WINTER WEATHER ADVISORY
Issue Date: 950 PM CST WED DEC 23 2009
Expiration: 600 AM CST THU DEC 24 2009

...POTENTIALLY CRIPPLING WINTER STORM TONIGHT THROUGH FRIDAY...
.A WINTRY MIX WILL PERSIST ACROSS THE NORTHERN HALF OF IOWA
TONIGHT. THIS WILL NOT EVEN BE THE MOST SIGNIFICANT PORTION OF
THE STORM WHICH WILL OCCUR THURSDAY NIGHT THROUGH FRIDAY NIGHT
WHEN LARGE AMOUNTS OF WIND BLOWN SNOW MAY OCCUR OVER THE
NORTHWEST THIRD OF THE STATE.
IAZ037>039-047>050-241200-
/O.EXT.KDMX.WW.Y.0026.000000T0000Z-091224T1200Z/
/O.CON.KDMX.WS.A.0007.091224T1800Z-091226T0600Z/
HARDIN-GRUNDY-BLACK HAWK-BOONE-STORY-MARSHALL-TAMA-
INCLUDING THE CITIES OF...ELDORA...GRUNDY CENTER...WATERLOO...
BOONE...AMES...MARSHALLTOWN...TOLEDO
950 PM CST WED DEC 23 2009
...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 6 AM CST
THURSDAY...
...WINTER STORM WATCH REMAINS IN EFFECT FROM THURSDAY AFTERNOON
THROUGH FRIDAY EVENING...
THE WINTER WEATHER ADVISORY IS NOW IN EFFECT UNTIL 6 AM CST
THURSDAY. A WINTER STORM WATCH REMAINS IN EFFECT FROM THURSDAY
AFTERNOON THROUGH FRIDAY EVENING.
...WINTER WEATHER ADVISORY...
* SHORT TERM TRENDS...PERIODS OF FREEZING DRIZZLE TO LIGHT RAIN
WILL PERSIST THROUGH THE OVERNIGHT. TEMPERATURES WILL BE NEAR
FREEZING SO ICE ACCUMULATIONS WILL VARY WITH THE BEST THREAT OF
ACCUMULATING ICE NEAR THE HIGHWAY 20 CORRIDOR. A GRADUAL
TRANSITION TO ALL RAIN IS EXPECTED OVERNIGHT AS TEMPERATURES
EASE ABOVE FREEZING. HOWEVER...TRAVEL WILL REMAIN
HAZARDOUS...ESPECIALLY ON LESS TRAVELED ROADS.
...WINTER STORM WATCH...
* LONG TERM TRENDS...THE PRECIPITATION SHOULD SWITCH TO MAINLY
RAIN LATE TONIGHT BEFORE TRANSITIONING BACK TO A WINTRY MIX
AND EVENTUALLY ALL SNOW LATE THURSDAY. ONCE IT DOES THE SNOW
MAY BE HEAVY AND WIND BLOWN...ESPECIALLY INTO FRIDAY WHEN THE
WINDS INCREASE.
* STORM TOTAL SNOW ACCUMULATIONS...BY THE TIME THE PRECIPITATION
DIMINISHES SATURDAY...SIX TO TWELVE INCHES OF SNOW IS EXPECTED
WITH THE HIGHEST AMOUNTS OF THAT RANGE FROM NEAR BOONE TO IOWA
FALLS.
* WINDS...BRISK EAST WINDS OF 15 TO 25 MPH WILL BE COMMON TODAY
INTO THURSDAY. BY FRIDAY...WINDS WILL BECOME NORTHWEST AT 25
TO 35 MPH WITH HIGHER GUSTS.
* VISIBILITY...DURING THE PERIODS OF HEAVIER SNOW LATE THURSDAY
AND 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
ARE EXPECTED BY THAT TIME ESPECIALLY WEST OF INTERSTATE 35.
* IMPACTS...TRAVEL WILL BECOME INCREASINGLY DIFFICULT IN THE
WATCH AREA ON ON CHRISTMAS EVE NIGHT AND CHRISTMAS DAY 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 WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITY...AND USE CAUTION WHILE
DRIVING.
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.
$$

FLOOD WATCH
Issue Date: 921 PM CST WED DEC 23 2009
Expiration: 600 AM CST FRI DEC 25 2009

