National Weather Service United States Department of Commerce

This page can be used to plan for a particular weather hazard.

 

See the Latest Briefing Slides

 

For additional graphics see the PEMA Briefing Page

 

 Day 1 Max Temp

 

 

Today's Maximum Temperature

Map displays 24 hour Maximum Temperature for Day 1.

Map is updated every time the forecaster issues a new forecast.

 

 Day 2 Max Temp

 

Tomorrow's Maximum Temperature

Map displays 24 hour Maximum Temperature for Day 2.

Map is updated every time the forecaster issues a new forecast.

24-hour Day 1 Minimum Relative Humidity

Today's Minimum Relative Humidity

Map displays 24 hour minimum relative humidity values for Day 1.

Map is updated every time the forecaster issues a new forecast.

24 Hour Day 2 Minimum Relative Humidity

Tomorrow's Minimum Relative Humidity

Map displays 24 hour minimum relative humidity values for Day 2.

Map is updated every time the forecaster issues a new forecast.

 

     
Wind Gust  

Today's Maximum Wind Gust

 

Map is updated every time the forecaster issues a new forecast.

Wind Gust

24 Hour Maximum Heat Index Temperature

Map displays the maximum heat index temperature for the next 24 hours.

Map is updated every time the forecaster issues a new forecast.

       
Wind Gust

24 Hour Forecast Max Temperature Change

 

Shows the forecast max temperature change in the next 24 hours.

   
       

Storm Prediction Center Fire Outlook Day 1
Day 1 Fire Weather Discussion

Today's Outlook

The Day 1 Outlook covers the 24-hour period from 12Z on the morning of product issuance to 12Z the following morning, with the update covering the 19-hour period from 17Z at issuance to 12Z the following morning.

Storm Prediction Center Fire Outlook Day 2

Day 2 Fire Weather Discussion

Tomorrow's Outlook

The Day 2 Outlook covers the following 24-hour period after Day 1 out to 48 hours. The Day 2 Fire Weather Outlook is scheduled for issuance at 10Z and is updated at 20Z.

       

Storm Prediction Center Fire Outlook Days 3-8

Day 3-8 Fire Wx Discussion

Day 3-8 Outlook

The Day 3-8 Outlook covers the period of 48 to 192 hours from 12Z on the morning of product issuance. The Day 3-8 Fire Weather Outlook is scheduled for issuance at 22Z.

Short Range Ensemble Forecast (SREF) Products
use Firefox to view

Short-Range Ensemble Forecast (SREF)

Short-Range Ensemble Forecast  is produced by postprocessing the 21 members NCEP SREF plus the operational WRF-NAM for a total of 22 members. Special emphasis is placed on high-impact, mesoscale guidance including fire weather.

       

Weather Hazards MapHazards Assessment

Weather Hazards

Map displays active watch, warnings, advisories and short term forecasts in the lower 48 states. Map automatically refreshes every five minutes.

Loop of sea-level pressures and fronts through day 7

Surface Analysis

The Weather Prediction Center (WPC) produces surface maps which depicts the analysis of  highs, lows, fronts, troughs, outflow boundaries, squall lines, and drylines.
 

 

AHPS

 

River Forecast Points

Map displays river points in Central Pennsylvania.  Just click on the point where you want a forecast.

Map is updated every time a new observation or forecast is generated.

Mid Atlantic River Forecast Center

 

Observed Precipitation

 

Observed Precipitation

Map displays observed precipitation in the last 24 hours.

2-Day Total Precipitation

COOP 24 Hr     COOP 48 Hr

Public Reports

 

imgDay 1 Day 2 Day 3

 

National Rainfall Forecasts

 

National Rainfall Forecasts.  Mouse over each day for a quick view and click on the links to see a larger image for that day. 

 

img

Days 1-2   Days 1-3   Days 1-5

 

Multi-Day Rainfall Forecasts

 

Multi-Day National Rainfall Forecasts.  

2-Day, 3-Day, or 5-Day Total Amount

Mouse over each day for a quick view and click on the links to see a larger image for that day. 

       

 

24hr Forecasted QPF

 

24 Hour Total Precipitation Forecast

Map displays 24hr forecast precipitation amounts.

Map is updated every time the forecaster issues a new forecast.

 

2 Day Precipitation Forecast

 

Total Precipitation Forecast

Map displays a Storm Total forecast of precipitation amounts.

