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Polk County, IA Weather and Climate Synopsis

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Weather Summary for Iowa
National Weather Service Des Moines IA
518 PM CDT Fri Jul 20 2018

After an eventful day with a few destructive tornadoes yesterday, the
area was greeted with a much needed quiet day weather wise. Scattered
clouds were seen as the big upper level low pressure system moved to
the east, also providing some breezy northwest winds around 15 to 20
mph and gusts to 25 plus mph at times. Highs were very comfortable,
generally a few degrees below normal, in the mid 70s to low 80s in
most locations. 

The story going forward will be for overall quiet and comfortable
weather for mid to late July. The weather will predominantly be quiet
with only a couple scattered opportunities for showers or storms next 
week, and temperatures in the upper 70s to mid 80s for highs.

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 700 PM CDT FRI JUL 20 2018

...KANSAS...SOUTHEAST NEBRASKA AND IOWA...
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
TOPEKA         PTSUNNY   85  68  56 CALM      29.89F                  
6HR MIN TEMP:  81; 6HR MAX TEMP:  89; 6HR PCP: TRACE;                

MANHATTAN      SUNNY     87  68  52 E6        29.90S HX  90           
EMPORIA        MOSUNNY   89  68  49 S7        29.90F HX  93           
CHANUTE        MOSUNNY   93  70  46 E6        29.90R HX  99           
WICHITA        MOSUNNY   94  69  44 E22G32    29.87S HX  99           
OMAHA          MOSUNNY   84  65  52 N10       29.92S                  
LINCOLN        SUNNY     84  68  58 NE6       29.95S                  
FALLS CITY     CLOUDY    83  68  60 N6        29.92S                  
LAMONI         SUNNY     82  64  54 N10       29.90S                  
DES MOINES     MOSUNNY   81  61  50 NW14G28   29.87S                  

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


Current Agricultural Weather Conditions in Iowa
Based on observations at 700pm CDT, Friday July 20, 2018

Across Iowa...temperatures are near 83 degrees west, near 81 degrees central, and near 75 degrees east. Current sky conditions are partly sunny west, mostly sunny central, and fair east. In the west, relative humidity is near 50%, and the dew point is near 63 degrees. The heat index is near 84 degrees west. In the central part of the state, relative humidity is near 50%, and the dew point is near 61 degrees. The heat index is near 82 degrees central. In the east, relative humidity is near 68%, and the dew point is near 64 degrees. The livestock heat stress category is no stress west, no stress central, and no stress east. Winds are from the north at 8 mph west, where conditions are favorable for spraying. Winds are from the northwest at 14 mph with gusts at 28 mph central, where conditions are not favorable for spraying due to strong winds. Winds are from the west at 15 mph with gusts at 28 mph east, where conditions are not favorable for spraying due to strong winds. Based on current available observations, the highest temperature is 83 degrees at Sioux City. The lowest temperature is 69 degrees at Dubuque.


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

328 PM CDT Fri Jul 20 2018

 DAY ONE  This afternoon and tonight

An isolated rain shower will be possible this afternoon mainly 
north of US Highway 30 and east of Interstate 35. There is no
severe threat.

 DAYS TWO THROUGH SEVEN  Saturday through Thursday

Additional non-severe thunderstorm chances return Monday and Wednesday.

 SPOTTER INFORMATION STATEMENT  

Spotter activation will not be needed.

NWS Severe Weather Map , Convective Outlook


7-Day Forecast For POLK County, IA
721 PM CDT Fri Jul 20 2018

TONIGHT
Mostly clear. Low in the mid 60s. Northwest wind 5 to 15 mph. Gusts up to 30 mph through midnight.

SATURDAY
Mostly sunny. High in the lower 80s. North wind 5 to 15 mph.

SATURDAY NIGHT
Mostly clear. Low in the mid 60s. North wind 5 to 15 mph.

SUNDAY
Mostly sunny. High in the lower 80s. North wind 5 to 10 mph.

SUNDAY NIGHT
Partly cloudy. Low in the mid 60s. North wind near 10 mph.

MONDAY
Partly sunny. High in the mid 80s.

MONDAY NIGHT
Partly cloudy. Low in the mid 60s.

TUESDAY
Sunny. High in the mid 80s.

TUESDAY NIGHT
Partly cloudy. Low in the mid 60s.

WEDNESDAY
Partly sunny. A 30 percent chance of thunderstorms in the afternoon. High in the mid 80s.

WEDNESDAY NIGHT
Partly cloudy. Low in the lower 60s.

THURSDAY
Mostly sunny. A 20 percent chance of thunderstorms in the afternoon. High in the lower 80s.

THURSDAY NIGHT
Mostly cloudy with a 30 percent chance of thunderstorms. Low in the lower 60s.

FRIDAY
Partly sunny with a 40 percent chance of thunderstorms. High in the lower 80s.

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
                                 IOWA                                                                     
                 ---------------------------------------------
                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
                   JUL 26-30 JUL 28-AUG 3    JUL       JUL-SEP                      
                 -----------  -----------  --------  ---------
   Temperature:      Below        Below      Above     Normal                      
 Precipitation:      Above        Above     Normal     Normal                      

....  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

Friday July 20, 2018 the 201th Day of Year

---------------------------------------------------
SUN
Declination 20.470000
Distance 0.999716 AU
Rise 06:56 EDT Set 21:44 EDT
Transit Meridian 14:20 EDT
Civil Twilight Begins 06:25 EDT Ends 22:15 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

////////////////////////
JULY 20TH...HISTORIC WEATHER EVENTS
...1930...
The temperature at Washington D.C. soared to an all-time record of 106
degrees. The next day Millsboro reached 110 degrees to set a record for the
state of Delaware. July 1930 was one of the hottest and driest summers in
the U.S., particularly in the Missouri Valley where severe drought
conditions developed. Toward the end of the month state records were set
for Kentucky with 114 degrees, and Mississippi with 115 degrees. (David
Ludlum)
...1934...
The temperature at Keokuk IA soared to 118 degrees to establish a state
record. (The Weather Channel)
...1953...
Twenty-two inches of hail reportedly fell northeast of Dickinson ND. (The
Weather Channel)
...1986...
The temperature at Charleston SC hit 104 degrees for the second day in a
row to tie their all-time record high. (The Weather Channel)
...1987...
Thunderstorms produced severe weather across Minnesota, Wisconsin and
Michigan. Thunderstorms produced wind gusts to 87 mph at Mosinee WI, and
strong thunderstorm winds capsized twenty-six boats on Grand Traverse Bay
drowning two women. Thunderstorms produced nine inches of rain at Shakopee
MN, with 7.83 inches reported in six hours at Chaska MN. Thunderstorms in
north central Nebraska produced hail as large as golf balls in southwestern
Cherry County, which accumulated to a depth of 12 inches. (The National
Weather Summary) (Storm Data)
...1988...
The temperature at Redding CA soared to an all-time record high of 118
degrees. Showers and thunderstorms produced much needed rains from New
England to southern Texas. Salem IN was deluged with 7.2 inches of rain
resulting in flash flooding. (The National Weather Summary)
...1989...
Showers and thunderstorms in the Middle Atlantic Coast Region soaked
Wilmington DE with 2.28 inches of rain, pushing their total for the period
May through July past the previous record of 22.43 inches. Heavy rain over
that three month period virtually wiped out a 16.82 inch deficit which had
been building since drought conditions began in 1985. Thunderstorms in
central Indiana deluged Lebanon with 6.50 inches of rain in twelve hours,
and thunderstorms over Florida produced wind gusts to 84 mph at Flagler
Beach. (The National Weather Summary) (Storm Data)

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