HARIMAU2006

Dear friends:

This is report of extended observation at Tabing.

[Observation Time]
Nov. 25: 00, 06, 09, 12, 15, 21Z
Nov. 26: 00, 03, 06, 09, 12, 15, 21Z
Nov. 27: 00, 06, 12, 15, 18Z

[Weather Condition]
Nov. 25 DAY: Cloudy. Rain during 15-16:30(heavy rain during 16:10-16:30)
Night: Cloudy(Slight rain)
Nov. 26 DAY: Cloudy. Rain around 15LT.
Night: Rain.
Nov. 27 DAY: Cloudy.
Night: Rain. Heavy rain during 17-20LT.

[Atmospheric Condition]
Westerly wind could be observed between 0.3-3.5km at 12, 15Z!

[Trouble]
It seemed that observation was often finished under 20 km in night
observation.

reported by Sakurai,

~morishu

Overcast Ac cloud covered the sky in the morning. Broken Cu and scater As obsereved in the daytime. Moderate shower rain with thunder/lightning were observed at MIA site around 13LT and 15LT

[General Echo Distribution]

06LT: Stationary echo clusters had been observded over the sea 40-80km SW-NW of MIA. They maintained their structure until 10LT there.

10LT: Scattered convective echoes were observed around Maninjau lake and E to SE of MIA. Some of them developed into large clusters by 11LT. Especially, those around Maninjau lake developed much, and then moved SW-ward. It extended it coverage much along the coastline, and then passed over the MIA arouund 15LT.

15LT: It developed much until 17LT at S side of MIA after passig overhead there. And then, it changed into stratiform cluster by 20LT. Moderate shaweor rain of 24mm/hr was recorded at MIA during its passage.

18LT: Major parts of the cluster passed over the coastline and were observed over the sea. New convective echoes developed at the W-tern edge (40-60km W of MIA) of the cluster over the sea. They looked stationary and had strong vertical sind shear; W-ly wind was observed below 3km and E-ly above that.

19LT: Another echo in middle-upper layer clustercame from NE of the range. I.t reached th ecoastline by 21LT, and then gatered with echoes which was originally observed over the sea. They extended its broad stratiform region with time but looked stationary. RHIs of the cluster shoed significant vertical wind shear. Major parts of the cluster moved over the sea by 04LT(+1) and went out from te 80km (160km) range by 05 (09) LT(+1).

Broken As awas observed in the morning, and it was followed by broken Cu in the daytime. Heavy shower rain of 96mm/hr in maximum was observed at MIA around 1630-1700LT.

[Genral Echo Distributio]

07LT: Line shaped echo cluster was observed over the sea from 40km to 160km (over Siberut Island) SW of MIA, which echo moved W-ward slowly. It did not developed much and disapperaed by 13LT around Siberut Island.

08LT: Echoes which was a tail part of the cluster were observed within a range of 80km. Thwy developed and went out of the range by 13LT.

12LT: Many convective echoes were observed around Maninjau lake and SE of MIA. They moved SW-ward and some of them developed into clusters. MIA and Tiku sites were covered by those clustered around 15LT and 16LT, respectvely. Maximmum rain rate of 96mm/hr was recorded at MIA site.

20LT: All those clusters moved over the sea with continuous development. Most parts of the clusters were out of 80km range by 23LT. They were observed in the 160km range until next 12LT(+1).

23LT: Other echo clusters which had stayed 40-80km from the coastline were observed until next 10LT (+1). Each echo cell looked moving W-ward one after another, but the cluster itself stayed at almost similar position. Its RHI showed outgoing wind above 3km as general wind direction (E-ly) and incoming wind near the surface below it.

This is the report on 25 Nov. at Tiku radar-site.
This report was written by Mr. Nagumo and Ms. Abe,
Hokkaido University.


[Radar Observation]
11/25
Only ghost echoes apperaed over the see.

11/25 11:36
Convective echo began to develop over the sea in the
south direction of the rada site.

11/25 12:48
Typical anvil cloud extended over the sea.
Convective echo existed over the southern slope of
Maninjau. The number of echoes were increasing.

11/25 15:30
The echo over the Maninjau moved to the west.

11/25 16:18
The echoes began to develop around the sea coast and moved
to the west.

We saw rainbows and beautiful sunset.

11/25 19:04
Strong echo was passing above the radar site, and it
rained heavily.

In the morninig, it was cleare sky with SCT/Cu and SCT/CS. OVC/Cu was obsereved in the daytime, and moderate showers were recorded in the evening at MIA.

[General echo Distribution]

06LT: No significant echo was observed until 11LT both over the land and sea.

