Alert archive / Iowa / Winter Storm Warnings in 2011

Winter Storm Warning 1, NWS Quad Cities, IA

February 24, 20115 counties in Iowa; 4 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this winter storm warning at Feb 24, 2011, 3:20 AM CST for 5 counties in Iowa; 4 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Feb 24, 2011, 4:00 PM CST. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Feb 24, 2011, 3:20 AM CST (09:20 UTC)
In effect from
Feb 24, 2011, 4:00 PM CST
Expired
Feb 24, 2011, 8:49 PM CST
In force
5 hr
Issued by
NWS Quad Cities, IA

Counties Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Van Buren County, IA, Hancock County, IL, Henderson County, IL, McDonough County, IL, Warren County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 122 km from the middle of the area, began a volume at 09:18 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 9.3 hours before the alert went out and 127 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2011-02-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2011-02-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 330 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
671 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
330 m²/s²
0-3 km storm-relative helicity
336 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

701 
WWUS43 KDVN 240920
WSWDVN

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
320 AM CST THU FEB 24 2011

...WINTER STORM ON THE WAY...

..A WINTER STORM WILL BRING MODERATE TO HEAVY SNOW TO THE AREA FROM
LATE AFTERNOON THROUGH TONIGHT. SNOW WILL SPREAD NORTHEAST OVER
THE REGION TODAY...REACHING AREAS ALONG AND SOUTH OF HIGHWAY 34 BY
LATE AFTERNOON. THIS SNOW WILL REACH INTERSTATE 80 CORRIDOR
COUNTIES BY EARLY EVENING...AND AREAS FARTHER NORTH BY 8 PM. SNOW
AMOUNT OF 5 TO 7 INCHES ARE EXPECTED ALONG AND SOUTH OF HIGHWAY
34...WITH AMOUNTS OF 3 TO 5 INCHES WIDESPREAD THROUGH AN IOWA CITY
TO CLINTON...TO MOUNT CARROLL LINE. THE EXACT TRACK OF THIS STORM
IS STILL A BIT UNCERTAIN...AND DUE TO THAT THERE IS THE
POSSIBILITY OF A FEW BANDS OF HIGHER AMOUNTS. WIND WILL INCREASE
TO 15 TO 20 MPH TONIGHT...RESULTING IN SIGNIFICANT DRIFTING OF
THE SNOW. 

IAZ089-098-099-ILZ025-026-034-035-MOZ009-010-241930-
/O.NEW.KDVN.WS.W.0001.110224T2200Z-110225T1200Z/
DES MOINES-VAN BUREN-LEE-HENDERSON-WARREN-HANCOCK-MCDONOUGH-
SCOTLAND-CLARK-
INCLUDING THE CITIES OF...BURLINGTON...KEOSAUQUA....
FORT MADISON...OQUAWKA...MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...
KAHOKA
320 AM CST THU FEB 24 2011

...WINTER STORM WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO
6 AM CST FRIDAY...

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A
WINTER STORM WARNING FOR HEAVY SNOW...WHICH IS IN
EFFECT FROM 4 PM THIS AFTERNOON TO 6 AM CST FRIDAY. 


* SNOW WILL BEGIN LATE THIS AFTERNOON...AND WILL CONTINUE TO FALL
  THROUGH TONIGHT.

* SNOWFALL OF 5 TO 7 INCHES IS LIKELY...WITH ISOLATED HIGHER
  AMOUNTS POSSIBLE.

* WINDS WILL INCREASE TO 15 TO 20 MPH. 

* VISIBILITY WILL BE RESTRICTED TO UNDER 1/2 MILE AT TIMES DUE TO
  MODERATE TO HEAVY SNOW.

* THE MAIN IMPACT WILL BE HEAVY SNOW FALL...WITH THE WIND CAUSING
  SOME SIGNIFICANT DRIFTING OF THE SNOW OVERNIGHT.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS 6 TO 7 INCHES OR MORE
OF SNOW IS EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY
DANGEROUS...SO ONLY TRAVEL IN AN EMERGENCY AND TAKE YOUR WINTER
SURVIVAL KIT.

&&

$$

IAZ063>068-076>078-087-088-ILZ007-009-015>018-024-241930-
/O.NEW.KDVN.WW.Y.0005.110225T0000Z-110225T1200Z/
IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-
LOUISA-JEFFERSON-HENRY IA-CARROLL-WHITESIDE-ROCK ISLAND-HENRY IL-
BUREAU-PUTNAM-MERCER-
INCLUDING THE CITIES OF...MARENGO...IOWA CITY...TIPTON...
CLINTON...MUSCATINE...BETTENDORF...DAVENPORT...SIGOURNEY...
WASHINGTON...WAPELLO...FAIRFIELD...MOUNT PLEASANT...
MOUNT CARROLL...STERLING...ROCK FALLS...MOLINE...ROCK ISLAND...
KEWANEE...PRINCETON...HENNEPIN...ALEDO
320 AM CST THU FEB 24 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
6 AM CST FRIDAY...

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A
WINTER WEATHER ADVISORY FOR SIGNIFICANT SNOW AND DRIFTING...WHICH
IS IN EFFECT FROM 6 PM THIS EVENING TO 6 AM CST FRIDAY.

* SNOW WILL BEGIN LATE THIS AFTERNOON...AND WILL CONTINUE TO FALL
  THROUGH TONIGHT.

* SNOWFALL OF 3 TO 5 INCHES IS LIKELY...WITH ISOLATED HIGHER
  AMOUNTS POSSIBLE.

* WINDS WILL INCREASE TO 15 TO 20 MPH. 

* VISIBILITY WILL BE RESTRICTED TO UNDER 1/2 MILE AT TIMES DUE TO
  MODERATE TO HEAVY SNOW.

* THE MAIN IMPACT WILL BE SIGNIFICANT SNOW FALL...WITH THE WIND CAUSING
  SOME SIGNIFICANT DRIFTING OF THE SNOW OVERNIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL
CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLICK...SNOW COVERED
ROADS AND LIMITED VISIBILITIES...AND BE CAREFUL WHILE DRIVING.

&&

$$


ERVIN
4 follow-up statements
889 
WWUS43 KDVN 241608
WSWDVN

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1008 AM CST THU FEB 24 2011

...SIGNIFICANT WINTER STORM ON THE WAY...

