Alert archive / Utah / Wind Advisories in 2021
Wind Advisory 17, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this wind advisory at Apr 18, 2021, 2:59 AM MDT for 8 counties in Utah. It took effect at Apr 19, 2021, 9:00 AM MDT. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Apr 18, 2021, 2:59 AM MDT (08:59 UTC)
- In effect from
- Apr 19, 2021, 9:00 AM MDT
- Expired
- Apr 19, 2021, 9:00 PM MDT
- In force
- 12 hr
- Issued by
- NWS Salt Lake City, UT
Counties Box Elder County, UT, Carbon County, UT, Duchesne County, UT, Emery County, UT, Salt Lake County, UT, Sevier County, UT, Tooele County, UT, Utah County, UT
The radar
The Salt Lake City radar (KMTX), 150 km from the middle of the area, began a volume at 09:00 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, 9.0 hours before the alert went out and 83 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2371 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 184 m²/s²
- 0-3 km storm-relative helicity
- 251 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
068 WWUS75 KSLC 180859 NPWSLC URGENT - WEATHER MESSAGE National Weather Service Salt Lake City UT 259 AM MDT Sun Apr 18 2021 UTZ114-120-121-181700- /O.NEW.KSLC.WI.Y.0017.210419T1800Z-210420T0300Z/ Western Uinta Basin-Castle Country-San Rafael Swell- Including the cities of Duchesne, Roosevelt, Price, Castle Dale, Emery, Green River, and Goblin Valley 259 AM MDT Sun Apr 18 2021 ...WIND ADVISORY IN EFFECT FROM NOON TO 9 PM MDT MONDAY... * WHAT...West winds 25 to 30 mph with gusts up to 50 mph expected. * WHERE...Western Uinta Basin, Castle Country and San Rafael Swell. * WHEN...From noon to 9 PM MDT Monday. * IMPACTS...Gusty winds could blow around unsecured objects. A few power outages are possible. * ADDITIONAL DETAILS...Strong crosswinds will make for difficult travel for high-profile vehicles on portions of US-191, US-40, US-6, SR-10, SR-24 and I-70. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ UTZ101-103-107-181700- /O.NEW.KSLC.HZ.A.0001.210420T0600Z-210420T1600Z/ Great Salt Lake Desert and Mountains-Eastern Box Elder County- Cache Valley/Utah Portion- Including the cities of Wendover, Dugway, Park Valley, Brigham City, Snowville, Logan, and Smithfield 259 AM MDT Sun Apr 18 2021 ...HARD FREEZE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING... * WHAT...Sub-freezing temperatures 24 to 28 degrees possible. * WHERE...Great Salt Lake Desert and Mountains, Eastern Box Elder County and Cache Valley/Utah Portion. * WHEN...From late Monday night through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity For information on potential travel impacts visit... http://udottraffic.utah.gov/roadweatherforecast.aspx
6 follow-up statements
393 WWUS75 KSLC 182116 NPWSLC URGENT - WEATHER MESSAGE National Weather Service Salt Lake City UT 316 PM MDT Sun Apr 18 2021 UTZ101-103-107-190530- /O.UPG.KSLC.HZ.A.0001.210420T0600Z-210420T1600Z/ /O.NEW.KSLC.HZ.W.0001.210420T0600Z-210420T1600Z/ Great Salt Lake Desert and Mountains-Eastern Box Elder County- Cache Valley/Utah Portion- Including the cities of Wendover, Dugway, Park Valley, Brigham City, Snowville, Logan, and Smithfield 316 PM MDT Sun Apr 18 2021 ...HARD FREEZE WARNING IN EFFECT FROM MIDNIGHT MONDAY NIGHT TO 10 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures 24 to 28 degrees expected. * WHERE...Great Salt Lake Desert and Mountains, Eastern Box Elder County and Cache Valley/Utah Portion. * WHEN...From midnight Monday night to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could cause damage to crops, other sensitive vegetation, and potentially unprotected outdoor plumbing. * ADDITIONAL DETAILS...Most of the impacts will be from from northern Box Elder County, for example the Park Valley area, eastward through the Tremonton/Brigham City area and into the Cache Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Outdoor plumbing recently activated for the spring season may need attention. && $$ UTZ114-120-121-190530- /O.CON.KSLC.WI.Y.0017.210419T1800Z-210420T0300Z/ Western Uinta Basin-Castle Country-San Rafael Swell- Including the cities of Duchesne, Roosevelt, Price, Castle Dale, Emery, Green River, and Goblin Valley 316 PM MDT Sun Apr 18 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM NOON TO 9 PM MDT MONDAY... * WHAT...West winds 25 to 30 mph with gusts up to 50 mph expected. * WHERE...Western Uinta Basin, Castle Country and San Rafael Swell. * WHEN...From noon to 9 PM MDT Monday. * IMPACTS...Gusty winds could blow around unsecured objects. A few power outages are possible. * ADDITIONAL DETAILS...Strong crosswinds will make for difficult travel for high-profile vehicles on portions of US-191, US-40, US- 6, SR-10, SR-24, and I-70. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity For information on potential travel impacts visit... http://udottraffic.utah.gov/roadweatherforecast.aspx
