Alert archive / Utah / Flood Watches in 2021
Flood Watch 2, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flood watch at Oct 7, 2021, 2:45 PM MDT for 11 counties in Utah. It took effect at Oct 8, 2021, 8:00 AM MDT. It was in force for 16 hr.
The area
The counties it named.
The facts
- Issued
- Oct 7, 2021, 2:45 PM MDT (20:45 UTC)
- In effect from
- Oct 8, 2021, 8:00 AM MDT
- Expired
- Oct 9, 2021, 12:00 AM MDT
- In force
- 16 hr
- Issued by
- NWS Salt Lake City, UT
- Flood severity
- None
Counties Box Elder County, UT, Cache County, UT, Davis County, UT, Iron County, UT, Kane County, UT, Morgan County, UT, Rich County, UT, Salt Lake County, UT, Summit County, UT, Washington County, UT, Weber County, UT
The radar
The Salt Lake City radar (KMTX), 122 km from the middle of the area, began a volume at 20:44 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 12:00Z, 8.8 hours before the alert went out and 67 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
- 40 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 1145 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 148 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
756 WGUS65 KSLC 072045 FFASLC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Salt Lake City UT 245 PM MDT Thu Oct 7 2021 UTZ103-107-110-080445- /O.NEW.KSLC.FA.A.0002.211008T1800Z-211009T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Eastern Box Elder County-Cache Valley/Utah Portion-Wasatch Mountains I-80 North- Including the cities of Logan Summit, Logan, Snowville, Mantua, Smithfield, and Brigham City 245 PM MDT Thu Oct 7 2021 ...FLOOD WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH FRIDAY EVENING... The National Weather Service in Salt Lake City has issued a * Flood Watch for a portion of Utah, including the following areas, Cache Valley/Utah Portion, Eastern Box Elder County and Wasatch Mountains I-80 North. * From Friday afternoon through Friday evening. * Heavy rain with embedded thunderstorms are expected to develop over northern Utah Friday afternoon and evening, especially along an axis from around Tremonton and Brigham City to Logan. * Heavy rain may result in flooding of basements, poor drainage areas, urban areas, and small streams. No main stem river flooding is expected. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ Church
4 follow-up statements
302 WGUS65 KSLC 081010 FFASLC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Salt Lake City UT 410 AM MDT Fri Oct 8 2021 UTZ124-081900- /O.EXB.KSLC.FA.A.0002.211008T1400Z-211009T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Zion National Park- Including the cities of Springdale 410 AM MDT Fri Oct 8 2021 ...FLOOD WATCH IN EFFECT FROM 8 AM MDT THIS MORNING THROUGH THIS AFTERNOON... The National Weather Service in Salt Lake City has expanded the * Flood Watch to include a portion of Utah, including the following area, Zion National Park. * From 8 AM MDT this morning through this afternoon. * Widespread rainfall will move over Zion National Park this morning, and continue into early afternoon before tapering to showers. This rainfall will become moderate to heavy at times, with totals approaching 1 inch expected across the watch area. * Flooding is possible within all slot canyons, small streams, and normally dry washes across the watch area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ UTZ103-107-110-081900- /O.CON.KSLC.FA.A.0002.211008T1800Z-211009T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Eastern Box Elder County-Cache Valley/Utah Portion-Wasatch Mountains I-80 North- Including the cities of Logan Summit, Logan, Snowville, Mantua, Smithfield, and Brigham City 410 AM MDT Fri Oct 8 2021 ...FLOOD WATCH REMAINS IN EFFECT FROM NOON MDT TODAY THROUGH THIS EVENING... The Flood Watch continues for * A portion of Utah, including the following areas, Cache Valley/Utah Portion, Eastern Box Elder County and Wasatch Mountains I-80 North. * From Noon MDT today through this evening. * Heavy rain with embedded thunderstorms are expected to develop over northern Utah Friday afternoon and evening, especially along an axis from around Tremonton and Brigham City to Logan. * Heavy rain may result in flooding of basements, poor drainage areas, urban areas, and small streams. No main stem river flooding is expected. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ MPS
