Alert archive / Colorado / Flash Flood Warnings in 2014
Flash Flood Warning 21, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Sep 21, 2014, 4:05 AM MDT for Archuleta County, La Plata County, Colorado. It was in force for 4 hr. 8 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 21, 2014, 4:05 AM MDT (10:05 UTC)
- Expired
- Sep 21, 2014, 8:00 AM MDT
- In force
- 4 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Archuleta County, CO, La Plata County, CO
The radar
The Grand Junction radar (KGJX), 210 km from the middle of the area, began a volume at 10:08 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 21, 4:28 AM MDT | HEAVY RAIN 1.57 | 1 Sw Durango, CO | RAINFALL TOTAL SINCE 1 AM. |
| Sep 21, 5:00 AM MDT | HEAVY RAIN 1.52 | 2 Sw Durango, CO | |
| Sep 21, 5:00 AM MDT | HEAVY RAIN 2.13 | 1 Ssw Durango, CO | |
| Sep 21, 5:00 AM MDT | HEAVY RAIN 2.26 | 1 Nne Durango, CO | |
| Sep 21, 6:00 AM MDT | HEAVY RAIN 1.41 | 2 Wsw Oxford, CO | CORRECTED FOR RAINFALL AMOUNT....RAINFALL OVER THE LAST 6 HOURS SINCE MIDNIGHT AT THE DURANGO LA PLATA COUNTY AIRPORT. |
| Sep 21, 6:00 AM MDT | HEAVY RAIN 1.42 | 2 Wsw Oxford, CO | RAINFALL OVER THE LAST 6 HOURS SINCE MIDNIGHT AT THE DURANGO LA PLATA COUNTY AIRPORT. |
| Sep 21, 6:00 AM MDT | HEAVY RAIN 1.71 | 5 Sw Trimble, CO | RAINFALL OVER THE LAST 6 HOURS SINCE MIDNIGHT |
| Sep 21, 6:00 AM MDT | HEAVY RAIN 1.73 | 1 Sw Durango, CO | RAINFALL OVER THE LAST 6 HOURS SINCE MIDNIGHT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 00:00Z, 10.1 hours before the alert went out and 224 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
- 67 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 3357 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
925
WGUS55 KGJT 211005
FFWGJT
COC007-067-211400-
/O.NEW.KGJT.FF.W.0021.140921T1005Z-140921T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
405 AM MDT SUN SEP 21 2014
THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHEASTERN LA PLATA COUNTY IN SOUTHWEST COLORADO...
SOUTHWESTERN ARCHULETA COUNTY IN SOUTHWEST COLORADO...
* UNTIL 800 AM MDT
* AT 403 AM MDT...LOCAL LAW ENFORCEMENT REPORTED FLASH FLOODING IN
DURANGO AND NORTH OF TOWN ALONG HIGHWAY 550 DUE TO HEAVY RAIN WITH
EMBEDDED THUNDERSTORMS. UP TO ONE INCH OF RAIN HAS ALREADY FALLEN
AT THE DURANGO LA PLATA COUNTY AIRPORT WITH SIMILAR AMOUNTS
ESTIMATED IN THE VICINITY. FLASH FLOODING IS ALREADY OCCURRING.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
DURANGO...BAYFIELD...IGNACIO...OXFORD...
VALLECITO...TRIMBLE...HERMOSA AND FALFA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
&&
LAT...LON 3718 10793 3746 10796 3742 10754 3700 10745
3700 10769
$$
MDA2 follow-up statements
609
WGUS75 KGJT 211153
FFSGJT
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
553 AM MDT SUN SEP 21 2014
COC007-067-211400-
/O.CON.KGJT.FF.W.0021.000000T0000Z-140921T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PLATA CO-ARCHULETA CO-
553 AM MDT SUN SEP 21 2014
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 AM MDT FOR
SOUTHEASTERN LA PLATA AND SOUTHWESTERN ARCHULETA COUNTIES...
AT 550 AM MDT...LOCAL LAW ENFORCEMENT REPORTED FLASH FLOODING IN
DURANGO AND NORTH OF TOWN ALONG HIGHWAY 550 DUE TO HEAVY RAIN WITH
EMBEDDED THUNDERSTORMS. OBSERVATIONS INDICATE 1.5 TO 2 INCHES OF
RAIN HAS ALREADY FALLEN WITHIN THE LAST 6 HOURS. WHILE THE HEAVIEST
RAIN HAS ENDED...FLOODING IS STILL POSSIBLE OR MAY STILL BE
OCCURRING. MORE HEAVY RAIN IS EXPECTED THIS AFTERNOON.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
DURANGO...BAYFIELD...IGNACIO...OXFORD...
VALLECITO...TRIMBLE...HERMOSA AND FALFA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
&&
LAT...LON 3718 10793 3746 10796 3742 10754 3700 10745
3700 10769
$$
MDA911
WGUS75 KGJT 211358
FFSGJT
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
758 AM MDT SUN SEP 21 2014
COC007-067-211407-
/O.EXP.KGJT.FF.W.0021.000000T0000Z-140921T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PLATA CO-ARCHULETA CO-
758 AM MDT SUN SEP 21 2014
...THE FLASH FLOOD WARNING FOR SOUTHEASTERN LA PLATA AND SOUTHWESTERN
ARCHULETA COUNTIES WILL EXPIRE AT 800 AM MDT...
THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.
LAT...LON 3718 10793 3746 10796 3742 10754 3700 10745
3700 10769
$$
EHThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 3:53 AM MDT | Areal Flood Advisory | GJT | Dolores, Ouray, San Miguel | 3 hr |
| Sep 21, 10:24 AM MDT | Flash Flood Watch | GJT | Archuleta, Dolores, Hinsdale, La Plata, Montezuma, San Juan and 1 more | 23 hr |
Nearby
Flash Flood Warnings in Colorado, 2014Every flash flood warning in 2014
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.