Spearfish, South Dakota Weather Conditions

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Current Conditions

  • 84°
  • Clear
  • Wind: East 16 mph
  • Humidity: 45%
  • Visibility: 10.0 miles
  • Dew Point: 61°
  • Pressure: 30.24 in. +
  • Heat Index: 84

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Next 12 Hours

4  pm
7  pm
10  pm
1  am
4  am
Thunderstorm
T-storms
Thunderstorm
T-storms
Partly Cloudy
Partly Cloudy
Clear
Clear
Partly Cloudy
Partly Cloudy
81°
79°
72°
68°
68°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Thunderstorm
  • High: 84 °
  • Low: 63 °
  • T-Storms
  • Wednesday
  • Chance of a Thunderstorm
  • High: 90 °
  • Low: 64 °
  • Chance of a Thunderstorm
  • Thursday
  • Chance of a Thunderstorm
  • High: 91 °
  • Low: 57 °
  • Chance of a Thunderstorm
  • Friday
  • Clear
  • High: 79 °
  • Low: 59 °
  • Clear
  • Saturday
  • Clear
  • High: 79 °
  • Low: 55 °
  • Clear

Forecast for Spearfish, South Dakota

Updated: 4:00 PM CDT on July 22, 2014

  • Tuesday

    Clear with thunderstorms and rain showers in the afternoon. High of 82F. Winds from the North at 5 to 10 mph shifting to the ENE in the afternoon. Chance of rain 50%.

  • Tuesday Night

    Partly cloudy with thunderstorms and rain showers. Low of 63F. Winds from the ESE at 5 to 15 mph.

  • Wednesday

    Clear with a chance of a thunderstorm and a chance of rain in the afternoon. High of 90F. Winds from the SE at 5 to 20 mph. Chance of rain 20%.

  • Wednesday Night

    Partly cloudy with a chance of a thunderstorm and a chance of rain. Low of 64F. Breezy. Winds from the SSE at 10 to 20 mph. Chance of rain 30%.

  • Thursday

    Partly cloudy in the morning, then clear with a chance of a thunderstorm and a chance of rain. High of 91F. Winds from the SW at 5 to 15 mph shifting to the NW in the afternoon. Chance of rain 20%.

  • Thursday Night

    Partly cloudy with a chance of a thunderstorm and a chance of rain. Low of 57F. Winds from the ENE at 10 to 15 mph shifting to the WNW after midnight.

  • Friday

    Clear. High of 79F. Winds from the NW at 5 to 15 mph.

  • Friday Night

    Clear. Low of 59F. Winds from the NNE at 5 to 15 mph shifting to the NW after midnight.

  • Saturday

    Clear. High of 79F. Breezy. Winds from the NW at 15 to 25 mph.

  • Saturday Night

    Clear. Low of 55F. Breezy. Winds from the NNW at 5 to 25 mph.

  • Sunday

    Clear. High of 73F. Winds from the North at 5 to 10 mph.

  • Sunday Night

    Clear. Low of 55F. Winds from the East at 5 to 10 mph shifting to the SSE after midnight.

  • Monday

    Clear. High of 77F. Winds from the SSE at 5 to 10 mph shifting to the East in the afternoon.

  • Monday Night

    Clear. Low of 55F. Winds from the SE at 10 to 15 mph.

  • Tuesday

    Partly cloudy with a chance of a thunderstorm. High of 79F. Winds from the ESE at 5 to 10 mph. Chance of rain 20%.

  • Tuesday Night

    Clear with a chance of a thunderstorm. Low of 57F. Winds from the SE at 5 to 15 mph. Chance of rain 40%.

  • Wednesday

    Clear. High of 77F. Winds less than 5 mph.

  • Wednesday Night

    Partly cloudy. Low of 57F. Winds from the ESE at 5 to 10 mph.

  • Thursday

    Partly cloudy. High of 75F. Winds less than 5 mph.

  • Thursday Night

    Partly cloudy. Low of 57F. Winds less than 5 mph.

  • Friday

    Partly cloudy. High of 75F. Winds less than 5 mph.

  • Friday Night

    Partly cloudy with a chance of a thunderstorm. Low of 59F. Winds less than 5 mph. Chance of rain 50%.

  • Saturday

    Clear with a chance of a thunderstorm. High of 86F. Winds less than 5 mph. Chance of rain 30%.