11LT: Many convective echoes were observed around E of Maninjau lake and SE of MIA. They moved W-ward with developing into large clusters by 12LT Those around Maninjau lake consisted of major 2 clusters extended W-E; one was located N side and another was located S side of Maninjau lake. They became scattered after 14LT over the adjacent sea.

16LT: Similar cycles of echo development were observed at 10-60km SE of MIA. One of them developed into a large cluster,and passed over the MIA site at 1630LT from E to W. It extended broad stratiform region in its E and S side, and then cleared the land region by 19LT. We observed moderate shower at MIA with active thunderstom and lighting.

At the sama time, it leading edge developed much again at NW of Tiku, and the cluster formed an arc shape. Tough the arc cluster went out side of the short range by 23LT, another middle-upper layer cluster came over the site from E one after another until 04LT(+1). Major part of those broad extended cluster moved continuously W-ward, and then faded away from the outer range too by 03LT(+1).

04LT(+1): No significant echo was observed until 08LT(+1) in the next morning.

This is the report on 24 Nov. at Tiku radar-site.
This report was written by Mr. Nagumo and Ms. Abe,
Hokkaido University.


[Radar Observation]
11/24
Until around 11:00, there were no echo.
11:36
Convective echoes began to develop around Maninjau.

11/24 12:48
Strong echoes existed over the southern and nouthern
slopes of Maninjau, and extended toward west.
It rained at the radar site. Southerly wind blew below the
lelvel of 5km.

11/24 13:55
An echo stayed near the coast in the NW direction of the
radar site.

11/24 16:07
Strong convective echo began to develop over the mountain
in the SE direction of Maninjau.

11/24 17:39
The echo moved to northwest and approached to the radar
site.

11/24 19:00
It arrived at the radar site. Heavy rainfall started. The
echo seemed to move faster than before.


~morishu

Dear friends,

This is daily report on 24th November from Tabing.
We safely finished the original observation period by 24 November, and stated the extended observational period during 25-27 November.
Drs. Hamada, Suleaman, and Evi went back to Jakarta in morning 25, November.

[Weather condition]
Nov. 24 Day: Slight rain at 1300 and 1800 LT.
Night: Slight rain and fine.

[Atmospheric condition]
Day: Weak easterly wind was dominant.

best regards,
Hironori FUDEYASU

Dear friends,

This is daily report from Tabing.

[Weather condition]
Nov. 23 Day: Heavy rain during 1500-1730 LT.
Night: Slight rain during 0030-0230LT.

[Atmospheric condition]
Day: Weak easterly wind was dominant.
Night: Easterly wind peak with less than 10m/s was observed around 9 km.

[Trouble]
GPS of the transmitter did not work well. So we changed new transmitter.


best regards,
Hironori FUDEYASU

OVC/Ac and SCT/Cu were observed in the morning. In the daytime, OVC/Cu covered the MIA site and heavy rain shower of 50mm/hr in maximum was observed around 14LT. Blue sky came back again in the night time.

[General Echo Distribution]

06LT: Several convective echoes were observed ovser the sea 2040km W of MIA. They did not developed much and then disappeared by 07LT. No significant echoe was observed until 11LT.

11LT: Many convective echoes were obsereved around S of Maninjau lake and SE of MIA. They developed into a cluster which extended W-E at S of Maninjau lake. It moved S-ward passed ovehead of MIA at 14LT. Another echo clusters came from mountainous region (E side of MIA), and then they surrounded the MIA at 16LT with other old clusters.

1830LT: Major part of the cluster passed over the MIA and moved over the coastal sea. It developed its extent and moved SW-ward continuously (arrived Siberut 00LT(+1) and disappeared by 03LT(+1)).

21LT: Broad middle-upper layer stratiform echo came from NE side and covered an eastern half of the range by 00LT. It passed through the land region later, and then disapperared over the sea by 04LT(+1). No significant echoe was observed both over the aland and sea by 10LT(+1)

This is the report on 23 Nov. at Tiku radar-site.
This report was written by Mr. Nagumo and Ms. Abe,
Hokkaido University.

[Radar Observation]
11/23 09:00
Convective echoes existed only over the sea (SW side from radar site).

11:19
Small echoes began to develop around Maninjou.

15:25
Convective echoes over the land moved toward west.

16:42
Echoes extended widely.
Surface wind blew E-ly (1-2m/s), Low level W-ly (5m/s) and Higher level E-ly (10m/s).
It rained heavily at the radar site.

17:30
Convective clouds over the sea produced thunder and lightening.

Overcast middle layer cloud (As) ovserved in the morning. There was some sunshine in the daytime but no blue sky. ~morishu

[General Echo Distribution]

05LT: Shallow echoes were observed in the eastern slope of mountains
(25km apart from MIA site), and moved westward. They passed
over MIA site around 6:30LT.

06LT: Other echoes developed NW-SEward over the sea and the above
echoes from the land overtook them around 8LT.

