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Obrien County, IA Weather and Climate Synopsis

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Weather Summary for Iowa
National Weather Service Des Moines IA
346 AM CST Tue Dec 31 2024

Today: 

Low pressure moving from Missouri into Central Illinois overnight
produced a broad area of light rain and snow across central and
southern Iowa early this morning. There were spotty areas of snow
accumulations with a few areas receiving around an inch or so.
Most primary roads and highways remained wet although less traveled
roads did become slushy in areas. Otherwise, northwest winds increased
and were common from 10 to 20 mph with gusts to almost 30 mph at 
times. 

The light precipitation is expected to come to an end this morning as
the system pulls away from the state. Some minor snow accumulations,
generally less than an inch remain possible in far south central to
southeast Iowa through mid morning, otherwise the north winds persist
for much of the day as cooler air arrives. Additional flurries are
expected late this afternoon into the evening as another weak system
passes through the state. 

Tonight and beyond: 

Any flurries are forecast to end tonight with clearing expected toward
daybreak on New Years Day. Mostly sunny skies will greet the New Year
with near normal temperatures in the mid 20s to lower 30s. However,
a clipper system approaches the state on Thursday with light snow
overspreading much of central into southern Iowa. Minor accumulations
are forecast by Thursday evening along with the arrival of cooler air.
Highs by Friday are forecast to remain in the teens to lower 20s over
much of the state as cold polar air overspread the Midwest. 

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

Precision Agriculture Weather Forecast For OBRIEN County


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Regional Hourly Observations For OBRIEN County
Issued at 100 AM CDT TUE AUG 18 2026

NORTHWEST IOWA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
CHEROKEE       CLOUDY    70  66  88 S6        29.98F TC  21           
DENISON        MOCLDY    68  68 100 CALM      30.03S TC  20           
ESTHERVILLE    MOCLDY    66  63  90 S7        29.96F TC  19           
LE MARS        MOCLDY    72  72 100 S8        29.98S TC  22           
MAURICE        MOCLDY    70  70 100 S6G12     29.99S TC  21           
SHELDON        CLOUDY    72  72 100 SW9       29.96S TC  22           
SIOUX CITY     LGT RAIN  71  68  90 S6        30.02R TC  22           
6HR MIN TEMP:  70; 6HR MAX TEMP:  81; 6HR PCP: TRACE;                

SPENCER        CLOUDY    70  65  84 SW7       29.98S TC  21           
6HR MIN TEMP:  68; 6HR MAX TEMP:  79;                                

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


Current Agricultural Weather Conditions in Iowa
Based on observations at 1200am CDT, Tuesday August 18, 2026

Across Iowa...temperatures are near 72 degrees west, near 72 degrees central, and near 67 degrees east. Current sky conditions are cloudy west, cloudy central, and clear east. In the west, relative humidity is near 84%, and the dew point is near 67 degrees. In the central part of the state, relative humidity is near 78%, and the dew point is near 65 degrees. In the east, relative humidity is near 87%, and the dew point is near 63 degrees. The livestock heat stress category is no stress west, no stress central, and no stress east. Winds are from the south at 5 mph west, where conditions are favorable for spraying. Winds are from the south at 5 mph central, where conditions are favorable for spraying. Winds are from the southwest at 6 mph east, where conditions are favorable for spraying. Based on current available observations, the highest temperature is 72 degrees at Sioux City and Des Moines. The lowest temperature is 62 degrees at Mason City.


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 OBRIEN County,IA

926 PM CDT Mon Aug 17 2026

 DAY ONE  Tonight.

Isolated to scattered thunderstorms may become strong to severe
producing 1 inch hail and wind gusts to 60 mph.

A second round of strong to severe storms is possible after midnight.
These storms could produce two inch hail and wind gusts to 70 mph. 

 DAYS TWO THROUGH SEVEN  Tuesday through Sunday.

Scattered thunderstorm risks continue through Wednesday. Severe 
storm risks remain focused mostly Tuesday afternoon and early
evening along and south of I-90.

 SPOTTER INFORMATION STATEMENT  

Spotter activation may be needed.