  • Saturday Night

    Clear. Low of 59F. Winds less than 5 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: TMWC, Spearfish, SD

Updated: 1:42 PM MDT

Temperature: 83.3 °F Dew Point: 60 °F Humidity: 46% Wind: ESE at 5.8 mph Pressure: 30.07 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

Location: Mountain Plains I, Spearfish, SD

Updated: 1:40 PM MDT

Temperature: 86.0 °F Dew Point: 57 °F Humidity: 37% Wind: ESE at 5.4 mph Pressure: 30.36 in Hourly Precipitation: 0.00 in Heat Index: 85 °F Graphs

Location: County Road 172, Sundance, WY

Updated: 1:29 PM MDT

Temperature: 86.6 °F Dew Point: 59 °F Humidity: 39% Wind: SSE at 4.0 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Wharf, Lead, SD

Updated: 1:17 PM MDT

Temperature: 70.4 °F Dew Point: -4 °F Humidity: 5% Wind: North at 3.0 mph Pressure: 30.24 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: RAWS ADAMS WEATHER STATION WY US, Lead, SD

Updated: 1:09 PM MDT

Temperature: 83 °F Dew Point: 54 °F Humidity: 37% Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: 82 °F Graphs

Location: Dumont Trailhead, Lead, SD

Updated: 1:38 PM MDT

Temperature: 73.7 °F Dew Point: 60 °F Humidity: 62% Wind: ENE at 1.0 mph Pressure: 30.29 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion for western South Dakota and northeastern Wyoming 
National Weather Service Rapid City South Dakota 
1119 am MDT Tuesday Jul 22 2014 


Update... 
issued at 929 am MDT Tuesday Jul 22 2014 


Updated forecast to remove probability of precipitation from the rest of the morning period. 
Otherwise the forecast remains on track. 


&& 


Short term...today through Wednesday night 
issued at 218 am MDT Tuesday Jul 22 2014 


08z surface analysis had cool front from central Montana into central 
Wyoming and then east through northern NE. Water vapour showed upper 
ridge over The Four Corners area with heights starting to rise 
over the County Warning Area and several weak waves rotating around it from Wyoming 
into the Dakotas. One wave kicked off a small cluster of thunderstorms and rain 
moving into central South Dakota and another over central Wyoming...heading 
northeast. Will make last minute changes to package to account for 
these wiggles. 


Today/early this evening...surface ridge builds back into Wyoming/Montana as 
surface high slides east of the County Warning Area into the upper Midwest. Return 
flow on back side of high will morph western end of cool front into 
Lee trough as it moves northeast today to sit from central Montana into 
the NE Panhandle. Upslope flow pools moisture along boundary 
resulting in 1-2kj/kg MLCAPE and weakening mlcin...especially over 
the higher terrain...by mid-afternoon. 0-6km shear increases to 
20-30m/S as 40kt middle-level northwesterly winds combine with 10kt 
east/southeast boundary layer flow. Main question is whether low 
level convergence/terrain influence can overcome lack of a clear 
shortwave and building heights. Suspect we/ll see a couple of 
supercells tied to terrain/low level convergence features by late 
afternoon...but then quickly dying around sunset. Local WRF seems to 
support this scenario. Large hail will be the main threat...but as 
storms collapse damaging winds possible. Temperatures will be 5-15f 
cooler than yesterday given lower tropospheric forecast soundings. 


Overnight...upper level ridge continues to build over County Warning Area with 
mainly dry weather expected. Lows near guidance. 


Wednesday...upper/thermal ridge over the northern plains with 
shortwave moving from Nevada into Montana/Wyoming creating low pressure along Lee 
trough in central WY/Mt. Narrow ribbon of 2-3kj/kg MLCAPE develops 
from southeast Montana into the NE Panhandle...intersecting the Black 
Hills. Low level southeasterly flows pick up noticeably with 
15-25m/S 0-6km bulk shear. Shortwave should move into County Warning Area during 
peak heating and create isolated severe thunderstorms and rain. Interesting feature 
with this setup is persistent moisture convergence along easterly 
slopes of Black Hills and supercell forecast movement less than 
10kts over terrain/adjacent plains. Precipitable waters surpass 150 
percent of normal. Possible flash flood event setting up...but will 
hold off on any headlines until timing of features becomes clearer. 
Temperatures will warm up some...and could be quite warm Wednesday 
night given 30-40kt low level jet. 


&& 


Long term...Thursday through Monday 
issued at 218 am MDT Tuesday Jul 22 2014 


Upper-level ridge will remain over The Rockies and High Plains 
during the middle and latter part of the week...with very warm 
conditions persisting. A strong upper trough will slide across 
southern Canada...with weaker energy crossing the northern plains 
on Thursday. This will bring a chance of thunderstorms to the 
area. As the upper trough slides east...the upper ridge will 
retrograde west...bringing predominantly northwest upper flow to 
the northern plains. This will result in cooler temperatures for 
the rest of the extended period...along with mainly dry 
conditions. 


&& 


Aviation...for the 18z tafs through 18z Wednesday 
issued at 1119 am MDT Tuesday Jul 22 2014 


Mostly VFR conditions are expected through the forecast period. 
There is a chance for showers and thunderstorms across much of the 
area from middle afternoon through late tonight. Some thunderstorms may 
be severe late this afternoon and into this evening. 


&& 


Unr watches/warnings/advisories... 
South Dakota...none. 
Wyoming...none. 
&& 


$$ 


Update...10 
short term...helgeson 
long term...15 
aviation...26 












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