09LT: In the echoes line shaped echo developed north-eastward and it
maintained until 11:30LT.

13LT: Convective echoes developed in the mountains at E of MIA sit e.
They passed over MIA site during 13:30-14:40LT.

15LT: Many convective echoes were observed around Maninjau lake, and
they moved westward to the sea. They became expanded stratiform
and went out the radar observation area until 21:30LT.
(17-18LT: Moderate shower of 40mm/h was observed at MIA. ~morishu)

22LT: Echo clusters developed in the eastern part of mountains
(25km apart from MIA site), and moved westward. They becameweak
widespread echo and passed over MIA site during

00:30-03LT (Echo top height was 10km at most).

reported by namihei,

~morishu

Dear friends,

This is daily report from Tabing.

[Weather condition]
Nov. 21 Day: Cloudy. No rain.
Night: Cloudy and +lightning.
Nov. 22 Day: Heavy rain at 1615-1750 LT.

[Atmospheric condition]
Nov. 21 Night: Wet layer (RH>80) prevailed below 5 km. Easterly wind was weaker than that in last night.

Nov. 22 Day: There was an inversion layer around 4.5 km. Easterly wind peak around 5 km was observed.


[Trouble]
The thermometer of transmitter did not work well. So we changed new transmitter.

best regards,
Hironori FUDEYASU

This is the report on 22 Nov. at Tiku radar-site.
This report was written by Mr. Nagumo and Ms. Abe,
Hokkaido University.


[Radar Observation]
11/22 8:18
Wide-band echo existed over the sea. Norhterly wind blew
near the surface.

11/22 9:42
Surface wind changed to SW-ly, then strong W-ly.

11/22 11:13
The band echo stayed around the rader site. Echoes began
to develop over the western slope of Maninjau.

11/22 12:01
Meso-β-scale band echo shifted to the west.
11/22 14:34
Other strong echoes began to develop over the northern
slope of Maninjau.

11/22 16:00
Echo developed over the western slope of Maninjau moved to
the rader site gradually. Upper level wind direction was
NW-ly, and low level wind direction was SW-ly.
Thunder and lightning frequently.

11/22 18:22
It began to rain heavily at the radar site. Convective
echoes continued to develop near the site. Wide stratiform
echo existed.

11/22 20:00
Heavy rainfall continues.

It was clear sky with SCT/Cu and SCT/Ac, and then BKN/Cu in the daytime.

[General Echo Distribution]

Echo custers were observed ovser the sea 100-160km NW of MIA which had developed in the late last night. They moved NW-ward and disappeared by 09LT.

11LT: Many convective echoes were observed around Maninjau lake and over mountains at SE of MIA. They showed similar life cycle until 20LT that they were generated around mountainous region, and then moved W-ward with developing (some of them gathered into clusters). They weaken and disappeared over the adjacent sea.

15LT: Broad echo region was observed 100-1160km NW of MIA. A line shaped convective region was formed around 1630LT but disappeared within 1 hour. Maijor part of the echo moved NW-ward, and then disappreared by 22LT after wekend into stratiform one. Another convective echoes were also obsereved around off the coast of Siberut Island until 00LT(+1).

21LT: Large number of convective echoes were observed along 20km off the coastline. They developed into clusters and moved WNW-ward one after another until 04LT(+1).

06LT: Shallow stratiform echowas observed W side hoothill of the mountains (E of MIA). Another convective echoes were shown over the sea along the coastline. They had gathered over the sea by 08LT(+1), and the developed much 20-40km W of MIA. (to be continue)

~morishu

Dear friends,

This is daily report from Tabing.
Dr. Sakurai started to work at MIA XDR site.

[Weather condition]
Nov. 20 Day: Cloudy. No rain.
Night: Cloudy. No rain.

[Atmospheric condition]
Nov. 20 Day: There was an inversion layer around 3 km. Easterly wind peak were observed around 5 km.

Nov. 20 Night: The peak of easterly wind (about 12 m/s) with wet layer (RH:100%) was observed at 3 km, while dry layer (RH: 20%) in 3-5 km. An inversion layer was above 3 km.

[Trouble]
There was following trouble in the preparation of transmitter.

12Z 20
The transmitter using the battery did not send the data. So we changed new transmitter.


Best regards,
Hironori FUDEYASU

This is the report on 21 Nov. at Tiku radar-site.
This report was written by Mr. Nagumo and Ms. Abe,
Hokkaido University.

[Radar Observation]
11/21 8:18
Some convective small echoes existed over the sea in the NW side.

11/21 11:30
Convective echoes began to develop over Maninjau.

11/21 12:42
Some convective echoes began to develop over the wide region of land.

11/21 13:25
A strong echo began to develop over the northeastern slope of Maninjau, and then moved toward north.

