Alert archive / Colorado / Areal Flood Advisories in 2021

Areal Flood Advisory 155, NWS Denver/Boulder, CO

July 31, 2021Boulder County, Colorado

NWS Denver/Boulder, CO issued this areal flood advisory at Jul 31, 2021, 3:29 PM MDT for Boulder County, Colorado. It was in force for 91 min.

The area

The counties it named.

The facts

Issued: Jul 31, 2021, 3:29 PM MDT (21:29 UTC)
Expired: Jul 31, 2021, 5:00 PM MDT
In force: 91 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon

County Boulder County, CO

The radar

The Denver radar (KFTG), 77 km from the middle of the area, began a volume at 21:30 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this areal flood advisory went out at Jul 31, 3:11 PM MDT, 18 minutes earlier.

Area forecast discussion, Jul 31, 3:11 PM MDT, 18 minutes before

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Hazardous weather outlook, Jul 31, 10:33 AM MDT, 4 hours 56 minutes before

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In the hours before

Local storm report, Jul 31, 9:40 AM MDT, 5 hours 49 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
940 AM MDT SAT JUL 31 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0700 AM     HEAVY RAIN       1 NNE LAFAYETTE         40.01N 105.09W
07/31/2021  M3.69 INCH       BOULDER            CO   CO-OP OBSERVER

            CO-OP OBSERVER STATION LAFC2 1.3 NE
            LAFAYETTE.

0700 AM     HEAVY RAIN       3 S ERIE                39.99N 105.05W
07/31/2021  M3.56 INCH       BROOMFIELD         CO   COCORAHS

            COCORAHS STATION CO-BR-32 BROOMFIELD 3.2
            NNE.

0800 AM     HEAVY RAIN       3 NE DILLON             39.66N 106.00W
07/31/2021  M3.08 INCH       SUMMIT             CO   MESONET

            24 HOUR TOTAL. 1.39 INCHES FELL IN 30
            MINUTES BETWEEN 2:22 AND 2:52 PM ON JULY
            30TH.

0700 AM     HEAVY RAIN       1 SE ERIE               40.02N 105.04W
07/31/2021  M2.95 INCH       WELD               CO   COCORAHS

            COCORAHS STATION CO-WE-392 ERIE 0.5 SE.

0848 AM     HEAVY RAIN       3 S ERIE                39.99N 105.05W
07/31/2021  M2.89 INCH       BROOMFIELD         CO   MESONET

            MESONET STATION EW1146 BROOMFIELD.

0700 AM     HEAVY RAIN       1 NE LAFAYETTE          40.00N 105.09W
07/31/2021  M2.62 INCH       BOULDER            CO   COCORAHS

            COCORAHS STATION CO-BO-367 LAFAYETTE 0.9 NE.

0700 AM     HEAVY RAIN       3 SSE ERIE              39.99N 105.02W
07/31/2021  M2.60 INCH       BROOMFIELD         CO   COCORAHS

            COCORAHS STATION CO-BR-53 BROOMFIELD 3.9
            NNE.

0800 AM     HEAVY RAIN       10 NNE SILVERTHORNE     39.80N 106.03W
07/31/2021  M2.40 INCH       GRAND              CO   MESONET

            MIDDLE FORK CAMP SNOTEL - MFKC2.

0800 AM     HEAVY RAIN       2 N LOVELAND PASS       39.69N 105.88W
07/31/2021  M2.39 INCH       CLEAR CREEK        CO   MESONET

            24 HOUR TOTAL. MESONET STATION CO125 070E217
            US 6 LOVELAND PASS.

0700 AM     HEAVY RAIN       3 NNE ERIE              40.07N 105.03W
07/31/2021  M2.35 INCH       WELD               CO   COCORAHS

            COCORAHS STATION CO-WE-209 ERIE 1.6 NE.

0800 AM     HEAVY RAIN       1 SSE WELLINGTON        40.70N 105.00W
07/31/2021  M2.29 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1146 WELLINGTON 0.6
            SSE.