...FLOODING RESULTING FROM SIGNIFICANT RAINFALL...ALONG WITH SNOW
MELT AND ICE JAMS...POSSIBLE THURSDAY INTO THURSDAY NIGHT...
.A STRONG STORM SYSTEM WILL BRING THE POSSIBILITY OF FLOODING.
PRECIPITATION TYPE WILL BE A MAJOR DRIVING FORCE IN THE FLOODING
THREAT. MODERATE TO HEAVY RAIN...ALONG WITH POSSIBLE
THUNDERSTORMS...ARE POSSIBLE. RAINFALL AMOUNTS OF A HALF INCH TO
TWO INCHES ARE EXPECTED THROUGH THURSDAY NIGHT.
IAZ039-049-050-060>062-073>075-083>086-094>097-241130-
/O.CON.KDMX.FA.A.0002.091224T1200Z-091225T1200Z/
/00000.0.IC.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BLACK HAWK-MARSHALL-TAMA-POLK-JASPER-POWESHIEK-WARREN-MARION-
MAHASKA-CLARKE-LUCAS-MONROE-WAPELLO-DECATUR-WAYNE-APPANOOSE-DAVIS-
INCLUDING THE CITIES OF...WATERLOO...MARSHALLTOWN...TOLEDO...
DES MOINES...NEWTON...GRINNELL...INDIANOLA...KNOXVILLE...
OSKALOOSA...OSCEOLA...CHARITON...ALBIA...OTTUMWA...LEON...
CORYDON...CENTERVILLE...BLOOMFIELD
921 PM CST WED DEC 23 2009
...FLOOD WATCH REMAINS IN EFFECT FROM 6 AM CST THURSDAY THROUGH
LATE THURSDAY NIGHT...
THE FLOOD WATCH CONTINUES FOR
* PORTIONS OF CENTRAL IOWA...NORTHEAST IOWA...SOUTH CENTRAL IOWA
 AND SOUTHEAST IOWA...INCLUDING THE FOLLOWING AREAS...IN
 CENTRAL IOWA...JASPER...MARSHALL...POLK...POWESHIEK AND TAMA.
 IN NORTHEAST IOWA...BLACK HAWK. IN SOUTH CENTRAL IOWA...
 APPANOOSE...CLARKE...DECATUR...LUCAS...MAHASKA...MARION...
 MONROE...WARREN AND WAYNE. IN SOUTHEAST IOWA...DAVIS AND
 WAPELLO.
* FROM 6 AM CST THURSDAY THROUGH LATE THURSDAY NIGHT
* MODERATE TO HEAVY RAINFALL...AND SOME THUNDERSTORMS...ARE
 EXPECTED. THIS RAINFALL...COMBINED WITH SNOW MELT...MAY LEAD
 TO FLOODING ON AREA RIVERS. 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. 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.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON
CURRENT FORECASTS.
YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE
FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE
PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP.
&&
$$

HAZARDOUS WEATHER OUTLOOK
Issue Date: 441 PM CST WED DEC 23 2009
Expiration: 600 AM CST THU DEC 24 2009

Expires:200912241200;;
FLUS43 KDMX 232221 CCA
HWODMX
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
416 PM CST WED DEC 23 2009
IAZ039-049-050-241200-
BLACK HAWK-MARSHALL-TAMA-
416 PM CST WED DEC 23 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.
.DAY ONE...THIS AFTERNOON AND TONIGHT
A WINTER WEATHER ADVISORY IS IN EFFECT FOR THE AREA THROUGH
MIDNIGHT. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT
WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. A MIX OF
SLEET...FREEZING RAIN...AND SNOW IS EXPECTED TO CONTINUE OVER THE
AREA INTO TONIGHT...LEADING TO SOME ICE AND SNOW ACCUMULATIONS.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY
A WINTER STORM WATCH IS IN EFFECT FOR THE AREA FROM THURSDAY
AFTERNOON THROUGH FRIDAY NIGHT. PLEASE REFER TO THE NATIONAL
WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER
DETAILS.
A FLOOD WATCH IS IN EFFECT FOR THE AREA FROM THURSDAY MORNING
THROUGH THURSDAY NIGHT. PLEASE REFER TO THE NATIONAL
WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER
DETAILS.
A VERY STRONG LOW PRESSURE SYSTEM IS FORECAST TO SLOWLY APPROACH
THE STATE AND BRING A WINTRY MIX OF SNOW...SLEET...AND FREEZING
RAIN TO THE AREA LATER IN THE WEEK. THE PRECIPITATION WILL THEN
CHANGE OVER TO ALL SNOW ON THURSDAY NIGHT INTO FRIDAY MORNING AND
CONTINUE INTO THE WEEKEND. HOWEVER...HOWEVER...WARMER AIR WILL
PUSH INTO THE AREA AHEAD OF THE SURFACE LOW PRESSURE BRINGING
PERIODS OF RAIN ACROSS THE AREA THURSDAY INTO THURSDAY NIGHT. TOTAL
RAINFALL AMOUNTS OF OVER AN INCH ARE POSSIBLE. IN ADDITION...WITH
THE CURRENT SNOW PACK CONTAINING AROUND 1 TO 2 INCHES OF LIQUID
EQUIVALENT...AREAS OF FLOODING ARE POSSIBLE...ESPECIALLY AREAS
PRONE TO ICE JAMS AND RAPID RISES IN RIVER AND CREEK LEVELS.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED...BUT ANY SNOWFALL AND ICE
ACCUMULATION REPORTS ARE APPRECIATED AND ENCOURAGED.
$$