..A WINTER STORM WILL BRING MODERATE TO HEAVY SNOW TO THE AREA
FROM LATE AFTERNOON THROUGH TONIGHT. SNOW WILL SPREAD NORTHEAST
OVER THE REGION TODAY...REACHING AREAS ALONG AND SOUTH OF HIGHWAY
34 BY LATE AFTERNOON. THIS SNOW WILL REACH INTERSTATE 80 CORRIDOR
COUNTIES BY EARLY EVENING...AND AREAS FARTHER NORTH BY 8 PM. SNOW
AMOUNTS OF ABOUT 6 TO 10 INCHES ARE EXPECTED ALONG AND SOUTH OF
HIGHWAY 34...WITH AMOUNTS OF 3 TO 6 INCHES FROM ABOUT HIGHWAY 30
SOUTH TO NEAR HIGHWAY 34. ONLY ABOUT 1 TO 3 INCHES IS EXPECTED
NORTH OF HIGHWAY 30. WIND WILL INCREASE TO 15 TO 25 MPH TONIGHT...
RESULTING IN SIGNIFICANT DRIFTING AND SOME BLOWING OF THE SNOW.

IAZ089-098-099-ILZ025-026-034-035-MOZ009-010-250215-
/O.CON.KDVN.WS.W.0001.110224T2200Z-110225T1200Z/
DES MOINES-VAN BUREN-LEE-HENDERSON-WARREN-HANCOCK-MCDONOUGH-
SCOTLAND-CLARK-
INCLUDING THE CITIES OF...BURLINGTON...KEOSAUQUA....
FORT MADISON...OQUAWKA...MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...
KAHOKA
1008 AM CST THU FEB 24 2011

...WINTER STORM WARNING REMAINS IN EFFECT FROM 4 PM THIS
AFTERNOON TO 6 AM CST FRIDAY...

A WINTER STORM WARNING REMAINS IN EFFECT FROM 4 PM THIS AFTERNOON
TO 6 AM CST FRIDAY. 

* SNOW WILL BEGIN LATE THIS AFTERNOON...AND WILL CONTINUE THROUGH
  TONIGHT. SNOW WILL BE HEAVY AT TIMES ESPECIALLY THIS EVENING.
  THUNDER AND LIGHTNING ARE ALSO POSSIBLE.

* SNOWFALL OF 6 TO 10 INCHES IS LIKELY.

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* VISIBILITY WILL BE RESTRICTED TO UNDER 1/2 MILE AT TIMES DUE 
  TO MODERATE TO HEAVY SNOW. 

* THE MAIN IMPACT WILL BE HEAVY SNOW...WITH THE WIND CAUSING SOME
  SIGNIFICANT DRIFTING AND SOME BLOWING OF THE SNOW OVERNIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS 6 INCHES OR MORE OF
SNOW IS EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY
DANGEROUS...SO ONLY TRAVEL IN AN EMERGENCY AND TAKE YOUR WINTER
SURVIVAL KIT.

&&

$$

IAZ063>068-076>078-087-088-ILZ007-009-015>018-024-250215-
/O.CON.KDVN.WW.Y.0005.110225T0000Z-110225T1200Z/
IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-
LOUISA-JEFFERSON-HENRY IA-CARROLL-WHITESIDE-ROCK ISLAND-HENRY IL-
BUREAU-PUTNAM-MERCER-
INCLUDING THE CITIES OF...MARENGO...IOWA CITY...TIPTON...
CLINTON...MUSCATINE...BETTENDORF...DAVENPORT...SIGOURNEY...
WASHINGTON...WAPELLO...FAIRFIELD...MOUNT PLEASANT...
MOUNT CARROLL...STERLING...ROCK FALLS...MOLINE...ROCK ISLAND...
KEWANEE...PRINCETON...HENNEPIN...ALEDO
1008 AM CST THU FEB 24 2011

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO 6 AM CST FRIDAY...

A WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO 6 AM CST FRIDAY. 

* SNOW WILL BEGIN LATE THIS AFTERNOON OR EARLY THIS EVENING...AND
  WILL CONTINUE TO FALL THROUGH TONIGHT.

* SNOWFALL OF 3 TO 6 INCHES IS LIKELY.

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* VISIBILITY WILL BE RESTRICTED TO UNDER 1/2 MILE AT TIMES DUE 
  TO MODERATE TO HEAVY SNOW. 

* THE MAIN IMPACT WILL BE SIGNIFICANT SNOW...WITH THE WIND
  CAUSING SOME SIGNIFICANT DRIFTING AND SOME BLOWING OF THE SNOW
  OVERNIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLICK...SNOW
COVERED ROADS AND LIMITED VISIBILITIES...AND BE CAREFUL WHILE
DRIVING.

&&

$$

HAASE
808 
WWUS43 KDVN 242059
WSWDVN

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
259 PM CST THU FEB 24 2011

...SIGNIFICANT WINTER STORM BEARING DOWN ON THE REGION...

.A SIGNIFICANT WINTER STORM WILL BRING MODERATE TO HEAVY SNOW TO
THE AREA FROM LATE THIS AFTERNOON INTO TONIGHT. HOWEVER ONLY LIGHT
SNOW IS EXPECTED NORTH OF HIGHWAY 30. SNOW WILL SPREAD NORTHEAST
OVER THE REGION BY LATE THIS AFTERNOON OR EARLY THIS EVENING...
REACHING AREAS NORTH OF HIGHWAY 30 AFTER 8 PM. SNOW AMOUNTS OF
ABOUT 6 TO 10 INCHES ARE EXPECTED ALONG AND SOUTH OF HIGHWAY
34...WITH AMOUNTS OF 3 TO 6 INCHES FROM ABOUT HIGHWAY 30 SOUTH TO
NEAR HIGHWAY 34. ONLY ABOUT 1 TO 3 INCHES IS EXPECTED NORTH OF
HIGHWAY 30. WIND WILL INCREASE TO 15 TO 25 MPH TONIGHT...RESULTING
IN SIGNIFICANT DRIFTING AND SOME BLOWING OF THE SNOW.

