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Quantitative Precipitation Forecast (QPF) Discussion
 
(Latest Discussion - Issued 0618Z Dec 08, 2016)
 
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Abbreviations and acronyms used in this product
 
Geographic Boundaries -  Map 1: Color  Black/White       Map 2: Color  Black/White


QUANTITATIVE PRECIPITATION FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
118 AM EST THU DEC 08 2016


PRELIM DAY 1 QPF DISCUSSION
VALID DEC 08/1200 UTC THRU DEC 09/1200 UTC
REFERENCE AWIPS GRAPHICS UNDER...PRECIP ACCUM - 24HR


DAY 1

...PACIFIC NORTHWEST/CALIFORNIA TO THE NORTHERN ROCKIES... 
 
A LOW-AMPLITUDE SHORTWAVE RIDGE CENTERED ALONG THE PACIFIC
NORTHWEST/NORTHERN CA COASTS EARLY THU IS EXPECTED TO SHIFT EAST
INTO THE INTERMOUNTAIN WEST BY EARLY FRI...GIVING WAY TO AN
APPROACHING SHORTWAVE TROUGH...WITH A MID LEVEL CENTER CLOSING OFF
WEST OF VANCOUVER ISLAND.  WARM ADVECTION PRECIPITATION CENTERED
ACROSS NORTHERN CA THU MORNING IS FORECAST TO LIFT NORTH AND EAST
AHEAD OF THE APPROACHING SYSTEM...WITH LIGHT TO MODERATE AMOUNTS
SPREADING INTO THE NORTHERN INTERMOUNTAIN WEST/ROCKIES. 
INCREASING ONSHORE FLOW/UPPER FORCING AHEAD OF THE APPROACHING LOW
WILL AFFORD AN INCREASE IN COVERAGE/AMOUNTS ACROSS WESTERN
ORE/SOUTHWESTERN WA LATE THU INTO FRI...WITH LOCALLY HEAVY AMOUNTS
POSSIBLE ALONG THE FAVORED TERRAIN.  AS WARM MOIST AIR FROM THE
PACIFIC MOVES ACROSS THE TOP OF A SHALLOW ARCTIC AIRMASS...THIS
SYSTEM IS EXPECTED TO PRODUCE A VARIETY OF PRECIPITATION TYPES
ACROSS WESTERN WA/ORE...INCLUDING SLEET/FREEZING RAIN ACROSS THE
VALLEYS AND LOWLANDS OF REGION.  HEAVY SNOWS WILL BE POSSIBLE IN
HIER ELEVATIONS OF THE CASCADES.  REFER TO THE WINTER WEATHER
SUITE OF PRODUCTS FOR FURTHER DETAILS ON THE POTENTIAL HEAVY SNOW
AND ACCUMULATING ICE ACROSS THIS REGION.
 
FURTHER TO THE SOUTH...A PLUME OF RELATIVELY ANOMALOUS MOISTURE
EXTENDING FROM THE PACIFIC INTO CENTRAL CA INTERACTING WITH ENERGY
ALOFT IS EXPECTED TO FUEL PERIODS OF LIGHT TO MODERATE
PRECIPITATION ALONG THE CENTRAL CA COASTAL RANGES INTO THE
INTERIOR VALLEYS AND SIERRA. 
 
...GREAT LAKES... 
 
STRONG COLD AIR ADVECTION AND DEEP CYCLONIC FLOW IN THE WAKE OF A
LOW MOVING ACROSS SOUTHERN QUE INTO ATLANTIC CANADA WILL SUPPORT
LAKE EFFECT ACTIVITY WITH LOCALLY HEAVY ACCUMULATIONS POSSIBLE IN
THE LEE OF THE GREAT LAKES.  HEAVY ACCUMULATIONS ARE LIKELY IN LEE
OF THE LOWER LAKES AS SOUTHWESTERLY-WESTERLY FLOW PROMOTES SINGLE
BAND SNOWS INTO NORTHEAST PA/WESTERN NY AND THE TUG HILL REGION OF
NY.  REFER TO THE WPC WINTER WEATHER SUITE OF PRODUCTS FOR FURTHER
DETAILS.


