EXPERIMENTAL
The Phoenix Rainfall Index
Updated: 07:05 GMT on 13 Aug 2009
| Yesterday's PRI
| 0.00"
|
Number of Stations
With Rain (S)
| 9 of 128
(7.03%)
|
| Areal Average Precipitation (I)
| 0.02"
|
| One-Gage Maximum
| 0.79"
|
| PRI Since Aug 1
| 0.00"
|
| PRI Since Jan 1
| 1.86"
|
| PRI Since Oct 1
| 3.68"
|
| Monsoon 2009 PRI
| 0.11"
|
|
Yesterday's Rainfall Amounts
Click icons on map above for individual values.
0.00"
0.01-0.09"
0.10-0.24"
0.25-0.49"
0.50-0.74"
0.75-0.99"
1.00-1.49"
1.50-1.99"
2.00" +
ID,RAIN,LAT,LON
5400, 0.00, 33.434917, -112.334167
5405, 0.08, 33.511417, -112.323778
6810, 0.00, 33.447083, -112.555917
5415, 0.79, 33.533972, -112.471028
6820, 0.00, 33.450639, -112.494361
5430, 0.20, 33.567194, -112.558278
4920, 0.00, 33.887917, -111.953556
6530, 0.00, 33.305361, -111.845972
6595, 0.00, 33.168417, -111.841083
775, 0.00, 33.170833, -112.006028
5500, 0.31, 33.607389, -112.305694
5410, 0.71, 33.543972, -112.349417
5975, 0.00, 33.622361, -111.777417
5950, 0.00, 33.611139, -111.725139
5985, 0.00, 33.637111, -111.769194
5990, 0.00, 33.636639, -111.746556
5995, 0.00, 33.654306, -111.786139
5980, 0.00, 33.621250, -111.748722
5965, 0.00, 33.594556, -111.733194
5970, 0.00, 33.606417, -111.751056
6620, 0.00, 33.327694, -111.746694
6580, 0.00, 33.263083, -111.725639
6605, 0.00, 33.357333, -111.772750
5520, 0.00, 33.621611, -112.202639
4770, 0.00, 33.543639, -112.193556
5505, 0.00, 33.536639, -112.282222
6890, 0.00, 33.269472, -112.320944
6850, 0.00, 33.389056, -112.392472
6840, 0.00, 33.320333, -112.482139
6900, 0.00, 33.099250, -112.435417
6880, 0.00, 33.223389, -112.309528
6520, 0.00, 33.358306, -111.890861
6570, 0.00, 33.405528, -111.710361
4555, 0.00, 33.454583, -111.729306
4540, 0.00, 33.428111, -111.827000
4530, 0.00, 33.400861, -111.851944
6540, 0.00, 33.381944, -111.827333
4550, 0.00, 33.430639, -111.770444
6625, 0.00, 33.440000, -111.590333
4560, 0.00, 33.472972, -111.681639
6655, 0.00, 33.494806, -111.641083
6640, 0.00, 33.464750, -111.607556
6650, 0.00, 33.481278, -111.615861
5490, 0.00, 33.929278, -112.529750
5580, 0.00, 33.900972, -112.054972
5625, 0.00, 33.895944, -112.149583
780, 0.00, 33.087194, -111.686833
4805, 0.00, 33.513694, -111.999639
4790, 0.00, 33.536056, -111.974028
5525, 0.00, 33.583500, -112.239389
5595, 0.12, 33.637972, -112.239556
5610, 0.00, 33.735861, -112.225472
4815, 0.00, 33.579667, -112.054806
4810, 0.00, 33.543694, -112.051417
4820, 0.00, 33.584000, -112.154250
4835, 0.00, 33.572917, -112.104417
5535, 0.35, 33.677222, -112.154000
6550, 0.00, 33.327806, -111.989722
4900, 0.00, 33.717000, -112.044472
4830, 0.00, 33.599694, -112.112028
4915, 0.00, 33.792306, -111.996306
4500, 0.00, 33.369333, -112.142167
5550, 0.00, 33.690222, -112.066278
4800, 0.00, 33.562167, -112.031556
4700, 0.00, 33.426639, -112.118611
4645, 0.00, 33.669806, -112.025361
4680, 0.00, 33.646083, -112.039167
4655, 0.00, 33.649056, -112.010417
4665, 0.00, 33.627944, -112.080750
4715, 0.00, 33.478361, -112.117222
4840, 0.00, 33.625500, -112.129472
6500, 0.00, 33.371944, -111.970472
4690, 0.00, 33.581417, -111.968417
4640, 0.00, 33.603694, -112.004472
4710, 0.00, 33.446694, -112.079500
4775, 0.00, 33.531111, -112.113750
4760, 0.00, 33.498639, -112.187778
4780, 0.00, 33.516083, -112.048222
5630, 0.00, 33.863000, -112.184167
4745, 0.00, 33.461500, -111.982250
4740, 0.00, 33.459750, -111.968278
4650, 0.00, 33.654806, -112.007167
4730, 0.00, 33.478333, -112.014417
4850, 0.00, 33.601306, -112.072611
4510, 0.00, 33.400028, -112.070528
4515, 0.00, 33.426083, -111.995694
4755, 0.00, 33.399806, -112.204028
