Alert archive / Nebraska / Tornado Watches in 2014

Tornado Watch 210

June 3, 20144 states

The Storm Prediction Center issued this tornado watch at Jun 3, 2014, 5:59 PM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 3, 2014, 5:59 PM CDT (22:59 UTC)
Expired
Jun 4, 2014, 1:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
70 kt
All 101 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Cass County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Atchison County, KS, Doniphan County, KS, Johnson County, KS, Leavenworth County, KS, Wyandotte County, KS, Adair County, MO, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Jackson County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Putnam County, MO, Ray County, MO, Schuyler County, MO, Sullivan County, MO, Worth County, MO, Adams County, NE, Blaine County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gage County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Loup County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Washington County, NE, Webster County, NE, Wheeler County, NE, York County, NE

The radar

The Omaha radar (KOAX), 100 km from the middle of the area, began a volume at 23:01 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
70%
One or more EF2 to EF5 tornadoes
50%
Ten or more severe wind reports
95%
One or more gusts of 65 knots or more
80%
Ten or more severe hail reports
95%
One or more hailstones of 2 inches or more
80%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

120 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 3, 6:05 PM CDTSevere Thunderstorm WarningLBFHolt, Wheeler40 min
Jun 3, 6:07 PM CDTSevere Thunderstorm WarningEAXHarrison, Mercer38 min
Jun 3, 6:10 PM CDTSevere Thunderstorm WarningDMXAdams, Ringgold, Taylor, Union65 min
Jun 3, 6:13 PM CDTFlash Flood WarningOAXDouglas, Sarpy6 hr
Jun 3, 6:13 PM CDTSevere Thunderstorm WarningOAXButler, Platte32 min
Jun 3, 6:15 PM CDTSevere Thunderstorm WarningOAXHarrison, Pottawattamie30 min
Jun 3, 6:17 PM CDTSevere Thunderstorm WarningGIDGreeley, Sherman, Valley43 min
Jun 3, 6:20 PM CDTSevere Thunderstorm WarningLBFCuster55 min
Jun 3, 6:23 PM CDTFlash Flood WarningOAXDodge, Washington3 hr
Jun 3, 6:24 PM CDTSevere Thunderstorm WarningEAXGentry, Harrison, Mercer, Nodaway, Worth66 min
Jun 3, 6:28 PM CDTSevere Thunderstorm WarningGIDPolk17 min
Jun 3, 6:30 PM CDTFlash Flood WarningDMXAdair, Adams, Cass, Union6 hr
Jun 3, 6:35 PM CDTSevere Thunderstorm WarningOAXButler, Colfax, Platte, Saunders40 min
Jun 3, 6:37 PM CDTFlash Flood WarningEAXHarrison, Mercer6 hr
Jun 3, 6:41 PM CDTSevere Thunderstorm WarningLBFGarfield, Wheeler49 min
Jun 3, 6:44 PM CDTSevere Thunderstorm WarningOAXMills, Pottawattamie31 min
Jun 3, 6:53 PM CDTSevere Thunderstorm WarningGIDGreeley, Howard, Sherman, Valley67 min
Jun 3, 6:53 PM CDTFlash Flood WarningOAXPlatte6 hr
Jun 3, 6:55 PM CDTSevere Thunderstorm WarningEAXMercer, Putnam, Sullivan50 min
Jun 3, 6:55 PM CDTSevere Thunderstorm WarningOAXAntelope, Boone, Madison, Pierce35 min
Jun 3, 6:56 PM CDTTornado WarningDMXRinggold22 min
Jun 3, 6:57 PM CDTFlash Flood WarningDMXRinggold, Taylor6 hr
Jun 3, 7:01 PM CDTSevere Thunderstorm WarningDMXClarke, Decatur59 min
Jun 3, 7:02 PM CDTSevere Thunderstorm WarningLBFCuster13 min
Jun 3, 7:03 PM CDTFlash Flood WarningOAXBurt, Cuming, Dodge, Washington6 hr
Jun 3, 7:12 PM CDTSevere Thunderstorm WarningGIDBuffalo, Greeley, Hall, Howard, Merrick, Nance and 1 more63 min
Jun 3, 7:12 PM CDTSevere Thunderstorm WarningOAXButler, Lancaster, Saunders33 min
Jun 3, 7:13 PM CDTSevere Thunderstorm WarningLBFCuster47 min
Jun 3, 7:14 PM CDTSevere Thunderstorm WarningDMXRinggold16 min
