Alert archive / California / Wind Advisories in 2020
Wind Advisory 21, NWS Phoenix, AZ
NWS Phoenix, AZ issued this wind advisory at Jun 4, 2020, 2:33 PM PDT for Imperial County, Riverside County, California. It took effect at Jun 5, 2020, 2:00 PM PDT. It was in force for 39 hr.
The area
The counties it named.
The facts
- Issued
- Jun 4, 2020, 2:33 PM PDT (21:33 UTC)
- In effect from
- Jun 5, 2020, 2:00 PM PDT
- Expired
- Jun 7, 2020, 5:00 AM PDT
- In force
- 39 hr
- Issued by
- NWS Phoenix, AZ
Counties Imperial County, CA, Riverside County, CA
The radar
The San Diego radar (KNKX), 137 km from the middle of the area, began a volume at 21:32 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
Yuma Prvg Ground, AZ (K1Y7), launched 12:00Z, 9.6 hours before the alert went out and 155 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
- 3745 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
021 WWUS75 KPSR 042133 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 233 PM MST Thu Jun 4 2020 CAZ562-563-566-567-050945- /O.NEW.KPSR.WI.Y.0021.200605T2100Z-200606T0600Z/ /O.CON.KPSR.EH.W.0005.000000T0000Z-200605T0300Z/ Imperial County Southwest-Salton Sea-Imperial County West- Imperial Valley- Including the cities of Desert Shores, Coolidge Springs, Salton City, Winona, Coyote Wells, Ocotillo, Plaster City, El Centro, Calexico, Alamorio, and Brawley 233 PM PDT Thu Jun 4 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT THIS EVENING... ...WIND ADVISORY IN EFFECT FROM 2 PM TO 11 PM PDT FRIDAY... * WHAT...For the Excessive Heat Warning, dangerously hot conditions. Afternoon temperatures 105 to 112. For the Wind Advisory, west winds 15 to 25 mph with gusts up to 45 to 55 mph expected. * WHERE...Southwest corner of Imperial County, Salton Sea, Western Imperial County and Imperial Valley. * WHEN...For the Excessive Heat Warning, until 8 PM PDT this evening. For the Wind Advisory, from 2 PM to 11 PM PDT Friday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne. Minor tree damage possible. High HeatRisk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Advisory means that sustained wind speeds of between 30 and 40 mph are expected, or wind gusts of between 40 and 58 mph. Winds this strong can make driving difficult, especially for high profile vehicles. In addition, strong winds over desert areas could result in briefly lowered visibilities to well under a mile at times in blowing dust or blowing sand. Use extra caution. An Excessive Heat Warning means that a period of very hot temperatures, even by local standards, will occur. Actions should be taken to lessen the impact of the extreme heat. Stay indoors and seek air-conditioned buildings. Drink water, more than usual, and avoid dehydrating alcoholic, sugary, or caffeinated drinks. Dress for the heat - lightweight and light- colored clothing. Eat small meals and eat more often. Monitor those with a higher vulnerability to heat, including small children. Check in on family, friends, and neighbors, especially the elderly. If engaging in outdoor activity, take longer and more frequent breaks and avoid the hottest parts of the day. Never leave kids or pets unattended in cars. Public cooling shelters are available in some areas. Consult county officials for more details, which may include guidance for proper social distancing measures. Recognize the signs and symptoms of heat-related illness. Early signs include thirst and muscle cramps. Heat exhaustion may include: cool, moist, pale skin; headache; dizziness; weakness or exhaustion; nausea. The most serious illness is heat stroke, which may include: vomiting; confusion; throbbing headache; decreased alertness or loss of consciousness; high body temperature (above 105F); hot, dry skin; rapid, weak pulse; rapid, shallow breathing; seizures. Heat stroke can be DEADLY. Treat as an emergency and call 9 1 1. Continue to monitor NWS forecasts, broadcast outlets, and local government for updates. && $$ AZZ556-560>562-050300- /O.CON.KPSR.EH.W.0005.000000T0000Z-200605T0300Z/ Tonto Basin-San Carlos-Dripping Springs-Globe/Miami- Including the cities of Punkin Center, San Carlos, Hayden, Winkelman, Globe, and