5565, 0.08, 33.730083, -112.119750
6560, 0.00, 33.315167, -112.133639
6510, 0.00, 33.344389, -112.033083
6525, 0.00, 33.346833, -112.084583
4635, 0.00, 33.581694, -111.984528
4720, 0.00, 33.477694, -112.041472
4750, 0.00, 33.479694, -111.978889
6710, 0.00, 33.230278, -111.594278
6610, 0.00, 33.261472, -111.628861
750, 0.00, 33.002639, -111.674111
4580, 0.00, 33.505111, -111.787139
5900, 0.00, 33.717639, -111.684222
4695, 0.00, 33.610056, -111.865444
4930, 0.00, 33.852972, -111.864389
5930, 0.00, 33.761111, -111.813833
4625, 0.00, 33.507778, -111.936389
4610, 0.00, 33.534444, -111.914222
4615, 0.00, 33.495083, -111.911222
4620, 0.00, 33.533167, -111.897889
4600, 0.00, 33.449222, -111.914833
4675, 0.00, 33.563667, -111.899722
4660, 0.00, 33.588194, -111.806389
5915, 0.00, 33.700667, -111.745278
4605, 0.00, 33.485111, -111.942667
4670, 0.00, 33.728417, -111.893250
4590, 0.00, 33.654667, -111.895500
4595, 0.00, 33.667917, -111.867056
4935, 0.00, 33.734472, -111.843639
5945, 0.00, 33.644417, -111.812139
4630, 0.00, 33.610556, -111.922444
5515, 0.00, 33.665472, -112.356667
5510, 0.04, 33.636778, -112.341250
5445, 0.00, 33.677000, -112.423500
5435, 0.00, 33.685306, -112.408639
5465, 0.00, 33.681056, -112.476000
5450, 0.00, 33.734944, -112.577194
4525, 0.00, 33.412972, -111.930861
4520, 0.00, 33.433972, -111.961333
4765, 0.00, 33.441194, -112.221917
5460, 0.00, 33.784306, -112.500222
5455, 0.00, 33.770500, -112.521028
Phoenix, Arizona is a vast, sprawling metropolis which covers an area of approximately 5000 km² (1900 mi²).
Historically, the “official” rain gauge for the Phoenix Metropolitan Area (PMA) has been situated near the center
of the city. Since 1933, the official rain gauge has resided at Phoenix Sky Harbor International Airport (KPHX).
While KPHX may have adequately represented Phoenix for the first half of the 20th century, it has become apparent
that a single observation station can no longer properly represent the spatial and temporal distribution of
precipitation over the PMA, especially during single day summer convective events associated with the North American Monsoon.
In order to better represent rainfall across the PMA, and compare and contrast precipitation events over the PMA,
a Phoenix Rainfall Index (PRI) has been created.
The PRI, based on precipitation observed at up to 132 ALERT rain gauges across the PMA (operated by the
Flood Control District of Maricopa County),
incorporates both a spatial coverage term (S) and a precipitation intensity/magnitude term (I).
It should be noted that the rain gages measure precipitation in millimeters (increments of 0.04"). Therefore, any precipitation
less than 1 mm/0.04" will likely not be measured by the rain gages. Coupled with mathematical rounding, it is very likely there
will be days when precipitation falls across the PMA yet the PRI is 0.00". When this happens it is reflective of either a very
light or very isolated precipitation event. Also, please be aware that the rainfall data are only passed through minimal
quality control mechanisms. The most common error will be light precip amounts at individual gages when no rain actually occurred.
A ten year climatology of the PRI reveals that it sufficiently captures the annual trends in precipitation events across
the PMA, while daily records adequately showcase extreme precipitation events. Daily calculation and dissemination of the PRI
should be a very useful tool for the local Weather and Climate Enterprise. The PRI dataset may also be useful for research
related to precipitation across the PMA.
