Alert archive / Utah / Flash Flood Watches in 2021
Flash Flood Watch 4, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood watch at Jul 19, 2021, 4:32 AM MDT for 18 counties in Utah. It took effect at Jul 19, 2021, 1:00 PM MDT. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- Jul 19, 2021, 4:32 AM MDT (10:32 UTC)
- In effect from
- Jul 19, 2021, 1:00 PM MDT
- Expired
- Jul 20, 2021, 12:00 AM MDT
- In force
- 11 hr
- Issued by
- NWS Salt Lake City, UT
- Flood severity
- None
Counties Beaver County, UT, Carbon County, UT, Duchesne County, UT, Emery County, UT, Garfield County, UT, Iron County, UT, Juab County, UT, Kane County, UT, Millard County, UT, Piute County, UT, Salt Lake County, UT, Sanpete County, UT, Sevier County, UT, Summit County, UT, Utah County, UT, Wasatch County, UT, Washington County, UT, Wayne County, UT
The radar
The Cedar City radar (KICX), 186 km from the middle of the area, began a volume at 10:35 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
Salt Lake City I, UT (KSLC), launched 00:00Z, 10.5 hours before the alert went out and 191 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
- 79 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 4022 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
054 WGUS65 KSLC 191032 FFASLC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Salt Lake City UT 432 AM MDT Mon Jul 19 2021 UTZ106-111-113-117-191845- /O.NEW.KSLC.FF.A.0004.210719T1900Z-210720T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Utah Valley-Wasatch Mountains South of I-80-Wasatch Plateau/Book Cliffs-Central Mountains- Including the cities of Fish Lake, Indian Canyon, Lehi, Provo, Alta, Payson, Joes Valley, Scofield, Cove Fort, and Brighton 432 AM MDT Mon Jul 19 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 1 PM MDT THIS AFTERNOON 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, Central Mountains, Wasatch Plateau/Book Cliffs, Utah Valley and Wasatch Mountains South of I-80. * From 1 PM MDT this afternoon through this evening. * The potential for heavy rainfall and flash flooding or debris flows exists this afternoon and evening over burn scars as thunderstorms develop and move from south to north over the watch area. * Heavy rainfall may result in flash flooding or debris flows over area burn scars, including: Trail Mountain, Bear, Dollar Ridge, Tank Hollow, Bald Mountain, Pole Creek, William, Ether Hollow and Knolls. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecast and be prepared to take action should Flash Flood Warnings be issued. && $$ Church
3 follow-up statements
786 WGUS65 KSLC 191734 FFASLC Flood Watch National Weather Service Salt Lake City UT 1134 AM MDT Mon Jul 19 2021 UTZ106-111-113-117-200600- /O.CON.KSLC.FF.A.0004.210719T1900Z-210720T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Utah Valley-Wasatch Mountains South of I-80-Wasatch Plateau/Book Cliffs-Central Mountains- Including the cities of Fish Lake, Indian Canyon, Lehi, Provo, Alta, Payson, Joes Valley, Scofield, Cove Fort, and Brighton 1134 AM MDT Mon Jul 19 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * A portion of Utah, including the following areas, Central Mountains, Wasatch Plateau/Book Cliffs, Utah Valley and Wasatch Mountains South of I-80. * Through this evening. * The potential for heavy rainfall and flash flooding or debris flows exists this afternoon and evening over burn scars as thunderstorms develop and move from south to north over the watch area. * Heavy rainfall may result in flash flooding or debris flows over area burn scars, including: Trail Mountain, Bear, Dollar Ridge, Tank Hollow, Bald Mountain, Pole Creek, William, Ether Hollow and Knolls. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecast and be prepared to take action should Flash Flood Warnings be issued. && $$ WFO SLC
