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Sioux County, IA Weather and Climate Synopsis

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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
507 PM CDT Sun Jul 22 2018

Today was nearly a carbon copy of the weather seen across the state on
Saturday. Northwesterly winds kept temperatures 5 to 10 degrees below
normal for late July, with highs generally in the mid 70s to low 80s.
Mostly cloudy conditions held in through the afternoon over the
eastern half of the state, but abundant sunshine was seen for the
western half. That will change tonight as clouds move in from the west
overnight, with temperatures dropping into the 60s. A few
thunderstorms are also possible near the Missouri River, along with
patchy fog in central Iowa.

Any fog will be quick to dissipate Monday morning. Chances for a few
thunderstorms will stretch into central Iowa as a weak front slides
through the state. The threat for severe weather will be low, and a
widespread soaking rainfall is not likely. Temperatures will warm 
back closer to normal by Wednesday as highs return in the mid to upper
80s over the southern half of the state, but another passing front 
will bring additional chances for a few showers and storms. A 
seasonably cool air mass will move in behind the front, which will 
keep below normal temperatures in the forecast through the end of the
week. Chances for isolated showers and storms hang around, but most 
areas will likely remain dry. 

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

Precision Agriculture Weather Forecast For SIOUX County

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Regional Hourly Observations For SIOUX County
Issued at 100 AM CDT MON JUL 23 2018

CARROLL *      CLOUDY    63  63 100 W3        30.06F                  
CHEROKEE *     CLOUDY    66  65  97 CALM      30.07F                  
DENISON *      CLOUDY    64  64 100 CALM      30.09S FOG              
LE MARS *      CLOUDY    68  68 100 CALM      30.07R                  
ORANGE CITY *  CLOUDY    72  66  83 CALM      30.08S                  
SHELDON *      LGT RAIN  66  66 100 CALM      30.06F                  
SIOUX CITY     CLOUDY    68  66  93 S3        30.06R                  
6HR MIN TEMP:  67; 6HR MAX TEMP:  82;                                

SPENCER        CLOUDY    67  64  90 CALM      30.08S                  
6HR MIN TEMP:  65; 6HR MAX TEMP:  81;                                

STORM LAKE *   CLOUDY    64  63  94 CALM      30.08S                  

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

Current Agricultural Weather Conditions in Iowa
Based on observations at 100am CDT, Monday July 23, 2018

Across Iowa...temperatures are near 68 degrees west, near 71 degrees central, and near 64 degrees east. Current sky conditions are cloudy west, partly cloudy central, and fair east. In the west, relative humidity is near 93%, and the dew point is near 66 degrees. In the central part of the state, relative humidity is near 81%, and the dew point is near 65 degrees. In the east, relative humidity is near 93%, and the dew point is near 62 degrees. The livestock heat stress category is no stress west, no stress central, and no stress east. Winds are from the south at 3 mph west, where conditions are favorable for spraying. Winds are calm central, where conditions are favorable for spraying. Winds are from the north at 6 mph east, where conditions are favorable for spraying. Based on current available observations, the highest temperature is 71 degrees at Des Moines. The lowest temperature is 62 degrees at Waterloo.

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 SIOUX County,IA

326 PM CDT Sun Jul 22 2018

 DAY ONE  This Afternoon and Tonight

Thunderstorms are possible overnight into early Monday morning, 
but are not expected to be severe.

 DAYS TWO THROUGH SEVEN  Monday through Saturday

No hazardous weather is expected at this time.


Spotter activation will not be needed.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For SIOUX County, IA
112 AM CDT Mon Jul 23 2018

Mostly cloudy with a 50 percent chance of thunderstorms. Lows around 67. South winds around 5 mph.

Mostly cloudy with a 30 percent chance of thunderstorms in the morning, then sunny in the afternoon. Highs around 82. Northwest winds 5 to 10 mph becoming north 10 to 15 mph in the afternoon.

Mostly clear. Lows around 58. North winds 5 to 10 mph.

Sunny. Highs around 82. Northwest winds 5 to 10 mph.

Mostly clear. A 20 percent chance of light showers after midnight. Lows around 61. South winds 5 to 10 mph.

Partly sunny. Chance of thunderstorms in the morning, then slight chance of showers in the afternoon. Highs around 80. Chance of rain 30 percent.

Partly cloudy. A 20 percent chance of showers in the evening. Lows around 57.

Sunny in the morning then becoming partly cloudy. Highs around 75.

Mostly clear. Lows around 55.

Sunny in the morning then becoming partly cloudy. Highs around 77.

Partly cloudy in the evening, then mostly cloudy with a 40 percent chance of thunderstorms after midnight. Lows around 58.

Partly sunny with a 50 percent chance of thunderstorms. Highs around 76.

Mostly cloudy with a 30 percent chance of thunderstorms. Lows around 59.

Partly cloudy. Highs around 79.

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 
                JUL 28-AUG 1 JUL 30-AUG 5    JUL       JUL-SEP                      
                 -----------  -----------  --------  ---------
   Temperature:      Below        Below      Above     Normal                      
 Precipitation:     Normal        Below     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

Monday July 23, 2018 the 204th Day of Year

Declination 19.860000
Distance 0.999716 AU
Rise 06:59 EDT Set 21:41 EDT
Transit Meridian 14:20 EDT
Civil Twilight Begins 06:28 EDT Ends 22:12 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 weather diary kept by George Washington recorded that the center of a
hurricane passed directly over his Mount Vernon home. The hurricane crossed
eastern North Carolina and Virginia before moving into the Central
Appalachians. Norfolk VA reported houses destroyed, trees uprooted, and
crops leveled to the ground. (David Ludlum)
A two hour thunderstorm deluged Atlanta GA with 4.32 inches of rain. More
than a foot of water flooded Union Depot. Many street car motors burned out
while trying to run through flooded streets. It grew so dark before the
afternoon storm that gas lights were needed. (The Weather Channel)
Sheridan WY was drenched with 4.41 inches of rain, an all-time 24 hour
record for that location. Associated flooding washed out 20 miles of
railroad track. (22nd-23rd) (The Weather Channel)
Thunderstorms produced a record ten inches of rain in six and a half hours
at Minneapolis MN, including 5.26 inches in two hours. Flash flooding
claimed two lives and caused 21.3 million dollars damage. Streets in
Minneapolis became rushing rivers, parking lots became lakes, and storm
sewers spouted like geysers. A tornado hit Maple Grove MN causing five
million dollars damage. Baseball size hail was reported at Olivia MN. (The
National Weather Summary) (Storm Data)
Thunderstorms produced severe weather in Lower Michigan and northern Ohio,
over eastern sections of the Dakotas, and over the Central High Plains
Region. Showers and thunderstorms soaked Wilmington NC with another two
inches of rain, following six and a half inches the previous day. (The
National Weather Summary)
Morning thunderstorms in the central U.S. drenched central Oklahoma with up
to six inches of rain. Afternoon thunderstorms produced wind gusts to 85
mph at Fort Smith AR. Evening thunderstorms over Florida spawned a tornado
which touched down three times in south Fort Myers causing nearly three
quarters of a million dollars damage. (The National Weather Summary) (Storm

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