WINTER STORM WATCH
Issue Date: 507 AM CST WED DEC 23 2009
Expiration: 1200 AM CST SAT DEC 26 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 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.
IAZ037>039-047>050-057>060-070-071-231600-
/O.CAN.KDMX.ZR.Y.0001.000000T0000Z-091223T1800Z/
/O.NEW.KDMX.WW.Y.0026.091223T1107Z-091224T0600Z/
/O.EXT.KDMX.WS.A.0007.091224T1800Z-091226T0600Z/
HARDIN-GRUNDY-BLACK HAWK-BOONE-STORY-MARSHALL-TAMA-AUDUBON-
GUTHRIE-DALLAS-POLK-CASS-ADAIR-
INCLUDING THE CITIES OF...ELDORA...GRUNDY CENTER...WATERLOO...
BOONE...AMES...MARSHALLTOWN...TOLEDO...AUDUBON...GUTHRIE CENTER...
ADEL...DES MOINES...ATLANTIC...GREENFIELD
507 AM CST WED DEC 23 2009
...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT CST TONIGHT...
...WINTER STORM WATCH NOW IN EFFECT FROM THURSDAY AFTERNOON
THROUGH FRIDAY EVENING...
...FREEZING RAIN ADVISORY IS CANCELLED...
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A WINTER
WEATHER ADVISORY FOR FREEZING RAIN...SLEET OR SNOW...WHICH IS IN
EFFECT UNTIL MIDNIGHT CST TONIGHT. THE FREEZING RAIN ADVISORY HAS
BEEN CANCELED. THE WINTER STORM WATCH IS NOW IN EFFECT FROM
THURSDAY AFTERNOON THROUGH FRIDAY EVENING.
...WINTER WEATHER ADVISORY...
* SHORT TERM TRENDS...AN AREA OF SHOWERS...AND EVEN A FEW
THUNDERSTORMS...OVER KANSAS AND MISSOURI WILL ADVANCE NORTHWARD
INTO SOUTHERN IOWA THIS MORNING. AS IT DOES THE PRECIPITATION
WILL SWITCH TO A MORE WINTER VARIETY BECOMING FREEZING RAIN AND
THEN EVENTUALLY SLEET OR SNOW BY THE TIME IT HITS CENTRAL IOWA
TOWARD MIDDAY. UP TO A TENTH OF AN INCH OF ICE...AND AN INCH OR
LESS OF SNOW MAY ACCUMULATE BY THROUGH THIS EVENING.
...WINTER STORM WATCH...
* LONG TERM TRENDS...THE PRECIPITATION SHOULD SWITCH TO MAINLY
RAIN LATE TONIGHT AND EARLY THURSDAY BEFORE TRANSITIONING BACK
TO A WINTRY MIX AND EVENTUALLY ALL SNOW LATE THURSDAY. ONCE IT
DOES THE SNOW MAY BE HEAVY AND WIND BLOWN...ESPECIALLY INTO
FRIDAY WHEN THE WINDS INCREASE.
* STORM TOTAL SNOW ACCUMULATIONS...BY THE TIME THE PRECIPITATION
DIMINISHES SATURDAY...THREE TO NINE INCHES OF SNOW IS EXPECTED
WITH THE HIGHEST AMOUNTS OF THAT RANGE FROM ATLANTIC TO IOWA
FALLS.
* WINDS...BRISK EAST WINDS OF 15 TO 25 MPH WILL BE COMMON
WEDNESDAY INTO THURSDAY. BY FRIDAY...WINDS WILL BECOME
NORTHWEST AT 25 TO 35 MPH WITH HIGHER GUSTS.
* VISIBILITY...DURING THE PERIODS OF HEAVIER SNOW LATE THURSDAY AND
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 ARE
EXPECTED BY THAT TIME ESPECIALLY WEST OF INTERSTATE 35.
* IMPACTS...TRAVEL WILL BECOME INCREASINGLY DIFFICULT IN THE WATCH
AREA ON ON CHRISTMAS EVE NIGHT AND CHRISTMAS DAY 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 WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITY...AND USE CAUTION WHILE
DRIVING.
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.
$$