IAZ087-088-250700-
/O.UPG.KDVN.WW.Y.0005.110225T0000Z-110225T1200Z/
/O.EXA.KDVN.WS.W.0001.110224T2200Z-110225T1200Z/
JEFFERSON-HENRY IA-
INCLUDING THE CITIES OF...FAIRFIELD...MOUNT PLEASANT
259 PM CST THU FEB 24 2011

...WINTER STORM WARNING IN EFFECT UNTIL 6 AM CST FRIDAY...

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A
WINTER STORM WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT UNTIL 6 AM CST
FRIDAY. THE WINTER WEATHER ADVISORY IS NO LONGER IN EFFECT.

* SNOW WILL BEGIN LATE THIS AFTERNOON AND WILL CONTINUE TO FALL
  THROUGH TONIGHT.

* SNOWFALL OF 6 TO 8 INCHES IS LIKELY.

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* VISIBILITY WILL BE RESTRICTED TO UNDER 1/2 MILE AT TIMES DUE 
  TO MODERATE TO HEAVY SNOW. 

* THE MAIN IMPACT WILL BE SIGNIFICANT SNOW...WITH THE WIND 
  CAUSING SOME SIGNIFICANT DRIFTING AND SOME BLOWING OF THE SNOW 
  OVERNIGHT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS 6 INCHES OR MORE OF
SNOW IS EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY
DANGEROUS...SO ONLY TRAVEL IN AN EMERGENCY AND TAKE YOUR WINTER
SURVIVAL KIT.

&&

$$

IAZ089-098-099-ILZ025-026-034-035-MOZ009-010-250700-
/O.CON.KDVN.WS.W.0001.110224T2200Z-110225T1200Z/
DES MOINES-VAN BUREN-LEE-HENDERSON-WARREN-HANCOCK-MCDONOUGH-
SCOTLAND-CLARK-
INCLUDING THE CITIES OF...BURLINGTON...KEOSAUQUA....
FORT MADISON...OQUAWKA...MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...
KAHOKA
259 PM CST THU FEB 24 2011

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM CST FRIDAY...

A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM CST FRIDAY. 

* SNOW WILL BEGIN LATE THIS AFTERNOON...AND WILL CONTINUE 
  THROUGH TONIGHT. SNOW WILL BE HEAVY AT TIMES ESPECIALLY THIS 
  EVENING. THUNDER AND LIGHTNING ARE ALSO POSSIBLE. 

* SNOWFALL OF 6 TO 10 INCHES IS LIKELY.

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* VISIBILITY WILL BE RESTRICTED TO UNDER 1/2 MILE AT TIMES DUE 
  TO MODERATE TO HEAVY SNOW. 

* THE MAIN IMPACT WILL BE HEAVY SNOW...WITH THE WIND CAUSING 
  SOME SIGNIFICANT DRIFTING AND SOME BLOWING OF THE SNOW 
  OVERNIGHT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS 6 INCHES OR MORE OF
SNOW IS EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY
DANGEROUS...SO ONLY TRAVEL IN AN EMERGENCY AND TAKE YOUR WINTER
SURVIVAL KIT.

&&

$$

IAZ063>068-076>078-ILZ007-009-015>018-024-250700-
/O.CON.KDVN.WW.Y.0005.110225T0000Z-110225T1200Z/
IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-
LOUISA-CARROLL-WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-
MERCER-
INCLUDING THE CITIES OF...MARENGO...IOWA CITY...TIPTON...
CLINTON...MUSCATINE...BETTENDORF...DAVENPORT...SIGOURNEY...
WASHINGTON...WAPELLO...MOUNT CARROLL...STERLING...ROCK FALLS...
MOLINE...ROCK ISLAND...KEWANEE...PRINCETON...HENNEPIN...ALEDO
259 PM CST THU FEB 24 2011

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO 6 AM CST FRIDAY...

A WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO 6 AM CST FRIDAY. 

* SNOW WILL BEGIN LATE THIS AFTERNOON OR EARLY THIS EVENING...
  AND WILL CONTINUE TO FALL THROUGH TONIGHT. 

* SNOWFALL OF 3 TO 6 INCHES IS LIKELY.

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* VISIBILITY WILL BE RESTRICTED TO UNDER 1/2 MILE AT TIMES DUE 
  TO MODERATE TO HEAVY SNOW. 

* THE MAIN IMPACT WILL BE SIGNIFICANT SNOW...WITH THE WIND 
  CAUSING SOME SIGNIFICANT DRIFTING AND SOME BLOWING OF THE SNOW 
  OVERNIGHT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLICK...SNOW
COVERED ROADS AND LIMITED VISIBILITIES...AND BE CAREFUL WHILE
DRIVING.

&&

$$

HAASE
180 
WWUS43 KDVN 250100
WSWDVN

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
700 PM CST THU FEB 24 2011

...ACCUMULATING SNOW DEVELOPING TONIGHT...

.A WINTER STORM WILL BRING SNOW TO THE AREA TONIGHT. DRIER AIR
ON LOW LEVEL NORTHEAST WINDS HAS HELD THE SNOW AT BAY FOR 
THE TIME BEING FOR NEARLY ALL BUT PORTIONS OF EAST CENTRAL AND
SOUTHEAST IOWA... AND NORTHEAST MISSOURI. IN ADDITION... THE
MAIN SURGE OF MOISTURE WITH THIS STORM CONTINUES SLIDING EASTWARD
THROUGH SOUTHERN ILLINOIS... AND AWAY FROM THE REGION. THESE TWO
FACTORS...COMBINED WITH TEMPERATURES JUST ABOVE THE FREEZING MARK
IN MANY AREAS RESULTING IN MELT AND COMPACTION OF THE SNOW...WILL
RESULT IN LOWER SNOW TOTALS. NONETHELESS...MUCH OF THE AREA WILL
SEE A PERIOD OF MODERATE TO LOCALLY HEAVY SNOW FOR A TIME THIS
EVENING AND OVERNIGHT...WITH SNOWFALL RATES APPROACHING AN INCH
AN HOUR IN SOME LOCATIONS. IN GENERAL...SNOWFALL AMOUNTS WILL
RANGE FROM 1 TO 3 INCHES ALONG AND NORTH OF INTERSTATE 80... WITH 
AMOUNTS OF 2 TO 4 INCHES SOUTH OF INTERSTATE 80 TO NEAR HIGHWAY
34. ALONG AND ESPECIALLY SOUTH OF HIGHWAY 34 IS WHERE THE HEAVIEST
SNOWFALL AMOUNTS WILL BE FOUND...GENERALLY RANGING FROM 4 TO 6
INCHES. WINDS WILL INCREASE TO 15 TO 25 MPH TONIGHT... RESULTING
IN SOME AREAS OF BLOWING AND DRIFTING.