NWS Severe Weather Map , Convective Outlook


7-Day Forecast For OBRIEN County, IA
1209 AM CDT Tue Aug 18 2026

REST OF TONIGHT
Mostly cloudy with a chance of showers and thunderstorms. Near steady temperature in the mid 60s. Southwest winds 5 to 10 mph. Chance of rain 50 percent.

TUESDAY
Partly sunny. Showers likely with a chance of thunderstorms in the morning, then a slight chance of showers and thunderstorms in the afternoon. Humid with highs in the upper 70s. West winds around 5 mph. Chance of rain 60 percent.

TUESDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy after midnight. Humid with lows in the upper 50s. North winds around 5 mph, becoming east after midnight. Chance of rain 20 percent.

WEDNESDAY
Partly sunny. Highs in the upper 70s. Southeast winds around 5 mph.

WEDNESDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear after midnight. Lows in the upper 50s. South winds around 5 mph. Chance of rain 20 percent.

THURSDAY
Sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 20 percent.

THURSDAY NIGHT
Partly cloudy. A chance of showers and thunderstorms in the evening. Lows around 60. Chance of rain 30 percent.

FRIDAY
Partly sunny in the morning, then clearing. Highs around 80.

FRIDAY NIGHT
Mostly clear. Lows in the upper 50s.

SATURDAY
Sunny. Highs in the mid 70s.

SATURDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 50s.

SUNDAY
Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 70s.

SUNDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the upper 50s.

MONDAY
Partly sunny. Highs in the upper 70s.

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 
                   AUG 23-27 AUG 25-AUG 31    JUN       JUN-AUG                      
                 -----------  -----------  --------  ---------
   Temperature:      Above        Above                                            
 Precipitation:     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


Historical Weather And Climate Facts For Today

//////////////////////////
AUGUST 18TH...HISTORIC WEATHER EVENTS
...1925...
During the late morning hours a severe hailstorm struck southeastern Iowa
completely destroying crops along a path six to ten miles wide and 75 miles
long. The hail also injured and killed poultry and livestock, and caused a
total of 2.5 million dollars damage. The hailstorm flattened fields of corn
to such an extent that many had to leave their farms in search of other
work. It was one of the worst hailstorms of record for the nation. (The
Weather Channel)
...1983...
Hurricane Alicia, a category 3 storm made landfall near Galveston. Winds 
gusted to 130 mph with a storm surge of 12 feet. 22 tornadoes were spawned. 
Parts of Houston received 11 inches of rain. 12 people died and 1800 were 
injured. Total damage estimated at $3 billion.
(NWS Louisville)
...1987...
Thirteen cities in the eastern U.S. reported record high temperatures for
the date, including Orlando FL with a reading of 98 degrees, and Portland
ME with a high of 94 degrees. Newark NJ reached 90 degrees for the
thirty-sixth time of the year, their second highest total of record. (The
National Weather Summary)
...1988...
Twenty-two cities, from the Carolinas to the Upper Ohio Valley, reported
record high temperatures for the date, pushing the total number of daily
record highs since the first of June above the 1100 mark. Afternoon highs
of 102 degrees at Greensboro NC and 105 degrees at Raleigh NC equalled
all-time records. Evening thunderstorms in Montana produced wind gusts to
75 mph at Scobey. (The National Weather Summary) (Storm Data)
...1989...
Thunderstorms over the Middle Atlantic Coast Region and the Upper Ohio
Valley produced torrential rains in eastern Virginia during the late
morning and afternoon hours. Totals ranged up to twelve inches at Yorktown.
Williamsburg VA was deluged with 10.78 inches of rain between 6 AM and 10
AM, with 6.72 inches reported in just two hours. Flash flooding caused
nearly twelve million dollars damage in Accomack County VA. Early evening
thunderstorms in the Central High Plains Region produced walnut size hail
and wind gusts to 80 mph around Casper WY. Thunderstorms produced locally
heavy rains in the Yellowstone Park area, causing fifteen mudslides. (The
National Weather Summary) (Storm Data)
...1995...
At 1 pm Bowling Green recorded an exceptionally high dew point of 81 degrees.
(NWS Louisville)

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