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Tropical Storm Elida Forecast Discussion Number 7
2020-08-10 16:36:30| National Hurricane Center (East Pacific)
Issued at 900 AM MDT Mon Aug 10 2020 000 WTPZ44 KNHC 101436 TCDEP4 Tropical Storm Elida Discussion Number 7 NWS National Hurricane Center Miami FL EP092020 900 AM MDT Mon Aug 10 2020 Elida is very close to reaching hurricane strength. A 1218 UTC SSMIS microwave pass revealed a nearly enclosed eyewall that was somewhat eroded on the west side, possibly due to a bit of north-northwesterly shear (as shown by the SHIPS diagnostics). Subjective Dvorak estimates from TAFB and SAB are T3.5/55 kt, while the objective guidance from UW-CIMSS is about 5-10 kt higher. Because of the gradually improving structure in microwave imagery, the initial intensity is set at 60 kt, which is a blend of the intensity estimates. Located along the southern periphery of a mid-level ridge which extends from the south-central U.S. southwestward into the Pacific, Elida is moving west-northwestward at 300/13 kt. Confidence in the track forecast remains high since this ridge will be the main driving force for the next 2-3 days, keeping Elida on a west-northwestward but gradually slowing trajectory. In about 3 days, a weaker Elida will turn westward and slow down even further due to lighter low-level steering winds. The spread in the guidance does increase beyond 60 hours, particularly with the GFS showing a significant poleward motion, but this unlikely scenario appears to be due to the model tracker deviating from the path of the surface circulation. The new NHC track forecast is nudged only slightly north of the previous forecast, mainly due to a continuation of Elida's recent trajectory. This new forecast is a blend of the previous forecast and the NOAA-HCCA and TVDG consensus approaches. The SHIPS model suggests that whatever shear is still affecting Elida should die down within the next 12 hours, and the storm has about 24 hours left over waters warmer than 26 degrees Celsius. These conditions should allow for continued strengthening over the next day or so, with rapid intensification still a possibility. For that reason, the NHC intensity forecast is just above nearly all of the guidance at 24 hours. After 24 hours, gradual weakening should commence as Elida moves over cooler waters, and the rate of weakening is likely to accelerate by day 3 once southwesterly shear increases. Elida is expected to become a remnant low by day 4 and dissipate by day 5, in accordance with the solutions shown by the global models. FORECAST POSITIONS AND MAX WINDS INIT 10/1500Z 18.9N 109.8W 60 KT 70 MPH 12H 11/0000Z 19.7N 111.9W 70 KT 80 MPH 24H 11/1200Z 20.5N 114.5W 80 KT 90 MPH 36H 12/0000Z 21.3N 117.0W 75 KT 85 MPH 48H 12/1200Z 22.0N 119.3W 65 KT 75 MPH 60H 13/0000Z 22.5N 121.3W 50 KT 60 MPH 72H 13/1200Z 22.7N 122.8W 40 KT 45 MPH 96H 14/1200Z 22.5N 125.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 15/1200Z...DISSIPATED $$ Forecaster Berg
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Tropical Storm Elida Forecast Advisory Number 7
2020-08-10 16:36:00| National Hurricane Center (East Pacific)
Issued at 1500 UTC MON AUG 10 2020 000 WTPZ24 KNHC 101435 TCMEP4 TROPICAL STORM ELIDA FORECAST/ADVISORY NUMBER 7 NWS NATIONAL HURRICANE CENTER MIAMI FL EP092020 1500 UTC MON AUG 10 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 18.9N 109.8W AT 10/1500Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 300 DEGREES AT 13 KT ESTIMATED MINIMUM CENTRAL PRESSURE 993 MB MAX SUSTAINED WINDS 60 KT WITH GUSTS TO 75 KT. 50 KT....... 20NE 0SE 0SW 20NW. 34 KT....... 50NE 50SE 20SW 50NW. 12 FT SEAS..120NE 90SE 60SW 90NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 18.9N 109.8W AT 10/1500Z AT 10/1200Z CENTER WAS LOCATED NEAR 18.6N 109.1W FORECAST VALID 11/0000Z 19.7N 111.9W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 15NE 0SE 0SW 15NW. 50 KT... 30NE 20SE 10SW 30NW. 34 KT... 60NE 50SE 30SW 60NW. FORECAST VALID 11/1200Z 20.5N 114.5W MAX WIND 80 KT...GUSTS 100 KT. 64 KT... 15NE 10SE 0SW 15NW. 50 KT... 30NE 20SE 20SW 30NW. 34 KT... 60NE 50SE 30SW 60NW. FORECAST VALID 12/0000Z 21.3N 117.0W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 15NE 0SE 0SW 15NW. 50 KT... 30NE 20SE 