Map is updated every time the forecaster issues a new forecast.

 

forecast precipitation images

Periods: 1 2 3 4 5 6

 

6 Hour Precipitation Forecast

 

Map displays 6hr forecast precipitation amounts.

Mouse over each period for a quick view and click on the links to see a larger image for that period. 

 

 

forecast precipitation images

Periods: 1 2 3 4 5 6

 

6 Hour Precipitation Forecast for County Warning Area

Map displays 6hr forecast precipitation amounts for Central Pennsylvania.

Mouse over each period for a quick view and click on the links to see a larger image for that period. 

       

forecast precipitation images

Periods: 1 2 3

 

12 Hour Precipitation Forecast

 

Map displays 12hr forecast precipitation amounts.

Mouse over each period for a quick view and click on the links to see a larger image for that period. 

Rainfall Reports

 

Rainfall reports gathered from the public and social media for Pennsylvania and the surrounding area.  Also contains an archive of past storms.  

 

Locally produced map of Rainfall from PNS reports

       
forecast precipitation images

24 Hour Observed Precipitation

 

Map displays 24 hour observed precipitation amounts.

forecast precipitation images

48 Hour Observed Precipitation

 

Map displays 48 hour observed precipitation amounts.

       
forecast precipitation images

Month To Date Precipitation

 

Displays precipitation total from the first of the month to the current day.

forecast precipitation images

Monthly Precipitation from Previous Month

 

Displays 30 day precipitation total from the previous month.

       

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1 Hour    3 Hour   6 Hour

Flash Flood Guidance

Flash Flood Guidance is an estimate of the amount of rainfall required over a given area during a given duration to cause small streams to flood.

Mouse over each period for a quick view and click on the links to see a larger image for that period. 

Departure From Normal

Precipitation / Departure

 

Precipitation Departure from Normal

       
Hazards

Weather Hazards

Map displays active watch, warnings, advisories and short term forecasts in the lower 48 states. Map automatically refreshes every five minutes.

Significant Flood Outlook

Significant River Flood Outlook

ThisFlood Outlook is intended to provide a general outlook for significant river flooding. It is not intended to depict all areas of minor flooding or small-scale events such as localized flooding and/or flash flooding.
       
Historical Streamflow

Historical Streamflow

Map of real-time streamflow compared to historical streamflow for the day of the year.

Snow Analyses

National Snow Analyses

Includes data on snow water equivalent, snow depth and more. The data can be view for a day or animated for a two week period or a seaon.

CONUS & Mid Atlantic

 

24hr Max T

 

 

 

Today's Maximum Temperature

 

Map is updated every time the forecaster issues a new forecast.

 

Max T

 

Tomorrow's Maximum Temperature

Map displays the maximum temperature for day two.

Map is updated every time the forecaster issues a new forecast.

       
Max T

Day 3 Maximum Temperature

Map displays the maximum temperature for day three.

Map is updated every time the forecaster issues a new forecast.

Max T

24 Hour Maximum Heat Index Temperature

Map displays the maximum heat index temperature for the next 24 hours.

Map is updated every time the forecaster issues a new forecast.

Max T

24 Hour Forecast Max Temperature Change

 

Shows the forecast max temperature change in the next 24 hours

   
       

Weather Hazards MapHazards Assessment

Weather Hazards

Map displays active watch, warnings, advisories and short term forecasts in the lower 48 states. Map automatically refreshes every five minutes.

Loop of sea-level pressures and fronts through day 7

Surface Analysis

The Weather Prediction Center (WPC) produces surface

       

State College Radar

Pittsburgh Radar

Ohio Valley

Northeast

Convective Outlook

Day 1

 

Convective outlook  for organized severe thunderstorms over the region for Day 1.

Convective Outlook

Day 2

 

Convective outlook  for organized severe thunderstorms over the region for Day 2.

       

Convective Outlook

Day 3

 

Convective outlook  for organized severe thunderstorms over the region for Day 3.

Storm Prediction Center

Storm Prediction Center Overview Graphic / Map

Radar of the contiguous United States with Storm Prediction Center (SPC) products - Day 1.

SPC & its Products

       
       

SPC Outlook Day 1

About Convective Outlooks

Convection Outlooks 

Convective outlook  for organized severe thunderstorms over the contiguous United States.