Jun 3, 7:14 PM CDTSevere Thunderstorm WarningOAXFremont, Mills, Montgomery, Page46 min
Jun 3, 7:21 PM CDTTornado WarningDMXDecatur24 min
Jun 3, 7:26 PM CDTSevere Thunderstorm WarningEAXGrundy, Harrison, Mercer, Putnam, Sullivan49 min
Jun 3, 7:29 PM CDTFlash Flood WarningOAXMontgomery, Page6 hr
Jun 3, 7:30 PM CDTSevere Thunderstorm WarningDMXAdair, Adams, Cass, Taylor60 min
Jun 3, 7:38 PM CDTSevere Thunderstorm WarningGIDHall, Hamilton, Howard, Merrick, Nance, Polk and 1 more67 min
Jun 3, 7:38 PM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Sarpy, Saunders37 min
Jun 3, 7:43 PM CDTSevere Thunderstorm WarningDMXAppanoose, Wayne47 min
Jun 3, 7:45 PM CDTSevere Thunderstorm WarningDMXDecatur, Lucas, Wayne45 min
Jun 3, 7:48 PM CDTSevere Thunderstorm WarningGIDAdams, Buffalo, Clay, Fillmore, Franklin, Hall and 4 more42 min
Jun 3, 7:52 PM CDTFlash Flood WarningDMXDecatur, Wayne6 hr
Jun 3, 7:55 PM CDTSevere Thunderstorm WarningLBFCuster50 min
Jun 3, 7:57 PM CDTSevere Thunderstorm WarningOAXMontgomery, Page19 min
Jun 3, 8:02 PM CDTSevere Thunderstorm WarningOAXButler28 min
Jun 3, 8:04 PM CDTFlash Flood WarningEAXMercer, Putnam, Sullivan12 hr
Jun 3, 8:06 PM CDTSevere Thunderstorm WarningLBFGarfield, Loup39 min
Jun 3, 8:06 PM CDTSevere Thunderstorm WarningOAXCass, Otoe, Sarpy39 min
Jun 3, 8:07 PM CDTSevere Thunderstorm WarningGIDGreeley, Valley38 min
Jun 3, 8:08 PM CDTSevere Thunderstorm WarningDMXAdams, Ringgold, Taylor, Union67 min
Jun 3, 8:11 PM CDTSevere Thunderstorm WarningEAXGrundy, Mercer, Putnam, Sullivan49 min
Jun 3, 8:13 PM CDTSevere Thunderstorm WarningOAXFremont, Mills, Montgomery, Page47 min
Jun 3, 8:17 PM CDTSevere Thunderstorm WarningLBFCuster28 min
Jun 3, 8:19 PM CDTSevere Thunderstorm WarningOAXButler, Colfax, Platte, Seward26 min
Jun 3, 8:26 PM CDTSevere Thunderstorm WarningOAXButler, Lancaster, Saunders, Seward34 min
Jun 3, 8:30 PM CDTTornado WarningDMXAdams, Ringgold, Taylor, Union30 min
Jun 3, 8:32 PM CDTSevere Thunderstorm WarningGIDFillmore, York43 min
Jun 3, 8:36 PM CDTSevere Thunderstorm WarningOAXFremont39 min
Jun 3, 8:41 PM CDTSevere Thunderstorm WarningLBFGarfield, Holt, Wheeler36 min
Jun 3, 8:45 PM CDTSevere Thunderstorm WarningLBFCuster45 min
Jun 3, 8:45 PM CDTSevere Thunderstorm WarningOAXButler, Lancaster, Saline, Saunders, Seward45 min
Jun 3, 8:47 PM CDTSevere Thunderstorm WarningEAXAtchison43 min
Jun 3, 8:47 PM CDTSevere Thunderstorm WarningGIDGreeley, Valley43 min
Jun 3, 8:49 PM CDTSevere Thunderstorm WarningOAXFremont, Montgomery, Page41 min
Jun 3, 8:51 PM CDTTornado WarningDMXRinggold, Union24 min
Jun 3, 8:51 PM CDTSevere Thunderstorm WarningEAXAdair, Linn, Macon, Putnam, Schuyler, Sullivan54 min
Jun 3, 8:57 PM CDTSevere Thunderstorm WarningGIDGreeley, Howard, Sherman, Valley48 min
Jun 3, 9:00 PM CDTFlash Flood WarningEAXAdair, Grundy, Harrison, Mercer, Sullivan11 hr
Jun 3, 9:06 PM CDTSevere Thunderstorm WarningDMXTaylor54 min
Jun 3, 9:06 PM CDTSevere Thunderstorm WarningOAXNemaha24 min
Jun 3, 9:12 PM CDTTornado WarningGIDHoward, Sherman33 min
Jun 3, 9:17 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson, Lancaster, Saline43 min
Jun 3, 9:19 PM CDTSevere Thunderstorm WarningLBFCuster41 min
Jun 3, 9:20 PM CDTFlash Flood WarningEAXAdair, Putnam, Schuyler10 hr
Jun 3, 9:21 PM CDTSevere Thunderstorm WarningDMXClarke, Decatur, Ringgold24 min
Jun 3, 9:23 PM CDTSevere Thunderstorm WarningEAXAndrew, Atchison, Gentry, Holt, Nodaway, Worth37 min
Jun 3, 9:24 PM CDTSevere Thunderstorm WarningOAXPage21 min
Jun 3, 9:26 PM CDTSevere Thunderstorm WarningOAXCass, Johnson, Lancaster, Otoe34 min