ILZ007-250200-
/O.CAN.KDVN.WW.Y.0005.000000T0000Z-110225T1200Z/
CARROLL-
INCLUDING THE CITY OF...MOUNT CARROLL
700 PM CST THU FEB 24 2011

...WINTER WEATHER ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN QUAD CITIES HAS CANCELLED THE
WINTER WEATHER ADVISORY. 

SNOW IS EXPECTED TO DEVELOP BY LATE EVENING AND CONTINUE
FOR A WHILE OVERNIGHT. HOWEVER...SNOWFALL AMOUNTS ARE EXPECTED
TO REMAIN BELOW ADVISORY CRITERIA. 

$$

IAZ087>089-098-099-ILZ025-026-034-035-MOZ009-010-251100-
/O.CON.KDVN.WS.W.0001.000000T0000Z-110225T1200Z/
JEFFERSON-HENRY IA-DES MOINES-VAN BUREN-LEE-HENDERSON-WARREN-
HANCOCK-MCDONOUGH-SCOTLAND-CLARK-
INCLUDING THE CITIES OF...FAIRFIELD...MOUNT PLEASANT...
BURLINGTON...KEOSAUQUA....FORT MADISON...OQUAWKA...MONMOUTH...
CARTHAGE...MACOMB...MEMPHIS...KAHOKA
700 PM CST THU FEB 24 2011

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM CST FRIDAY...

A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM CST FRIDAY. 

* SNOW WILL CONTINUE TO DEVELOP THIS EVENING AND PERSIST INTO THE
  OVERNIGHT BEFORE TAPERING TO FLURRIES LATE. 

* SNOWFALL OF 4 TO 6 INCHES IS LIKELY.

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* SNOWFALL RATES WILL BE MODERATE TO HEAVY AT TIMES CAUSING
  REDUCED VISIBILITIES. THIS ALONG WITH ROADS BECOMING SNOW
  COVERED AND SLICK...WILL MAKE TRAVEL HAZARDOUS TONIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS 6 INCHES OR MORE OF
SNOW IS EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL VERY
DANGEROUS...SO ONLY TRAVEL IN AN EMERGENCY AND TAKE YOUR WINTER
SURVIVAL KIT.

&&

$$

IAZ063>068-076>078-ILZ009-015>018-024-251100-
/O.CON.KDVN.WW.Y.0005.000000T0000Z-110225T1200Z/
IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-
LOUISA-WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-
INCLUDING THE CITIES OF...MARENGO...IOWA CITY...TIPTON...
CLINTON...MUSCATINE...BETTENDORF...DAVENPORT...SIGOURNEY...
WASHINGTON...WAPELLO...STERLING...ROCK FALLS...MOLINE...
ROCK ISLAND...KEWANEE...PRINCETON...HENNEPIN...ALEDO
700 PM CST THU FEB 24 2011

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM CST
FRIDAY...

A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM CST
FRIDAY. 

* SNOW WILL DEVELOP MID TO LATE EVENING... AND PERSIST OVERNIGHT
  BEFORE TAPERING TO FLURRIES LATE. 

* SNOWFALL OF 1 TO 4 INCHES IS LIKELY...WITH THE HIGHER TOTALS
  SOUTH OF INTERSTATE 80. 

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* SNOWFALL RATES WILL BE MODERATE TO HEAVY AT TIMES CAUSING
  REDUCED VISIBILITIES. THIS ALONG WITH ROADS BECOMING SNOW
  COVERED AND SLICK...WILL MAKE TRAVEL HAZARDOUS LATE THIS EVENING
  AND OVERNIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLICK...SNOW
COVERED ROADS AND LIMITED VISIBILITIES...AND BE CAREFUL WHILE
DRIVING.

&&

$$
644 
WWUS43 KDVN 250249
WSWDVN

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
849 PM CST THU FEB 24 2011

...ACCUMULATING SNOW TONIGHT...

.A BAND OF MODERATE TO HEAVY SNOW EXTENDING FROM WEST OF CLINTON
TO NEAR IOWA CITY AND INTO SOUTHEAST IOWA...WILL CONTINUE TO SHIFT
SOUTHEAST ACROSS THE AREA LATE THIS EVENING INTO THE OVERNIGHT.
SNOWFALL RATES OF AN INCH OR SO AN HOUR WILL BE COMMON FOR A FEW
HOURS...RESULTING IN SNOWFALL AMOUNTS OF GENERALLY 2 TO 4 INCHES
ACROSS MUCH OF THE ADVISORY AREA...WITH LOCALLY HIGHER AMOUNTS OF
5 INCHES POSSIBLE FROM NEAR A LINE FROM FAIRFIELD TO WASHINGTON TO
WEST LIBERTY. WINDS WILL CONTINUE TO INCREASE TO 15 TO 25 MPH
TONIGHT... RESULTING IN SOME LOCALIZED AREAS OF BLOWING AND DRIFTING.

IAZ087>089-098-099-ILZ025-026-034-035-MOZ009-010-251200-
/O.CAN.KDVN.WS.W.0001.000000T0000Z-110225T1200Z/
/O.EXA.KDVN.WW.Y.0005.000000T0000Z-110225T1200Z/
JEFFERSON-HENRY IA-DES MOINES-VAN BUREN-LEE-HENDERSON-WARREN-
HANCOCK-MCDONOUGH-SCOTLAND-CLARK-
INCLUDING THE CITIES OF...FAIRFIELD...MOUNT PLEASANT...
BURLINGTON...KEOSAUQUA....FORT MADISON...OQUAWKA...MONMOUTH...
CARTHAGE...MACOMB...MEMPHIS...KAHOKA
849 PM CST THU FEB 24 2011

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 AM CST FRIDAY...
...WINTER STORM WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A
WINTER WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT UNTIL
6 AM CST FRIDAY. THE WINTER STORM WARNING HAS BEEN CANCELLED.