Miami 233 PM MST Thu Jun 4 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING... * WHAT...Dangerously hot conditions. Afternoon temperatures 101 to 107. * WHERE...Globe/Miami, San Carlos, Dripping Springs and Tonto Basin. * WHEN...Until 8 PM MST this evening. * IMPACTS...High HeatRisk. Increase in heat related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke can lead to death. PRECAUTIONARY/PREPAREDNESS ACTIONS... An Excessive Heat Warning means that a period of very hot temperatures, even by local standards, will occur. Actions should be taken to lessen the impact of the extreme heat. Stay indoors and seek air-conditioned buildings. Drink water, more than usual, and avoid dehydrating alcoholic, sugary, or caffeinated drinks. Dress for the heat - lightweight and light- colored clothing. Eat small meals and eat more often. Monitor those with a higher vulnerability to heat, including small children. Check in on family, friends, and neighbors, especially the elderly. If engaging in outdoor activity, take longer and more frequent breaks and avoid the hottest parts of the day. Never leave kids or pets unattended in cars. Public cooling shelters are available in some areas. Consult county officials for more details, which may include guidance for proper social distancing measures. Recognize the signs and symptoms of heat-related illness. Early signs include thirst and muscle cramps. Heat exhaustion may include: cool, moist, pale skin; headache; dizziness; weakness or exhaustion; nausea. The most serious illness is heat stroke, which may include: vomiting; confusion; throbbing headache; decreased alertness or loss of consciousness; high body temperature (above 105F); hot, dry skin; rapid, weak pulse; rapid, shallow breathing; seizures. Heat stroke can be DEADLY. Treat as an emergency and call 9 1 1. Continue to monitor NWS forecasts, broadcast outlets, and local government for updates. && $$ AZZ534-537>551-553>555-559-050300- /O.CON.KPSR.EH.W.0005.000000T0000Z-200605T0300Z/ Aguila Valley-Northwest Valley-Tonopah Desert-Gila Bend- Buckeye/Avondale-Cave Creek/New River-Deer Valley-Central Phoenix- North Phoenix/Glendale-New River Mesa-Scottsdale/Paradise Valley- Rio Verde/Salt River-East Valley-Fountain Hills/East Mesa- South Mountain/Ahwatukee-Southeast Valley/Queen Creek- Northwest Pinal County-West Pinal County- Apache Junction/Gold Canyon-Sonoran Desert Natl Monument- Including the cities of Aguila, Gladden, Wickenburg, Circle City, Surprise, Wittmann, Beardsley, Sun City West, Arlington, Hassayampa, Tonopah, Wintersburg, Gila Bend, Sentinel, Avondale, Cashion, Goodyear, Liberty, Scottsdale, Peoria, Phoenix, Paradise Valley, Tortilla Flat, Mesa, Chandler, Tempe, Gilbert, Fountain Hills, Sun Lakes, Queen Creek, Casa Grande, Florence, Coolidge, Apache Junction, and Kaka 233 PM MST Thu Jun 4 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING... * WHAT...Dangerously hot conditions. Afternoon temperatures 106 to 111. * WHERE...Portions of south central Arizona including the entire Phoenix Metro area. * WHEN...Until 8 PM MST this evening. * IMPACTS...Very High HeatRisk. Increase in heat related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke can lead to death. PRECAUTIONARY/PREPAREDNESS ACTIONS... An Excessive Heat Warning means that a period of very hot temperatures, even by local standards, will occur. Actions should be taken to lessen the impact of the extreme heat. Stay indoors and seek air-conditioned buildings. Drink water, more than usual, and avoid dehydrating alcoholic, sugary, or caffeinated drinks. Dress for the heat - lightweight and light- colored clothing. Eat small meals and eat more often. Monitor those with a higher vulnerability to heat, including small children. Check in on family, friends, and neighbors, especially the elderly. If engaging in outdoor activity, take longer and more frequent breaks and avoid the hottest parts of the day. Never leave kids or pets unattended in cars. Public cooling shelters are available in some areas. Consult county officials for more details, which may include guidance for proper social distancing