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Paul J. Hebert and Staff NHC
Hovermale J. B. 1975: First season storm movement characteristics of the NMC objective hurricane forecast model. Minutes of the NOAA.
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NOAA Technical Memorandum NWS NHC 4
ANNVAL DATA AND VERIFICATION TABULATION
ATLANTIC TROPICAL CYCLONES 1976
Paul J. Hebert and Staff, NHC
National Hurricane Center
Miami, Florida
May 1977
927UNITED STATES
DEPARTMENT OF COMMERCE
Juanita M. Kreps. Secretary
/NATIONAL OCEANIC AND/N~tlOnJI WeatherATMOSPHERIC ADMINISTRATION Ser,.ce
Robert Y. White. AdminIstrator Ceoree P Clessman. DirectorINTRODUCTION
This is the third report of an annual series prepared by the National Hurricane Center (NHC) to provide a source of summarized data on Atlantic It will not duplicate the narrative overview of the tropical cyclones. hurricane season and the description of the individual storms, which will continue to be published in the Monthly Weather Review. In addition to data supplied by the National Weather Service, materials have been furnished by the NOAA National Environmental Satellite Services (NESS) Miami office, and the CARCAH (Chief Aerial Reconnaissance Coordination, allHurricanes).
OBJECTIVE FORECAST TECHNIQUES
The follo~ing tropical cyclo~e prediction models were used at the National Hurricane Center for forecasting moJlon on an operational basis:A stepwise screening regression
NHC-67 (Miller, Hill, Chase, 1968).
1. model using predictors derived from the current and 24-hour old 1000,700, and 500 rob data, and includes persistence during the early fore-
cast periods.A filtered barotropic model usin~
SAN BAR (Sanders and Burpee, 1968).
2. input data derived from the 1000 to 100 mb pressure weighted winds. .The model requires the use of "bogus" data in data-void areas. The system was modified by Pike, (1972) so that the initial wind fie1ri near the storm would conform to the current storm motion.An analog system using as a data
HURRAN (Hope and Neumann, 1970).
3. base the tracks of all Atlantic tropical storms and hurricanes dating back to 1886Stepwise multiple screening regression using
CLIPER (Neumann, 1972).
4. the predictors derived from climatology and persistence.A modified stepwise multiple
NHC-Z2 (Neumann. Hope. Miller. I972).
5. screening regression system wh~ch combines the NHC-67 concept and the CLIPER system into a single model.Similar in concept to the NHC-
NHC-r3 (Neumann and Lawrence, 1973).
6.72 except it also uses the "perfect prog" and Mas (model output statis-
tics) methods to introduce NMC (National Meteorological Center) numer- ical prognostic data into the prediction equations.A ten-level baroclinic model which
~c MFM MODEL (Hovermale, 1975). 7 uses a moving fine mesh (MFM) grid nested within the coarser NMC fixedIt is capable of predicting both
grid primitive equation (PE) model. track and intensity changes. The National Hurricane Center uses the above models as guidance in theThe hurricane forecaster also makes extensive use
formulation of its forecasts. of analyses and prognoses produced by NMC and RCTM (Regional Center for TropicalMeteorology) in Miami.
VERIFICATION
Verification statistics for the 1976 season are shown in Table 1 (Pelissier, The initial position error in Table 1 is the difference between the1975).
operational initial position and that determined during post analysis (best tra~k The forecast displacement error is the vector difference between the position). forecast displacement and the actual displacement computed from best-trackpositions. The la~dfall prediction error for the official forecasts is given It is defined as the distance from the predicted landfall point. in Table 2. made 24 hours prior to actual landfall, to the actual landfall point.In cases
where a storm either crossed an island or made landfall when predicted to remain offshore, the error was designated as the distance from the landfall point to the nearest point on the forecast track. 2 A summary of 1976 North Atlantic tropical cyclone statistics is given in Table 3.Tracks of 1976 named storms are shown in Figure 1
The best track. initial. and forecast positions for 1976 named storms are in Table 4, along with initial position and forecast errors. Table 5 lists all center fix positions and intensity evaluations used operationally at the National Hurricane Center during 1976.Fixes are in
~I chronological order, and include those obtained by aerial reconnaissance penetrations and radar, satellite (Miami SFSS), and land-based radar. Table 6 is an aerial reconnaissance summary for the 1976 season. A number of vortex projiles constructed from data obtained by aerial reconnaissance are shown in 'Figure 2.These profiles show win9s, temperatures,
dew-P?ints, D-values, and weather in the four quadrants of the storms at speci-fied distances from the center out to 80 n.mi. They are produced operationally.-The plotting model along with a diagram of the
on the NHC Varian computer. paths flown in obtaining the vortex profiles is given in Figure 3. Graphs of the lowest central pressure vs. time for 1976 tropical cyclones are in Figure 4 Daily SMS-1 satellite photographs of 1976 named tropical cyclones are inFigure 5.