20SW 30NW. 34 KT... 70NE 50SE 40SW 60NW. FORECAST VALID 12/1200Z 22.0N 119.3W MAX WIND 65 KT...GUSTS 80 KT. 64 KT... 15NE 0SE 0SW 0NW. 50 KT... 30NE 20SE 20SW 20NW. 34 KT... 70NE 40SE 40SW 60NW. FORECAST VALID 13/0000Z 22.5N 121.3W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 20NE 0SE 0SW 20NW. 34 KT... 50NE 30SE 20SW 50NW. FORECAST VALID 13/1200Z 22.7N 122.8W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 50NE 30SE 0SW 50NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 100 NM ON DAY 4 AND 150 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 14/1200Z 22.5N 125.5W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. OUTLOOK VALID 15/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 18.9N 109.8W NEXT ADVISORY AT 10/2100Z $$ FORECASTER BERG
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Tropical Storm Elida Forecast Discussion Number 6
2020-08-10 10:51:13| National Hurricane Center (East Pacific)
Issued at 300 AM MDT Mon Aug 10 2020 000 WTPZ44 KNHC 100851 TCDEP4 Tropical Storm Elida Discussion Number 6 NWS National Hurricane Center Miami FL EP092020 300 AM MDT Mon Aug 10 2020 After the earlier burst of deep convection and the development of a small 10-nmi-wide low- to mid-level eye noted in passive microwave satellite imagery, convection has waned somewhat and the eye feature has eroded in the northwestern semicircle due to entrainment of dry air, along with some modest northwesterly vertical wind shear. A 0314Z ASCAT-A overpass revealed peak winds of only 43 kt in the northeastern quadrant, along with a radius of maximum winds (RMW) of 10-15 nmi. Satellite intensity estimates range from T3.5/55 kt from TAFB to T4.0/65 kt from SAB, along with a UW-CIMSS SATCON estimate of 53 kt and an ADT estimate of 59 kt. An average of these intensity estimates, and allowing for some undersampling by the scatterometer instrument due to Elida's small RMW, supports maintaining an intensity of 55 kt for this advisory. The initial motion estimate remains west-northwestward or 300/13 kt. Both the forecast track and rationale remain straight-forward and basically unchanged from the previous advisory. Elida is expected to be steered west-northwestward by a deep layer ridge to the north for the next 72 hours or, followed by a westward motion on days 4 and 5 when Elida will be weakening over much cooler waters and becoming a shallower cyclone. The latest NHC track guidance remains tightly packed and, thus, the new official forecast is very similar to the previous advisory track, and lies near the TVCE and NOAA-HCCA consensus track models. The brief intensity hiatus that Elida is experiencing is expected to be short-lived due to the cyclone's small RMW and the vertical shear forecast to decrease to less than 10 kt in the 12-36 hour time frame. This should allow for Elida to strengthen -- possibly even rapidly -- during the next 24 hours, followed by a leveling off in the intensity due to the cyclone moving over sub-26C sea-surface temperatures (SST). By 48-60 h, SSTs less than 25C and modest southwesterly vertical wind shear will combine to induce steady weakening. By 96 h or so, Elida is forecast to degenerate into a post-tropical cyclone. The new official intensity forecast is a little lower than the previous advisory, but is a little above the consensus models IVCN and HCCA. FORECAST POSITIONS AND MAX WINDS INIT 10/0900Z 18.3N 108.8W 55 KT 65 MPH 12H 10/1800Z 19.1N 110.8W 65 KT 75 MPH 24H 11/0600Z 20.0N 113.5W 75 KT 85 MPH 36H 11/1800Z 20.8N 116.2W 80 KT 90 MPH 48H 12/0600Z 21.5N 118.6W 65 KT 75 MPH 60H 12/1800Z 22.2N 120.7W 55 KT 65 MPH 72H 13/0600Z 22.6N 122.6W 45 KT 50 MPH 96H 14/0600Z 22.2N 125.7W 35 KT 40 MPH...POST-TROPICAL 120H 15/0600Z 21.4N 128.8W 25 KT 30 MPH...POST-TROP/REMNT LOW $$ Forecaster Stewart
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Tropical Storm Elida Forecast Advisory Number 6
2020-08-10 10:36:44| National Hurricane Center (East Pacific)