0700 AM     HEAVY RAIN       FREDERICK               40.11N 104.93W
07/31/2021  M2.23 INCH       WELD               CO   COCORAHS

            COCORAHS STATION CO-WE-371 FREDERICK 0.5
            ENE.

0800 AM     HEAVY RAIN       5 WSW GUANELLA PASS     39.57N 105.80W
07/31/2021  M2.20 INCH       CLEAR CREEK        CO   MESONET

            JACKWHACKER GULCH SNOTEL - JWGC2.

0700 AM     HEAVY RAIN       1 NNE PINE JUNCTION     39.47N 105.39W
07/31/2021  M2.07 INCH       JEFFERSON          CO   COCORAHS

            COCORAHS STATION CO-JF-222 CONIFER 5.7 SW.

0742 PM     HEAVY RAIN       2 S ERIE                40.00N 105.05W
07/30/2021  M2.05 INCH       BROOMFIELD         CO   PUBLIC

0700 AM     HEAVY RAIN       1 N ERIE                40.05N 105.05W
07/31/2021  M2.05 INCH       WELD               CO   COCORAHS

            COCORAHS STATION CO-WE-538 ERIE 1.3 N.

0845 AM     HEAVY RAIN       2 NW FREDERICK          40.12N 104.97W
07/31/2021  M2.02 INCH       WELD               CO   MESONET

            MESONET STATION EW7704 FREDERICK.

0800 AM     HEAVY RAIN       DRAKE                   40.43N 105.35W
07/31/2021  M1.95 INCH       LARIMER            CO   MESONET

            MESONET STATION DKKC2 0.9 W DRAKE.

0845 AM     HEAVY RAIN       4 NE WELLINGTON         40.75N 104.96W
07/31/2021  M1.88 INCH       LARIMER            CO   MESONET

            MESONET STATION ICRC2 3.8 NE WELLINGTON.

0846 AM     HEAVY RAIN       3 NNE ERIE              40.07N 105.03W
07/31/2021  M1.82 INCH       WELD               CO   MESONET

            MESONET STATION CW9307 ERIE.

0841 AM     HEAVY RAIN       3 ESE MEAD              40.21N 104.94W
07/31/2021  M1.81 INCH       WELD               CO   MESONET

            MESONET STATION CW6531 MEAD.

0846 AM     HEAVY RAIN       3 NNW LARKSPUR          39.25N 104.92W
07/31/2021  M1.80 INCH       DOUGLAS            CO   MESONET

            MESONET STATION FW6622 LARKSPUR.

0700 AM     HEAVY RAIN       WELLINGTON              40.71N 105.01W
07/31/2021  M1.75 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-952 WELLINGTON 0.4
            NW.

0715 AM     HEAVY RAIN       7 E VIRGINIA DALE       40.97N 105.22W
07/31/2021  M1.73 INCH       LARIMER            CO   CO-OP OBSERVER

            CO-OP OBSERVER STATION VDAC2 6.9 E VIRGINIA
            DALE.

0800 AM     HEAVY RAIN       3 N DRAKE               40.47N 105.34W
07/31/2021  M1.72 INCH       LARIMER            CO   MESONET

            MESONET STATION MTNC2 2.8 N DRAKE.

0847 AM     HEAVY RAIN       2 W ERIE                40.03N 105.08W
07/31/2021  M1.71 INCH       BOULDER            CO   MESONET

            MESONET STATION EW2013 ERIE.

0700 AM     HEAVY RAIN       2 WNW ERIE              40.04N 105.07W
07/31/2021  M1.71 INCH       BOULDER            CO   COCORAHS

            COCORAHS STATION CO-BO-285 ERIE 1.7 WNW.

0847 AM     HEAVY RAIN       1 NE DACONO             40.09N 104.93W
07/31/2021  M1.69 INCH       WELD               CO   MESONET

            MESONET STATION CW6087 DACONO.