* A BAND OF MODERATE TO HEAVY SNOW WILL CONTINUE TO MOVE THROUGH
  LATE THIS EVENING INTO THE OVERNIGHT BEFORE TAPERING TO
  FLURRIES. 

* SNOWFALL OF 2 TO 4 INCHES IS LIKELY. 

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* SNOWFALL RATES WILL BE MODERATE TO HEAVY AT TIMES CAUSING
  REDUCED VISIBILITIES. THIS ALONG WITH ROADS BECOMING SNOW
  COVERED AND SLICK...WILL MAKE TRAVEL HAZARDOUS LATE THIS EVENING
  AND OVERNIGHT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL
CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLICK...SNOW COVERED
ROADS AND LIMITED VISIBILITIES...AND BE CAREFUL WHILE DRIVING.

&&

$$

ILZ009-016>018-251200-
/O.CAN.KDVN.WW.Y.0005.000000T0000Z-110225T1200Z/
/O.NEW.KDVN.WW.Y.0006.110225T0600Z-110225T1200Z/
WHITESIDE-HENRY IL-BUREAU-PUTNAM-
INCLUDING THE CITIES OF...STERLING...ROCK FALLS...KEWANEE...
PRINCETON...HENNEPIN
849 PM CST THU FEB 24 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO
6 AM CST FRIDAY...

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A
WINTER WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT FROM
MIDNIGHT TONIGHT TO 6 AM CST FRIDAY.

* A BAND OF MODERATE TO LOCALLY HEAVY SNOW WILL MOVE ACROSS THE
  AREA OVERNIGHT BEFORE TAPERING TO FLURRIES LATE.

* SNOWFALL OF 2 TO 4 INCHES IS LIKELY.

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* SNOWFALL RATES WILL BE MODERATE TO HEAVY AT TIMES CAUSING 
  REDUCED VISIBILITIES. THIS ALONG WITH ROADS BECOMING SNOW 
  COVERED AND SLICK...WILL MAKE TRAVEL HAZARDOUS LATE THIS 
  EVENING AND OVERNIGHT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLICK...SNOW
COVERED ROADS AND LIMITED VISIBILITIES...AND BE CAREFUL WHILE
DRIVING.

&&

$$

IAZ063-250400-
/O.CAN.KDVN.WW.Y.0005.000000T0000Z-110225T1200Z/
IOWA-
INCLUDING THE CITY OF...MARENGO
849 PM CST THU FEB 24 2011

...WINTER WEATHER ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN QUAD CITIES HAS CANCELLED THE
WINTER WEATHER ADVISORY. 

SNOW WILL CONTINUE TO TAPER OFF TO FLURRIES LATE THIS EVENING
WITH LITTLE IN THE WAY OF ADDITIONAL ACCUMULATION. THEREFORE
THE WINTER WEATHER ADVISORY HAS BEEN CANCELLED. 

$$

IAZ064>068-076>078-ILZ015-024-251200-
/O.CON.KDVN.WW.Y.0005.000000T0000Z-110225T1200Z/
JOHNSON-CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-
ROCK ISLAND-MERCER-
INCLUDING THE CITIES OF...IOWA CITY...TIPTON...CLINTON...
MUSCATINE...BETTENDORF...DAVENPORT...SIGOURNEY...WASHINGTON...
WAPELLO...MOLINE...ROCK ISLAND...ALEDO
849 PM CST THU FEB 24 2011

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM CST
FRIDAY...

A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM CST
FRIDAY. 

* A BAND OF MODERATE TO HEAVY SNOW WILL CONTINUE TO MOVE ACROSS
  THE AREA THIS EVENING INTO THE OVERNIGHT BEFORE TAPERING TO
  FLURRIES.

* SNOWFALL OF 2 TO 4 INCHES IS LIKELY...WITH LOCALLY HIGHER
  AMOUNTS AROUND 5 INCHES POSSIBLE IN ROUGHLY A 20 MILE CORRIDOR
  FROM NEAR WASHINGTON TO WEST LIBERTY. 

* WINDS WILL INCREASE TO 15 TO 25 MPH.

* SNOWFALL RATES WILL BE MODERATE TO HEAVY AT TIMES CAUSING
  REDUCED VISIBILITIES. THIS ALONG WITH ROADS BECOMING SNOW
  COVERED AND SLICK...WILL MAKE TRAVEL HAZARDOUS THIS EVENING AND
  OVERNIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLICK...SNOW
COVERED ROADS AND LIMITED VISIBILITIES...AND BE CAREFUL WHILE
DRIVING.

&&

$$

What forecasters said that day

The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before this winter storm warning went out at Feb 23, 3:35 PM CST, 11 hours 45 minutes earlier.

Area forecast discussion, Feb 23, 3:35 PM CST, 11 hours 45 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
335 PM CST WED FEB 23 2011

.SYNOPSIS...
TROUGH IN WESTERN IA WILL MOVE ACROSS THE CWA TONIGHT. SCATTERED
RAIN/SNOW SHOWERS CURRENTLY PUSHING ACROSS THE CWA. CURRENT
TEMPERATURES IN THE 30S ACROSS THE DVN CWA...WITH 70S IN THE
SOUTHERN PLAINS. COLDER AIR DIVING INTO THE NORTHERN PLAINS WITH
TEMPS THERE ONLY IN THE TEENS.  ..HAASE..

&&

.SHORT TERM...TONIGHT AND THURSDAY...
FORECAST FOCUS ON WALKING OUT THE PRECIP THIS EVENING AND WALKING IN
THE NEXT STORM SYSTEM THURSDAY.

TONIGHT...SCATTERED LIGHT RAIN AND SNOW SHOWERS SHOULD END EARLY
THIS EVENING. JUST ENOUGH EVAPORATIVE COOLING IN THE DRIER LOW
LEVELS TO CHANGE SOME OF THE RAIN TO SNOW. INVERSION TONIGHT SHOULD
TRAP THE CLOUDS SO MOSTLY CLOUDY OR CLOUDY SKIES EXPECTED. 850 MB
TEMPS A TAD COOLER BY MORNING SO MIN TEMPS SHOULD DROP INTO THE MID
20S TO AROUND 30.

