CHIRPS Reality Checks - Revision history

Harrison: /* July 2026 */

2026-08-24T22:02:20Z

July 2026

Harrison: /* July 2026 */

2026-08-24T22:00:37Z

July 2026

Harrison: /* July 2026 */

2026-08-24T21:52:55Z

July 2026

Harrison: /* July 2026 */

2026-08-24T21:45:31Z

July 2026

Harrison: /* July 2026 */

2026-08-24T21:17:33Z

July 2026

Harrison: /* June 2026 */

2026-08-24T21:06:30Z

June 2026

Harrison: /* June 2026 */

2026-07-15T15:42:48Z

June 2026

Harrison: /* June 2026 */

2026-07-15T15:38:11Z

June 2026

Harrison: /* June 2026 */

2026-07-15T15:07:59Z

June 2026

Harrison: /* June 2026 */

2026-07-15T15:03:06Z

June 2026

@@ Line 32: / Line 32: @@
 '''Station data update''' In the previous months that the SSOD source has been blended into CHIRPS, less than 900 stations have been included. This month over 3,000 SSOD stations were blended into CHIRPS.
-'''Ethiopia''' July 2026 CHIRPS Final data shows substantially higher July rainfall across central-northern Ethiopia and in a smaller region in western-central Ethiopia, compared to the CHIRP satellite-based estimate. The differences range from 25mm to 100+ mm, see [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/archive/Difference_africa_east_202607.png here]. Unfortunately, the July 2026 rainfall totals were very below average, according to CHIRPS Final. The data incorporates many stations from the Ethiopia Meteorological Institute.
+'''Ethiopia''' July 2026 CHIRPS Final data shows substantially higher July rainfall across central-northern Ethiopia and in a smaller region in western-central Ethiopia, compared to the CHIRP satellite-based estimate. The differences range from 25mm to 100+ mm, see [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/archive/Difference_africa_east_202607.png here]. Unfortunately, the July 2026 rainfall totals were still [https://data.chc.ucsb.edu/products/Early_Estimates/v3/Recent_Rainfall/observed/moving_06pentad/africa_east/pngs/archive/Anomaly_06PentAccum_2026_p42.png very below average], according to CHIRPS Final. The data incorporates many stations from the Ethiopia Meteorological Institute.
 '''Auto/manual screening''' Some stations in India, Thailand, Japan, and Bangladesh that were auto-screened out of the initial blending were found to be reasonable, and included into CHIRPS Final data. These reports had initially been excluded in the "too big-too small" automated quality control screening for their high values compared to satellite estimates.

← Older revision		Revision as of 22:00, 24 August 2026
Line 31:		Line 31:

	'''Station data update''' In the previous months that the SSOD source has been blended into CHIRPS, less than 900 stations have been included. This month over 3,000 SSOD stations were blended into CHIRPS.		'''Station data update''' In the previous months that the SSOD source has been blended into CHIRPS, less than 900 stations have been included. This month over 3,000 SSOD stations were blended into CHIRPS.
		+
		+	'''Ethiopia''' July 2026 CHIRPS Final data shows substantially higher July rainfall across central-northern Ethiopia and in a smaller region in western-central Ethiopia, compared to the CHIRP satellite-based estimate. The differences range from 25mm to 100+ mm, see [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/archive/Difference_africa_east_202607.png here]. Unfortunately, the July 2026 rainfall totals were very below average, according to CHIRPS Final. The data incorporates many stations from the Ethiopia Meteorological Institute.

	'''Auto/manual screening''' Some stations in India, Thailand, Japan, and Bangladesh that were auto-screened out of the initial blending were found to be reasonable, and included into CHIRPS Final data. These reports had initially been excluded in the "too big-too small" automated quality control screening for their high values compared to satellite estimates.		'''Auto/manual screening''' Some stations in India, Thailand, Japan, and Bangladesh that were auto-screened out of the initial blending were found to be reasonable, and included into CHIRPS Final data. These reports had initially been excluded in the "too big-too small" automated quality control screening for their high values compared to satellite estimates.

← Older revision		Revision as of 21:52, 24 August 2026
Line 33:		Line 33:

	'''Auto/manual screening''' Some stations in India, Thailand, Japan, and Bangladesh that were auto-screened out of the initial blending were found to be reasonable, and included into CHIRPS Final data. These reports had initially been excluded in the "too big-too small" automated quality control screening for their high values compared to satellite estimates.		'''Auto/manual screening''' Some stations in India, Thailand, Japan, and Bangladesh that were auto-screened out of the initial blending were found to be reasonable, and included into CHIRPS Final data. These reports had initially been excluded in the "too big-too small" automated quality control screening for their high values compared to satellite estimates.
		+
		+	''' Columbia''' In western coastal Columbia, CHIRPv3 estimated highly above average rainfall. CHIRPS shows below average rainfall in the northern part of this area due to several stations reporting that rainfall had been below average.

	'''Rchecks plots''' CHIRPS (with stations) was considerably wetter than CHIRP (without stations) globally and in Asia, recording the largest difference between the two on record for the month of July.		'''Rchecks plots''' CHIRPS (with stations) was considerably wetter than CHIRP (without stations) globally and in Asia, recording the largest difference between the two on record for the month of July.