| 0.02 | 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.02 | 0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 0.02 | 0.02 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.02 | 0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 0.02 | 0.02 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.02 | 0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 0.02 | 0.02 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.02 | 0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 0.02 | 0.02 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.02 | 0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.02 | 0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.01 | 0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.02 | 0.03 | 0.03 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.03 | 0.03 | 0.03 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.03 | 0.03 | 0.03 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.01
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.00 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.00 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.00 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.00 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.00 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | 0.03 | 0.02 | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | | 0.02 | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 | 0.02 | 0.01 | 0.02
|
| 0.03 | | 0.02 | | 0.00 | | 0.02 | 0.01 | | 0.02 | | 0.02
|
| 0.79 | 0.96 | 0.78 | 0.36 | 0.04 | 0.06 | 0.51 | 0.49 | 0.34 | 0.52 | 0.41 | 0.47
|
| Top 5 Daily Values by Month
|
| Month
| Spatial (S)
(percent)
| Intensity (I)
(inches)
| Phoenix Rainfall
Index (PRI)
(inches)
|
| JAN
| 1. 3 JAN 2005 - 1.00
2. 3 JAN 2005 - 1.00
3. 26 JAN 2005 - 1.00
4. 7 JAN 2008 - 1.00
5. 27 JAN 2008 - 1.00
| 1. 27 JAN 2008 - 1.32
2. 3 JAN 2005 - 0.90
3. 27 JAN 2001 - 0.76
4. 4 JAN 2005 - 0.57
5. 12 JAN 2001 - 0.55
| 1. 27 JAN 2008 - 1.32
2. 3 JAN 2005 - 0.90
3. 27 JAN 2001 - 0.76
4. 4 JAN 2005 - 0.57
5. 12 JAN 2001 - 0.55
|
| FEB
| 1. 13 FEB 2003 - 1.00
2. 25 FEB 2003 - 1.00
3. 11 FEB 2005 - 1.00
4. 28 FEB 2005 - 1.00
5. 19 FEB 2005 - 1.00
| 1. 13 FEB 2003 - 1.54
2. 11 FEB 2005 - 0.99
3. 19 FEB 2005 - 0.83
4. 25 FEB 2003 - 0.74
5. 23 FEB 2004 - 0.73
| 1. 13 FEB 2003 - 1.54
2. 11 FEB 2005 - 0.99
3. 19 FEB 2005 - 0.83
4. 25 FEB 2003 - 0.74
5. 23 FEB 2004 - 0.72
|
| MAR
| 1. 16 MAR 2003 - 1.00
2. 5 MAR 2005 - 1.00
3. 7 MAR 2001 - 0.99
4. 11 MAR 2006 - 0.99
5. 22 MAR 2007 - 0.99
| 1. 11 MAR 2006 - 1.40
2. 6 MAR 2000 - 1.27
3. 7 MAR 2001 - 0.80
4. 22 MAR 2007 - 0.70
5. 5 MAR 2000 - 0.65
| 1. 11 MAR 2006 - 1.39
2. 6 MAR 2000 - 1.24
3. 7 MAR 2001 - 0.79
4. 22 MAR 2007 - 0.69
5. 5 MAR 2000 - 0.63
|
| APR
| 1. 1 APR 1999 - 0.98
2. 2 APR 1999 - 0.98
3. 21 APR 2001 - 0.98
4. 2 APR 2004 - 0.98
5. 23 APR 2005 - 0.98
| 1. 2 APR 2004 - 1.12
2. 2 APR 1999 0 0.59
3. 5 APR 2001 - 0.39
4. 11 APR 2009 - 0.38
5. 1 APR 1999 - 0.26
| 1. 2 APR 2004 - 1.11
2. 2 APR 1999 - 0.58
3. 11 APR 2009 - 0.36
4. 5 APR 2001 - 0.34