THURSDAY...CLOUDY DAY WITH AN INCREASING NORTHEAST WIND TO 20 TO 25
MPH WILL MAKE FOR A RATHER CHILLY DAY. MAX TEMPS MAINLY IN THE 30S.
IMPRESSIVE TROUGH IN THE SOUTHERN ROCKIES WILL INDUCE CYCLOGENESIS
IN THE SOUTHERN PLAINS WITH GULF MOISTURE RAPIDLY GETTING PULLED
NORTHWARD ON A STRENGTHENING LOW LEVEL JET. OPERATIONAL MODELS
SIMILAR IN BRINGING PRECIPITATION INTO OUR SOUTHERN CWA IN THE
AFTERNOON. WILL HAVE LIKELY POPS FOR SOUTH OF HIGHWAY 34. WILL BRING
A SLIGHT CHANCE AS FAR NORTH AS ABOUT I-80. ALL THE MODELS INDICATE
850 MB TEMPS BELOW 0C IN ALL OF MY CWA. FORECAST SOUNDINGS SUGGEST
ALL SNOW BUT THE BOUNDARY TEMPS MAY WARM JUST ENOUGH TO KEEP IT A
MIX OF RAIN AND SNOW IN THE AFTERNOON. EVEN IF IT WAS ALL SNOW IT
SHOULD MELT ON CONTACT WITH TEMPS WELL IN THE 30S TO NEAR 40. WILL
NEED TO MONITOR TEMP AND PRECIP TRENDS.

..HAASE..

.LONG TERM...THURSDAY NIGHT THROUGH NEXT WEDNESDAY...
MAIN CONCERN FOR THE END OF THE WEEK WILL BE THE FAST MOVING
SOUTHERN STREAM SYSTEM MOVING FROM THE SOUTHWESTERN U.S. INTO THE
MISSISSIPPI RIVER VALLEY BY LATE THURSDAY NIGHT.  THE OPERATIONAL
MODELS ARE COMING INTO BETTER AGREEMENT WITH THE TRACK OF THE SYSTEM
WITH THE 12Z ECMWF/GFS/NAM MOVING THE SURFACE LOW NORTHEAST FROM
NORTHERN AR/SOUTHERN MO THURSDAY EVENING THROUGH THE OHIO RIVER
VALLEY INTO OHIO/WEST VIRGINIA BY FRIDAY MORNING.  WHERE THE MODELS
SHOW THEIR BIGGEST DIFFERENCE IS THE QPF FIELDS WITH THE NAM BY FAR
THE WETTEST PRODUCING OVER AN INCH OF LIQUID PRECIPITATION BETWEEN
00Z AND 12Z FRIDAY OVER OUR SOUTHEASTERN COUNTIES.   THE GFS WAS ON
THE OTHER END OF THE SCALE PRODUCING BETWEEN A QUARTER AND A HALF
INCH FOR AN EVENT TOTAL WHILE THE ECMWF WAS AROUND ONE HALF INCH BY
FRIDAY MORNING.  FOR NOW WILL STAY CLOSE TO THE GFS/ECMWF QPF WITH
NAM MOST LIKELY EXHIBITING IT/S WET BIAS WITH THIS SYSTEM.  ANOTHER
FACTOR THAT SHOULD IMPACT PRECIPITATION AMOUNTS WILL BE THE
NORTHEAST TO EAST NORTHEAST FETCH OFF HIGH PRESSURE OVER MN AND WI.
THIS WILL FEED DRY LOW LEVEL AIR INTO THE STORM THURSDAY EVENING
WHICH SHOULD IMPACT PCPN AMOUNTS OVER EASTERN IOWA AND NORTHWESTERN
ILLINOIS.  TEMPERATURES BY THURSDAY EVENING SHOULD BE COLD ENOUGH
FOR THE PRECIPITATION TO BE ALL SNOW WITH RATIOS IN THE 10 TO 13 TO
ONE RANGE FROM SOUTH TO NORTH. THESE RATIOS WOULD SUPPORT SNOW
AMOUNTS OF 1 TO 3 INCHES SOUTH OF LINE FROM NORTH OF FAIRFIELD
THROUGH THE STERLING/ROCKFALLS AREA OF NORTHWEST IL.  THE BULK OF
THE SNOW SHOULD OCCUR THURSDAY NIGHT WITH SOME LINGERING LIGHT SNOW
OR FLURRIES FRIDAY AS THE STORM PULLS AWAY.

MID LEVEL ZONAL FLOW SETS UP OVER THE WESTERN U.S. BEHIND THIS
SYSTEM WITH MODELS SHOWING SOME LIGHT OVERRUNNING TYPE SNOWS
SPREADING IN FROM THE WEST FRIDAY AFTERNOON AND CONTINUING THROUGH
SATURDAY NIGHT.   THIS SHOULD RESULT IN A PROLONGED PERIOD OF LIGHT
SNOW OR FLURRIES WITH SNOW ACCUMULATIONS OVER THE 24 TO 36 HOUR
PERIOD OF AN INCH OR LESS.

FOR EARLY NEXT WEEK THE LONG RANGE MODELS SHOW A SIGNIFICANT
SYSTEM LIFTING OUT OF THE SOUTHWEST U.S. SUNDAY NIGHT AND MONDAY.
THERE IS CONSIDERABLE DIFFERENCES IN THE TRACK AND TIMING OF THE
STORM BETWEEN THE ECMWF AND GFS. THE GFS FAVOR A MORE NORTHWEST
TRACK THROUGH NORTHWEST ILLINOIS SUNDAY NIGHT WHICH COULD BE A
SIGNIFICANT RAIN EVENT.  THE ECMWF EJECTS THE STORM THROUGH MO AND
CENTRAL IL MONDAY MORNING SUGGESTING MORE SNOW THAN RAIN.  FOR NOW
WILL GO WITH A MIX OF RAIN/SNOW AND EVEN SOME FREEZING RAIN FROM
SUNDAY INTO MONDAY.

AFTER THIS SYSTEM MOVES THROUGH WILL GO WITH A MAINLY DRY FORECAST
WITH RELATIVELY QUIET WEST NORTHWEST FLOW SETTING UP FOR MID WEEK.

TEMPERATURES THROUGH THE FORECAST PERIOD SHOULD NEAR TO SLIGHTLY
BELOW NORMAL WITH THE SPLIT FLOW KEEPING THE COLDER AIRMASS AT BAY
TO OUR NORTH.  ..DLF..

