1 EXWW workmeeting Hotel Admiral, Bergen, June 12-14th 2007 Presentations by met.no Vervarslinga på Vestlandet / Geofysisk institutt, UiB Ekofisk II under bygging

2 EXWW A RISK REDUCING WARNING SYSTEM

3 EXWW-meeting, Bergen 12-14th june 2007 EXWW og VXWW historical review in short •EXWW: Ekofisk eXtreme Wave Warning –Phillips Petroleum Norge, later ConocoPhillips –First meeting january 1991 after storm –Warning procedures every winter since fall 1991 (16 seasons) –Meetings every year to review procedures, find potentials for improvements •VXWW: Valhall eXtreme Wave Warning –First meetings in 2003 (Colin Grant, Asbjørn Tansø) –VXWW since fall 2004 (3 seasons)

4 EXWW-meeting, Bergen 12-14th june 2007 EXWW •Specific procedures for  Monitoring  Forecasting  Communication  Backups •Specific contingency (Oct-Apr) •Specific forecasters –Anne Karin Magnusson ( 16 yrs EXWW forecasting ) –Magnar Reistad ( 16 yrs ) –Øyvind Breivik (6 yrs ) –Kristine Gjesdal ( 1 yr + 20yrs statsmeteorolog)

5 EXWW-meeting, Bergen 12-14th june 2007 Monitoring procedures - XWW team  2 XWW-forecasters (XW1 and XW2) are at watch all winter (2 of 4 dedicated wave-special forecasters) ‘  2 levels of contingency:  ‘LOW’ ::: > “small chances of a high waves”  ‘HIGH’ ::: > “there is storm activity central North Sea” Levels are determined twice a day, by the duty- forecaster, after each issue of a new marine forecast. CRITERIA for CONTINGENCY LEVELS (dev ) Forecast Day 1 ( hours) Forecast Day 2 ( hours) Forecast Day 3-4 LOW CONTINGENCY Hs < 4 mHs < 6mHs < 7.5 m HIGH CONTINGENCY Hs > 4mHs > 6mHs > 7.5 m XW1’: has responsibility to distribute watch hours and to determine, at HIGH level of contingency, weather there is a forecasting situation or not. ‘XW2’: is backup and shall step into a watch if necessary.

6 EXWW-meeting, Bergen 12-14th june 2007 EXWW Activity and Communication Before a storm Under a storm After the storm Previously defined (actions on 3 hrly forecasts)

7 EXWW-meeting, Bergen 12-14th june 2007 EXWW - EXWW - VALIDATION –Large annual variations of number of EXWW storms ( 2 to 12 cases) •NB: (forecast criterium was Hs>8m before 1995, now Hs > 7m) –85 storms, 77 included in validation, of which 30 with Hs > 9 m

8 EXWW-meeting, Bergen 12-14th june 2007 SUMMARY of EXWW VALIDATION •77 storms: –average error in forecasted culmination wave height is 0.06 m for all 77 storms. • = 0.06 m • Std = 0.54 m •For highest storms (Hs or Hec>9m, in 38% of EXWW cases) • = m • Std = 0.47 m •The first EXWW forecast is sent in average 10 hours before culmination (std=6,4hrs) •For highest waves: 13.7 hrs before (std=5,5 hrs)

9 EXWW-meeting, Bergen 12-14th june 2007 New procedures since 2007 (2MO, 3/6-08) •Valhall and Ekofisk have to demobilise at very high Hs values, some criteria are related to problems with lifeboats •Met.no has to warn these situations 3 days ahead, because Copno need 2-3 days to unmann 1000 persons at the most (but lower Hs levels do not require as much). •Next slide: data and history (right) of maximum Hec value sent in warnings up to 4 days ahead.

10 EXWW-meeting, Bergen 12-14th june 2007 Andrea 9. nov 2007 kl 8

11 EXWW-meeting, Bergen 12-14th june 2007 Historie bak bildet ”Supply_sjø.JPG” ( 19.juni 2006) Lars, (Lars Golmen, NIVA) Sorry to say but we are not surprised that you cannot find anybody at the Norne field who knows about this photo - It's a FAKE. The original photo of the vessel was taken offshore Newfoundland - copy attached. Regards Niels F Hansen Chartering and Operations - Canada, Far East, Cable Maersk Supply Service Copenhagen - Denmark Tel: Fax:

12 EXWW-meeting, Bergen 12-14th june 2007 EXWW møte Juni 2008 EXWW meeting Juni 2008 Hotel Edvard Grieg Suitell, Sandsli Stormer og prosedyrer

13 EXWW-meeting, Bergen 12-14th june 2007 ANDREA STORMEN (name confusion with extrem weather warnings to the public)

14 EXWW-meeting, Bergen 12-14th june 2007 Veldig media kjør under Andrea • : evakuering av oljearbeiderehttp:// • : tiltak i Bergen Kommunehttp:// …m.m. ….. Navne forvirring skapte forventninger om ekstrem vær på land … mye snø… kaos i vente … mange bilister skiftet til vinterdekk 

15 EXWW-meeting, Bergen 12-14th june 2007 Ekstremværvarsel: PER Nyhet fra Meteorologisk institutt Ekstremværvarsel: PER Det er sendt ut ekstremværvarsel fra Meteorologisk institutt, Vervarslinga på Vestlandet. Varselet lyder som følger: Natt til søndag 14.januar 2007 ventes kortvarig vest senere nordvest sterk storm i kystområdene av Rogaland, Hordaland og Sogn. Mens et ekstremvær pågår sendes nye værvarsler hver 3. - hver 6. time. Varselet formidles da til : •Justisdepartementet - beredskap •Fylkesmannen i de fylkene som rammes av været - beredskap •Politimyndigheten i det aktuelle området – i tilfelle evakuering •Kommunale etater i det aktuelle området – for å sikre verdier •Media – for å varsle allmennheten Det er Vervarslinga på Vestlandet som håndterer ekstremværet Per. De vil også sørge for at alle instanser inkl. mottar oppdatert varsel så snart det foreligger. Denne saken oppdateres ikke de nærmeste timene. Følg derfor værvarslene på våre obs-sider Kontaktpersoner for media: Vervarslinga på Vestlandet, tlf obs-sider Les mer: Om ekstremvær, navnsetting, navn på tidligere ekstremvær etc.Om ekstremvær, navnsetting, navn på tidligere ekstremvær etc.