0756 AM     HEAVY RAIN       4 NW KERSEY             40.42N 104.62W
07/31/2021  M1.62 INCH       WELD               CO   AWOS

            AWOS STATION KGXY GREELEY WELD.

0700 AM     HEAVY RAIN       4 NE FIRESTONE          40.17N 104.89W
07/31/2021  M1.61 INCH       WELD               CO   COCORAHS

            COCORAHS STATION CO-WE-326 FORT LUPTON 7.4
            NW.

0700 AM     HEAVY RAIN       2 NNW DAILEY            40.68N 102.74W
07/31/2021  M1.57 INCH       LOGAN              CO   COCORAHS

            COCORAHS STATION CO-LG-68 FLEMING 5.2 E.

0700 AM     HEAVY RAIN       2 NNW LARKSPUR          39.25N 104.91W
07/31/2021  M1.57 INCH       DOUGLAS            CO   COCORAHS

            COCORAHS STATION CO-DG-315 PERRY PARK 3.7
            ESE.

0805 AM     HEAVY RAIN       4 NE WAVERLY            40.77N 105.02W
07/31/2021  M1.55 INCH       LARIMER            CO   MESONET

            MESONET STATION CMDC2 4.5 N WELLINGTON.

0700 AM     HEAVY RAIN       3 N DRAKE               40.47N 105.34W
07/31/2021  M1.53 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1257 DRAKE 3.2 NNW.

0846 AM     HEAVY RAIN       4 SSE ERIE              39.98N 105.02W
07/31/2021  M1.53 INCH       BROOMFIELD         CO   MESONET

            MESONET STATION FW5643 BROOMFIELD.

0700 AM     HEAVY RAIN       2 WNW ERIE              40.04N 105.08W
07/31/2021  M1.51 INCH       BOULDER            CO   COCORAHS

            COCORAHS STATION CO-BO-271 ERIE 1.9 WNW.

0850 AM     HEAVY RAIN       3 W WESTMINSTER         39.88N 105.10W
07/31/2021  M1.45 INCH       JEFFERSON          CO   MESONET

            MESONET STATION FW8770 WESTMINSTER.

0700 AM     HEAVY RAIN       2 SW ESTES PARK         40.36N 105.55W
07/31/2021  M1.44 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1272 ESTES PARK 1.7
            SW.

0846 AM     HEAVY RAIN       3 WSW LOVELAND          40.39N 105.13W
07/31/2021  M1.40 INCH       LARIMER            CO   MESONET

            MESONET STATION FW8707 LOVELAND.

0849 AM     HEAVY RAIN       FIRESTONE               40.12N 104.94W
07/31/2021  M1.40 INCH       WELD               CO   MESONET

            MESONET STATION AR797 FIRESTONE.

0700 AM     HEAVY RAIN       4 NW CAMPION            40.38N 105.14W
07/31/2021  M1.38 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-495 LOVELAND 4.3 SW.

0721 AM     HEAVY RAIN       3 NE DENVER             39.77N 104.94W
07/31/2021  M1.37 INCH       DENVER             CO   COCORAHS

            COCORAHS STATION CO-DN-295 DENVER 2.7 NNE.

0300 AM     HEAVY RAIN       2 WSW NATURAL FORT      40.94N 104.95W
07/31/2021  M1.36 INCH       LARIMER            CO   MESONET

            MESONET STATION MSRC2 1.6 SW NATURAL FORT.

0700 AM     HEAVY RAIN       3 NNW CAMPION           40.38N 105.12W
07/31/2021  M1.34 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1252 LOVELAND 3.8 SW.

0700 AM     HEAVY RAIN       1 SW WELLINGTON         40.70N 105.01W
07/31/2021  M1.33 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1008 WELLINGTON 0.8
            SW.

0847 AM     HEAVY RAIN       3 SSW ESTES PARK        40.33N 105.55W
07/31/2021  M1.33 INCH       LARIMER            CO   MESONET

            MESONET STATION EW2911 ESTES PARK.