Day 1 Outlook
Day 2 Outlook
Day 3 Outlook
Days 4-8 Outlook

Current Watches

About Severe Weather Watches

Current Watches

Graphic showing any severe thunderstorm and tornado watches which are in effect over the contiguous United States.

Severe & Tornado Watches

       

Latest Surface AnalysisNational Forecast Maps

Surface Analysis

The Weather Prediction Center (WPC) produces surface maps which depicts the analysis of  highs, lows, fronts, troughs, outflow boundaries, squall lines, and drylines.

Regional Observations
Rainfall Reports

Mesoscale Discussions

Mesoscale Discussions

Describe what is currently happening, what is expected in the next few hours, the meteorological reasoning for the forecast, and when / where SPC plans to issue the watch.

Current Mesoscale Discussions

       
Upper Air Sounding Map

Upper Air Soundings

Skew-T charts for all observed soundings across the United States. An archive of seven days of data is available.

Observed Soundings

Storm Reports

Monthly / Annual Summaries

Storm Reports

These reports are preliminary and are plotted and listed "as is" from NWS Local Storm Reports usually sent in realtime.

Preliminary Local Storm Reports for Central PA

       

Upper Air Map

Forecast Tools

Including upper air mapsupper air soundingsmesoanalysis graphics, Short-Range Ensemble Forecast (SREF), Storm-Scale Ensemble of Opportunity (SSEO) and Compmap.

SPC Mesoscale Sectors

Mesoscale Analysis

Nine fixed regional sectors and a national sector provide hourly gridded mesoanalysis graphics across the CONUS.

Northeast Sector

NHC Active Tropical Cyclones

Active Tropical Cyclones

Indicates areas/chances of tropical/sub-tropical cyclone development over the next 48  hours.

Atlantic Tropical Weather Discussion

NHC Data in GIS Formats

Graphical Tropical Weather Outlook

Graphical Tropical Weather Outlook

Highlights the location of areas of disturbed weather and shows the 48 hour probabilistic genesis potential.

Atlantic Tropical Weather Outlook

       

Tropical Cyclone Potential Impacts Graphics

Tropical Cyclone Potential Impacts

The TCI Graphics web site is an internet-based decision-support service consisting of at least four graphics: high wind impacts, coastal flooding impacts, inland flooding impacts, and tornado impacts.

Hurricane Local Statement - Interactive Text Reader

Hurricane Local Statement Interactive Text Reader

It is active whenever tropical cyclone watches/warnings are in effect locally, and refreshed with each issuance of the HLS by your local forecast office.

       

Tropical Atlantic Weather Map

Tropical Atlantic Weather Map

Surface analysis of weather features across the tropical Atlantic.

 Tropical Atlantic Infrared Satellite

Tropical Atlantic Satellite Imagery

NHC Aircraft Reconnaissance Plans & Data

       

Latest Surface AnalysisShort Range Forecast Maps

Surface Analysis

The Weather Prediction Center (WPC) produces surface maps which depicts the analysis of  highs, lows, fronts, troughs, outflow boundaries, squall lines, and drylines.

NOAA nowCOAST - GIS mapping Portal

Northeast Radar

Radar

WSR-88D Doppler Radar

State College | Sterling, VA
Dual-Pol Data | Training
Northeast Sector | Loop
Southeast Sector | Loop
Nationwide
| Loop

       

Weather Hazards Map

 

 

 

 

National Forecast Maps

Weather Hazards

Map displays active watch, warnings, advisories and short term forecasts in the lower 48 states. Map automatically refreshes every five minutes.

Loop of sea-level pressures and fronts through day 7

National Data Buoy Center

National Data Buoy Center

NDBC provides hourly observations from a network of about 90 buoys and 60 Coastal Marine Automated Network stations. All stations measure wind (speed/direction/gust) and barometric pressure and air temperature.

       

 

Storm Surge Products

Storm Surge

Along the coast, storm surge is often the greatest threat to life and property from a hurricane. The size of a storm surge for a particular location depends on a number of factors. Storm surge is very sensitive to the shape of the coast, and to changes in storm track, intensity, forward speed, and size. Tidal height at the time of maximum storm surge is an important factor.

