Alert archive / Utah / Flash Flood Watches in 2021
Flash Flood Watch 7, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood watch at Jul 24, 2021, 3:23 AM MDT for 7 counties in Utah. It took effect at Jul 24, 2021, 12:00 PM MDT. It was in force for 34 hr.
The area
The counties it named.
The facts
- Issued
- Jul 24, 2021, 3:23 AM MDT (09:23 UTC)
- In effect from
- Jul 24, 2021, 12:00 PM MDT
- Expired
- Jul 25, 2021, 9:52 PM MDT
- In force
- 34 hr
- Issued by
- NWS Salt Lake City, UT
- Flood severity
- None
Counties Beaver County, UT, Garfield County, UT, Iron County, UT, Kane County, UT, Piute County, UT, Washington County, UT, Wayne County, UT
The radar
The Cedar City radar (KICX), 57 km from the middle of the area, began a volume at 09:23 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
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 9.4 hours before the alert went out and 301 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
- 111 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 613 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 185 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
070 WGUS65 KSLC 240923 FFASLC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Salt Lake City UT 323 AM MDT Sat Jul 24 2021 UTZ123>125-242200- /O.NEW.KSLC.FF.A.0007.210724T1800Z-210725T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lower Washington County-Zion National Park-Southern Mountains- Including the cities of Alton, St George, Hurricane, Springdale, Brian Head, and Ivins 323 AM MDT Sat Jul 24 2021 ...FLASH FLOOD WATCH IN EFFECT FROM NOON MDT TODAY THROUGH THIS EVENING... The National Weather Service in Salt Lake City has issued a * Flash Flood Watch for a portion of Utah, including the following areas, Southern Mountains, Lower Washington County and Zion National Park. * From Noon MDT today through this evening. * Thunderstorms capable of heavy rainfall are expected to develop over the southern Utah mountains this afternoon and move southeast through Zion National Park and into lower Washington County through this evening. * Heavy rainfall may result in flash flooding, especially near the Brian Head burn scar, in Zion National Park, and sensitive drainages in lower Washington County. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ LC
5 follow-up statements
934 WGUS65 KSLC 241120 FFASLC Flood Watch National Weather Service Salt Lake City UT 520 AM MDT Sat Jul 24 2021 UTZ123>125-242200- /O.CON.KSLC.FF.A.0007.210724T1800Z-210725T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lower Washington County-Zion National Park-Southern Mountains- Including the cities of Alton, St George, Hurricane, Springdale, Brian Head, and Ivins 520 AM MDT Sat Jul 24 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM NOON MDT TODAY THROUGH THIS EVENING... The Flash Flood Watch continues for * A portion of Utah, including the following areas, Southern Mountains, Lower Washington County and Zion National Park. * From Noon MDT today through this evening. * Thunderstorms capable of heavy rainfall are expected to develop over the southern Utah mountains this afternoon and move southwest through Zion National Park and into lower Washington County through this evening. * Heavy rainfall may result in flash flooding, especially near the Brian Head burn scar, in Zion National Park, and sensitive drainages in lower Washington County. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ LC
725 WGUS65 KSLC 242052 FFASLC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Salt Lake City UT 252 PM MDT Sat Jul 24 2021 UTZ123>125-251100- /O.EXT.KSLC.FF.A.0007.000000T0000Z-210726T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lower Washington County-Zion National Park-Southern Mountains- Including the cities of Alton, St George, Hurricane, Springdale, Brian Head, and Ivins 252 PM MDT Sat Jul 24 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH SUNDAY EVENING... The Flash Flood Watch is now in effect for * A portion of Utah, including the following areas, Southern Mountains, Lower Washington County and Zion National Park. * Through Sunday evening. * Thunderstorms capable of producing heavy rainfall will continue over portions of southwest Utah through this evening, including Zion National Park and lower Washington County. After a break this evening and overnight, showers and thunderstorms capable of producing heavy rainfall are expected to develop over these same areas Sunday afternoon and evening. * Heavy rainfall may result in flash flooding, especially near the Brian Head burn scar, in Zion National Park, and sensitive drainages in lower Washington County. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ MT
