Alert archive / Colorado / Flash Flood Watches in 2011
Flash Flood Watch 3, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood watch at Aug 2, 2011, 4:40 AM MDT for 14 counties in Colorado. It took effect at Aug 2, 2011, 12:00 PM MDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Aug 2, 2011, 4:40 AM MDT (10:40 UTC)
- In effect from
- Aug 2, 2011, 12:00 PM MDT
- Expired
- Aug 2, 2011, 8:44 PM MDT
- In force
- 9 hr
- Issued by
- NWS Grand Junction, CO
- Flood severity
- None
Counties Archuleta County, CO, Delta County, CO, Dolores County, CO, Eagle County, CO, Garfield County, CO, Gunnison County, CO, Hinsdale County, CO, La Plata County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Pitkin County, CO, San Juan County, CO, San Miguel County, CO
The radar
The Grand Junction radar (KGJX), 99 km from the middle of the area, began a volume at 10:43 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
Albuquerq/Krtlnd, NM (KABQ), launched 00:00Z, 10.7 hours before the alert went out and 371 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
- 12 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 2333 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Junction, CO wrote its last area forecast discussion before this flash flood watch went out at Aug 2, 4:20 AM MDT, 20 minutes earlier.
Area forecast discussion, Aug 2, 4:20 AM MDT, 20 minutes before
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</html>Hazardous weather outlook, Aug 1, 6:00 AM MDT, 22 hours 40 minutes before
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</html>The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 7:53 PM MDT | Areal Flood Advisory | GJT | Rio Blanco | 3 hr |
| Aug 2, 3:59 PM MDT | Areal Flood Advisory | GJT | Garfield | 93 min |
| Aug 2, 4:00 PM MDT | Areal Flood Advisory | GJT | San Miguel | 3 hr |
| Aug 2, 4:25 PM MDT | Flash Flood Warning | GJT | Gunnison, Montrose, Ouray | 3 hr |
| Aug 2, 4:49 PM MDT | Areal Flood Advisory | GJT | Garfield, Mesa | 72 min |
| Aug 1, 6:43 PM MDT | Areal Flood Advisory | GJT | Grand, San Juan | 82 min |
Nearby
Flash Flood Watches in Colorado, 2011Every flash flood watch in 2011
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.