National Forecasts
For more detail on the quantity of precipitation expected and the potential for excessive rain that could cause flooding, go to the NWS Hydrometeorological Prediction Center (HPC) Website (http://www.hpc.ncep.noaa.gov/) and select the Quantitative Precipitation Forecast (QPF) graphic (example below). These graphics give precipitation forecasts for various time periods up to a 5–day total.
Example plot of 24-hour forecasted precipitation quantities (QPF).
HPC provides guidance, analysis, forecast products, real-time weather model diagnostics discussions, and surface pressure and frontal analyses. Additionally, when NHC drops responsibility for a tropical system after it makes landfall, HPC takes responsibility for issuing public advisories four times a day.
Below is an example of an HPC public advisory for the inland remnants of a tropical storm.
PUBLIC ADVISORY NUMBER 29 FOR REMNANTS OF IDA NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD AL112009 1000 PM EST TUE NOV 10 2009 ...TROPICAL RAINS SPREAD NORTHEAST ACROSS THE MID-ATLANTIC... FLOOD AND FLASH FLOOD WATCHES...WARNINGS...AND ADVISORIES REMAIN IN EFFECT ALONG PORTIONS OF THE GULF COAST...NORTHEASTWARD ACROSS THE SOUTHEAST...AND NORTHWARD INTO THE MID-ATLANTIC AND TENNESSEE VALLEY. WIND AND LAKE WIND ADVISORIES ARE IN EFFECT ACROSS THE SOUTHEASTERN UNITED STATES. FOR INFORMATION SPECIFIC TO YOUR AREA...INCLUDING POSSIBLE WATCHES AND WARNINGS...PLEASE MONITOR PRODUCTS ISSUED BY YOUR LOCAL NATIONAL WEATHER SERVICE OFFICE AT WWW.WEATHER.GOV. AT 1000 PM EST...0300 UTC...THE CENTER OF REMNANTS OF IDA WAS LOCATED NEAR LATITUDE 30.8 NORTH...AND LONGITUDE 85.3 WEST...OR 60 MILES...95 KM...WEST-NORTHWEST OF TALLAHASSEE FLORIDA AND 120 MILES...195 KM...SOUTH OF COLUMBUS GEORGIA. THE LOW PRESSURE CENTER WILL CONTINUE ITS EASTWARD TRACK ALONG THE FLORIDA PANHANDLE TUESDAY NIGHT. BY THURSDAY MORNING...THE LOW IS EXPECTED TO REDEVELOP AND STRENGTHEN OFF THE CAROLINA COAST. MAXIMUM SUSTAINED WINDS ARE NEAR 20 MPH...30 KM/HR...WITH HIGHER GUSTS. THE MINIMUM CENTRAL PRESSURE IS 1006 MB...29.71 INCHES. SELECTED STORM TOTAL RAINFALL IN INCHES THROUGH 10 PM EST ...ALABAMA... FOLEY 0.5 ESE 6.61 SUMMERDALE 2.5 ESE 6.13 ELBERTA 3.1 SSW 5.84 BREWTON 3 SSE 5.50 ATMORE 12 N 5.41 OPELIKA 11.0 S 5.40 . .[deleted locations for brevity] . ...MISSISSIPPI... WIGGINS 6 E 4.08 WAYNESBORO 2 W 4.05 PASCAGOULA 3 NE 3.42 VANCLEAVE 4.1 NNW 3.34 NEW AUGUSTA 1 N 3.28 OCEAN SPRINGS 3.3 E 3.24 MOSS POINT 10.2 NE 3.10 BUCKATUNNA 3.10 SHUBUTA 2.98 CRANDALL 12 N 2.95 KEESLER AFB/BILOXI 2.49 BY THURSDAY EVENING...ADDITIONAL RAINFALL AMOUNTS OF 4 TO 8 INCHES...WITH ISOLATED AMOUNTS OF UP TO 12 INCHES...ARE EXPECTED ACROSS THE SOUTHEAST AND INTO THE MID-ATLANTIC. ...SUMMARY OF 1000 PM EST INFORMATION... LOCATION...30.8N 85.3W MAXIMUM SUSTAINED WINDS...20 MPH PRESENT MOVEMENT...EAST OR 090 DEGREES AT 16 MPH MINIMUM CENTRAL PRESSURE...1006 MB THE NEXT ADVISORY ON THIS SYSTEM WILL BE ISSUED BY THE HYDROMETEOROLOGICAL PREDICTION CENTER AT 400 AM EST. PLEASE REFER TO YOUR LOCAL NATIONAL WEATHER SERVICE OFFICE FOR FURTHER INFORMATION ON THIS STORM. GERHARDT FORECAST POSITIONS INITIAL 11/0300Z 30.8N 85.3W 12HR VT 11/1200Z 30.8N 84.3W...EXTRATROPICAL 24HR VT 12/0000Z 31.7N 79.7W...EXTRATROPICAL 36HR VT 12/1200Z 33.1N 77.3W...EXTRATROPICAL 48HR VT 13/0000Z 33.5N 76.0W...EXTRATROPICAL |