488 WGUS65 KSLC 250949 FFASLC Flood Watch National Weather Service Salt Lake City UT 349 AM MDT Sun Jul 25 2021 UTZ123>125-252200- /O.CON.KSLC.FF.A.0007.000000T0000Z-210726T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lower Washington County-Zion National Park-Southern Mountains- Including the cities of Alton, St George, Hurricane, Springdale, Brian Head, and Ivins 349 AM MDT Sun Jul 25 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * A portion of Utah, including the following areas, Southern Mountains, Lower Washington County and Zion National Park. * Through this evening. * Thunderstorms capable of producing heavy rainfall will develop over portions of southwest Utah again today. The strongest storms are expected over the southern mountains and move southwest towards Zion National Park and lower Washington County this afternoon and evening. * Heavy rainfall may result in flash flooding, especially near the Brian Head burn scar, in Zion National Park, and sensitive drainages in lower Washington County. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ LC
388 WGUS65 KSLC 252103 FFASLC Flood Watch National Weather Service Salt Lake City UT 303 PM MDT Sun Jul 25 2021 UTZ123>125-260400- /O.CON.KSLC.FF.A.0007.000000T0000Z-210726T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lower Washington County-Zion National Park-Southern Mountains- Including the cities of Alton, St George, Hurricane, Springdale, Brian Head, and Ivins 303 PM MDT Sun Jul 25 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING... The Flash Flood Watch continues for * A portion of Utah, including the following areas, Southern Mountains, Lower Washington County and Zion National Park. * Until 10 PM MDT this evening. * Thunderstorms capable of producing heavy rainfall will continue through this evening over southwest Utah. The strongest storms are expected over the southern mountains, moving southwest toward Zion National Park and lower Washington county this evening. * Heavy rainfall may result in flash flooding, especially near the Brian Head burn scar, in Zion National Park, and sensitive drainages in lower Washington County. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ MT
285 WGUS65 KSLC 260352 FFASLC Flood Watch National Weather Service Salt Lake City UT 952 PM MDT Sun Jul 25 2021 UTZ123>125-260500- /O.CAN.KSLC.FF.A.0007.000000T0000Z-210726T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lower Washington County-Zion National Park-Southern Mountains- Including the cities of Alton, St George, Hurricane, Springdale, Brian Head, and Ivins 952 PM MDT Sun Jul 25 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch has been cancelled for a portion of Utah, including the following areas, Southern Mountains, Lower Washington County and Zion National Park. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat for the remainder of tonight. $$ WFO SLC
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 6:14 PM MDT | Areal Flood Advisory | SLC | Washington | 61 min |
| Jul 24, 12:56 PM MDT | Flash Flood Warning | SLC | Kane | 3 hr |
| Jul 24, 12:58 PM MDT | Special Weather Statement | SLC | Kane | 32 min |
| Jul 24, 1:34 PM MDT | Flash Flood Warning | SLC | Garfield, Kane | 4 hr |
| Jul 24, 2:13 PM MDT | Flash Flood Warning | SLC | Washington | 3 hr |
| Jul 24, 2:24 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 21 min |
| Jul 24, 3:16 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 29 min |
| Jul 24, 3:40 PM MDT | Severe Thunderstorm Warning | SLC | Iron, Washington | 35 min |
| Jul 24, 4:04 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 26 min |
| Jul 24, 4:07 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 3 hr |
| Jul 24, 4:12 PM MDT | Flash Flood Warning | SLC | Iron, Washington | 3 hr |
| Jul 24, 4:30 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 30 min |
| Jul 24, 5:24 PM MDT | Flash Flood Warning | SLC | Washington | 3 hr |
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.