0700 AM     HEAVY RAIN       1 NNE GLEN HAVEN        40.47N 105.44W
07/31/2021  M1.31 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1268 GLEN HAVEN 1.8
            NNW.

0700 AM     HEAVY RAIN       3 SW FORT COLLINS       40.53N 105.10W
07/31/2021  M1.31 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1202 FORT COLLINS 2.6
            SW.

0800 AM     HEAVY RAIN       9 SE WESTON PASS        39.03N 106.08W
07/31/2021  M1.30 INCH       PARK               CO   MESONET

            ROUGH AND TUMBLE SNOTEL - ROUC2.

0835 AM     HEAVY RAIN       2 SE HOLYOKE            40.57N 102.28W
07/31/2021  M1.30 INCH       PHILLIPS           CO   AWOS

            AWOS STATION KHEQ HOLYOKE AIRPORT.

0835 AM     HEAVY RAIN       2 NNW GLEN HAVEN        40.48N 105.47W
07/31/2021  M1.29 INCH       LARIMER            CO   MESONET

            MESONET STATION TT370 PRAWS 4.

0847 AM     HEAVY RAIN       1 N GLEN HAVEN          40.47N 105.45W
07/31/2021  M1.26 INCH       LARIMER            CO   MESONET

            MESONET STATION EW4490 GLEN HAVEN.

0700 AM     HEAVY RAIN       3 NNE BROOMFIELD        39.95N 105.05W
07/31/2021  M1.25 INCH       BROOMFIELD         CO   COCORAHS

            COCORAHS STATION CO-BR-52 BROOMFIELD 1.0 NE.

0700 AM     HEAVY RAIN       4 SSW MEAD              40.17N 105.02W
07/31/2021  M1.25 INCH       WELD               CO   COCORAHS

            COCORAHS STATION CO-WE-302 LONGMONT 5.1 E.

0710 AM     HEAVY RAIN       2 WSW GOLDEN            39.72N 105.25W
07/31/2021  M1.22 INCH       JEFFERSON          CO   MESONET

            MESONET STATION LOOC2 LOOKOUT MOUNTAIN.

0845 AM     HEAVY RAIN       PINE GROVE              39.42N 105.34W
07/31/2021  M1.22 INCH       JEFFERSON          CO   MESONET

            MESONET STATION FW7164 PINE.

0700 AM     HEAVY RAIN       2 SW GOLDEN             39.72N 105.24W
07/31/2021  M1.18 INCH       JEFFERSON          CO   COCORAHS

            COCORAHS STATION CO-JF-497 GOLDEN 1.6 SW.

0700 AM     HEAVY RAIN       2 N NORTHGLENN          39.94N 104.98W
07/31/2021  M1.18 INCH       ADAMS              CO   COCORAHS

            COCORAHS STATION CO-AD-234 THORNTON 3.4 NNW.

0845 AM     HEAVY RAIN       2 NW ERIE               40.05N 105.08W
07/31/2021  M1.17 INCH       BOULDER            CO   MESONET

            MESONET STATION DW9721 ERIE.

0700 AM     HEAVY RAIN       3 SW FORT COLLINS       40.52N 105.10W
07/31/2021  M1.16 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1118 FORT COLLINS 3.1
            SW.

0700 AM     HEAVY RAIN       1 S CROOK               40.85N 102.80W
07/31/2021  M1.15 INCH       LOGAN              CO   CO-OP OBSERVER

            CO-OP OBSERVER STATION CRKC2 0.6 S CROOK.

0700 AM     HEAVY RAIN       DILLON                  39.63N 106.04W
07/31/2021  M1.13 INCH       SUMMIT             CO   MESONET

            MESONET STATION DLLC2 DILLON.

0845 AM     HEAVY RAIN       1 W SILVERTHORNE        39.65N 106.10W
07/31/2021  M1.11 INCH       SUMMIT             CO   MESONET

            MESONET STATION 1151D SILVERTHORNE.

