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Tropical Storm Kiko Forecast Discussion Number 40

2019-09-22 10:58:35| National Hurricane Center (East Pacific)

Issued at 1100 PM HST Sat Sep 21 2019 509 WTPZ43 KNHC 220858 TCDEP3 Tropical Storm Kiko Discussion Number 40 NWS National Hurricane Center Miami FL EP132019 1100 PM HST Sat Sep 21 2019 A small but growing burst of deep convection has resumed near the center of Kiko, but the cyclone is considerably weaker than earlier today. ASCAT data indicated maximum winds of 30-35 kt, and 35 kt will be the initial intensity. Within about 24 hours, Kiko has a chance to re-strengthen as it moves over warmer waters in a lighter shear region. Model agreement is in fairly good agreement on tenacious Kiko intensifying once again. However, Kiko should resume weakening again in about 3 days due to a significant increase in shear and cooler waters, and hopefully the next 48 hours are the last hurrah of Kiko. Kiko is moving southwestward tonight at about 7 kt. The storm should continue to lose latitude for about the next 24 hours due to the orientation of a ridge to the northwest. After that time, the western portion of an incoming mid-latitude trough is forecast to cut off east of the Hawaiian Islands, causing Kiko to turn sharply northwestward on days 2-4. Once a remnant low, Kiko is then expected to be steered by lower-level flow, causing it to turn back to the southwest. No significant changes were made to the sinuous forecast track and, if Kiko survives as long as predicted below, it would end up one of the 10 longest-lasting tropical cyclones in eastern Pacific history. FORECAST POSITIONS AND MAX WINDS INIT 22/0900Z 17.0N 132.9W 35 KT 40 MPH 12H 22/1800Z 16.3N 133.7W 30 KT 35 MPH 24H 23/0600Z 15.7N 135.0W 35 KT 40 MPH 36H 23/1800Z 16.0N 136.1W 40 KT 45 MPH 48H 24/0600Z 17.3N 137.2W 45 KT 50 MPH 72H 25/0600Z 19.5N 139.0W 35 KT 40 MPH 96H 26/0600Z 19.0N 140.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 27/0600Z 18.0N 140.5W 25 KT 30 MPH...POST-TROP/REMNT LOW $$ Forecaster Blake

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Tropical Depression Lorena Forecast Discussion Number 20

2019-09-22 10:56:09| National Hurricane Center (East Pacific)

Issued at 300 AM MDT Sun Sep 22 2019 000 WTPZ45 KNHC 220856 TCDEP5 Tropical Depression Lorena Discussion Number 20 NWS National Hurricane Center Miami FL EP152019 300 AM MDT Sun Sep 22 2019 Very little convection remains with Lorena, with only a small burst near the center. Strong southwesterly shear continues to weaken Lorena, and ASCAT data indicate the maximum winds are down to 30 kt. All watches and warnings have been discontinued on this advisory. Lorena is forecast to move northward across northwestern Mexico later this morning and rapidly dissipate within 24 hours over the high terrain. There are no significant changes to the track or intensity forecasts. Key Messages: 1. Lorena may produce dangerous flash flooding in Sonora today. Moisture associated with Lorena may also result in locally heavy rain over parts of Arizona early in the week. There is a slight Risk of excessive rainfall over central Arizona on Monday. FORECAST POSITIONS AND MAX WINDS INIT 22/0900Z 28.3N 111.5W 30 KT 35 MPH 12H 22/1800Z 29.7N 111.9W 25 KT 30 MPH...INLAND 24H 23/0600Z...DISSIPATED $$ Forecaster Stewart/Blake

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Tropical Depression Mario Forecast Discussion Number 20

2019-09-22 10:51:07| National Hurricane Center (East Pacific)

Issued at 300 AM MDT Sun Sep 22 2019 000 WTPZ44 KNHC 220851 TCDEP4 Tropical Depression Mario Discussion Number 20 NWS National Hurricane Center Miami FL EP142019 300 AM MDT Sun Sep 22 2019 Mario continues to be a fully exposed swirl of low clouds devoid of convection, and is close to becoming a remnant low. The initial intensity is reduced to 30 kt based on ASCAT data. With no models showing any significant re-development of deep convection, slow weakening is forecast, and the cyclone should decay into a remnant low later today. The new intensity forecast is basically an update of the previous one, adjusted for lower initial winds. Mario is now moving a little faster with an initial motion of 335/8 kt. The track guidance is in good agreement on a north- northwestward at a slower pace through 48 hours. The new forecast track is very close to the previous one and the latest consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 22/0900Z 21.0N 111.3W 30 KT 35 MPH 12H 22/1800Z 22.0N 112.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 24H 23/0600Z 23.4N 113.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 36H 23/1800Z 24.7N 113.6W 20 KT 25 MPH...POST-TROP/REMNT LOW 48H 24/0600Z 25.9N 113.8W 15 KT 15 MPH...POST-TROP/REMNT LOW 72H 25/0600Z...DISSIPATED $$ Forecaster Stewart/Blake