Category

Winds
mph
Depression <39
T. Storm 39-73
Hurricane 1 74-95
Hurricane 2 96-110
Hurricane 3 111-129
Hurricane 4 130-156
Hurricane 5 > 156

Saffir-Simpson Hurricane Wind Scale

Category 1 to 5 rating based on a hurricane's sustained wind speed.

Effects and Damage Estimates

       

Number of Tropical Cyclones per 100 YearsTropical Cyclone Names

NWS JetStream
Tropical Weather

Tropical Cyclone Climatology

The official hurricane season for the Atlantic Basin (the Atlantic Ocean, the Caribbean Sea, and the Gulf of Mexico) is from June 1st to November 30th.

The peak of the season is from mid-August to late October. However, deadly hurricanes can occur anytime in the hurricane season.

Tropical Cyclones - pdf brochure Updated April 2013

Hurricane Tracks

Historical Hurricane Tracks

NOAA Historical Hurricane Tracks Tool - interactive database.

More than 6,000 tropical cyclones, ranging from 1842 and occurring in over seven major ocean basins around the world,  are now searchable thanks to the incorporation of NOAA’s International Best Track Archive for Climate Stewardship (IBTrACS) data set.

       

BTV Storm Total Snow

Storm Total Snow Forecast

Shows current Storm Total Snow forecast. 

Map is updated every time the forecaster issues a new forecast.

Storm Total Ice Forecast

Storm Total Ice Forecast

Shows current Storm Total Snow forecast. 

Map is updated every time the forecaster issues a new forecast.

       
       
Snowfall Reports

Locally produced map of Snowfall and Ice reports

 

Snowfall reports gathered from the public and social media for Central Pennsylvania.

 Also contains an archive of past storms.  

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Probability Snow and Ice

 

Shows the probability of Snow or Ice accumulation for various ranges of snow or ice for an impending storm. 

Displays minimum amount, maximum amount, and most likely amount snowfall graphics.

Updated 2 times per day.

Regional Snowfall Reports

 

Snowfall reports gathered from the public and social media for Pennsylvania and the surrounding area.

   
       

img
Period 1   Period 2   Period 3

12 Hour Snowfall Forecast

Shows forecast snowfall accumulations in 12 hour increments.

Mouse over each period for a quick view and click on the links to see a larger image for that period. 

Map is updated every time the forecaster issues a new forecast.

img

Period 1   Period 2   Period 3

12 Hour Ice Accumulation Forecast

Shows forecast ice accumulations in 12 hour increments.

Mouse over each period for a quick view and click on the links to see a larger image for that period. 

Map is updated every time the forecaster issues a new forecast

       

imgPeriod 1   Period 2  

24 Hour Snow Accumulation Forecast

Shows forecast snow accumulations in 24 hour increments for the next 2 periods.

Mouse over each period for a quick view and click on the links to see a larger image for that period. 

Map is updated every time the forecaster issues a new forecast.

24 Hour Ice Accumulation

24 Hour Ice Accumulation Forecast

Shows forecast ice accumulation for the next 24 hours.

Map is updated every time the forecaster issues a new forecast.

       
48 Hour Snow Accumulation

48 Hour Snowfall Forecast

Shows forecast snowfall for the next 48 hours.

Map is updated every time the forecaster issues a new forecast.

 

 

       
Max T

Today's Maximum Temperature

Map displays the maximum temperature for day one.

Map is updated every time the forecaster issues a new forecast.

Min Temp Day 1

Today's Minimum Temperature

Shows forecasted minimum temperature for the first day of the forecast.

Map is updated every time the forecaster issues a new forecast.

       
Max T

Tomorrow's Maximum Temperature

Map displays the maximum temperature for day two. Map gets updated every time the NWS in Burlington produces a new grid.

Map is updated every time the forecaster issues a new forecast.

Min Temp Day 1

Tomorrow's Minimum Temperature

Shows forecasted minimum temperature for the second day of the forecast.

Map is updated every time the forecaster issues a new forecast.

       
Windchill

24 Hour Minimum Windchill

Maps displays the lowest windchill in the next 24 hours.

Map is updated every time the forecaster issues a new forecast.

24 hour max wind gust

24 Hour Maximum Wind Gust

Map display the highest wind gusts expected in the next 24 hours

Map is updated every time the forecaster issues a new forecast.

