBLE WATCHES
AND WARNINGS.
$$
ZOGG

HAZARDOUS WEATHER OUTLOOK
Issue Date: 438 PM CST TUE DEC 22 2009
Expiration: 430 PM CST WED DEC 23 2009

Expires:200912232230;;
FLUS43 KDMX 222223
HWODMX
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
423 PM CST TUE DEC 22 2009
IAZ061-062-072>075-081>084-232230-
JASPER-POWESHIEK-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION-CLARKE-
LUCAS-
423 PM CST TUE DEC 22 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.
.DAY ONE...TONIGHT
AREAS OF FREEZING DRIZZLE WILL AFFECT MUCH OF THE AREA FROM LATER
THIS EVENING THROUGH TONIGHT AND WEDNESDAY MORNING...RESULTING IN
AROUND A TENTH OF AN INCH OF ICE ACCRUAL ON EXPOSED AND UNTREATED
SURFACES.
A FREEZING RAIN ADVISORY IS IN EFFECT FOR THE AREA THROUGH
WEDNESDAY MORNING. PLEASE REFER TO THE NATIONAL WEATHER SERVICE
WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
A MAJOR WINTER STORM WILL AFFECT THE STATE FROM WEDNESDAY THROUGH
FRIDAY. WARMER AIR IS EXPECTED TO PUSH INTO THE SOUTHERN PORTION
OF THE STATE WHICH WILL LEAD TO PRECIPITATION IN THE FORM OF RAIN
GENERALLY ALONG AND SOUTH HIGHWAY 34 FROM LATE WEDNESDAY MORNING
INTO THURSDAY. EXPECT A MIX OF SNOW...SLEET AND RAIN THURSDAY
NIGHT BEFORE SWITCHING TO ALL SNOW DURING THE OVERNIGHT HOURS
THURSDAY INTO FRIDAY. RAINFALL AMOUNTS OF 1 TO NEARLY 2 INCHES ARE
POSSIBLE WEDNESDAY INTO THURSDAY AND TEMPERATURES REMAINING IN THE
UPPER 30S TO AROUND 40. WITH THE RAINFALL AMOUNTS ON TOP OF THE
SNOW MELT...AREAS OF FLOODING ARE POSSIBLE...ESPECIALLY WITH RAPID
RISES DUE TO ICE JAMS ALONG RIVERS AND CREEKS.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED...BUT SNOWFALL AMOUNTS AND
ICE ACCUMULATION REPORTS ARE APPRECIATED AND ENCOURAGED.
$$

FREEZING RAIN ADVISORY
Issue Date: 408 PM CST TUE DEC 22 2009
Expiration: 1200 PM CST WED DEC 23 2009