Selected radar photographs of Belle are in Figure 6. 3ACKNOWLEDGMENTS
Ms. Dorothy Mixon and Ms. Wanda Lund, who
Main contributers were:
listed the center fixes in chronological order; Ms. Mary Watson, who did the pressure-time graphs; Ms. Lilias Wilson, who typed the tables and manuscript; Dr. Joseph Pelissier, who computed the verification statistics; the NHC Data Automation Section, which furnished the vortex profiles; and James Eskdale, who composited the satellite and radar photographs. 4REFERENCES
Hope, J. R. and C. J. Neumann, 1970: "An Operational Technique for Relating the Movement of Existing Tropical Cyclones to P~st Tracks," Monthly Weather Review, Vol. 98, No. 23, pp. 925-933. Hovermale, J. B. 1975: First season storm movement characteristics of the NMC objective hurricane forecast model. Minutes of the NOAA Hurricane Warning Conference, National Hurricane Center, CoralGables, Florida.
Miller, B. I., E. C. Hill and P. P. Chase, 1968: "Revised Technique for Forecasting Hurricane Motion by Statistical Methods, "MonthlyWea~her Rev_!ew. Vol. 96, No.8, pp. 540-548
Neumann, C. J., 1972: "An Alternate to the HURRAN Tropical CycloneForecast System", ~ Technical Memorandum NWS SR-62, 24 pp.
J. R. Hope and B. I. Miller, 1972: itA Statistical Method of Combining Synoptic and Empirical Tropical Cyclone ~rediction Systems", BQM. Technical Memorandum NWS SR-63, 32 pp. and M. B. Lawrence, 1973: "Statistical-Dynamical Prediction of Tropical Cyclone Motion (NHC-73)", ~ Technical Memorandum NWSSR-69, 34 pp.
Pike, A. C., 1972: "Improved Barotropic Hurricane Track Prediction by Adjustment of the Initial Wind Field", NOAA Technical MemorandumNWS SR-66, 16 pp.
Sanders, F., and R. W. Burpee, 1968: "Experiments in Barotropic Hurri- cane Track Forecasting", Journal2!;.. Applied Meteorology, Vol. 7,No.3, pp. 313-323.
Pelissier. J. M.. 1975: Minutes of the NOAA Hurricane Warning Conference.National Hurricane Center, Coral Gables, Florida.
5LIST OF FIGURES AND TABLES
Tracks of 1976 tropical cyclones.
Figure 1..
Vortex profiles, 1976 tropical cyclones.
Figure 2.
Data plotting model and flight pattern flown in obtaining vortex profiles.Figure 3.
Lowest pressure vs. time, 1976 tropical cyclones
Figure 4.
Daily satellite photographs of 1976 tropical storms andhurricanes.Figure 5.
Selected radar photographs of Belle.
Figure 6.
Verification of 1976 tropical storm and hurricane forecastsFigures in parenthesis are the number of cases.
Table 1.
Landfall errors of 1976 tropical storms and hurricanesTable 2.
Summary of 1976 tropical cyclone statistics
Table 3.
Best track, initial and forecast positions, initial position error and forecast errors for 1976 tropical cyclones.Table 4.
Center fix positions and intensity evaluations for 1976 tropical cyclones.Table 5.
Aerial Weather Reconnaissance summary for 1976 hurricane season (Atlantic and Pacific).Table 6.
6 7 5 r--,,; :'01.;..' ~j!~,t.i~'~ . II) gM~ r;;t ()ori E-M+> ..0t'-~II)~Ucd~
.M jr.z.Vortex profiles, 1976 tropical cyclones.
Figure 2.
8Figure 2 continued.
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