measures. Recognize the signs and symptoms of heat-related illness. Early signs include thirst and muscle cramps. Heat exhaustion may include: cool, moist, pale skin; headache; dizziness; weakness or exhaustion; nausea. The most serious illness is heat stroke, which may include: vomiting; confusion; throbbing headache; decreased alertness or loss of consciousness; high body temperature (above 105F); hot, dry skin; rapid, weak pulse; rapid, shallow breathing; seizures. Heat stroke can be DEADLY. Treat as an emergency and call 9 1 1. Continue to monitor NWS forecasts, broadcast outlets, and local government for updates. && $$ AZZ530>533-535-536-CAZ561-564-565-568>570-050300- /O.CON.KPSR.EH.W.0005.000000T0000Z-200605T0300Z/ Parker Valley-Kofa-Yuma-Central La Paz-Southeast Yuma County- Gila River Valley-Joshua Tree NP East-Chuckwalla Mountains- Imperial County Southeast-Chiriaco Summit-Palo Verde Valley- Chuckwalla Valley- Including the cities of Parker, Ehrenberg, Palm Canyon, Yuma, Fortuna Foothills, Brenda, Harcuvar, Quartzsite, Vicksburg, Vicksburg Junction, Salome, Ligurta, Imperial Hot Mineral Springs, Winterhaven, Chiriaco Summit, Martinez Lake, Blythe, Palo Verde, Ripley, and Midland 233 PM MST Thu Jun 4 2020 /233 PM PDT Thu Jun 4 2020/ ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST /8 PM PDT/ THIS EVENING... * WHAT...Dangerously hot conditions. Afternoon temperatures 105 to 112. * WHERE...Portions of southwest Arizona including Yuma and southeast and southern California including the Imperial Valley. * WHEN...Until 8 PM MST /8 PM PDT/ this evening. * IMPACTS...High HeatRisk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. PRECAUTIONARY/PREPAREDNESS ACTIONS... An Excessive Heat Warning means that a period of very hot temperatures, even by local standards, will occur. Actions should be taken to lessen the impact of the extreme heat. Stay indoors and seek air-conditioned buildings. Drink water, more than usual, and avoid dehydrating alcoholic, sugary, or caffeinated drinks. Dress for the heat - lightweight and light- colored clothing. Eat small meals and eat more often. Monitor those with a higher vulnerability to heat, including small children. Check in on family, friends, and neighbors, especially the elderly. If engaging in outdoor activity, take longer and more frequent breaks and avoid the hottest parts of the day. Never leave kids or pets unattended in cars. Public cooling shelters are available in some areas. Consult county officials for more details, which may include guidance for proper social distancing measures. Recognize the signs and symptoms of heat-related illness. Early signs include thirst and muscle cramps. Heat exhaustion may include: cool, moist, pale skin; headache; dizziness; weakness or exhaustion; nausea. The most serious illness is heat stroke, which may include: vomiting; confusion; throbbing headache; decreased alertness or loss of consciousness; high body temperature (above 105F); hot, dry skin; rapid, weak pulse; rapid, shallow breathing; seizures. Heat stroke can be DEADLY. Treat as an emergency and call 9 1 1. Continue to monitor NWS forecasts, broadcast outlets, and local government for updates. && $$
6 follow-up statements
650 WWUS75 KPSR 050256 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 756 PM MST Thu Jun 4 2020 CAZ562-563-566-567-051130- /O.EXP.KPSR.EH.W.0005.000000T0000Z-200605T0300Z/ /O.CON.KPSR.WI.Y.0021.200605T2100Z-200606T0600Z/ Imperial County Southwest-Salton Sea-Imperial County West- Imperial Valley- Including the cities of Desert Shores, Coolidge Springs, Salton City, Winona, Coyote Wells, Ocotillo, Plaster City, El Centro, Calexico, Alamorio, and Brawley 756 PM PDT Thu Jun 4 2020 ...