...ICY CONDITIONS TONIGHT...FOLLOWED BY A MAJOR WINTER STORM
WEDNESDAY THROUGH FRIDAY...
.ICY CONDITIONS WILL AFFECT OUR REGION TONIGHT INTO WEDNESDAY.
THEN...AN APPROACHING LOW PRESSURE SYSTEM WILL BRING US RAIN AND A
MIX OF WINTRY WEATHER STATEWIDE THROUGH FRIDAY. HEAVY
PRECIPITATION IS EXPECTED AT TIMES FROM WEDNESDAY
ONWARD...FOLLOWED BY STRONG WINDS ON THURSDAY AND FRIDAY.
IAZ061-062-072>075-081>084-230615-
/O.EXB.KDMX.ZR.Y.0001.091223T0300Z-091223T1800Z/
JASPER-POWESHIEK-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION-CLARKE-
LUCAS-
INCLUDING THE CITIES OF...NEWTON...GRINNELL...WINTERSET...
INDIANOLA...KNOXVILLE...OSKALOOSA...CORNING...CRESTON...OSCEOLA...
CHARITON
408 PM CST TUE DEC 22 2009
...FREEZING RAIN ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO
NOON CST WEDNESDAY...
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FREEZING
RAIN ADVISORY...WHICH IS IN EFFECT FROM 9 PM THIS EVENING TO NOON
CST WEDNESDAY.
...FREEZING RAIN ADVISORY...
* TIMING...FREEZING DRIZZLE WILL SPREAD SOUTHWARD WITH
TIME...INTO CENTRAL AND SOUTHERN IOWA BY LATE THIS EVENING.
* TOTAL ICE ACCUMULATIONS...AROUND A TENTH OF AN INCH OF ICE
ACCUMULATION IS EXPECTED THROUGH MIDDAY WEDNESDAY.
* VISIBILITY...THE FREEZING DRIZZLE WILL COMBINE WITH AREAS OF
FOG TO REDUCE VISIBILITIES TO LESS THAN ONE MILE IN AREAS.
* IMPACTS...TRAVEL WILL BE HAZARDOUS WITH AREAS OF BLACK ICE...
ESPECIALLY ON LESS TREATED ROADS. IT WILL TAKE ONLY VERY MINOR
ICE ACCUMULATIONS TO CAUSE TRAVEL DIFFICULTIES. IN ADDITION...
THE ICE CAN BE DIFFICULT TO SEE ON THE ROAD...SO A ROAD THAT
APPEARS TO BE CLEAR MAY ACTUALLY BE ICY.
...WINTER STORM WATCH...
* TIMING...ALTHOUGH FREEZING DRIZZLE OR LIGHT FREEZING RAIN MAY
OCCUR THROUGH TONIGHT AND WEDNESDAY MORNING...THE MOST
SIGNIFICANT IMPACTS WITH THIS STORM SHOULD OCCUR FROM WEDNESDAY
AFTERNOON THROUGH FRIDAY.
* STORM TOTAL ICE ACCUMULATIONS...ICING OF UP TO ONE QUARTER OF AN
INCH IS EXPECTED NEAR THE INTERSTATE 80 CORRIDOR THROUGH
THURSDAY...WITH LESSER AMOUNTS TO THE SOUTH.
* STORM TOTAL SNOW ACCUMULATIONS...THE PRECIPITATION SHOULD
BECOME PRIMARILY SNOW LATE THURSDAY INTO FRIDAY WITH TOTAL
ACCUMULATIONS BY THE END OF THE STORM FROM 2 TO 6 INCHES FROM
ATLANTIC...DES MOINES AND GRINNELL...UP TO OVER A FOOT ALONG AND
WEST OF A DENISON...TO FORT DODGE...TO MASON CITY LINE.
* WINDS...BRISK EAST WINDS OF 15 TO 25 MPH WILL BE IN PLACE
THROUGH MUCH OF WEDNESDAY AND THURSDAY BEFORE INCREASING EVEN
FURTHER BY FRIDAY AND TURNING AROUND TO NORTH AND NORTHWEST.
WINDS BY THAT TIME MAY BE SUSTAINED AT 25 TO 35 MPH WITH GUSTS
EVEN HIGHER.
* VISIBILITY...DURING THE PERIODS OF HEAVY SNOW THURSDAY INTO
FRIDAY...VISIBILITIES WILL GENERALLY BE LESS THAN ONE MILE AND
EVEN DOWN TO A QUARTER MILE DURING THE HEAVIEST SNOWS. WITH
INCREASING WINDS AND SNOW COINCIDENT BY FRIDAY...BLOWING SNOW
AND GREATLY REDUCED VISIBILITIES NEAR BLIZZARD CONDITIONS WILL
BE POSSIBLE BY THAT TIME.
* IMPACTS...TRAVEL WILL BECOME INCREASINGLY DIFFICULT IN THE
WATCH AREA ON WEDNESDAY DURING THE WINTRY MIX OF PRECIPITATION
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.
A FREEZING RAIN ADVISORY MEANS THAT PERIODS OF FREEZING RAIN OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS. SLOW DOWN AND USE CAUTION WHILE DRIVING.
$$