&&

.AVIATION...
VFR CONDS REMAINDER OF THIS AFTERNOON AND TONIGHT WITH SCATTERED
MVFR CIGS. WILL BRING IN MVFR CIGS ON THURSDAY WITH RAIN AND SNOW
DEVELOPING ALONG AND SOUTH OF HIGHWAY 34. SOUTHEAST WINDS 10 TO 15
KNOTS REMAINDER OF THE AFTERNOON BECOMING NORTHWEST TO NORTH LESS
THAN 10 KNOTS TONIGHT. THEN NORTHEAST 10 TO 15 KNOTS WITH GUSTS TO
OVER 20 KNOTS ON THURSDAY.

..HAASE..

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...NONE.
IL...NONE.
MO...NONE.

&&

HAASE/DLF
Hazardous weather outlook, Feb 23, 9:14 PM CST, 6 hours 6 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
914 PM CST WED FEB 23 2011

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-241100-
BENTON IA-BUCHANAN IA-BUREAU IL-CARROLL IL-CEDAR IA-CLARK MO-
CLINTON IA-DELAWARE IA-DES MOINES IA-DUBUQUE IA-HANCOCK IL-
HENDERSON IL-HENRY IA-HENRY IL-IOWA IA-JACKSON IA-JEFFERSON IA-
JO DAVIESS IL-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA-LINN IA-LOUISA IA-
MCDONOUGH IL-MERCER IL-MUSCATINE IA-PUTNAM IL-ROCK ISLAND IL-
SCOTLAND MO-SCOTT IA-STEPHENSON IL-VAN BUREN IA-WARREN IL-
WASHINGTON IA-WHITESIDE IL-
914 PM CST WED FEB 23 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST
CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST
MISSOURI.

.DAY ONE...TONIGHT

DENSE FOG WILL REDUCE VISIBILITIES TO ONE QUARTER MILE OR LESS
AT TIMES THROUGH MIDNIGHT. AFTER MIDNIGHT...THE FOG WILL
DISSIPATE AS A COLD FRONT AND DRIER AIR SWEEP ACROSS THE OUTLOOK
AREA.

SOME AREA RIVERS ARE EXPERIENCING FLOODING. PLEASE SEE THE LATEST
FLOOD STATEMENTS AND FLOOD WARNINGS FOR DETAILS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A WINTER STORM SYSTEM WILL LOOK TO MOVE EAST ACROSS SOUTHERN MISSOURI
AND UP THE OHIO RIVER VALLEY THURSDAY INTO FRIDAY. THIS SYSTEM WILL
LIKELY PRODUCE SNOW ACROSS MUCH OF THE OUTLOOK AREA THURSDAY NIGHT...
WITH AT LEAST SOME LIGHT ACCUMULATIONS POSSIBLE BY FRIDAY MORNING.
LATEST INDICATIONS SUGGEST THAT AREAS ALONG AND SOUTH OF INTERSTATE
80 MAY RECEIVE 1 TO 3 INCHES OF SNOWFALL BY FRIDAY MORNING...WITH
LOCALLY HIGHER AMOUNTS SOUTH OF A LINE FROM KEOSAUQUA IOWA...TO
MONMOUTH ILLINOIS. NORTH WINDS OF 15 TO 25 MPH WILL PRODUCE SOME
DRIFTING OF ANY SNOW THAT FALLS. THE EXACT TRACK OF THIS SYSTEM IS
STILL SOMEWHAT UNCERTAIN...AND ANY DEVIATION NORTH OR SOUTH FROM THE
CURRENTLY EXPECTED TRACK MAY LEAD TO MORE SNOW AMOUNTS...OR LESS.
STAY TUNED FOR LATER FORECASTS AND STATEMENTS CONCERNING THIS
THURSDAY NIGHT STORM SYSTEM.

MORE SNOW WILL BE POSSIBLE LATE FRIDAY INTO SATURDAY AS ANOTHER
WEATHER SYSTEM MOVES ACROSS PORTIONS OF THE MIDWEST. SNOW AMOUNTS
WITH THIS WEEKEND SYSTEM ARE UNCERTAIN AT THIS TIME...BUT THE LATEST
INDICATIONS SUGGEST THAT LIGHT SNOW ACCUMULATIONS OF A COUPLE
OF INCHES ARE POSSIBLE.

AN ACTIVE WEATHER PATTERN WILL LEAD TO ANOTHER POTENTIALLY MAJOR
STORM SYSTEM WHICH COULD PRODUCE SIGNIFICANT AMOUNTS OF RAIN OR SNOW
IN THE OUTLOOK AREA SUNDAY NIGHT INTO MONDAY. THE STORM TRACK AND
AMOUNTS OF EACH TYPE OF PRECIPITATION WITH THIS SYSTEM IS UNCERTAIN
AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED TONIGHT.

In the hours before

Special weather statement, Feb 23, 9:53 PM CST, 5 hours 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
953 PM CST WED FEB 23 2011

IAZ042-053-054-065-066-068-ILZ001-002-007-009-015>018-240600-
DUBUQUE-JONES-JACKSON-CEDAR-CLINTON-SCOTT-JO DAVIESS-STEPHENSON-
CARROLL-WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-
INCLUDING THE CITIES OF...DUBUQUE...ANAMOSA...MAQUOKETA...
TIPTON...CLINTON...BETTENDORF...DAVENPORT...GALENA...FREEPORT...
MOUNT CARROLL...STERLING...ROCK FALLS...MOLINE...ROCK ISLAND...
KEWANEE...PRINCETON...HENNEPIN
953 PM CST WED FEB 23 2011

...PATCHY DENSE FOG AND AREAS OF DRIZZLE WITH SCATTERED SLICK
SPOTS THIS EVENING...