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM TO 11 PM PDT FRIDAY... ...EXCESSIVE HEAT WARNING WILL EXPIRE AT 8 PM PDT THIS EVENING... * WHAT...West winds 20 to 30 mph with gusts up to 55 mph expected. * WHERE...Southwest corner of Imperial County, Salton Sea, Western Imperial County and Imperial Valley. * WHEN...For the Wind Advisory, from 2 PM to 11 PM PDT Friday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne. Minor tree damage possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Advisory means that sustained wind speeds of between 30 and 40 mph are expected, or wind gusts of between 40 and 58 mph. Winds this strong can make driving difficult, especially for high profile vehicles. In addition, strong winds over desert areas could result in briefly lowered visibilities to well under a mile at times in blowing dust or blowing sand. Use extra caution. && $$ AZZ556-560>562-050400- /O.EXP.KPSR.EH.W.0005.000000T0000Z-200605T0300Z/ Tonto Basin-San Carlos-Dripping Springs-Globe/Miami- Including the cities of Punkin Center, San Carlos, Hayden, Winkelman, Globe, and Miami 756 PM MST Thu Jun 4 2020 ...EXCESSIVE HEAT WARNING WILL EXPIRE AT 8 PM MST THIS EVENING... Temperatures will steadily cool through the weekend. $$ AZZ534-537>551-553>555-559-050400- /O.EXP.KPSR.EH.W.0005.000000T0000Z-200605T0300Z/ Aguila Valley-Northwest Valley-Tonopah Desert-Gila Bend- Buckeye/Avondale-Cave Creek/New River-Deer Valley-Central Phoenix- North Phoenix/Glendale-New River Mesa-Scottsdale/Paradise Valley- Rio Verde/Salt River-East Valley-Fountain Hills/East Mesa- South Mountain/Ahwatukee-Southeast Valley/Queen Creek- Northwest Pinal County-West Pinal County- Apache Junction/Gold Canyon-Sonoran Desert Natl Monument- Including the cities of Aguila, Gladden, Wickenburg, Circle City, Surprise, Wittmann, Beardsley, Sun City West, Arlington, Hassayampa, Tonopah, Wintersburg, Gila Bend, Sentinel, Avondale, Cashion, Goodyear, Liberty, Scottsdale, Peoria, Phoenix, Paradise Valley, Tortilla Flat, Mesa, Chandler, Tempe, Gilbert, Fountain Hills, Sun Lakes, Queen Creek, Casa Grande, Florence, Coolidge, Apache Junction, and Kaka 756 PM MST Thu Jun 4 2020 ...EXCESSIVE HEAT WARNING WILL EXPIRE AT 8 PM MST THIS EVENING... Temperatures will steadily cool through the weekend. $$ AZZ530>533-535-536-CAZ561-564-565-568>570-050400- /O.EXP.KPSR.EH.W.0005.000000T0000Z-200605T0300Z/ Parker Valley-Kofa-Yuma-Central La Paz-Southeast Yuma County- Gila River Valley-Joshua Tree NP East-Chuckwalla Mountains- Imperial County Southeast-Chiriaco Summit-Palo Verde Valley- Chuckwalla Valley- Including the cities of Parker, Ehrenberg, Palm Canyon, Yuma, Fortuna Foothills, Brenda, Harcuvar, Quartzsite, Vicksburg, Vicksburg Junction, Salome, Ligurta, Imperial Hot Mineral Springs, Winterhaven, Chiriaco Summit, Martinez Lake, Blythe, Palo Verde, Ripley, and Midland 756 PM MST Thu Jun 4 2020 /756 PM PDT Thu Jun 4 2020/ ...EXCESSIVE HEAT WARNING WILL EXPIRE AT 8 PM MST /8 PM PDT/ THIS EVENING... Temperatures will steadily cool through the weekend. $$
340 WWUS75 KPSR 050848 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 148 AM MST Fri Jun 5 2020 CAZ562-052300- /O.EXT.KPSR.WI.Y.0021.200605T2100Z-200606T1300Z/ Imperial County Southwest- 148 AM PDT Fri Jun 5 2020 ...WIND ADVISORY NOW IN EFFECT FROM 2 PM THIS AFTERNOON TO 6 AM PDT SATURDAY... * WHAT...West winds 30 to 40 mph with gusts up to 55 mph expected. * WHERE...Southwest corner of Imperial County. * WHEN...From 2 PM this afternoon to 6 AM PDT Saturday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne. Minor tree damage possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Advisory means that sustained wind speeds of between 30 and 40 mph are expected, or wind gusts of between 40 and 58 mph. Winds this strong can make driving difficult, especially for high profile vehicles. In addition, strong winds over desert areas could result in briefly lowered visibilities to well under a mile at times in blowing dust or blowing sand. Use extra caution. && $$ CAZ563-566-567-052300- /O.CON.KPSR.WI.Y.0021.200605T2100Z-200606T0600Z/ Salton Sea-Imperial County West-Imperial Valley- Including the cities of Desert Shores, Coolidge Springs, Salton City, Winona, Coyote Wells, Plaster City, El Centro, Calexico, Alamorio, and Brawley 148 AM PDT Fri Jun 5 2020 ...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 11 PM PDT THIS EVENING... * WHAT...West winds 25 to 35 mph with gusts up to 45 mph expected. * WHERE...Salton Sea, Imperial Valley and Western Imperial County. * WHEN...From 2 PM this afternoon to 11 PM PDT this evening. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne. Minor tree damage possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Advisory means that sustained wind speeds of between 30 and 40 mph are expected, or wind gusts of between 40 and 58 mph. Winds this strong can make driving difficult, especially for high profile vehicles. In addition, strong winds over desert areas could result in briefly lowered visibilities to well under a mile at times in blowing dust or blowing sand. Use extra caution. && $$
