date: februa ry 8, 2013€¦ · 5th percentile tile rainfall v 24-hour rainf alue was cal all depth...

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Date: Recipient Project: Subject: Tetra Tec data publi Summary and from the SOD g fifteen-mi region. The NCD alone cou coverage, but also fo meteorolo knowledg inversions the PRISM better repr precipitati download with the p Using bot totals) and Central C assigned t scaling fa requested the 85 th an was comp disaggreg 85 th and 9 1. A 0 E Februa : Tamar Prepar Task 2 Rainfa h previously ished by the N y of Day (SOD previous exp gages provide inute interval DC data are co uld not capture there was a n or orographic ogical data set ge of complex s). These data M approach ta resent orograp ion totals are ded and proce period of reco th of these dat d the spatial r oast regional to the nearest actors to spatia that the meth nd 95 th percen prised of 1,85 gated down fro 95 th percentile All days with m .1 inches wer EPA’s EISA T ary 8, 2013 ra Presser, Ce ration of 85 th 2 – Memo to E all Depths developed a s National Clim D) gages were erience proce e more reliabl s. These data ollected at spe e the full vari need to interp c influences. T t that incorpo x climatic extr a cover the en akes into acco phic influenc coarsely pred ssed for the p ord for which ta products to resolution (gri study area. F NCDC gage. ally adjust the hodology outl ntile rainfall d 3 PRISM grid om monthly t e 24-hour rain measurable ra re eliminated Technical Gui Te entral Coast R and 95 th Perc Explain Proce set of quality matic Data Cen e compiled an essing these d le daily rainfa were used as ecific location ability of rain polate rainfall The PRISM C orates observe remes (includ ntire contiguo ount elevation ces in areas w dicted in term period betwee the NCDC da ogether provid id-based PRIS For this analys . The monthly e associated N lined in EPAdepths, the res ds (each cove to a daily time nfall depths fo ainfall were q from the data idance Manua 9 l 858.268.5746 Regional Wate entile Precipi ess for Develo controlled ho nter (NCDC) nd processed. data for model all totals than s the basis for ns across the C nfall in the reg totals across Climate Group ed point data, ding rain shad us United Sta n in the spatia ithout gages. ms of monthly en October 19 ata had been p ded both the t SM coverage sis, every PRI y time series o NCDC time s s EISA Tech sulting rainfa ering a 4×4 km e step. Below or each of the queried and so aset to be cons al. 9444 Balboa Ave Fax 858.268.5 er Quality Co itation Maps oping 85 th an ourly rainfall for the Centr From past co ling purposes the gages tha r rainfall temp Central Coast gion. Because the region no p at Oregon S a digital elev dows, coastal ates at a 4×4 k al interpolatio The only lim y volumes. Th 948 and Septe processed pre temporal reso e) required to ISM grid in th of PRISM da eries data. Be hnical Guidan all dataset for m square) of t w is a list of st 1,853 4×4 km orted. Days w sistent with th enue, Suite 215, 5809 ontrol Board nd 95 th Percen time series us ral Coast regi orrespondenc s, it had been at collect data poral distribut t region; there e of gaps in th ot only to acc State Universi vation map, an effects, and t km spatial res on process, th mitation of this he PRISM dat ember 2010 to eviously. olution (daily derive isohye he Central Co ata were then ecause the pro nce Manual be generating th the Central C teps used for d m grid cells in with rainfall to he methodolo Tetra Tech , San Diego, CA www.tetratec ntile 24-hour sing all availa ion. Data from e with NCDC determined th a at hourly or tions across th efore, that dat he spatial count for dista ity maintains nd expert temperature solution. Beca he dataset is ab s dataset is th ta were o be consisten NCDC rainfa etal maps for oast region w essentially us oject specifica e used to calc he isohyetal m Coast region, developing th n the region. otals of less th ogy outlined b h, Inc. 92123 ch.com able m 44 C staff hat he taset ance, a ause ble to hat nt all the was sed as ally ulate maps he han by

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Date:

Recipient Project:

Subject:

Tetra Tecdata publiSummaryand from the SOD gfifteen-miregion.

