1 NICT, Japan (satoh@nict.go.jp) 2 Osaka University, Japan 3 Toshiba Corporation, Japan

Three-dimensional Fine Structure of Localized Heavy Rainfalls Measured by Phased Array Weather Radar

Shinsuke Satoh 1 , Tomoo Ushio 2, Shigeharu Shimamura 2, Koichi Maruo 2, Fumihiko Mizutani 3, Masakazu Wada 3, Hiroshi Hanado 1, Seiji Kawamura 1, Seiho Uratsuka 1 and Toshio Iguchi 1

1 NICT, Japan (satoh@nict.go.jp)2 Osaka University, Japan3 Toshiba Corporation, Japan

1. Introduction ・ In Japan, severe weather

disasters caused by localized heavy rainfalls or tornadoes have occurred frequently in the last several years.

・ Although it is important to measure three dimensional structure of the rapidly developed severe storms, a volume scan by a parabolic antenna requires substantial time of more than 5 minutes.

Flash flood in the Toga river, Kobe （ 28 July 2008 ）

Small radar network observation

Invisible regionInvisibleregion

Big radar observation

F2 tornado in Tsukuba （ 6 may 2012 ）

The observation area of MLIT C-band radar and X-band MP radar (small blue circles).

2. 3-dim precipitation distribution in isolated cumulonimbus (July 26, 2012)

3-1. PAWR Observation Range

3-2. Back-building localized heavy rainfalls around Uji (Aug 14, 2012)

• We showed some localized heavy rainfall events observed phased array weather radar using 3-dim visualization.

• We have developed real-time data processing system and are at work on creating the web page.

5. Summary17:38:16 17:40:16 17:42:16 17:44:16JST

17:30:16 17:32:16 17:34:16 17:36:16

10 km

5 km

Detailed（ 10 sec. ）

300 range×320 sector （ AZ ） ×110 angle （ EL ） ×2 byte ＝ 20.3 MB / fileTotal size (13 files) ： 275 MB / 10sec （～ 2.4TB/day ⇒ ） 220 Mbps

Normal（ 30sec.）

600 range×300 sector （ AZ ） ×110 angle （ EL ） ×2 byte ＝ 37.8 MB / fileTotal size (13 files) ： 493 MB / 30sec （～ 1.4TB/day ⇒ ） 131 Mbps

Data conversion section（ＧＰＧＰＵ）

Data accumulation section

ＮＡＳ（14.5TB)

Offline collection section

Offline processing section

Monitoring control section

IQ data after DBF processing ( ～１ Gbps ）

IQ data before DBF processing（～ 6 Gbps ）

Data after radar processing（ 220 Mbps ）

DAS（１２TB) RAID

Antenna Equipment

（ 220 Mbps ）

Handai APServer

RAID（ 63TB)

Data Translate Server

RAID（42TB)

Osaka Univ. JGN-X Access Point (L2 Switch)

L3 Switch

ssh

ssh

Petabyte storage (Keihanna)

HUB （ GbE)

（ 220 Mbps ）

JGN-X （ NICT NW)Private NWOsaka Univ. NW

Osaka Univ.LAN

NICTScience Cloud

Data release server（ Koganei ）

Data analysis server（ Koganei ）

12 km

40 km

Kyoto60 km (radius)

Osaka Bay

SuitaAkashi

Kansai Airport

Nara

Uji

Kobe

0400JST

3-3. Stationary line-shaped rain- falls (18:51:20JST, July 22, 2012)

0400JST, Aug 14

2012

4-1. Data processing system

4-2. Publication (http://pawr.nict.go.jp)< Real-time data >

< Observation mode and data size / data rate >

< Past data >

< Evolution of cumulonimbus >

3-dim measurement using phased array

radar (10-30 sec)

3-dim measurement using a parabolic

antenna (5-10 min)