Jun 3, 9:27 PM CDTSevere Thunderstorm WarningEAXAdair, Macon48 min
Jun 3, 9:29 PM CDTSevere Thunderstorm WarningGIDMerrick, Nance, Polk46 min
Jun 3, 9:35 PM CDTTornado WarningGIDHoward40 min
Jun 3, 9:43 PM CDTTornado WarningOAXGage, Johnson, Pawnee32 min
Jun 3, 9:45 PM CDTSevere Thunderstorm WarningGIDHoward, Sherman45 min
Jun 3, 9:51 PM CDTSevere Thunderstorm WarningDMXRinggold, Taylor54 min
Jun 3, 9:57 PM CDTSevere Thunderstorm WarningDMXDecatur, Wayne48 min
Jun 3, 9:57 PM CDTSevere Thunderstorm WarningGIDHamilton, Merrick, Nance, Polk48 min
Jun 3, 9:58 PM CDTSevere Thunderstorm WarningEAXDoniphan62 min
Jun 3, 9:59 PM CDTSevere Thunderstorm WarningOAXJohnson, Nemaha, Otoe, Pawnee, Richardson46 min
Jun 3, 10:00 PM CDTSevere Thunderstorm WarningLBFCuster30 min
Jun 3, 10:10 PM CDTTornado WarningDMXDecatur, Wayne35 min
Jun 3, 10:12 PM CDTTornado WarningOAXPawnee, Richardson33 min
Jun 3, 10:13 PM CDTSevere Thunderstorm WarningGIDHamilton, York47 min
Jun 3, 10:20 PM CDTSevere Thunderstorm WarningGIDBuffalo, Hall, Hamilton, Merrick40 min
Jun 3, 10:28 PM CDTSevere Thunderstorm WarningOAXPawnee, Richardson32 min
Jun 3, 10:30 PM CDTSevere Thunderstorm WarningGIDHoward, Sherman45 min
Jun 3, 10:34 PM CDTSevere Thunderstorm WarningEAXGentry, Harrison, Mercer, Worth56 min
Jun 3, 10:44 PM CDTSevere Thunderstorm WarningGIDHamilton, Merrick, Polk28 min
Jun 3, 10:45 PM CDTFlash Flood WarningEAXAndrew, Atchison, DeKalb, Gentry, Grundy, Harrison and 3 more7 hr
Jun 3, 10:50 PM CDTSevere Thunderstorm WarningEAXAndrew, Daviess, DeKalb, Gentry, Holt, Nodaway55 min
Jun 3, 10:53 PM CDTSevere Thunderstorm WarningGIDBuffalo, Hall, Hamilton, Merrick52 min
Jun 3, 10:59 PM CDTSevere Thunderstorm WarningGIDClay, Fillmore, Hamilton, York46 min
Jun 3, 11:03 PM CDTSevere Thunderstorm WarningEAXAtchison, Doniphan57 min
Jun 3, 11:08 PM CDTSevere Thunderstorm WarningOAXSaline, Seward52 min
Jun 3, 11:20 PM CDTSevere Thunderstorm WarningOAXSaline40 min
Jun 3, 11:27 PM CDTSevere Thunderstorm WarningEAXGrundy, Harrison, Mercer48 min
Jun 3, 11:31 PM CDTTornado WarningEAXAtchison, Doniphan29 min
Jun 3, 11:37 PM CDTSevere Thunderstorm WarningEAXAndrew, Buchanan, Caldwell, Clinton, Daviess, DeKalb and 2 more38 min
Jun 3, 11:40 PM CDTTornado WarningEAXDaviess, DeKalb25 min
Jun 3, 11:45 PM CDTSevere Thunderstorm WarningGIDClay, Fillmore, York34 min
Jun 3, 11:55 PM CDTSevere Thunderstorm WarningOAXGage, Johnson, Lancaster, Saline35 min
Jun 3, 11:56 PM CDTSevere Thunderstorm WarningEAXBuchanan, Caldwell, Carroll, Clay, Clinton, Platte and 1 more64 min
Jun 4, 12:01 AM CDTSevere Thunderstorm WarningEAXAtchison, Doniphan29 min
Jun 4, 12:04 AM CDTSevere Thunderstorm WarningOAXJefferson, Saline26 min
Jun 4, 12:11 AM CDTSevere Thunderstorm WarningEAXCaldwell, Carroll, Chariton, Daviess, Grundy, Linn and 2 more49 min
Jun 4, 12:15 AM CDTFlash Flood WarningEAXAtchison, Doniphan4 hr
Jun 4, 12:26 AM CDTSevere Thunderstorm WarningOAXGage, Johnson, Nemaha, Pawnee49 min
Jun 4, 12:27 AM CDTFlash Flood WarningEAXHarrison, Mercer6 hr
Jun 4, 12:29 AM CDTSevere Thunderstorm WarningOAXGage, Jefferson, Saline31 min
Jun 4, 12:36 AM CDTSevere Thunderstorm WarningOAXSaline, Seward24 min
Jun 4, 12:54 AM CDTSevere Thunderstorm WarningEAXAdair, Carroll, Chariton, Linn, Livingston, Macon and 1 more66 min
Jun 4, 12:58 AM CDTSevere Thunderstorm WarningOAXGage, Jefferson, Pawnee29 min
Jun 4, 12:59 AM CDTSevere Thunderstorm WarningEAXCaldwell, Carroll, Clay, Clinton, Jackson, Lafayette and 2 more46 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.0 hours before the alert went out and 100 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.