The NCDalone coucoverage,but also fometeoroloknowledginversionsthe PRISMbetter reprprecipitatidownloadwith the p

Using bottotals) andCentral Cassigned tscaling farequested the 85th anwas compdisaggreg85th and 9

1. A0E

Februa

: Tamar

Prepar

Task 2

Rainfa

h previously ished by the N

y of Day (SODprevious expgages provideinute interval

DC data are could not capture there was a nor orographicogical data setge of complexs). These dataM approach taresent orograpion totals are

ded and proceperiod of reco

th of these datd the spatial roast regional to the nearest

actors to spatiathat the meth

nd 95th percenprised of 1,85gated down fro95th percentile

All days with m.1 inches wer

EPA’s EISA T

ary 8, 2013

ra Presser, Ce

ration of 85th

2 – Memo to E

all Depths

developed a sNational ClimD) gages wereerience procee more reliabls. These data

ollected at spee the full varineed to interpc influences. Tt that incorpo

x climatic extra cover the enakes into accophic influenccoarsely predssed for the p

ord for which

ta products toresolution (gristudy area. FNCDC gage.

ally adjust thehodology outlntile rainfall d3 PRISM gridom monthly t

e 24-hour rain

measurable rare eliminated Technical Gui

Te

entral Coast R

and 95th Perc

Explain Proce

set of quality matic Data Cene compiled anessing these dle daily rainfawere used as

ecific locationability of rain

polate rainfall The PRISM Corates observeremes (includntire contiguoount elevationces in areas wdicted in termperiod betweethe NCDC da

ogether providid-based PRIS

For this analys. The monthlye associated Nlined in EPA’depths, the resds (each coveto a daily timenfall depths fo

ainfall were qfrom the dataidance Manua

9l 858.268.5746

Regional Wate

entile Precipi

ess for Develo

controlled honter (NCDC) nd processed. data for modelall totals than s the basis for

ns across the Cnfall in the regtotals across

Climate Grouped point data, ding rain shadus United Stan in the spatiaithout gages.

ms of monthly en October 19ata had been p

ded both the tSM coveragesis, every PRIy time series oNCDC time s’s EISA Techsulting rainfaering a 4×4 kme step. Belowor each of the

queried and soaset to be consal.

9444 Balboa AveFax 858.268.5

er Quality Co

itation Maps

oping 85th an

ourly rainfall for the CentrFrom past co

ling purposes the gages tha

r rainfall temp

Central Coastgion. Becausethe region no

p at Oregon Sa digital elev

dows, coastal ates at a 4×4 kal interpolatioThe only lim

y volumes. Th948 and Septeprocessed pre

temporal resoe) required to ISM grid in thof PRISM daeries data. Be

hnical Guidanall dataset for m square) of t

w is a list of st1,853 4×4 km

orted. Days wsistent with th

enue, Suite 215,5809

ontrol Board

nd 95th Percen

time series usral Coast regiorrespondencs, it had been at collect dataporal distribut

t region; theree of gaps in thot only to accState Universivation map, aneffects, and tkm spatial reson process, th

mitation of thishe PRISM datember 2010 toeviously.

olution (daily derive isohyehe Central Co

ata were then ecause the pro

nce Manual begenerating ththe Central Cteps used for dm grid cells in

with rainfall tohe methodolo

Tetra Tech, San Diego, CA

www.tetratec

ntile 24-hour

sing all availaion. Data frome with NCDCdetermined th

a at hourly or tions across th

efore, that dathe spatial

count for distaity maintains nd expert temperature solution. Beca

he dataset is abs dataset is thta were o be consisten

NCDC rainfaetal maps for oast region wessentially usoject specificae used to calche isohyetal mCoast region, developing thn the region.

otals of less thogy outlined b

h, Inc.

92123ch.com

able m 44 C staff hat

he

taset

ance, a

ause ble to

hat

nt

all the

was sed as ally ulate

maps

he

han by

2. T

Figure 1. 8

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Figure 5. 9

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7

Figure 7. 9

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8

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