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Tropical Storm Mario Forecast Discussion Number 19

2019-09-22 04:54:37| National Hurricane Center (East Pacific)

Issued at 900 PM MDT Sat Sep 21 2019 000 WTPZ44 KNHC 220254 TCDEP4 Tropical Storm Mario Discussion Number 19 NWS National Hurricane Center Miami FL EP142019 900 PM MDT Sat Sep 21 2019 Mario has been a swirl of low clouds devoid of convection since the last advisory. The initial intensity is reduced to 35 kt based mainly on subjective satellite intensity estimates from TAFB and SAB, and passive microwave winds from the WindSat suggests the possibility this is a bit generous. While Mario remains in an area of strong easterly vertical shear, it is still over warm sea surface temperatures and in a relatively moist air mass. Thus, the lack of convection is a little surprising. The intensity forecast will show little change in strength during the next 12 h in anticipation of a convective burst developing near the center during the diurnal maximum. After that time, dry air entrainment and movement over cooler waters should inhibit the development of convection, and the cyclone is forecast to decay into a remnant low by 36 h, if not sooner. The new intensity forecast is again mainly an update of the previous forecast. Mario is now moving a little faster with an initial motion of 350/6 kt. The track guidance is in good agreement on a north- northwestward to northwestward motion through about 48 h, followed by a more northward motion near the 72 h point. Once again, little change was made to the forecast track. FORECAST POSITIONS AND MAX WINDS INIT 22/0300Z 20.3N 110.8W 35 KT 40 MPH 12H 22/1200Z 21.3N 111.5W 35 KT 40 MPH 24H 23/0000Z 22.7N 112.5W 30 KT 35 MPH 36H 23/1200Z 24.1N 113.4W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 24/0000Z 25.3N 113.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 25/0000Z 27.5N 113.5W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 26/0000Z...DISSIPATED $$ Forecaster Beven

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Tropical Storm Kiko Forecast Discussion Number 39

2019-09-22 04:41:11| National Hurricane Center (East Pacific)

Issued at 500 PM HST Sat Sep 21 2019 000 WTPZ43 KNHC 220241 TCDEP3 Tropical Storm Kiko Discussion Number 39 NWS National Hurricane Center Miami FL EP132019 500 PM HST Sat Sep 21 2019 Kiko is only producing a relatively small patch of deep convection to the northeast of its center, the result of continued southwesterly shear and the cyclone moving through what appears to be a stable environment. The initial intensity is held at 45 kt based on the earlier ASCAT data, but it's possible the maximum winds have decreased since then. Given Kiko's structure and its environment, some weakening is expected during the next day or so. However, the cyclone is moving southwestward, toward slightly warmer waters, and this could allow for some restrengthening in 36-48 hours, which is shown by many of the intensity models. Another round of shear and cooler waters should lead to weakening after 48 hours, and Kiko is expected to degenerate into a remnant low by day 5, if not sooner. Kiko is moving a little faster toward the west-southwest, or 240/7 kt. An elongated mid- to upper-level trough extending from California to near the Hawaiian Islands is digging southward, which is forcing the subtropical ridge--and Kiko--to lose latitude during the next 36 hours. After that time, the western portion of the trough is forecast to cut off east of the Hawaiian Islands, causing Kiko to turn sharply northwestward on days 2-4. Once a remnant low, Kiko is then expected to be steered by lower-level flow, causing it to turn back to the southwest. Only small adjustments to the NHC track forecast were made on this cycle, and it still depicts a wave-like trajectory through day 5, as has been the case for several days. FORECAST POSITIONS AND MAX WINDS INIT 22/0300Z 17.5N 132.5W 45 KT 50 MPH 12H 22/1200Z 16.8N 133.3W 40 KT 45 MPH 24H 23/0000Z 16.0N 134.5W 40 KT 45 MPH 36H 23/1200Z 15.8N 135.7W 45 KT 50 MPH 48H 24/0000Z 16.5N 136.8W 50 KT 60 MPH 72H 25/0000Z 18.8N 138.5W 40 KT 45 MPH 96H 26/0000Z 19.2N 139.8W 30 KT 35 MPH 120H 27/0000Z 18.1N 140.5W 25 KT 30 MPH...POST-TROP/REMNT LOW $$ Forecaster Berg

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