HYDROLOGIC OUTLOOK
Issue Date: 529 AM CST WED DEC 23 2009
Expiration: 530 PM CST WED DEC 23 2009 ...FLOODING RESULTING FROM SIGNIFICANT RAINFALL...ALONG WITH
SNOW MELT AND ICE JAMS...POSSIBLE WEDNESDAY AND THURSDAY...
A PRODIGIOUS LOW PRESSURE SYSTEM WILL BRING THE POSSIBILITY OF
FLOODING TO CENTRAL AND ESPECIALLY SOUTHERN IOWA THROUGH THURSDAY
EVENING. PRECIPITATION TYPE WILL BE A MAJOR DRIVING FORCE IN THE
FLOODING THREAT. AREAS OF FREEZING RAIN AND DRIZZLE ARE POSSIBLE
TODAY AND TONIGHT OVER CENTRAL PORTIONS OF THE AREA...WITH
GENERALLY RAIN AND ISOLATED THUNDERSTORMS EXPECTED OVER FAR
SOUTHERN IOWA. RAINFALL AMOUNTS OF A HALF INCH TO NEARLY TWO
INCHES ARE ANTICIPATED THROUGH THURSDAY NIGHT.
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.
$$
PODRAZIK/ZOGG
HAZARDOUS WEATHER OUTLOOK
Issue Date: 529 AM CST WED DEC 23 2009
Expiration: 530 AM CST THU DEC 24 2009 Expires:200912241130;;
FLUS43 KDMX 231122
HWODMX
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
522 AM CST WED DEC 23 2009
IAZ037>039-047>050-057>060-070>072-241130-
HARDIN-GRUNDY-BLACK HAWK-BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-
DALLAS-POLK-CASS-ADAIR-MADISON-
522 AM CST WED DEC 23 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.
.DAY ONE...TODAY AND TONIGHT
A WINTER WEATHER ADVISORY IS IN EFFECT FOR THE AREA THROUGH
TONIGHT. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT
WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. A MIX OF
SLEET...FREEZING...AND POSSIBLY SNOW IS EXPECTED TO DEVELOP OVER
THE AREA TODAY AND TONIGHT...LEADING TO SOME ICE AND SNOW
ACCUMULATIONS.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY
A WINTER STORM WATCH IS IN EFFECT FOR THE AREA FROM THURSDAY
AFTERNOON THROUGH FRIDAY NIGHT. PLEASE REFER TO THE NATIONAL
WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER
DETAILS.
A VERY STRONG LOW PRESSURE SYSTEM IS FORECAST TO SLOWLY APPROACH
THE STATE AND BRING A WINTRY MIX OF SNOW...SLEET...AND FREEZING
RAIN TO THE AREA BY THURSDAY AFTERNOON. THURSDAY NIGHT INTO FRIDAY
MORNING...LOOK FOR THE PRECIPITATION TO CHANGE OVER TO ALL SNOW.
MODERATE SNOW AND ICE ACCUMULATIONS ARE POSSIBLE.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED...BUT ANY SNOWFALL AND ICE
ACCUMULATION REPORTS ARE APPRECIATED AND ENCOURAGED.
AN EMERGENCY MANAGER CONFERENCE CALL IS SCHEDULED AT 11AM CST
WEDNESDAY MORNING.
$$
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.
$$
WINTER WEATHER ADVISORY
Issue Date: 507 AM CST WED DEC 23 2009
Expiration: 1200 AM CST THU DEC 24 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.
$$
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