592 
 WTPZ44 KNHC 052041
 TCDEP4
 
 HURRICANE NORBERT DISCUSSION NUMBER  14
 NWS NATIONAL HURRICANE CENTER MIAMI FL       EP142014
 200 PM PDT FRI SEP 05 2014
 
 Even though Norbert's cloud pattern remains fairly well organized in
 satellite imagery, cloud top temperatures in the central dense
 overcast have been slowly warming since this morning. Nevertheless,
 an Air Force Reserve Unit Hurricane Hunter aircraft reported maximum
 flight-level winds of 92 kt and peak SFMR winds of 76 kt in the
 northeastern quadrant, with a minimum pressure of 966 mb. These data
 support an initial intensity estimate of 80 kt for this advisory.
 
 While Norbert will be moving over above-normal SSTs of 27-29 deg C
 west of the southern Baja California peninsula during the next day
 or so, some northeasterly shear and an influx of drier and more
 stable air over the western part of circulation should contribute to
 a slow weakening. After that time, Norbert should reach
 substantially cooler waters and other thermodynamic variables should
 become much less favorable. These negative factors should result in
 a near-rapid weakening of the cyclone in 2-3 days, and remnant low
 status is forecast in 3 days. Encountering even cooler waters on
 day 4-5 and an increase in shear, Norbert should spin down further
 and dissipate just beyond the end of the forecast period. The NHC
 intensity forecast has not changed from the previous one and is near
 the multi-model consensus IVCN.
 
 Satellite and aircraft fixes indicate an initial motion toward the
 northwest or 325/7 kt. Some re-building of the mid-level ridge to
 the north of Norbert should cause a slight bend of the track toward
 the left during the next day or two.  After that time, Norbert is
 expected to reach the western edge of the ridge and encounter a
 weakness caused by a mid-latitude trough advancing eastward from
 offshore of the California coast.  This synoptic pattern should
 result in a gradual northward turn during with some decrease in
 forward speed. The mid-level center of the cyclone is likely to move
 rapidly northeastward into the southwestern United States on days
 3-4, leaving the low-level center meandering offshore the west-
 central Baja California peninsula until dissipation. The NHC
 forecast track is little changed from the previous one, and lies on
 the far eastern side of the guidance envelope and east of the multi-
 model consensus TVCE.
 
 The hurricane-force wind radii have expanded in the northeastern
 quadrant based on SFMR data from the aircraft and now extend out 40
 n mi from the center. Any deviation to the right of the forecast
 track would bring hurricane conditions onshore in the hurricane
 warning area.
 
 Moisture from the remnants of Dolly and the Pacific ITCZ is being
 advected northward by the outer circulation of Norbert across
 northern Mexico and into the southwestern United States. This could
 result in heavy rains and life-threatening flash flooding in these
 areas during the next few days. Please see information from your
 local weather office for more details.
 
 FORECAST POSITIONS AND MAX WINDS
 
 INIT  05/2100Z 23.6N 112.2W   80 KT  90 MPH
  12H  06/0600Z 24.3N 113.3W   75 KT  85 MPH
  24H  06/1800Z 25.0N 114.4W   70 KT  80 MPH
  36H  07/0600Z 25.8N 115.6W   60 KT  70 MPH
  48H  07/1800Z 26.5N 116.6W   45 KT  50 MPH
  72H  08/1800Z 28.4N 117.7W   30 KT  35 MPH...POST-TROP/REMNT LOW
  96H  09/1800Z 29.2N 117.6W   20 KT  25 MPH...POST-TROP/REMNT LOW
 120H  10/1800Z 29.5N 117.4W   15 KT  15 MPH...POST-TROP/REMNT LOW
 
 $$
 Forecaster Kimberlain