Issued at 0900 UTC MON AUG 10 2020 000 WTPZ24 KNHC 100836 TCMEP4 TROPICAL STORM ELIDA FORECAST/ADVISORY NUMBER 6 NWS NATIONAL HURRICANE CENTER MIAMI FL EP092020 0900 UTC MON AUG 10 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 18.3N 108.8W AT 10/0900Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 300 DEGREES AT 13 KT ESTIMATED MINIMUM CENTRAL PRESSURE 995 MB MAX SUSTAINED WINDS 55 KT WITH GUSTS TO 65 KT. 50 KT....... 20NE 0SE 0SW 0NW. 34 KT....... 50NE 50SE 0SW 40NW. 12 FT SEAS..120NE 90SE 45SW 90NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 18.3N 108.8W AT 10/0900Z AT 10/0600Z CENTER WAS LOCATED NEAR 18.0N 108.1W FORECAST VALID 10/1800Z 19.1N 110.8W MAX WIND 65 KT...GUSTS 80 KT. 64 KT... 15NE 0SE 0SW 0NW. 50 KT... 30NE 20SE 0SW 30NW. 34 KT... 60NE 50SE 20SW 60NW. FORECAST VALID 11/0600Z 20.0N 113.5W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 15NE 0SE 0SW 15NW. 50 KT... 30NE 20SE 20SW 30NW. 34 KT... 70NE 60SE 30SW 70NW. FORECAST VALID 11/1800Z 20.8N 116.2W MAX WIND 80 KT...GUSTS 100 KT. 64 KT... 15NE 0SE 0SW 15NW. 50 KT... 30NE 20SE 20SW 30NW. 34 KT... 80NE 60SE 40SW 70NW. FORECAST VALID 12/0600Z 21.5N 118.6W MAX WIND 65 KT...GUSTS 80 KT. 64 KT... 15NE 0SE 0SW 0NW. 50 KT... 30NE 20SE 20SW 20NW. 34 KT... 80NE 50SE 40SW 70NW. FORECAST VALID 12/1800Z 22.2N 120.7W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 20NE 0SE 0SW 20NW. 34 KT... 60NE 40SE 20SW 60NW. FORECAST VALID 13/0600Z 22.6N 122.6W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 50NE 30SE 0SW 50NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 100 NM ON DAY 4 AND 150 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 14/0600Z 22.2N 125.7W...POST-TROPICAL MAX WIND 35 KT...GUSTS 45 KT. OUTLOOK VALID 15/0600Z 21.4N 128.8W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 18.3N 108.8W NEXT ADVISORY AT 10/1500Z $$ FORECASTER STEWART
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Tropical Storm Elida Forecast Discussion Number 5
2020-08-10 04:35:35| National Hurricane Center (East Pacific)
Issued at 900 PM MDT Sun Aug 09 2020 000 WTPZ44 KNHC 100235 TCDEP4 Tropical Storm Elida Discussion Number 5 NWS National Hurricane Center Miami FL EP092020 900 PM MDT Sun Aug 09 2020 Trends in satellite imagery over the past several hours indicate that Elida continues to quickly increase in organization. There has been an expanding central dense overcast, with the center of circulation presumed to be underneath cloud tops of about -70 C. Satellite intensity estimates TAFB and SAB as well as those from UW-CIMSS support increasing the initial intensity to 55 kt. Environmental conditions favor rapid intensification over the next 24 h or so. The latest SHIPS RI index indicates a better than 30 percent chance of Elida strengthening by 30 kt in the next 24 h, and based on the convective trends, the official forecast closely follows this guidance. By 48 h, the cyclone is forecast to cross the 26 C SST isotherm, and begin to enter a progressively drier and more stable atmospheric environment. This should cause steady weakening to occur. By 96 h, Elida is forecast to have been over waters cooler than 25 C for nearly 36 h. And as a result, the simulated satellite imagery by the GFS, ECMWF, and Canadian models all indicate that the deep convection will dissipate by that time. Therefore, Elida is expected to become a post-tropical cyclone by the 96 h forecast period. The latest NHC intensity forecast is little changed from from previous one, is close to the HCCA model intensity guidance for the next couple of days, then trends towards the SHIPS guidance thereafter. Elida continues to move west-northwestward at 13 k, steered by a mid-level ridge extending from northern Mexico to the east Pacific. This pattern is forecast to remain in place for the next few days. After that time, a slower westward or west-southwestward motion is expected as the weakening cyclone is steered by the low-level trade wind flow. The model track forecasts are in good agreement on this scenario, and the latest NHC forecast track is in the middle of the consensus track guidance. FORECAST POSITIONS AND MAX WINDS INIT 10/0300Z 17.8N 107.4W 55 KT 65 MPH 12H 10/1200Z 18.7N 109.4W 70 KT 80 MPH 24H 11/0000Z 19.6N 112.1W 80 KT 90 MPH 36H 11/1200Z 20.3N 114.8W 85 KT 100 MPH 48H 12/0000Z 21.0N 117.4W 80 KT 90 MPH 60H 12/1200Z 21.6N 119.6W 65 KT 75 MPH 72H 13/0000Z 22.1N 121.5W 55 KT 65 MPH 96H 14/0000Z 22.0N 124.9W 40 KT 45 MPH...POST-TROPICAL 120H 15/0000Z 21.1N 128.3W 30 KT 35 MPH...POST-TROP/REMNT LOW $$ Forecaster Latto
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