647 WGUS65 KSLC 081849 FFASLC Flood Watch National Weather Service Salt Lake City UT 1249 PM MDT Fri Oct 8 2021 UTZ103-107-110-090300- /O.CON.KSLC.FA.A.0002.000000T0000Z-211009T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Eastern Box Elder County-Cache Valley/Utah Portion-Wasatch Mountains I-80 North- Including the cities of Logan Summit, Logan, Snowville, Mantua, Smithfield, and Brigham City 1249 PM MDT Fri Oct 8 2021 ...FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... The Flood Watch continues for * A portion of Utah, including the following areas, Cache Valley/Utah Portion, Eastern Box Elder County and Wasatch Mountains I-80 North. * Until Midnight MDT tonight. * Heavy rain with embedded thunderstorms is expected to continue through late evening, especially along an axis from around Tremonton and Brigham City to Logan. * Heavy rain may result in flooding of basements, poor drainage areas, urban areas, and small streams. No main stem river flooding is expected. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ UTZ124-090000- /O.CON.KSLC.FA.A.0002.000000T0000Z-211009T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Zion National Park- Including the cities of Springdale 1249 PM MDT Fri Oct 8 2021 ...FLOOD WATCH REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... The Flood Watch continues for * A portion of Utah, including the following area, Zion National Park. * Until 6 PM MDT this evening. * Widespread rainfall will continue into early afternoon before tapering to showers. This rainfall will continue to be moderate to heavy at times, with totals approaching 1 inch expected across the watch area. * Flooding is possible within all slot canyons, small streams, and normally dry washes across the watch area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CRK
001 WGUS65 KSLC 082359 FFASLC Flood Watch National Weather Service Salt Lake City UT 559 PM MDT Fri Oct 8 2021 UTZ124-090100- /O.EXP.KSLC.FA.A.0002.000000T0000Z-211009T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Zion National Park- Including the cities of Springdale 559 PM MDT Fri Oct 8 2021 ...FLOOD WATCH WILL EXPIRE AT 6 PM MDT THIS EVENING... The Flood Watch will expire at 6 PM MDT this evening for a portion of Utah, including the following area, Zion National Park. The Flood Watch will expire at 6PM MDT. Rain is ending across the area. Elevated flows will continue to recede. $$ UTZ103-107-110-090600- /O.CON.KSLC.FA.A.0002.000000T0000Z-211009T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Eastern Box Elder County-Cache Valley/Utah Portion-Wasatch Mountains I-80 North- Including the cities of Logan Summit, Logan, Snowville, Mantua, Smithfield, and Brigham City 559 PM MDT Fri Oct 8 2021 ...FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... The Flood Watch continues for * A portion of Utah, including the following areas, Cache Valley/Utah Portion, Eastern Box Elder County and Wasatch Mountains I-80 North. * Until Midnight MDT tonight. * Heavy rain with embedded thunderstorms is expected to continue through late evening, especially along an axis from around Tremonton and Brigham City to Logan. * Heavy rain may result in flooding of basements, poor drainage areas, urban areas, and small streams. No main stem river flooding is expected. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ AD
109 WGUS65 KSLC 090558 FFASLC Flood Watch National Weather Service Salt Lake City UT 1158 PM MDT Fri Oct 8 2021 UTZ103-107-110-090700- /O.EXP.KSLC.FA.A.0002.000000T0000Z-211009T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Eastern Box Elder County-Cache Valley/Utah Portion-Wasatch Mountains I-80 North- Including the cities of Logan Summit, Logan, Snowville, Mantua, Smithfield, and Brigham City 1158 PM MDT Fri Oct 8 2021 ...FLOOD WATCH WILL EXPIRE AT MIDNIGHT MDT TONIGHT... The Flood Watch will expire at Midnight MDT tonight for a portion of Utah, including the following areas, Cache Valley/Utah Portion, Eastern Box Elder County and Wasatch Mountains I-80 North. Showers will continue into the overnight hours across northern Utah, however flooding is no longer expected to pose a significant threat. $$ MPS
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 7, 3:09 PM MDT | Winter Weather Advisory | SLC | Duchesne, Summit, Wasatch | 51 hr |
Nearby
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.