336 WWUS75 KSLC 182119 NPWSLC URGENT - WEATHER MESSAGE National Weather Service Salt Lake City UT 319 PM MDT Sun Apr 18 2021 UTZ101-103-107-191200- /O.CON.KSLC.HZ.W.0001.210420T0600Z-210420T1600Z/ Great Salt Lake Desert and Mountains-Eastern Box Elder County- Cache Valley/Utah Portion- Including the cities of Wendover, Dugway, Park Valley, Brigham City, Snowville, Logan, and Smithfield 319 PM MDT Sun Apr 18 2021 ...HARD FREEZE WARNING IN EFFECT FROM MIDNIGHT MONDAY NIGHT TO 10 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures 24 to 28 degrees expected. * WHERE...Great Salt Lake Desert and Mountains, Eastern Box Elder County and Cache Valley/Utah Portion. * WHEN...From midnight Monday night to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could cause damage to crops, other sensitive vegetation, and potentially unprotected outdoor plumbing. * ADDITIONAL DETAILS...Most of the impacts will be from from northern Box Elder County, for example the Park Valley area, eastward through the Tremonton/Brigham City area and into the Cache Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Outdoor plumbing recently activated for the spring season may need attention. && $$ UTZ114-120-121-191200- /O.CON.KSLC.WI.Y.0017.210419T1800Z-210420T0300Z/ Western Uinta Basin-Castle Country-San Rafael Swell- Including the cities of Duchesne, Roosevelt, Price, Castle Dale, Emery, Green River, and Goblin Valley 319 PM MDT Sun Apr 18 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM NOON TO 9 PM MDT MONDAY... * WHAT...West winds 25 to 30 mph with gusts up to 50 mph expected. * WHERE...Western Uinta Basin, Castle Country and San Rafael Swell. * WHEN...From noon to 9 PM MDT Monday. * IMPACTS...Gusty winds could blow around unsecured objects. A few power outages are possible. * ADDITIONAL DETAILS...Strong crosswinds will make for difficult travel for high-profile vehicles on portions of US-191, US-40, US- 6, SR-10, SR-24, and I-70. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity For information on potential travel impacts visit... http://udottraffic.utah.gov/roadweatherforecast.aspx
164 WWUS75 KSLC 190535 NPWSLC URGENT - WEATHER MESSAGE National Weather Service Salt Lake City UT 1135 PM MDT Sun Apr 18 2021 UTZ101-103-107-191400- /O.CON.KSLC.HZ.W.0001.210420T0600Z-210420T1600Z/ Great Salt Lake Desert and Mountains-Eastern Box Elder County- Cache Valley/Utah Portion- Including the cities of Wendover, Dugway, Park Valley, Brigham City, Snowville, Logan, and Smithfield 1135 PM MDT Sun Apr 18 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT MONDAY NIGHT TO 10 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures 24 to 28 degrees expected. * WHERE...Cache Valley/Utah Portion, Eastern Box Elder County and Great Salt Lake Desert and Mountains. * WHEN...From midnight Monday night to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could cause damage to crops, other sensitive vegetation, and potentially unprotected outdoor plumbing. * ADDITIONAL DETAILS...Most of the impacts will be from from northern Box Elder County, for example the Park Valley area, eastward through the Tremonton/Brigham City area and into the Cache Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Outdoor plumbing recently activated for the spring season may need attention. && $$ UTZ114-120-121-191400- /O.CON.KSLC.WI.Y.0017.210419T1800Z-210420T0300Z/ Western Uinta Basin-Castle Country-San Rafael Swell- Including the cities of Duchesne, Roosevelt, Price, Castle Dale, Emery, Green River, and Goblin Valley 1135 PM MDT Sun Apr 18 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM NOON TO 9 PM MDT MONDAY... * WHAT...Northwest winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...Castle Country, San Rafael Swell and Western Uinta Basin. * WHEN...From noon to 9 PM MDT Monday. * IMPACTS...Gusty winds could blow around unsecured objects. A few power outages are possible. * ADDITIONAL DETAILS...Strong crosswinds will make for difficult travel for high-profile vehicles on portions of US-191, US-40, US- 6, SR-10, SR-24, and I-70. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity For information on potential travel impacts visit... http://udottraffic.utah.gov/roadweatherforecast.aspx