← Older revision		Revision as of 21:45, 24 August 2026
Line 31:		Line 31:

	'''Station data update''' In the previous months that the SSOD source has been blended into CHIRPS, less than 900 stations have been included. This month over 3,000 SSOD stations were blended into CHIRPS.		'''Station data update''' In the previous months that the SSOD source has been blended into CHIRPS, less than 900 stations have been included. This month over 3,000 SSOD stations were blended into CHIRPS.
		+
		+	'''Auto/manual screening''' Some stations in India, Thailand, Japan, and Bangladesh that were auto-screened out of the initial blending were found to be reasonable, and included into CHIRPS Final data. These reports had initially been excluded in the "too big-too small" automated quality control screening for their high values compared to satellite estimates.
		+
		+	'''Rchecks plots''' CHIRPS (with stations) was considerably wetter than CHIRP (without stations) globally and in Asia, recording the largest difference between the two on record for the month of July.

	=== June 2026 ===		=== June 2026 ===

← Older revision		Revision as of 21:17, 24 August 2026
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	'''CHIRPS v2: Final versus Prelim''' This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/Difference_global_202607.png map] shows the difference between Prelim data and Final data, for July 2026 CHIRPS v2. This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/PercentDifference_global_202607.png map] shows the ratio of values.		'''CHIRPS v2: Final versus Prelim''' This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/Difference_global_202607.png map] shows the difference between Prelim data and Final data, for July 2026 CHIRPS v2. This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/PercentDifference_global_202607.png map] shows the ratio of values.

		+	'''Station data update''' In the previous months that the SSOD source has been blended into CHIRPS, less than 900 stations have been included. This month over 3,000 SSOD stations were blended into CHIRPS.

	=== June 2026 ===		=== June 2026 ===

@@ Line 24: / Line 24: @@
 ''
 ==R-Checks Monthly Highlights==
 === June 2026 ===

← Older revision		Revision as of 15:42, 15 July 2026
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	'''Ethiopia''' 3D-PAWS have started to be deployed in Ethiopia. There are two 3D-PAWS stations currently reporting. These stations have made it into CHIRPS Version 2 but a new epoch will need to be made before they are in CHIRPS Version 3.		'''Ethiopia''' 3D-PAWS have started to be deployed in Ethiopia. There are two 3D-PAWS stations currently reporting. These stations have made it into CHIRPS Version 2 but a new epoch will need to be made before they are in CHIRPS Version 3.
		+
		+	'''Columbia''' Interesting differences in CHIRP v2 and v3 in western Columbia. CHIRP v2 and v3 and CHIRPS3 agree on signal (anomaly pattern) but CHIRP2 is drier than the other three products. A similar result is also noted in St Vincent & the Grenadines.

	'''Rchecks plots'''		'''Rchecks plots'''

@@ Line 30: / Line 30: @@
 '''CHIRPS v2: Final versus Prelim''' This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/Difference_global_202606.png map] shows the difference between Prelim data and Final data, for June 2026 CHIRPS v2. This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/PercentDifference_global_202606.png map] shows the ratio of values.
-'''Ethiopia''' 3D-PAWS have started to be deployed in Ethiopia. There are two 3D-PAWS stations currently reporting. These stations have made it into Version 2 but a new epoch will need to be made before they are in Version 3.
+'''Ethiopia''' 3D-PAWS have started to be deployed in Ethiopia. There are two 3D-PAWS stations currently reporting. These stations have made it into CHIRPS Version 2 but a new epoch will need to be made before they are in CHIRPS Version 3.
 '''Rchecks plots'''

← Older revision		Revision as of 15:07, 15 July 2026
Line 29:		Line 29:

	'''CHIRPS v2: Final versus Prelim''' This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/Difference_global_202606.png map] shows the difference between Prelim data and Final data, for June 2026 CHIRPS v2. This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/PercentDifference_global_202606.png map] shows the ratio of values.		'''CHIRPS v2: Final versus Prelim''' This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/Difference_global_202606.png map] shows the difference between Prelim data and Final data, for June 2026 CHIRPS v2. This [https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/chirps_minus_prelim/v2/archive/PercentDifference_global_202606.png map] shows the ratio of values.
		+
		+	'''Ethiopia''' 3D-PAWS have started to be deployed in Ethiopia. There are two 3D-PAWS stations currently reporting. These stations have made it into Version 2 but a new epoch will need to be made before they are in Version 3.

	'''Rchecks plots'''		'''Rchecks plots'''

@@ Line 32: / Line 32: @@
 '''Rchecks plots'''
-Global: Another June with much higher CHIRPSv3 than CHIRP3. The global CHIRP3 mean appears to be the lowest June values estimated in the CHIRP3 global June 1981-present timeseries. Based on anomaly images in EWX, it seems like the low CHIRP3 value for June 2026 is largely driven by estimated large negative rainfall anomalies in India, southeast Asia, and Maritime Continent. Stations showed that in several influential locations these were underestimates (by CHIRP3), and the blending of these stations substantially increased values in CHIRPS3. ([https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/rchecks/monthly_compares/chirpsV3.Global.stats.2026.06.png Link])
+Global: Another June with much higher CHIRPS3 than CHIRP3. The global CHIRP3 mean appears to be the lowest June values estimated in the CHIRP3 global June 1981-present timeseries. Based on anomaly images in EWX, it seems like the low CHIRP3 value for June 2026 is largely driven by estimated large negative rainfall anomalies in India, southeast Asia, and Maritime Continent. Stations showed that in several influential locations these were underestimates (by CHIRP3), and the blending of these stations substantially increased values in CHIRPS3. ([https://data.chc.ucsb.edu/products/CHIRPS/v3.0/diagnostics/rchecks/monthly_compares/chirpsV3.Global.stats.2026.06.png Link])
 Asia: As noted in the global summary, June 2026 was one of the driest on record for Asia during the month of June according to CHIRP, but made considerably wetter by stations (CHIRPS). The corresponding difference between CHIRPS and CHIRP is the largest on record for the month of June.