GRAPHICS AVAILABLE ON THE WEB AT www.wpc.ncep.noaa.gov/qpf/qpf2.shtml

PEREIRA

24HR QP VT 09/12Z
 0.01 497294 499285 501276 500261 499248 499240 500232 501225
      498220 496214 497205 499201 497194 495189 490187 486188
      483187 482185 480178 479175 479170 480162 479156 480148
      479141 476129 474124 472116 471110 468105 468100 466095
      460085 456081 451078 445072 442069 442073 444077 448080
      451084 449091 445093 439092 435090 431091 426088 424087
      422089 426097 426100 425101 420102 416105 412103 406095
      401104 395105 392109 385114 381117 378122 374125 376130
      384127 395127 399130 405131 411132 416132 414136 410139
      402141 397140 392141 389141 389143 384145 383147 385148
      389151 391156 392159 391163 386170 385175 386176 389178
      391179 394180 397182 398187 398194 397197 395196 390194
      385191 381188 377184 373181 368180 357179 352180 349185
      351188 357191 360194 363198 363202 360202 355201 350198
      346194 343194 341195 342197 342208 345219 345227 347231
      349237 352239 362240 366240 369240 371243 369258 371263
      375263 383260 390255 393254 394256 398260 403262 410263
      415263 418264 429267 439270 439278 438282 440285 444293
      450302 453306 458308 464310 469309 476303 479298 482301
      492302 494301 495298 497294
 0.01 492661 492656 490656 486656 480669 476680 472691 466694
      463695 460694 457693 454695 451699 449706 444709 439713
      439719 437724 431728 430731 433731 439732 441734 440736
      439740 436741 429748 421762 420766 417766 415771 414778
      411783 410786 407787 405789 401790 388794 384797 383801
      384803 391801 396803 400799 403797 405799 408805 409808
      410813 411821 413826 417828 419823 422817 425816 427818
      431823 438830 442833 443837 442841 439846 433848 425843
      421843 419841 416837 412833 408831 410841 411850 412858
      414864 418868 422871 428871 441871 447871 452872 455874
      455878 456888 451901 450908 449911 446911 445911 445914
      445919 446921 459933 464945 466952 467957 467962 467967
      469967 474965 478967 481967 482965 486962 489956 491949
      489940 485909 484906 484902 483899 481898 477904 476912
      473916 471913 472908 475897 478891 482887 488884 487882
      478859 475852 472849 465839 463832 462827 463823 465809
      466801 464793 461787 457783 453785 450780 447781 444786
      442792 439787 438782 439777 440771 446759 452751 455745
      454737 453731 457726 465719 478715 477712 475709 481698
      486687 488681 490675 492668 492661
 0.01 460639 457632 454628 451628 448630 445635 442641 439646
      430654 426659 423664 422670 423679 426684 430687 434688
      439685 441679 444672 451662 456658 458652 459646 460639
 0.01 424065 425060 424054 424048 420048 416055 412056 408054
      404053 401055 396059 384070 377073 375076 375082 376087
      376093 376098 379099 379090 379085 384083 388082 392084
      394092 396094 396088 397080 401078 405078 408080 412080
      415072 417068 421066 424065
 0.01 388758 387751 385749 383750 376753 369752 365753 364755
      364760 365764 366766 371770 376770 383768 386763 388758
 0.01 231975 236989 238994 242998 261015 266018 269019 273020
      279022 287023 300028 302034 306039 310045 312047 316048
      319050 324049 326046 322042 320039 319034 321025 323018
      325012 326003 323988 323979 321972 322962 323959 323954
      323949 322946 319943 318944 316949 314956 310990 311998
      311003 310008 309015 307019 303019 299017 297015 292011
      284001 282994 281991 282985 284979 288975 292971 296965
      301954 304946 307939 307930 307922 306914 304907 298893
      295887 291883 287883 285885 283885 282889 280895 279897
      277896 275894 269890 263890 257891 250894 245897 241902
      238907 238915 235931 233938 230944
 0.01 281794 280784 277777 272762 266747 263741 256741 252747
      250753 247768 245776 243782 236793 232806 229820 230825
      231828 235833 238834 240832 243825 248813 251811 253813
      255815 256820 254826 254835 256842 258850 260853 264855
      266856 269855 274851 278846 281838 282831 281823 280815
      279808 280803 280797 281794
 0.25 484268 485256 485245 481232 477227 474224 476220 482218
      486218 487215 484209 481207 476207 472205 465204 461202
      457196 455193 456188 458180 457175 455172 454164 452156
      449150 444145 437143 431143 427143 424145 427150 432157
      434163 434168 434176 433181 432185 435191 437199 438205
