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Polk County, IA Weather and Climate Synopsis

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Weather Summary Hourly Observations Nowcast Precision Ag., Lawn & Garden Guidance
7 Day Forecast Medium & Long Range Outlook Almanac Historical Facts

US Weekly Rainfall Departure

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A joint service of the UK Ag Weather Center and the National Weather Service.

Weather Summary for Iowa
National Weather Service Des Moines IA
509 AM CDT Thu Mar 22 2018

Clouds are moving across Iowa early this morning with a mixture of
very light rain mixed with snow at times occurring from western Iowa
through the south central counties. Temperatures remain in the mid 20s
over the eastern portion of the state while milder readings are found
over the west where temperatures are in the mid 30s to lower 40s.  

A warm front will push east across Iowa today with the light rain snow
mixture ending later this morning or early afternoon. Warmer afternoon
temperatures are expected with highs ranging from the mid 40s over 
the northeast to the lower 60s in the far west today. Clouds will 
remain over the region tonight as milder air remains heading into the 
region. Friday will see big changes. A large storm system will bring 
abundant moisture into the Central Plains. Widespread rainfall is 
expected along with moderate to heavy wet snowfall over portions of 
northern, eastern and northeast Iowa, southern Minnesota, southwest 
Wisconsin and northwest Illinois. Snowfall totals may exceed 6 or more
inches with the heavier snow and winter storm watches have been 
posted for portions of northern Iowa and surrounding states. Over the 
remainder of Iowa, much of the precipitation will fall as rain. Over 
an inch of rainfall is possible. 

Highs Friday will be cooler over most of the area with high in the 
lower 40s north to the lower to mid 50s south. The storm will continue
into Saturday. As winds pick up over the region, falling snow and 
lower visibility may cause travel impacts over the region. After the
storm pulls east on Saturday highs will warm from Saturday into Sunday
back into the 30s northeast to the lower 50s southwest. Another storm
will affect the region Monday with more rainfall mixed with snow at

National Ag. Weather Outlook, International Ag. Weather Summary
Current Surface Map, [2nd Source TWC]

Precision Agriculture Weather Forecast For POLK County

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Regional Hourly Observations For POLK County
Issued at 900 AM CDT THU MAR 22 2018

AMES           CLOUDY    33  28  81 SE7       30.33R WCI  27          
ANKENY *       CLOUDY    34  28  80 SE6       30.34R WCI  29          
BOONE *        CLOUDY    34  30  86 SE12      30.30S WCI  25          
CHARITON *     CLOUDY    34  30  86 SE7       30.32F WCI  28          
DES MOINES     LGT RAIN  35  30  82 SE8       30.32S WCI  29          
GRINNELL*      CLOUDY    34  29  81 SE5       30.35S WCI  30          
KNOXVILLE *    CLOUDY    34  27  75 SE7       30.33S WCI  28          
MARSHALLTOWN   MOSUNNY   32  28  85 E7        30.34S WCI  26          
NEWTON *       CLOUDY    34  28  80 SE9       30.34S WCI  26          
PELLA *        MOSUNNY   35  28  77 SE7       30.35F WCI  29          
PERRY *        LGT RAIN  34  32  93 E10       30.30F WCI  26          

Current Temperatures, Dewpoint, RH, Wind, Regional Obs, Surface 4-Panel

Current Agricultural Weather Conditions in Iowa
Based on observations at 800am CDT, Thursday March 22, 2018

Across Iowa...temperatures are near 35 degrees west, near 35 degrees central, and near 26 degrees east. Current sky conditions are clear west, light snow central, and fair east. In the west, relative humidity is near 92%, and the dew point is near 33 degrees. In the central part of the state, relative humidity is near 72%, and the dew point is near 27 degrees. In the east, relative humidity is near 77%, and the dew point is near 20 degrees. Winds are from the southeast at 8 mph west, where conditions are favorable for spraying. The wind chill is near 29 degrees west. Winds are from the southeast at 8 mph central, where conditions are not favorable for spraying due to light snow. The wind chill is near 29 degrees central. Winds are from the north at 3 mph east, where conditions are favorable for spraying. Based on current available observations, the highest temperature is 41 degrees at Clarinda. The lowest temperature is 25 degrees at Quad Cities.

Current NOWCAST not available:
Nowcasts are not issued routinely during fair weather. Only when
precipitation or other significant weather is occuring in this county will these
forecasts be issued. Currently, there is no short term forecast in effect.