5. 1 APR 1999 - 0.26
|
| MAY
| 1. 22 MAY 2009 - 0.95
2. 23 MAY 2008 - 0.94
3. 21 MAY 2009 - 0.75
4. 22 MAY 2008 - 0.64
5. 24 MAY 2008 - 0.54
| 1. 22 MAY 2008 - 0.23
2. 22 MAY 2009 - 0.18
3. 23 MAY 2008 - 0.15
4. 21 MAY 2009 - 0.09
5. 24 MAY 2008 - 0.03
| 1. 22 MAY 2009 - 0.17
2. 22 MAY 2008 - 0.15
3. 23 MAY 2008 - 0.14
4. 21 MAY 2009 - 0.07
5. 24 MAY 2008 - 0.02
|
| JUN
| 1. 28 JUN 2000 - 0.53
2. 22 JUN 2000 - 0.50
3. 2 JUN 1999 - 0.46
4. 29 JUN 2000 - 0.34
5. 20 JUN 2000 - 0.33
| 1. 28 JUN 2000 - 0.12
2. 20 JUN 2000 - 0.08
3. 23 JUN 2000 - 0.07
4. 22 JUN 2000 - 0.06
5. 2 JUN 1999 - 0.06
| 1. 28 JUN 2000 - 0.06
2. 22 JUN 2000 - 0.03
3. 20 JUN 2000 - 0.03
4. 2 JUN 1999 - 0.03
5. 29 JUN 2000 - 0.02
|
| JUL
| 1. 10 JUL 2008 - 0.99
2. 14 JUL 1999 - 0.95
3. 30 JUL 2001 - 0.95
4. 29 JUL 2003 - 0.95
5. 15 JUL 1999 - 0.93
| 1. 10 JUL 2008 - 0.80
2. 14 JUL 1999 - 0.60
3. 25 JUL 2006 - 0.54
4. 14 JUL 2002 - 0.49
5. 29 JUL 2003 - 0.44
| 1. 10 JUL 2008 - 0.80
2. 14 JUL 1999 - 0.57
3. 25 JUL 2006 - 0.44
4. 29 JUL 2003 - 0.42
5. 14 JUL 2002 - 0.41
|
| AUG
| 1. 2 AUG 2005 - 0.99
2. 14 AUG 2003 - 0.97
3. 3 AUG 2005 - 0.97
4. 25 AUG 2008 - 0.95
5. 12 AUG 2006 - 0.94
| 1. 2 AUG 2005 - 1.01
2. 28 AUG 2008 - 0.54
3. 14 AUG 2003 - 0.51
4. 25 AUG 2008 - 0.50
5. 7 AUG 2008 - 0.47
| 1. 2 AUG 2005 - 1.00
2. 14 AUG 2003 - 0.49
3. 25 AUG 2008 - 0.48
4. 7 AUG 2008 - 0.43
5. 28 AUG 2008 - 0.41
|
| SEP
| 1. 19 SEP 1999 - 0.98
2. 2 SEP 2006 - 0.97
3. 7 SEP 2002 - 0.93
4. 6 SEP 2002 - 0.90
5. 4 SEP 1998 - 0.86
| 1. 2 SEP 2006 - 0.51
2. 19 SEP 1999 - 0.40
3. 6 SEP 2002 - 0.36
4. 19 SEP 2004 - 0.34
5. 7 SEP 2002 - 0.30
| 1. 2 SEP 2006 - 0.49
2. 19 SEP 1999 - 0.39
3. 6 SEP 2002 - 0.32
4. 19 SEP 2004 - 0.30
5. 7 SEP 2002 - 0.28
|
| OCT
| 1. 21 OCT 2004 - 1.00
2. 28 OCT 2004 - 1.00
3. 21 OCT 2000 - 0.98
4. 22 OCT 2000 - 0.98
5. 27 OCT 2000 - 0.98
| 1. 27 OCT 2000 - 0.74
2. 22 OCT 2000 - 0.68
3. 28 OCT 2004 - 0.47
4. 10 OCT 2000 - 0.47
5. 10 OCT 2003 - 0.37
| 1. 27 OCT 2000 - 0.72
2. 22 OCT 2000 - 0.66
3. 28 OCT 2004 - 0.47
4. 10 OCT 2000 - 0.43
5. 21 OCT 2004 - 0.33
|
| NOV
| 1. 22 NOV 2004 - 1.00
2. 30 NOV 2007 - 1.00
3. 29 NOV 2002 - 0.99
4. 12 NOV 2003 - 0.98
5. 27 NOV 2008 - 0.98
| 1. 30 NOV 2007 - 1.55
2. 12 NOV 2003 - 0.80
3. 29 NOV 2002 - 0.34
4. 27 NOV 2008 - 0.34
5. 22 NOV 2004 - 0.29
| 1. 30 NOV 2007 - 1.55
2. 12 NOV 2003 - 0.78
3. 29 NOV 2002 - 0.33
4. 27 NOV 2008 - 0.33
5. 22 NOV 2004 - 0.29
|
| DEC
| 1. 4 DEC 2001 - 1.00
2. 4 DEC 2004 - 1.00
3. 6 DEC 2004 - 1.00
4. 29 DEC 2004 - 1.00
5. 5 DEC 2004 - 0.99
| 1. 29 DEC 2004 - 0.69
2. 4 DEC 2001 - 0.58
3. 16 DEC 2008 - 0.49
4. 7 DEC 2007 - 0.36
5. 8 DEC 2007 - 0.34
| 1. 29 DEC 2004 - 0.69
2. 4 DEC 2001 - 0.58
3. 16 DEC 2008 - 0.48
4. 7 DEC 2007 - 0.35
5. 8 DEC 2007 - 0.31
|
| Top 5 Seasonal Values
|
Monsoon
(JUN 15 - SEP 30)
| 1. 2008 - 3.01
2. 1999 - 2.49
3. 2006 - 2.39
4. 2005 - 1.81
5. 2002 - 1.52
|
Winter
(DEC 1 - MAR 31)
| 1. 2004-2005 - 7.76
2. 2002-2003 - 4.79
3. 2007-2008 - 3.69
4. 2000-2001 - 3.56
5. 2008-2009 - 2.49
|
Daily PRI values from 1 June 1998 through yesterday.
www.weather.gov 