      434210 422207 419214 415210 409209 403206 390197 378190
      373186 367184 360184 356184 355186 362189 368194 372199
      375204 379209 380212 380216 378217 375215 369213 364211
      357206 354205 350205 348208 349213 351219 356225 368228
      377230 381231 386233 394242 400245 406248 413249 420250
      448251 454252 461255 469266 474271 478274 479273 480269
      484268
 0.25 474882 473876 472872 470863 468859 465857 462859 460863
      461871 463881 465890 463898 463903 465905 467903 468893
      471887 474882
 0.25 455859 455856 454852 452850 449850 448851 444853 443854
      441856 439858 440861 443863 445864 448864 452863 453862
      455859
 0.25 449811 449807 447805 443805 440808 438809 435811 434814
      433816 434819 436821 439821 442821 446819 447817 448814
      449811
 0.25 444749 443747 439747 436746 434749 433752 432756 433761
      433766 434770 436770 438768 439765 439762 441758 442755
      443752 444749
 0.25 443108 440105 434103 431109 428108 424109 421114 416114
      410113 408109 403109 393112 390115 391118 394118 404122
      410123 416123 421123 423123 425120 427115 431112 441110
      443108
 0.25 424232 424231 422230 421228 419227 418228 419228 421229
      421231 422231 424232 424232
 0.25 428788 427784 422783 419787 418792 417797 417802 416809
      418814 420811 422806 424801 425798 427793 428788
 0.25 419161 421157 420152 419150 415149 412149 408149 406149
      404151 403155 404159 406161 408162 412163 413165 415165
      417163 419161
 0.25 428862 428860 427859 427857 425856 425855 424854 423853
      422852 420851 419853 419856 420858 420859 421860 422862
      424864 426864 428862 428862
 0.25 387219 387217 386217 385219 386220 387219
 0.25 283952 281946 279943 275940 272935 268925 264917 259907
      257905 253908 248917 247922 246929 246935 244940 237947
      235951 233956 232961 232965 234971 237974 244981 246987
      248991 252994 257995 261992 261987 260981 263977 272972
      277966 282959 283952
 0.25 272799 272792 270787 267783 264780 255777 251779 249784
      244793 241802 239807 239813 242814 243812 245808 249805
      252804 255806 259808 264809 271804 272799
 0.50 477240 478235 475233 469234 467226 468220 469215 466212
      460208 455205 452205 450208 448211 445212 439214 428218
      426221 427225 431229 436233 435241 439243 445242 451241
      459243 465242 470238 475242 477240
 0.50 429245 431242 430240 427237 418233 413231 413227 414221
      414216 409215 405212 399206 393201 386196 379192 371189
      368189 372195 383207 389213 396217 405221 406229 401234
      402238 406241 414244 418246 423247 429245
 0.50 441154 441153 440151 438150 437151 437153 437155 439156
      441155 441154
 0.50 439758 439755 439753 438751 436751 435753 435754 435756
      435758 435761 436762 436763 438764 438763 438760 439758
      439758
 0.50 425791 425789 424789 423788 422789 421791 421792 420794
      420796 419797 419799 419801 420803 421801 422800 422799
      423797 424796 425794 425793 425791
 0.50 408119 408117 406114 405112 403112 401112 399113 398115
      399116 401117 403118 404118 404119 406119 408119 408119
 0.50 375225 375221 372216 371215 367217 363214 360211 357209
      354208 353211 354216 357220 360222 366223 371226 375225
 0.50 276960 275954 272947 269943 267937 262927 257924 254929
      252935 250940 247946 243949 239952 235955 233962 235967
      239971 244972 252973 257971 268967 273964 276960
 0.50 269798 269793 267790 263787 258786 254786 252788 249792
      246798 248801 253800 257803 261805 265802 269798
 1.00 461223 461218 456215 451215 447215 444216 440218 437221
      437224 439225 444226 448225 451222 455222 460223 461223
 1.00 425242 424240 423239 422238 421238 419237 418237 417237
      416239 417240 419241 420242 422243 424243 425242
 1.00 411221 411220 410218 409218 409220 409223 410223 411222
      411221
 1.00 402216 400211 398208 395205 391202 387199 384197 379197
      382200 385204 388208 391211 394214 398216 402216
 1.00 364218 363217 362215 362214 360213 358213 358214 358215
      359217 361219 363219 364218
 1.00 260962 260956 257952 254951 250953 246954 243956 239959
      241965 243968 248969 254968 257966 259963 260962
 1.50 448221 447219 445219 443219 441220 443222 445223 446223
      448221
 1.50 400213 399211 398210 397208 395206 394205 393205 392204
      390203 389204 389206 390206 392208 392209 393210 395212
      396213 398214 400213
 2.00 397210 395208 395207 394207 393207 393208 394209 395210
      397211 397210