US Radar, All NWS Radars (In near-real time), Current Livestock Heat Stress Index (LSI), Current Wind Chill Map
Hazardous Weather Outlook For POLK County,IA

412 AM CDT Thu Mar 22 2018

 DAY ONE  Today and tonight

No hazardous weather is expected at this time.

 DAYS TWO THROUGH SEVEN  Friday through Wednesday

Rain is expected Friday. Moderate rainfall possible in some 
locations. Isolated non-severe thunderstorms are also possible
Friday evening south of Interstate 80. Rain may mix with or change
to snow late Friday night into early Saturday morning mainly north
of highway 30 before changing back to rain by late Saturday 
morning. There may also be a brief period of freezing rain early
Saturday morning which could deposit a light glaze.

Additional precipitation is possible Monday through Tuesday. Rain
and isolated non-severe thunderstorms will be possible Monday
afternoon and evening changing to snow mainly north of highway 20 Monday


Spotter activation will not be needed at this time, though reports
of any rain and snow accumulations are appreciated.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For POLK County, IA
707 AM CDT Thu Mar 22 2018

Mostly cloudy. A chance of light snow possibly mixed with rain through mid morning, then a chance of light rain before noon. High around 50. Southeast wind near 15 mph. Chance of precipitation 50 percent.

Mostly cloudy. Low in the mid 30s. East wind 5 to 10 mph.

Cloudy. A slight chance of light rain before noon. Light rain in the afternoon. Breezy. High in the upper 40s. East wind 10 to 20 mph with gusts to around 35 mph. Chance of rain 80 percent.

Rain, breezy. Low in the mid 30s. East wind 15 to 20 mph with gusts to around 35 mph. Chance of rain 90 percent.

Light rain possibly mixed with snow in the morning, then light rain likely in the afternoon. Breezy. High around 40. Northeast wind 15 to 20 mph with gusts to around 30 mph. Chance of precipitation 90 percent.

Mostly cloudy. Low in the upper 20s.

Mostly cloudy. High in the mid 40s.

Mostly cloudy. A 50 percent chance of light rain and snow after midnight. Low in the mid 30s.

Light rain likely possibly mixed with snow in the morning, then light rain likely in the afternoon. High in the lower 50s. Chance of precipitation 60 percent.

Light rain and a slight chance of thunderstorms. Low in the lower 40s. Chance of precipitation 80 percent.

Mostly cloudy. Light rain in the morning, then a chance of light rain in the afternoon. High in the lower 50s. Chance of rain 80 percent.

Mostly cloudy. Low in the mid 30s.

Partly sunny. A 20 percent chance of light rain and snow in the morning. High in the lower 50s.

12-48 Hr Surface Forecast Maps, TWC 4-Panel Surface Forecast, Fire Danger, Day 1 Precip, Day 2 Precip, Days 1-5 Precip, Severe Weather Pot.-Day 1, Day 2

Medium & Long Range Outlook For Iowa
                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
               MAR 27-MAR 31 MAR 29-APR 4    MAR       MAR-MAY                      
                 -----------  -----------  --------  ---------
   Temperature:     Normal        Below      Below     Normal                      
 Precipitation:      Above        Below     Normal      Above                      

....  Medium and long range outlooks provided by NCEP/K. Thomas Priddy
5 Day Rainfall Forecast, 6 to 10 Day , 8 to 14 Day , Text, 30-Day Outook, 90-Day Outook, 120-Day Outlook
Almanac Information

Thursday March 22, 2018 the 81th Day of Year

Declination 1.030000
Distance 0.999721 AU
Rise 07:13 EDT Set 19:29 EDT
Transit Meridian 13:20 EDT
Civil Twilight Begins 06:46 EDT Ends 19:56 EDT

Calculations made for central point in the state.
Time in ET -- and will vary due to location and
elevation -- Priddy

Historical Weather And Climate Facts For Today

A spectactular display of the Northern Lights was visible as far south as
Bradenton FL, El Paso TX, and Fresno CA. At Detroit MI, the display was
described "so brilliant as to blot out all stars below first magnitude".
(22nd-23rd) (The Weather Channel)
A great flood crested on rivers from Ohio to Maine. The flood claimed 107
lives and caused 270 million dollars property damage. (David Ludlum)
Six to ten inch rains caused the Chicago River to overflow its banks. (The
Weather Channel)

Ag Weather Center, Department of Biosystems & Agricultural Engineering, University of Kentucky