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Storm Nora 2015

Date Time Type Wind Pressure
UTC knots km/h mph mb
Oct 1600:00S40
Oct 1518:00L291010
Oct 1512:00D291008
Oct 1506:00D291006
Oct 1500:00S521005
Oct 1418:00D291004
Oct 1412:00D351004
Oct 1406:00D351004
Oct 1400:00S631002
Oct 1318:00S461004
Oct 1312:00S461002
Oct 1306:00S461002
Oct 1300:00S691001
Oct 1218:00S58999
Oct 1212:00S69996
Oct 1206:00S69993
Oct 1200:00S69993
Oct 1118:00S69993
Oct 1112:00S63998
Oct 1106:00S581000
Oct 1100:00S521002
Oct 1018:00S521002
Oct 1012:00S461004
Oct 1006:00S401006
Oct 1000:00S401006
Oct 918:00D351008
Oct 912:00D351008
Oct 906:00L291009

Storm Nora 2015

Last Modified:

Satellite images and tracking maps of Tropical Storm Nora 2015, October 9 - 16. Max wind speed 69mph.

Nora's satellite presentation continues to feature an irregular CDO with little in the way of convective banding. The initial intensity remains 45 knots based on a blend of the latest TAFB and SAB Dvorak classifications. ASCAT data received around the time of the last advisory suggested that Nora is a very small tropical cyclone, with tropical storm force winds only extending outward up to 30 nautical miles in the northern semicircle. An AMSR2 microwave image from the JAXA GCOM-W2 satellite around 22Z clearly showed the low-level center on the southeastern edge of the deep convection, but convection has formed closer to the center since that time.

The near-storm environment should be favorable for some strengthening in the next 48 hours or so, with warm waters and low vertical shear, but there is some mid-tropospheric dry air in the environment that could limit strengthening. After that time, the vertical shear begins to increase as the cyclone recurves, and steady weakening is forecast to begin after 72 hours. The NHC forecast generally follows the trend of the previous one, but no longer explicitly shows Nora reaching hurricane strength. However, this is certainly still possible. The NHC prediction is close to the FSU Superensemble through 36 hours and near the intensity consensus after that time.

The ASCAT data and microwave fixes indicated that the center of Nora was located a little southwest of the position in the previous advisory, but the initial motion remains westward at 12 knots. The synoptic reasoning for the track forecast has not changed, as Nora will be steered westward at a decreasing forward speed for the next 36 to 48 hours by a weakening ridge to the north. After that time, Nora should begin to recurve into a break in the ridge and then turn northeastward by the end of the period under the influence of a longwave trough over the north-central Pacific. The new NHC track forecast has been adjusted to the south and west of the previous one through 72 hours to account for the initial position and motion, and is near the previous official forecast track after that time. The NHC forecast lies between the latest ECMWF forecast and the TVCE multi-model consensus.

With Nora moving into the central North Pacific basin, this will be the last advisory from NHC. Future information on Nora can be found in advisories issued by the Central Pacific Hurricane Center beginning at 1100 PM HST (09:00 UTC).

Information provided by NHC.

Storms

2015

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