Alert archive / Colorado / Flash Flood Warnings in 2015
Flash Flood Warning 8, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at May 23, 2015, 10:20 PM MDT for Logan County, Colorado. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 23, 2015, 10:20 PM MDT (04:20 UTC)
- Expired
- May 24, 2015, 3:45 AM MDT
- In force
- 5 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- Major
County Logan County, CO
The radar
The Cheyenne radar (KCYS), 146 km from the middle of the area, began a volume at 04:22 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.
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 4.3 hours before the alert went out and 90 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2134 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -24 m²/s²
- 0-3 km storm-relative helicity
- -22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
207 WGUS55 KBOU 240420 FFWBOU COC075-240945- /O.NEW.KBOU.FF.W.0008.150524T0420Z-150524T0945Z/ /00000.3.DM.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 1020 PM MDT SAT MAY 23 2015 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... A LEVEE FAILURE IN... SOUTHWESTERN LOGAN COUNTY IN NORTHEASTERN COLORADO... * UNTIL 345 AM MDT * AT 949 PM MDT...LOGAN COUNTY EMERGENCY MANAGEMENT REPORTED THAT WATER WAS OVERFLOWING SEVERAL DITCHES IN THE AREA JUST NORTH OF STERLING...INCLUDING THE AREA AROUND COUNTY ROADS 39 AND 41 AND COUNTY ROADS 34 AND 36. FLASH FLOODING WAS OCCURRING IN IMMEDIATELY SURROUNDING AREAS AND EVACUATIONS ARE IN PROGRESS. * LOCATIONS IMPACTED INCLUDE... NORTHERN STERLING. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE. && LAT...LON 4065 10317 4064 10324 4072 10324 4073 10314 $$ GIMMESTAD
2 follow-up statements
768 WGUS75 KBOU 240626 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1226 AM MDT SUN MAY 24 2015 COC075-240945- /O.CON.KBOU.FF.W.0008.000000T0000Z-150524T0945Z/ /00000.3.DM.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LOGAN CO- 1226 AM MDT SUN MAY 24 2015 ...A FLASH FLOOD WARNING FOR A LEVEE FAILURE REMAINS IN EFFECT UNTIL 345 AM MDT FOR SOUTHWESTERN LOGAN COUNTY... AT 1215 AM MDT LOGAN COUNTY EMERGENCY MANAGEMENT REPORTED THAT MANY COUNTY ROADS REMAIN CLOSED JUST NORTH OF STERLING. WATER WAS OVERFLOWING SEVERAL DITCHES IN THE AREA JUST NORTH OF STERLING...INCLUDING THE AREA AROUND COUNTY ROADS 39 AND 41 AND COUNTY ROADS 34 AND 36. OFFICIALS ARE STILL TRYING TO DETERMINE EXACTLY WHICH DITCHES HAVE CAUSED THE FLOODING. PRE-EVACUATION NOTIFICATIONS HAVE BEEN MADE TO RESIDENTS IN THE AREA OF COUNTY ROADS 36 TO 32 BETWEEN COUNTY ROADS 37 AND 43.5. LOCATIONS IMPACTED INCLUDE... NORTHERN STERLING. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. && LAT...LON 4065 10317 4064 10324 4072 10324 4073 10314 $$ ENTREKIN
128 WGUS75 KBOU 240816 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 216 AM MDT SUN MAY 24 2015 COC075-240823- /O.CAN.KBOU.FF.W.0008.000000T0000Z-150524T0945Z/ /00000.3.DM.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LOGAN CO- 216 AM MDT SUN MAY 24 2015 ...THE FLASH FLOOD WARNING FOR A LEVEE FAILURE HAS BEEN CANCELLED FOR SOUTHWESTERN LOGAN COUNTY... A NEW AREAL FLOOD WARNING HAS NOW REPLACED THIS FLASH FLOOD WARNING ACROSS SOUTHWESTERN LOGAN COUNTY. FLOODING CONTINUES ACROSS PORTIONS OF NORTH STERLING AT THIS TIME. LAT...LON 4065 10317 4064 10324 4072 10324 4073 10314 $$ ENTREKIN
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 6:27 PM MDT | River Flood Warning | BOU | Logan, Morgan, Washington | 72 hr |
| May 23, 8:18 PM MDT | Areal Flood Advisory | BOU | Logan | 3 hr |
| May 24, 2:10 AM MDT | Areal Flood Warning | BOU | Logan | 18 hr |
| May 24, 4:44 AM MDT | Flash Flood Watch | BOU | Adams, Arapahoe, Elbert, Lincoln, Logan, Morgan and 4 more | 14 hr |
| May 24, 11:22 AM MDT | Areal Flood Advisory | BOU | Elbert | 3 hr |
| May 24, 11:57 AM MDT | Flash Flood Warning | BOU | Arapahoe, Elbert | 3 hr |
| May 24, 12:08 PM MDT | Special Weather Statement | BOU | Arapahoe | 37 min |
| May 24, 12:15 PM MDT | Tornado Warning | BOU | Arapahoe, Elbert | 15 min |
| May 24, 12:33 PM MDT | Tornado Warning | BOU | Arapahoe, Elbert | 27 min |
| May 24, 1:00 PM MDT | Tornado Warning | BOU | Arapahoe | 18 min |
| May 24, 1:23 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe | 3 hr |
| May 24, 1:25 PM MDT | Special Weather Statement | BOU | Adams | 35 min |
| May 24, 2:17 PM MDT | Special Weather Statement | BOU | Washington | 28 min |
| May 24, 2:43 PM MDT | Areal Flood Advisory | BOU | Adams, Morgan, Washington | 3 hr |
| May 24, 3:15 PM MDT | Special Weather Statement | BOU | Washington | 30 min |
Nearby
Flash Flood Warnings in Colorado, 2015Every flash flood warning in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.