11/21 15:00
Upper level wind is easterly.

11/21 15:36
Anvil clouds extended widely from each convective clouds.

11/21 16:00-
Wide echo over the Maninjau, with several convective cores moved toward SW and approached to the radar site. Line echo with 60 km in length existed in the NW side.

11/21 17:00-
Antoher convective echo began to develop over the southern slope of Maninjau, and approached to the radar site to cause rainfall.

Dear friends,

This is daily report from Tabing.
Dr. Sakurai started to work at MIA XDR site.

[Weather condition]
Nov. 20 Day: Cloudy. No rain.
Night: Cloudy. No rain.

[Atmospheric condition]
Nov. 20 Day: There was an inversion layer around 3 km. Easterly wind peak were observed around 5 km.

Nov. 20 Night: The peak of easterly wind (about 12 m/s) with wet layer (RH:100%) was observed at 3 km, while dry layer (RH: 20%) in 3-5 km. An inversion layer was above 3 km.

[Trouble]
There was following trouble in the preparation of transmitter.

12Z 20
The transmitter using the battery did not send the data. So we changed new transmitter.


Best regards,
Hironori FUDEYASU

We found the road was wet in the early morning because of rainfall in the late last night. It was clear blue sky with SCT/Cu and SCT/Ci in the daytime.

[General Echo Distribution]

06LT: Convective echo clusters were observed 40-60km SW of MIA which moved NW-ward. They went out from the 80km range by 08LZ, and then out of 160km range by 11LT. Threre was no significant echo over the land and sea until 13LT.

13LT: Several convective echoes were observed around Maninjau lake and MIA to SE region. Some of them developed a little into clusters which moved NW-ward and disapperared over the adjacent sea one after another until 19LT.

02LT(+1): Several cnvective sechoes were observed over the adjascent sea along the coastline. They moved NW-ward and not developed much in the 80km ragnge, Whereas, those around 100-150km NW-W of MIA developed mcch and lasted until 09LT(+1).

This is the report on 20 Nov. at Tiku radar-site.
This report was written by Mr. Nagumo and Ms. Abe,
Hokkaido University.

Last evening (around 21 LST), heavy rainfall occurred at
our hotel. After that, it blowed strongly.
Air mass seemed to change (became drier ?).

[Radar Observation]
11/20 8:24
Well developed clouds existed off the sea in the SE side.

11/20 11:52
No echo.

11/20 15:48
A strong echo began to develop over the southern slope of
Maninjau. It moved toward NW along the mountain.

11/20 17:25
Strong convective echo existed in the NE region of radar
site.


~morishu

It was clear cky with SCT/Ac and SCT/Cu in the morning. In the afternoon, we had still some blue sky above the BKN/Cu. Moderate shower was observed in the night (21-23LT) with E-ly gust wind (but less than 10m/s).

[General Echo Distribution]

06LT: Echo cluster extended from off the Tiku beach to N side of Siberut was observed in the long range mode since last night. It weaken and scattered by 08LT, and then disappeared by 10LT. Its tail end had been observed 60-80km NW of MIA by the short range mode. Though the cluster was extended from SE-NW, each echo cell in it lined up perpendiculer to the cluster line aame as those shown in the last night. News echoecells were generated off the Tiku beach, and then moved NW-ward inside of main cluster line.

12LT: Many small echoes were observed around Maninjau lake and SE of MIA. Those around Maninjau lake gatered into a cluster lined up W-E. It moved W-ward and then scattered over the adjacent sea. This similar cycle was repeated again and again until 18LT.
Those echo at SE of MIA moved W-ward withdeveloping into clusters, and then disappeared over the sea one after another.

17LT: A broad cluster was observed over the land in long range mode 100km NW of MIA It moved NW-ward along the coastline, and then faded waway from the range by 22LT.

20LT: Several convective echoes were observed around 20-40km E of MIA followed by broad extended middle layer cloud over 60-80km E.

21LT: The echoes developed into a cluster and lined up N-S around 20-40km E of MIA. RHI of radial velocity showed strong E-ly wind up to 20m/s centered at 2-3km high in the cluster. (note: radial velocity was folded at 13.8m/s in the figure)

22LT: Broad anvil coud covered the land region after the leading edge of cluster passed overhead of MIA. The convective region of the cluster developed again over the sea at NW side of MIA. Main body of the cluster changed into stratiform one and faded away from the 80km range by 01LT(+1), and then disppeared completely by 04LT(+1). The anvil echo at middle-upper layer disappeared too from 80km range by 06LT(+1).

02LT: Several convective echoes were observed 50-60km S of MIA. Some of them gatered into clusters, and moved NW-ward. They developed a little, and then disappeared by 08LT.

~morishu

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