Skew-T log-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2014-06-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2014-06-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1541 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
235 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

044 
WWUS20 KWNS 032258
SEL0  
SPC WW 032258
IAZ000-MOZ000-NEZ000-040600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 210
NWS STORM PREDICTION CENTER NORMAN OK
600 PM CDT TUE JUN 3 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  SOUTHERN IOWA
  NORTHERN MISSOURI
  CENTRAL AND SOUTHEAST NEBRASKA

* EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 600 PM
  UNTIL 100 AM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES LIKELY WITH A COUPLE INTENSE TORNADOES POSSIBLE
  WIDESPREAD DAMAGING WINDS EXPECTED WITH SCATTERED SIGNIFICANT
    GUSTS TO 80 MPH LIKELY
  WIDESPREAD LARGE HAIL EXPECTED WITH SCATTERED VERY LARGE HAIL
    EVENTS TO 3 INCHES IN DIAMETER LIKELY

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 25 MILES NORTHEAST OF
KIRKSVILLE MISSOURI TO 40 MILES SOUTHWEST OF BROKEN BOW NEBRASKA.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 207...WW 208...WW 209...

DISCUSSION...NUMEROUS INTENSE THUNDERSTORMS ARE TRACKING ACROSS
CENTRAL NEB INTO SOUTHWEST IA AND NORTHWEST MO.  STORMS WILL
MAINTAIN INTENSITY THROUGH THE EVENING AND SPREAD SOUTHEASTWARD
ACROSS THE WATCH AREA.  THE ENVIRONMENT IS VERY FAVORABLE FOR
TORNADOES...AS WELL AS THE DEVELOPMENT OF BOW ECHOES CAPABLE OF
WIDESPREAD DAMAGING WINDS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 29040.


...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 3, 1:12 PM CDTTornado WatchSPCAdair, Adams, Audubon, Carroll, Cass, Clarke and 20 more10 hr
Jun 3, 3:48 PM CDTMesoscale DiscussionSPCAudubon, Cass, Harrison, Monona, Pottawattamie, Shelby87 min
Jun 3, 4:37 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 22 more83 min
Jun 3, 6:08 PM CDTMesoscale DiscussionSPCCheyenne, Grant, Greeley, Hamilton, Kearny, Logan and 9 more2 hr
Jun 3, 12:41 PM CDTMesoscale DiscussionSPCAudrain, Boone, Callaway, Cole, Cooper, Franklin and 14 more3 hr
Jun 3, 3:02 AM CDTMesoscale DiscussionSPCBlaine, Brown, Cherry, Grant, Hooker, Keya Paha and 6 more118 min
Jun 3, 7:00 AM CDTMesoscale DiscussionSPCBlaine, Brown, Garfield, Greeley, Holt, Howard and 6 more2 hr
Jun 3, 9:36 AM CDTSevere Thunderstorm WatchSPCBoyd, Brown, Cherry, Holt, Keya Paha, Rock and 2 more7 hr
Jun 3, 12:07 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Boyd, Brown, Cedar and 15 more83 min
Jun 3, 1:20 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 7 more85 min
Jun 3, 2:37 PM CDTSevere Thunderstorm WatchSPCDawes, Sioux6 hr
Jun 3, 3:11 PM CDTTornado WatchSPCArthur, Box Butte, Cherry, Deuel, Garden, Grant and 10 more7 hr
Jun 3, 4:54 PM CDTMesoscale DiscussionSPCAdams, Blaine, Boone, Buffalo, Butler, Clay and 36 more96 min
Jun 3, 6:40 PM CDTMesoscale DiscussionSPCDawes, Sioux65 min

Nearby

Tornado Watches in Nebraska, 2014Tornado Watches in Missouri, 2014Tornado Watches in Iowa, 2014Every tornado watch in 2014

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.