595 WWUS75 KPSR 060556 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 1056 PM MST Fri Jun 5 2020 CAZ563-566-567-060700- /O.EXP.KPSR.WI.Y.0021.000000T0000Z-200606T0600Z/ Salton Sea-Imperial County West-Imperial Valley- Including the cities of Desert Shores, Coolidge Springs, Salton City, Winona, Coyote Wells, Plaster City, El Centro, Calexico, Alamorio, and Brawley 1056 PM PDT Fri Jun 5 2020 ...WIND ADVISORY WILL EXPIRE AT 11 PM PDT THIS EVENING... $$ CAZ562-061300- /O.CON.KPSR.WI.Y.0021.000000T0000Z-200606T1300Z/ Imperial County Southwest- 1056 PM PDT Fri Jun 5 2020 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM PDT SATURDAY... * WHAT...West winds 40 to 50 mph with gusts up to 75 mph. * WHERE...Southwest corner of Imperial County. * WHEN...Until 6 AM PDT Saturday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne. Minor tree damage possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Advisory means that sustained wind speeds of between 30 and 40 mph are expected, or wind gusts of between 40 and 58 mph. Winds this strong can make driving difficult, especially for high profile vehicles. In addition, strong winds over desert areas could result in briefly lowered visibilities to well under a mile at times in blowing dust or blowing sand. Use extra caution. && $$
539 WWUS75 KPSR 060824 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 124 AM MST Sat Jun 6 2020 CAZ562-062300- /O.EXT.KPSR.WI.Y.0021.000000T0000Z-200607T1200Z/ Imperial County Southwest- 124 AM PDT Sat Jun 6 2020 ...WIND ADVISORY NOW IN EFFECT UNTIL 5 AM PDT SUNDAY... * WHAT...West winds 30 to 40 mph with gusts up to 55 mph. * WHERE...Southwest corner of Imperial County. * WHEN...Until 5 AM PDT Sunday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne. Minor tree damage possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Advisory means that sustained wind speeds of between 30 and 40 mph are expected, or wind gusts of between 40 and 58 mph. Winds this strong can make driving difficult, especially for high profile vehicles. In addition, strong winds over desert areas could result in briefly lowered visibilities to well under a mile at times in blowing dust or blowing sand. Use extra caution. && $$
118 WWUS75 KPSR 062137 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 237 PM MST Sat Jun 6 2020 CAZ562-070945- /O.CON.KPSR.WI.Y.0021.000000T0000Z-200607T1200Z/ Imperial County Southwest- 237 PM PDT Sat Jun 6 2020 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 AM PDT SUNDAY... * WHAT...West winds 20 to 30 mph with gusts up to 45 mph. * WHERE...Southwest corner of Imperial County. * WHEN...Until 5 AM PDT Sunday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne. Sudden reductions in visibility will be possible in blowing dust. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Advisory means that sustained wind speeds of between 30 and 40 mph are expected, or wind gusts of between 40 and 58 mph. Winds this strong can make driving difficult, especially for high profile vehicles. In addition, strong winds over desert areas could result in briefly lowered visibilities to well under a mile at times in blowing dust or blowing sand. Use extra caution. && $$
963 WWUS75 KPSR 071131 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 431 AM MST Sun Jun 7 2020 CAZ562-071245- /O.EXP.KPSR.WI.Y.0021.000000T0000Z-200607T1200Z/ Imperial County Southwest- 431 AM PDT Sun Jun 7 2020 ...WIND ADVISORY WILL EXPIRE AT 5 AM PDT EARLY THIS MORNING... $$
Nearby
Wind Advisories in California, 2020Every wind advisory in 2020
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.