0800 AM     HEAVY RAIN       2 WSW BLACK HOLLOW RESE 40.59N 104.91W
07/31/2021  M1.11 INCH       WELD               CO   COCORAHS

            COCORAHS STATION CO-WE-528 FORT COLLINS 8.7
            ENE.

0700 AM     HEAVY RAIN       4 ESE HORSETOOTH MOUNTA 40.52N 105.13W
07/31/2021  M1.10 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1204 FORT COLLINS 3.8
            SW.

0710 AM     HEAVY RAIN       2 SSW WESTMINSTER       39.85N 105.07W
07/31/2021  M1.10 INCH       JEFFERSON          CO   COCORAHS

            COCORAHS STATION CO-JF-474 ARVADA 2.7 NE.

0846 AM     HEAVY RAIN       10 E ARAPAHOE PARK      39.61N 104.51W
07/31/2021  M1.10 INCH       ARAPAHOE           CO   MESONET

            MESONET STATION AV686 BENNETT.

0850 AM     HEAVY RAIN       3 NW CAMPION            40.38N 105.15W
07/31/2021  M1.10 INCH       LARIMER            CO   MESONET

            MESONET STATION AR167 BERTHOUD.

0700 AM     HEAVY RAIN       3 S ESTES PARK          40.33N 105.52W
07/31/2021  M1.09 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-247 ESTES PARK 3.3
            SSW.

0850 AM     HEAVY RAIN       2 NE KEN CARYL          39.60N 105.12W
07/31/2021  M1.08 INCH       JEFFERSON          CO   MESONET

            MESONET STATION FW3820 LITTLETON.

0700 AM     HEAVY RAIN       4 NW HARDIN             40.39N 104.47W
07/31/2021  M1.06 INCH       WELD               CO   COCORAHS

            COCORAHS STATION CO-WE-340 KERSEY 4.5 E.

0847 AM     HEAVY RAIN       2 SSE ESTES PARK        40.34N 105.51W
07/31/2021  M1.04 INCH       LARIMER            CO   MESONET

            MESONET STATION EW3265 ESTES PARK.

0846 AM     HEAVY RAIN       4 ENE DENVER            39.76N 104.92W
07/31/2021  M1.04 INCH       DENVER             CO   MESONET

            MESONET STATION EW1637 DENVER.

0845 AM     HEAVY RAIN       3 SW FORT COLLINS       40.52N 105.12W
07/31/2021  M1.04 INCH       LARIMER            CO   MESONET

            MESONET STATION TFTC2 3.4 SW FORT COLLINS.

0400 AM     HEAVY RAIN       1 WSW KERSEY            40.38N 104.58W
07/31/2021  M1.03 INCH       WELD               CO   COCORAHS

            COCORAHS STATION CO-WE-447 KERSEY 1.3 WSW.

0700 AM     HEAVY RAIN       2 W ESTES PARK          40.37N 105.55W
07/31/2021  M1.01 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1115 ESTES PARK 1.7
            W.

0730 AM     HEAVY RAIN       1 ESE DENVER            39.73N 104.96W
07/31/2021  M1.01 INCH       DENVER             CO   COCORAHS

            COCORAHS STATION CO-DN-112 DENVER 0.2 NNW
            (BOTANIC GARDENS).

0755 AM     HEAVY RAIN       3 W HORSETOOTH MOUNTAIN 40.54N 105.25W
07/31/2021  M1.01 INCH       LARIMER            CO   MESONET

            MESONET STATION MHPC2 2.8 W HORSETOOTH
            MOUNTAIN.

0800 AM     HEAVY RAIN       2 SW FORT COLLINS       40.53N 105.10W
07/31/2021  M1.00 INCH       LARIMER            CO   COCORAHS

            COCORAHS STATION CO-LR-1179 FORT COLLINS 2.3
            SW.