       
Max T

24 Hour Forecast Max Temperature Change

 

Shows the forecast max temperature change in the next 24 hours

   
       

State College Radar

Pittsburgh Radar

Ohio Valley

Northeast

       

National Snow Analyses

U.S. Snow Monitoring

National Snow Analyses

Includes data on snow water equivalent, snow depth and more. The data can be view for a day or animated for a two week period or a season.

CONUS & Mid Atlantic

Hourly Weather Graph

Hourly Weather Graph

Shows hourly information for locations across Pennsylvania.

 

Overview of Storm Total  Forecasts

 

Storm Total QPF Forecast

Storm Total QPF Forecast

Map shows the expected storm total precipitation.


Map is updated several times per day.


BTV Storm Total Snow

Storm Total Snow Forecast

Map shows the expected storm total snowfall.


Map is updated several times per day.

Storm Total Ice Forecast

Storm Total IceAccum Forecast

Maps shows the expected storm total ice accumulation.


Map is updated several times per day.

 

 

     

 

 

QPF Forecasts

 

12 Hour QPF Forecast - Period 1

12 Hour QPF Forecast
- Period 1

 
Map is updated
once per hour.

Storm Total QPF Forecast

Storm Total QPF Forecast

Map shows the expected storm total precipitation.


Map is updated several times per day.

12 Hour QPF Forecast - Period 2

12 Hour QPF Forecast
- Period 2

 
Map is updated
once per hour.

24 Hour QPF Forecast

24 Hour QPF Forecast

 
Map is updated
once per hour.

12 Hour QPF Forecast - Period 3

12 Hour QPF Forecast
- Period 3

 
Map is updated
once per hour.


48 Hour QPF Forecast

48 Hour QPF Forecast

 
Map is updated
once per hour.

12 Hour QPF Forecast - Period 4

12 Hour QPF Forecast
- Period 4

 
Map is updated
once per hour.

   
12 Hour QPF Forecast - Period 5

12 Hour QPF Forecast
- Period 5

 
Map is updated
once per hour.

 

 

12 Hour QPF Forecast - Period 6

12 Hour QPF Forecast
- Period 6

 
Map is updated
once per hour.

 

 

 

Snow Amount Forecasts

 

12 Hour Snow Forecast - Period 1

12 Hour Snow Forecast
- Period 1

 
Map is updated
once per hour.

BTV Storm Total Snow

Storm Total Snow Forecast

Map shows the expected storm total snowfall.

 
Map is updated several times per day.

12 Hour Snow Forecast - Period 2

12 Hour Snow Forecast
- Period 2

 
Map is updated
once per hour.

24 Hour Snow Forecast

24 Hour Snow Forecast

 
Map is updated
once per hour.

12 Hour Snow Forecast - Period 3

12 Hour Snow Forecast
- Period 3

 
Map is updated
once per hour.


48 Hour Snow Forecast

48 Hour Snow Forecast

 
Map is updated
once per hour.

12 Hour Snow Forecast - Period 4

12 Hour Snow Forecast
- Period 4

 
Map is updated
once per hour.

   
12 Hour Snow Forecast - Period 5

12 Hour Snow Forecast
- Period 5

 
Map is updated
once per hour.

 

 

12 Hour Snow Forecast - Period 5

12 Hour Snow Forecast
- Period 6

 
Map is updated
once per hour.

 

Ice Accumulation Forecasts

 

12 Hour IceAccum Forecast - Period 1

12 Hour IceAccum Forecast
- Period 1

 
Map is updated
once per hour.

Storm Total Ice Forecast

Storm Total IceAccum Forecast

Map shows the expected storm total ice accumulation.

 
Map is updated several times per day.

12 Hour IceAccum Forecast - Period 2

12 Hour IceAccum Forecast
- Period 2

 
Map is updated
once per hour.

24 Hour IceAccum Forecast

24 Hour IceAccum Forecast

 
Map is updated
once per hour.

12 Hour IceAccum Forecast - Period 3

12 Hour IceAccum Forecast
- Period 3

 
Map is updated
once per hour.


48 Hour IceAccum Forecast

48 Hour IceAccum Forecast

 
Map is updated
once per hour.

12 Hour IceAccum Forecast - Period 4

12 Hour IceAccum Forecast
- Period 4

 
Map is updated
once per hour.

   
12 Hour IceAccum Forecast - Period 5

12 Hour IceAccum Forecast
- Period 5

 
Map is updated
once per hour.