155 WWUS75 KSLC 190924 NPWSLC URGENT - WEATHER MESSAGE National Weather Service Salt Lake City UT 324 AM MDT Mon Apr 19 2021 UTZ101-191730- /O.EXB.KSLC.WI.Y.0017.210419T1500Z-210420T0300Z/ /O.CON.KSLC.HZ.W.0001.210420T0600Z-210420T1600Z/ Great Salt Lake Desert and Mountains- Including the cities of Wendover, Dugway, and Park Valley 324 AM MDT Mon Apr 19 2021 ...WIND ADVISORY IN EFFECT FROM 9 AM THIS MORNING TO 9 PM MDT THIS EVENING... ...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM MDT TUESDAY... * WHAT...For the Wind Advisory, northwest winds 20 to 30 mph with gusts up to 50 mph expected. For the Hard Freeze Warning, sub- freezing temperatures 24 to 28 degrees expected. * WHERE...Great Salt Lake Desert and Mountains. * WHEN...For the Wind Advisory, from 9 AM this morning to 9 PM MDT this evening. For the Hard Freeze Warning, from midnight tonight to 10 AM MDT Tuesday. * IMPACTS...Gusty winds could blow around unsecured objects. Difficult travel for high profile vehicles due to crosswinds on I-80 and SR-30. Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Hard freeze conditions expected mainly across northern Box Elder County from Park Valley to Snowville. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Take steps now to protect tender plants from the cold. Outdoor plumbing recently activated for the spring season may need attention. && $$ UTZ103-107-191730- /O.CON.KSLC.HZ.W.0001.210420T0600Z-210420T1600Z/ Eastern Box Elder County-Cache Valley/Utah Portion- Including the cities of Brigham City, Snowville, Logan, and Smithfield 324 AM MDT Mon Apr 19 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures 24 to 28 degrees expected. * WHERE...Cache Valley/Utah Portion and Eastern Box Elder County. * WHEN...From midnight tonight to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Most of the impacts will be from from northern Box Elder County, for example the Tremonton/Brigham City area and into the Cache Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Outdoor plumbing recently activated for the spring season may need attention. && $$ UTZ114-120-121-191730- /O.CON.KSLC.WI.Y.0017.210419T1800Z-210420T0300Z/ Western Uinta Basin-Castle Country-San Rafael Swell- Including the cities of Duchesne, Roosevelt, Price, Castle Dale, Emery, Green River, and Goblin Valley 324 AM MDT Mon Apr 19 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING... * WHAT...West winds 25 to 35 mph with gusts 45 to 55 mph expected. * WHERE...Castle Country, San Rafael Swell and Western Uinta Basin. * WHEN...From noon today to 9 PM MDT this evening. * IMPACTS...Gusty winds could blow around unsecured objects. A few power outages are possible. * ADDITIONAL DETAILS...Strong crosswinds will make for difficult travel for high-profile vehicles on portions of US-191, US-40, US- 6, SR-10, SR-24, and I-70. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity For information on potential travel impacts visit... http://udottraffic.utah.gov/roadweatherforecast.aspx
311 WWUS75 KSLC 191734 NPWSLC URGENT - WEATHER MESSAGE National Weather Service Salt Lake City UT 1134 AM MDT Mon Apr 19 2021 UTZ101-200600- /O.CON.KSLC.HZ.W.0001.210420T0600Z-210420T1600Z/ /O.CON.KSLC.WI.Y.0017.000000T0000Z-210420T0300Z/ Great Salt Lake Desert and Mountains- Including the cities of Wendover, Dugway, and Park Valley 1134 AM MDT Mon Apr 19 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING... ...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM MDT TUESDAY... * WHAT...For the Wind Advisory, northwest winds 20 to 30 mph with gusts up to 50 mph expected. For the Hard Freeze Warning, sub- freezing temperatures 24 to 28 degrees expected. * WHERE...Great Salt Lake Desert and Mountains. * WHEN...For the Wind Advisory, from 9 AM this morning to 9 PM MDT this evening. For the Hard Freeze Warning, from midnight tonight to 10 AM MDT Tuesday. * IMPACTS...Gusty winds could blow around unsecured objects. Difficult travel for high profile vehicles due to crosswinds on I- 80 and SR-30. Frost and freeze conditions may damage crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Hard freeze conditions expected mainly across northern Box Elder County from Park Valley to Snowville. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Take steps now to protect tender plants from the cold. Outdoor plumbing recently activated for the spring season may need attention. && $$ UTZ103-107-200600- /O.CON.KSLC.HZ.W.0001.210420T0600Z-210420T1600Z/ Eastern Box Elder County-Cache Valley/Utah Portion- Including the cities of Brigham City, Snowville, Logan, and Smithfield 1134 AM MDT Mon Apr 19 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures 24 to 28 degrees expected. * WHERE...Cache Valley/Utah Portion and Eastern Box Elder County. * WHEN...From midnight tonight to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions may damage crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Most of the impacts will be from from northern Box Elder County, for example the Tremonton/Brigham City area and into the Cache Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Outdoor plumbing recently activated for the spring season may need attention. && $$ UTZ114-120-121-200300- /O.CON.KSLC.WI.Y.0017.210419T1800Z-210420T0300Z/ Western Uinta Basin-Castle Country-San Rafael Swell- Including the cities of Duchesne, Roosevelt, Price, Castle Dale, Emery, Green River, and Goblin Valley 1134 AM MDT Mon Apr 19 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING... * WHAT...West winds 25 to 35 mph with gusts 45 to 55 mph expected. * WHERE...Castle Country, San Rafael Swell and Western Uinta Basin. * WHEN...From noon today to 9 PM MDT this evening. * IMPACTS...Gusty winds could blow around unsecured objects. A few power outages are possible. * ADDITIONAL DETAILS...Strong crosswinds will make for difficult travel for high-profile vehicles on portions of US-191, US-40, US- 6, SR-10, SR-24, and I-70. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity For information on potential travel impacts visit... http://udottraffic.utah.gov/roadweatherforecast.aspx
352 WWUS75 KSLC 200255 NPWSLC URGENT - WEATHER MESSAGE National Weather Service Salt Lake City UT 855 PM MDT Mon Apr 19 2021 UTZ101-201600- /O.EXP.KSLC.WI.Y.0017.000000T0000Z-210420T0300Z/ /O.CON.KSLC.HZ.W.0001.210420T0600Z-210420T1600Z/ Great Salt Lake Desert and Mountains- Including the cities of Wendover, Dugway, and Park Valley 855 PM MDT Mon Apr 19 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM MDT TUESDAY... ...WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING... * WHAT...Sub-freezing temperatures 24 to 28 degrees expected. * WHERE...Great Salt Lake Desert and Mountains. * WHEN...From midnight tonight to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Hard freeze conditions expected mainly across northern Box Elder County from Park Valley to Snowville. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Outdoor plumbing recently activated for the spring season may need attention. && $$ UTZ114-120-121-200400- /O.EXP.KSLC.WI.Y.0017.000000T0000Z-210420T0300Z/ Western Uinta Basin-Castle Country-San Rafael Swell- Including the cities of Duchesne, Roosevelt, Price, Castle Dale, Emery, Green River, and Goblin Valley 855 PM MDT Mon Apr 19 2021 ...WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING... Winds have decreased below advisory criteria across the western Uinta Basin, Castle Country, and the San Rafael Swell and will continue to weaken through the rest of the evening. $$ UTZ103-107-201600- /O.CON.KSLC.HZ.W.0001.210420T0600Z-210420T1600Z/ Eastern Box Elder County-Cache Valley/Utah Portion- Including the cities of Brigham City, Snowville, Logan, and Smithfield 855 PM MDT Mon Apr 19 2021 ...HARD FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 25 expected. * WHERE...Cache Valley/Utah Portion and Eastern Box Elder County. * WHEN...From midnight tonight to 10 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions may damage crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Most of the impacts will be from from northern Box Elder County, for example the Tremonton/Brigham City area and into the Cache Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Outdoor plumbing recently activated for the spring season may need attention. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity For information on potential travel impacts visit... http://udottraffic.utah.gov/roadweatherforecast.aspx
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 2:59 AM MDT | Hard Freeze Watch | SLC | Box Elder, Cache, Salt Lake, Tooele, Utah | 12 hr |
| Apr 18, 3:16 PM MDT | Hard Freeze Warning | SLC | Box Elder, Cache, Salt Lake, Tooele, Utah | 43 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.