&&

Local storm report, Jul 31, 9:42 AM MDT, 5 hours 47 minutes before

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The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 6:01 PM MDT	Areal Flood Advisory	BOU	Boulder, Broomfield, Weld	59 min
Jul 30, 6:08 PM MDT	Areal Flood Advisory	BOU	Adams, Denver	82 min
Jul 30, 6:48 PM MDT	Areal Flood Advisory	BOU	Douglas, Elbert	117 min
Jul 30, 7:13 PM MDT	Areal Flood Warning	BOU	Larimer	3 hr
Jul 30, 7:35 PM MDT	Areal Flood Advisory	BOU	Boulder	70 min
Jul 30, 7:52 PM MDT	Areal Flood Advisory	BOU	Boulder, Broomfield, Weld	83 min
Jul 30, 7:53 PM MDT	Areal Flood Advisory	BOU	Larimer	68 min
Jul 30, 8:19 PM MDT	Areal Flood Advisory	BOU	Douglas, Jefferson	42 min
Jul 30, 9:34 PM MDT	Areal Flood Advisory	BOU	Adams, Boulder, Broomfield, Denver, Jefferson, Weld	56 min
Jul 30, 9:35 PM MDT	Areal Flood Advisory	BOU	Clear Creek, Gilpin	3 hr
Jul 30, 10:18 PM MDT	Flash Flood Warning	BOU	Boulder, Broomfield, Weld	3 hr
Jul 30, 11:17 PM MDT	Special Weather Statement	BOU	Weld	28 min
Jul 30, 11:24 PM MDT	Areal Flood Advisory	BOU	Weld	81 min
Jul 30, 11:40 PM MDT	Areal Flood Advisory	BOU	Weld	60 min
Jul 31, 1:12 AM MDT	Special Weather Statement	BOU	Logan	33 min
Jul 31, 2:39 AM MDT	Special Weather Statement	BOU	Logan	51 min
Jul 31, 3:20 AM MDT	Special Weather Statement	BOU	Phillips, Sedgwick	40 min
Jul 31, 3:59 AM MDT	Areal Flood Advisory	BOU	Logan, Phillips, Sedgwick	74 min
Jul 31, 11:49 AM MDT	Flash Flood Warning	BOU	Larimer	2 hr
Jul 31, 12:27 PM MDT	Flash Flood Warning	BOU	Grand	3 hr
Jul 31, 12:29 PM MDT	Areal Flood Advisory	BOU	Grand	91 min
Jul 31, 12:32 PM MDT	Areal Flood Advisory	BOU	Grand	88 min
Jul 31, 12:34 PM MDT	Areal Flood Advisory	BOU	Grand	86 min
Jul 31, 12:39 PM MDT	Areal Flood Advisory	BOU	Park	81 min
Jul 31, 12:42 PM MDT	Areal Flood Advisory	BOU	Park	93 min
Jul 31, 1:05 PM MDT	Areal Flood Advisory	BOU	Larimer	85 min
Jul 31, 1:33 PM MDT	Areal Flood Advisory	BOU	Grand	87 min
Jul 31, 2:16 PM MDT	Flash Flood Warning	BOU	Larimer	89 min
Jul 31, 2:43 PM MDT	Flash Flood Warning	BOU	Larimer	92 min
Jul 31, 2:57 PM MDT	Areal Flood Advisory	BOU	Park	93 min
Jul 31, 3:24 PM MDT	Flash Flood Warning Considerable damage threat	BOU	Larimer	81 min
Jul 31, 3:33 PM MDT	Flash Flood Warning	BOU	Park	3 hr
Jul 31, 3:37 PM MDT	Flash Flood Warning	BOU	Boulder	3 hr
Jul 31, 3:51 PM MDT	Areal Flood Advisory	BOU	Boulder	84 min
Jul 31, 4:31 PM MDT	Areal Flood Advisory	BOU	Park	89 min
Jul 31, 4:42 PM MDT	Areal Flood Advisory	BOU	Park	93 min
Jul 31, 4:52 PM MDT	Areal Flood Advisory	BOU	Park	83 min

Nearby

Areal Flood Advisories in Colorado, 2021 Every areal flood advisory in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.