Below is a list of weather applications that our members have recommended. Along with some pro/cons.

Radar Applications

GRLevel3
Description: Level3 NEXRAD Radar display
Requires: WindowsXP or higher
Pros: Allows shapefiles to be placed under the radar image, allowing you to see roads, water features, etc. Also will display NWS watch and warning areas.
Cons: Requires internet connection
Price: $80 one-time
Example: Greenville GRLevel3 Radar (requires flash)

Storm Predator
Description: Level3 NEXRAD Radar display
Requires: WindowsXP or higher
Pros: Allows PNG images to be placed under the radar image, storm track ETA, add-ons for external alerting (phone, email, etc).
Cons: Requires internet connection, adding roads and other features significantly harder than GRLevel3.
Price: $40 download, $50 for CD one-time
Example: Hurricane Isabel animation

StormLab
Description: Level3 NEXRAD Radar display
Requires: WindowsXP or higher
Pros: Allows shapefiles to be placed under the radar image, allowing you to see roads, water features, etc. Also will display NWS watch and warning areas.
Cons: Requires internet connection.
Price: $75 - $150 depending on package, one-time
Example: Screenshots

InterWarn
Description: Add-on for StormLab for watches and warnings, alerts via email or texts to your phone
Requires: WindowsXP or higher
Pros: Will display NWS watch and warning areas, can be used with EMWIN systems not reuiring internet connection (see below).
Cons: Requires internet connection.
Price: $75 - $150 depending on package, one-time (See StormLab above)
Example: Screenshots

Web-based Applications

WeatherTap
Description: Multiple services
Requires: Modern browser, or supported smart phone.
Pros: Unknown, unable to see anything without subscription.
Cons: Requires internet connection, web access.
Price: $8/month subscription

F5Data
Description: Multiple services
Requires: WindowsXP or higher
Pros: Unknown, unable to see anything without subscription.
Cons: Requires internet connection.
Price: $Free - $20/month subscription depending on options.
Example: Features & Screenshots

WeatherUnderground
Description: Multiple services
Requires: Internet connection, modern browser.
Pros: Free and open website.
Cons: N/A
Price: $Free

Smart phone-based Applications

USRadarHD/Radar Pro
Description: Radar Display
Requires: iPhone/iPad
Pros: Runs on your iPhone.
Cons: Runs on your iPhone.
Price: $5.
Example: iTunes review page

RadarScope
Description: Radar Display
Requires: Mac/iPhone/iPad or Android
Pros: Runs on multiple platforms.
Cons: Requires internet connection, still in early development.
Price: $30 for Mac, $10 iPhone/iPad/Android.
Example: iTunes review page

PYKL3
Description: Radar and Warning Display
Requires: Android
Pros: Requires Android.
Cons: Requires Android.
Price: $10 Android.

Other software

WxMesg
Description: Alerting program, provides alerts to phones, email, pager, twitter and other means
Requires: WindowsXP or higher
Pros: Full alerting capabilities, only one user needs to buy the software.
Cons: Requires internet connection.
Price: $50 one-time for 50 users.

Weather stations and software

Davis Vantage Pro 2
Description: Weather station which reports rain, temperature and humidity (in/outdoor), wind speed and direction, barometer.
Requires: Nothing.
Pros: Considered the "Gold Standard" in home weather stations, is capable of providing data via RF from local APRS broadcast, to CWOP, and to additional locations with add-on software. Excellent support. (As an owner of this station, I was fully impressed with the $112 overhaul for a station that had been through at least 5 hurricanes and two snow and ice storms).
Cons: Expensive.
Price: $600 - $1200 depending on options.
Example: CW4149

Oregon Scientific WMR200
Description: Weather station which reports rain, temperature and humidity (in/outdoor), wind speed and direction, barometer
Requires: Nothing.
Pros: Capable of providing data to CWOP, and to additional locations with add-on software.
Cons: Unknown.
Price: $400.

wview
Description: Software that connects to your weather station and provides additional capabilities
Requires: Linux or Mac OSX machine, Apache.
Pros: Fully configurable, supports many different weather stations.
Cons: No GUI interface.
Price: $Free.
Example: CW4149

Virtual Weather Station
Description: Software that connects to your weather station and provides additional capabilities
Requires: Win98 or higher.
Pros: Supports many different weather stations.
Cons: GUI interface.
Price: $47 - $100 depending on version.

EMWIN

Emergency Managers Weather Information Network is a suite of data access methods which make available a live stream of weather and other critical emergency information. Each method has unique advantages. EMWIN's present methods in use or under development for disseminating the basic datastream include radio, internet, and satellite.
Many of the systems above use the EMWIN internet feed for their data, their is no local (GSP area) radio available, which leaves the satellite system(s) listed below.

EMWIN2
Description: Complete Satellite receive system, does NOT include computer or software
Requires: Seperate computer and software
Pros: Not tied to the internet, off-grid use.
Cons: Expensive.
Price: $2000 one-time.

NOAAPort

NOAAPort is a significantly more detailed data feed than EMWIN. For your average user, NOAAPort is overkill and is mentioned here just for completeness.

Map Of The Upstate SC Warning Area.
National Weather Service - GSP