Alert archive / Utah / Flash Flood Watches in 2021
Flash Flood Watch 9, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood watch at Jul 29, 2021, 2:38 AM MDT for 7 counties in Utah. It took effect at Jul 29, 2021, 3:00 PM MDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Jul 29, 2021, 2:38 AM MDT (08:38 UTC)
- In effect from
- Jul 29, 2021, 3:00 PM MDT
- Expired
- Jul 29, 2021, 11:53 PM MDT
- In force
- 9 hr
- Issued by
- NWS Salt Lake City, UT
- Flood severity
- None
Counties Emery County, UT, Garfield County, UT, Kane County, UT, San Juan County, UT, Sevier County, UT, Washington County, UT, Wayne County, UT
The radar
The Cedar City radar (KICX), 134 km from the middle of the area, began a volume at 08:42 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
Grand Junction, CO (KGJT), launched 00:00Z, 8.6 hours before the alert went out and 284 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
- 405 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 3067 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
419 WGUS65 KSLC 290838 FFASLC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Salt Lake City UT 238 AM MDT Thu Jul 29 2021 UTZ128>131-292315- /O.NEW.KSLC.FF.A.0009.210729T2100Z-210730T0900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ South Central Utah-Capitol Reef National Park and Vicinity-Western Canyonlands-Glen Canyon Recreation Area/Lake Powell- Including the cities of Loa, Kanab, Bullfrog, Torrey, Escalante, Big Water, and Hanksville 238 AM MDT Thu Jul 29 2021 ...FLASH FLOOD WATCH IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... The National Weather Service in Salt Lake City has issued a * Flash Flood Watch for a portion of Utah, including the following areas, Capitol Reef National Park and Vicinity, Glen Canyon Recreation Area/Lake Powell, South Central Utah and Western Canyonlands. * From this afternoon through late tonight. * Thunderstorms capable of producing heavy rainfall will develop late this afternoon and continue into late tonight. The storms are expected to move from southeast to northwest. * Heavy rainfall may result in flash flooding, especially in dry washes, slot canyons, and small streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ MS
3 follow-up statements
356 WGUS65 KSLC 292107 FFASLC Flood Watch National Weather Service Salt Lake City UT 307 PM MDT Thu Jul 29 2021 UTZ128>131-300515- /O.CON.KSLC.FF.A.0009.000000T0000Z-210730T0900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ South Central Utah-Capitol Reef National Park and Vicinity-Western Canyonlands-Glen Canyon Recreation Area/Lake Powell- Including the cities of Loa, Kanab, Bullfrog, Torrey, Escalante, Big Water, and Hanksville 307 PM MDT Thu Jul 29 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 3 AM MDT FRIDAY... The Flash Flood Watch continues for * A portion of Utah, including the following areas, Capitol Reef National Park and Vicinity, Glen Canyon Recreation Area/Lake Powell, South Central Utah and Western Canyonlands. * Until 3 AM MDT Friday. * Thunderstorms capable of producing heavy rainfall will develop late this afternoon and continue into late tonight. The storms are expected to move from southeast to northwest. * Heavy rainfall may result in flash flooding, especially in dry washes, slot canyons, and small streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ GM
978 WGUS65 KSLC 300346 FFASLC Flood Watch National Weather Service Salt Lake City UT 946 PM MDT Thu Jul 29 2021 UTZ128>131-300900- /O.CON.KSLC.FF.A.0009.000000T0000Z-210730T0900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ South Central Utah-Capitol Reef National Park and Vicinity-Western Canyonlands-Glen Canyon Recreation Area/Lake Powell- Including the cities of Loa, Kanab, Bullfrog, Torrey, Escalante, Big Water, and Hanksville 946 PM MDT Thu Jul 29 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 3 AM MDT FRIDAY... The Flash Flood Watch continues for * A portion of Utah, including the following areas, Capitol Reef National Park and Vicinity, Glen Canyon Recreation Area/Lake Powell, South Central Utah and Western Canyonlands. * Until 3 AM MDT Friday. * Thunderstorms capable of producing heavy rainfall will continue until late tonight. The storms are expected to move from southeast to northwest. * Heavy rainfall may result in flash flooding, especially in dry washes, slot canyons, and small streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ WFO SLC
844 WGUS65 KSLC 300553 FFASLC Flood Watch National Weather Service Salt Lake City UT 1153 PM MDT Thu Jul 29 2021 UTZ128>131-300700- /O.CAN.KSLC.FF.A.0009.000000T0000Z-210730T0900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ South Central Utah-Capitol Reef National Park and Vicinity-Western Canyonlands-Glen Canyon Recreation Area/Lake Powell- Including the cities of Loa, Kanab, Bullfrog, Torrey, Escalante, Big Water, and Hanksville 1153 PM MDT Thu Jul 29 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch has been cancelled for a portion of Utah, including the following areas, Capitol Reef National Park and Vicinity, Glen Canyon Recreation Area/Lake Powell, South Central Utah and Western Canyonlands. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ Church
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 7:56 PM MDT | Special Weather Statement | SLC | Tooele | 49 min |
| Jul 28, 9:52 PM MDT | Special Weather Statement | SLC | Davis | 83 min |
| Jul 29, 1:40 PM MDT | Special Weather Statement | SLC | Iron | 20 min |
| Jul 29, 2:00 PM MDT | Severe Thunderstorm Warning | SLC | Iron, Washington | 30 min |
| Jul 29, 2:17 PM MDT | Special Weather Statement | SLC | Piute | 28 min |
| Jul 29, 2:26 PM MDT | Special Weather Statement | SLC | Beaver | 34 min |
| Jul 29, 2:39 PM MDT | Severe Thunderstorm Warning | SLC | Beaver, Iron | 36 min |
| Jul 29, 2:50 PM MDT | Areal Flood Advisory | SLC | Beaver | 115 min |
| Jul 29, 3:13 PM MDT | Special Weather Statement | SLC | Beaver | 32 min |
| Jul 29, 3:33 PM MDT | Special Weather Statement | SLC | Iron | 27 min |
| Jul 29, 3:54 PM MDT | Special Weather Statement | SLC | Millard | 36 min |
| Jul 29, 4:11 PM MDT | Special Weather Statement | SLC | 34 min | |
| Jul 29, 4:22 PM MDT | Special Weather Statement | SLC | Juab | 23 min |
| Jul 29, 4:37 PM MDT | Special Weather Statement | SLC | Garfield | 23 min |
| Jul 29, 4:48 PM MDT | Severe Thunderstorm Warning | SLC | Garfield, Iron | 27 min |
| Jul 29, 4:54 PM MDT | Severe Thunderstorm Warning | SLC | Piute, Sevier | 36 min |
| Jul 29, 5:18 PM MDT | Special Weather Statement | SLC | Garfield | 27 min |
| Jul 29, 5:42 PM MDT | Severe Thunderstorm Warning | SLC | Garfield | 33 min |
Nearby
Flash Flood Watches in Utah, 2021Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.