AREAS OF FOG...LOCALLY DENSE REDUCING VISIBILITIES TO ONE
QUARTER MILE OR LESS... WILL PERSIST THROUGH MIDNIGHT BEFORE
DISSIPATING AS A COLD FRONT SWEEPS ACROSS THE REGION. IN ADDITION
TO THE FOG... PATCHY DRIZZLE WILL BE POSSIBLE. AS TEMPERATURES
SLOWLY DROP TO THE FREEZING MARK IN SOME LOCATIONS ALONG AND NORTH
OF INTERSTATE 80...A LIGHT GLAZING OF ICE WILL BE POSSIBLE...
ESPECIALLY ON BRIDGES AND OVERPASSES. ALSO... WET PAVEMENT DUE TO
THE RECENT RAINS MAY FREEZE ON AREA ROADWAYS. IF YOU WILL BE
TRAVELING THIS EVENING... SLOW DOWN AND REMAIN ALERT FOR RAPID
CHANGES IN VISIBILITY. MOTORISTS ALONG AND NORTH OF INTERSTATE 80
WILL NEED TO EXERCISE CAUTION FOR SLICK SPOTS FROM BLACK ICE AND A
VERY LIGHT GLAZE FROM FREEZING DRIZZLE... ESPECIALLY ON BRIDGES
AND OVERPASSES.

IAZ063-064-067-076>078-087>089-098-099-ILZ024>026-034-035-MOZ009-
010-240600-
IOWA-JOHNSON-MUSCATINE-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-
HENRY IA-DES MOINES-VAN BUREN-LEE-MERCER-HENDERSON-WARREN-HANCOCK-
MCDONOUGH-SCOTLAND-CLARK-
INCLUDING THE CITIES OF...MARENGO...IOWA CITY...MUSCATINE...
SIGOURNEY...WASHINGTON...WAPELLO...FAIRFIELD...MOUNT PLEASANT...
BURLINGTON...KEOSAUQUA....FORT MADISON...ALEDO...OQUAWKA...
MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...KAHOKA
953 PM CST WED FEB 23 2011

...AREAS OF DENSE FOG THIS EVENING...

LIGHT WINDS AND ABUNDANT LOW LEVEL MOISTURE HAS ALLOWED AREAS OF
DENSE FOG TO FORM THIS EVENING. THE FOG WILL REDUCE VISIBILITIES
TO LESS THAN ONE QUARTER MILE... AND TO NEAR ZERO IN A FEW SPOTS.
THE FOG IS EXPECTED TO DISSIPATE AFTER MIDNIGHT...AS A COLD FRONT
AND DRIER AIR SWEEP THROUGH THE REGION. IF YOU WILL BE TRAVELING
THIS EVENING... SLOW DOWN AND BE PREPARED FOR RAPID CHANGES IN
VISIBILITY.
Special weather statement, Feb 23, 11:50 PM CST, 3 hours 30 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1150 PM CST WED FEB 23 2011

IAZ054-065-066-068-ILZ001-002-007-009-015>018-240800-
JACKSON-CEDAR-CLINTON-SCOTT-JO DAVIESS-STEPHENSON-CARROLL-
WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-
INCLUDING THE CITIES OF...MAQUOKETA...TIPTON...CLINTON...
BETTENDORF...DAVENPORT...GALENA...FREEPORT...MOUNT CARROLL...
STERLING...ROCK FALLS...MOLINE...ROCK ISLAND...KEWANEE...
PRINCETON...HENNEPIN
1150 PM CST WED FEB 23 2011

...PATCHY DENSE FOG AND AREAS OF DRIZZLE WITH SCATTERED SLICK
SPOTS INTO THE EARLY MORNING...

AREAS OF FOG...LOCALLY DENSE REDUCING VISIBILITIES TO ONE
QUARTER MILE OR LESS... WILL PERSIST THROUGH 1 AM BEFORE
DISSIPATING AS A COLD FRONT SWEEPS ACROSS THE REGION. IN ADDITION
TO THE FOG... PATCHY DRIZZLE WILL BE POSSIBLE. AS TEMPERATURES
SLOWLY DROP TO THE FREEZING MARK IN SOME LOCATIONS ALONG AND NORTH
OF INTERSTATE 80...A LIGHT GLAZING OF ICE WILL BE POSSIBLE...
ESPECIALLY ON BRIDGES AND OVERPASSES. ALSO... WET PAVEMENT DUE TO
THE RECENT RAINS MAY FREEZE ON AREA ROADWAYS. IF YOU WILL BE
TRAVELING INTO THE EARLY MORNING... SLOW DOWN AND REMAIN ALERT
FOR RAPID CHANGES IN VISIBILITY. MOTORISTS ALONG AND NORTH OF
INTERSTATE 80 WILL NEED TO EXERCISE CAUTION FOR SLICK SPOTS FROM
BLACK ICE AND A VERY LIGHT GLAZE FROM FREEZING DRIZZLE...
ESPECIALLY ON BRIDGES AND OVERPASSES.

IAZ063-064-067-076>078-087>089-098-099-ILZ024>026-034-035-MOZ009-
010-240800-
IOWA-JOHNSON-MUSCATINE-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-
HENRY IA-DES MOINES-VAN BUREN-LEE-MERCER-HENDERSON-WARREN-HANCOCK-
MCDONOUGH-SCOTLAND-CLARK-
INCLUDING THE CITIES OF...MARENGO...IOWA CITY...MUSCATINE...
SIGOURNEY...WASHINGTON...WAPELLO...FAIRFIELD...MOUNT PLEASANT...
BURLINGTON...KEOSAUQUA....FORT MADISON...ALEDO...OQUAWKA...
MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...KAHOKA
1150 PM CST WED FEB 23 2011

...AREAS OF DENSE FOG INTO THE EARLY MORNING...

AREAS OF DENSE FOG WILL PERSIST THROUGH 1 AM. THE FOG WILL REDUCE
VISIBILITIES TO LESS THAN ONE QUARTER MILE... AND TO NEAR ZERO IN
A FEW SPOTS. THE FOG IS EXPECTED TO DISSIPATE BETWEEN 1 AM AND
3 AM... AS A COLD FRONT AND DRIER AIR SWEEP THROUGH THE REGION. IF
YOU WILL BE TRAVELING INTO THE EARLY MORNING... SLOW DOWN AND BE
PREPARED FOR POOR VISIBILITY AT TIMES.

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 24, 3:20 AM CSTWinter Weather AdvisoryDVNCedar, Clinton, Des Moines, Henry, Iowa, Jefferson and 8 more26 hr

Nearby

Winter Storm Warnings in Iowa, 2011Winter Storm Warnings in Illinois, 2011Winter Storm Warnings in Missouri, 2011Every winter storm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.