721 WGUS65 KSLC 192026 FFASLC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Salt Lake City UT 226 PM MDT Mon Jul 19 2021 UTZ115-116-122-124-125-200600- /O.EXA.KSLC.FF.A.0004.000000T0000Z-210720T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Western Millard and Juab Counties-Eastern Juab/Millard Counties- Southwest Utah-Zion National Park-Southern Mountains- Including the cities of Milford, Fillmore, Alton, Springdale, Cedar City, Nephi, Little Sahara, Delta, Brian Head, Beaver, and Scipio 226 PM MDT Mon Jul 19 2021 ...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... The National Weather Service in Salt Lake City has expanded the * Flash Flood Watch to include a portion of Utah, including the following areas, Eastern Juab/Millard Counties, Western Millard and Juab Counties, Southern Mountains, Southwest Utah and Zion National Park. * Until Midnight MDT tonight. * The potential for heavy rainfall and flash flooding or debris flows exists this afternoon and evening over burn scars, normally dry washes and streams surrounded by steep slopes as thunderstorms develop and move from south to north over the watch area. * Heavy rainfall may result in flash flooding or debris flows over the area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ UTZ106-111-113-117-200600- /O.CON.KSLC.FF.A.0004.000000T0000Z-210720T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Utah Valley-Wasatch Mountains South of I-80-Wasatch Plateau/Book Cliffs-Central Mountains- Including the cities of Fish Lake, Indian Canyon, Lehi, Provo, Alta, Payson, Joes Valley, Scofield, Cove Fort, and Brighton 226 PM MDT Mon Jul 19 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... The Flash Flood Watch continues for * A portion of Utah, including the following areas, Central Mountains, Wasatch Plateau/Book Cliffs, Utah Valley and Wasatch Mountains South of I-80. * Until Midnight MDT tonight. * The potential for heavy rainfall and flash flooding or debris flows exists this afternoon and evening over burn scars as thunderstorms develop and move from south to north over the watch area. * Heavy rainfall may result in flash flooding or debris flows over area burn scars, including: Trail Mountain, Bear, Dollar Ridge, Tank Hollow, Bald Mountain, Pole Creek, William, Ether Hollow and Knolls. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecast and be prepared to take action should Flash Flood Warnings be issued. && $$ WFO SLC
617 WGUS65 KSLC 200553 FFASLC Flood Watch National Weather Service Salt Lake City UT 1153 PM MDT Mon Jul 19 2021 UTZ106-111-113-115>117-122-124-125-200700- /O.EXP.KSLC.FF.A.0004.000000T0000Z-210720T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Utah Valley-Wasatch Mountains South of I-80-Wasatch Plateau/Book Cliffs-Western Millard and Juab Counties-Eastern Juab/Millard Counties-Central Mountains-Southwest Utah-Zion National Park- Southern Mountains- Including the cities of Cedar City, Milford, Fillmore, Fish Lake, Joes Valley, Springdale, Indian Canyon, Delta, Lehi, Provo, Alta, Payson, Nephi, Little Sahara, Alton, Scofield, Brian Head, Cove Fort, Scipio, Beaver, and Brighton 1153 PM MDT Mon Jul 19 2021 ...FLASH FLOOD WATCH WILL EXPIRE AT MIDNIGHT MDT TONIGHT... The Flash Flood Watch will expire at Midnight MDT tonight for a portion of Utah, including the following areas, Central Mountains, Eastern Juab/Millard Counties, Wasatch Plateau/Book Cliffs, Western Millard and Juab Counties, Utah Valley, Wasatch Mountains South of I-80, Southern Mountains, Southwest Utah and Zion National Park. 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 18, 7:02 PM MDT | Special Weather Statement | SLC | Tooele | 43 min |
| Jul 18, 7:54 PM MDT | Special Weather Statement | SLC | Tooele | 51 min |
| Jul 19, 1:44 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 5 hr |
| Jul 19, 2:34 PM MDT | Flash Flood Warning | SLC | Iron, Washington | 3 hr |
| Jul 19, 2:45 PM MDT | Areal Flood Advisory | SLC | Iron | 3 hr |
| Jul 19, 2:53 PM MDT | Special Weather Statement | SLC | Iron | 52 min |
| Jul 19, 3:04 PM MDT | Flash Flood Warning | SLC | Iron | 3 hr |
| Jul 19, 3:22 PM MDT | Severe Thunderstorm Warning | SLC | Iron | 38 min |
| Jul 19, 3:46 PM MDT | Special Weather Statement | SLC | Utah | 44 min |
| Jul 19, 4:54 PM MDT | Special Weather Statement | SLC | Davis, Salt Lake | 36 min |
| Jul 19, 5:57 PM MDT | Flash Flood Warning | SLC | Iron, 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.