Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS Quad Cities, IA

June 19, 2021Clark County, Scotland County, Missouri; Lee County, Van Buren County, Iowa; Hancock County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 19, 2021, 4:33 AM CDT for Clark County, Scotland County, Missouri; Lee County, Van Buren County, Iowa; Hancock County, Illinois. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 19, 2021, 4:33 AM CDT (09:33 UTC)
Expired
Jun 19, 2021, 5:30 AM CDT
In force
57 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.5 in
Wind
50.0 mph

Counties Lee County, IA, Van Buren County, IA, Hancock County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 168 km from the middle of the area, began a volume at 09:33 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 18, 10:08 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 9.6 hours before the alert went out and 173 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, Davenport, at 00:00Z on 2021-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 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, Davenport, at 00:00Z on 2021-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 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
4 J/kg
Mixed-layer CIN
-335 J/kg
Mixed-layer LCL
2572 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

946 
WUUS53 KDVN 190933
SVRDVN
ILC067-IAC111-177-MOC045-199-191030-
/O.NEW.KDVN.SV.W.0015.210619T0933Z-210619T1030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
433 AM CDT Sat Jun 19 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Western Hancock County in west central Illinois...
  Southwestern Van Buren County in southeastern Iowa...
  Southwestern Lee County in southeastern Iowa...
  Scotland County in northeastern Missouri...
  Clark County in northeastern Missouri...

* Until 530 AM CDT.

* At 432 AM CDT, a severe thunderstorm was located 8 miles northeast
  of Downing, or 8 miles northwest of Memphis, moving east at 55 mph.

  HAZARD...Ping pong ball size hail.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect 
           damage to roofs, siding, windows, and vehicles.

* This severe thunderstorm will be near...
  Granger around 450 AM CDT.

Other locations in the path of this severe thunderstorm include
Luray, Kahoka, Croton, Wayland, St. Francisville, New Boston, Keokuk,
Nauvoo, Warsaw, Montrose and Hamilton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4039 9235 4060 9234 4060 9218 4065 9218
      4054 9127 4020 9130
TIME...MOT...LOC 0932Z 278DEG 49KT 4057 9226 

HAIL...1.50IN
WIND...<50MPH
 
$$

Ervin
10 follow-up statements
927 
WWUS53 KDVN 190942
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
442 AM CDT Sat Jun 19 2021

ILC067-IAC111-177-MOC045-199-191030-
/O.CON.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
442 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR WESTERN HANCOCK...SOUTHWESTERN VAN BUREN...SOUTHWESTERN LEE...
SCOTLAND AND CLARK COUNTIES...

At 441 AM CDT, a severe thunderstorm was located 7 miles northwest of
Memphis, moving east at 35 mph.

HAZARD...Golf ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

This severe storm will be near...
  Memphis around 450 AM CDT.

Other locations in the path of this severe thunderstorm include
Granger, Wyaconda, Luray, Kahoka, Wayland and St. Francisville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4039 9235 4060 9234 4060 9218 4065 9218
      4054 9127 4020 9130
TIME...MOT...LOC 0941Z 284DEG 26KT 4055 9223 

HAIL...1.75IN
WIND...<50MPH
 
$$

Ervin
983 
WWUS53 KDVN 190953
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
453 AM CDT Sat Jun 19 2021

ILC067-IAC111-177-MOC045-199-191030-
/O.CON.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
453 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR WESTERN HANCOCK...SOUTHWESTERN VAN BUREN...SOUTHWESTERN LEE...
SCOTLAND AND CLARK COUNTIES...

At 453 AM CDT, a severe thunderstorm was located near Memphis, moving
east at 40 mph.

HAZARD...Tennis ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

Locations impacted include...
  Granger, Wyaconda, Luray, Kahoka, Wayland and St. Francisville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4039 9235 4060 9234 4060 9218 4065 9218
      4054 9127 4020 9130
TIME...MOT...LOC 0953Z 283DEG 34KT 4052 9208 

HAIL...2.50IN
WIND...<50MPH
 
$$

Ervin
877 
WWUS53 KDVN 190957
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
457 AM CDT Sat Jun 19 2021

ILC067-IAC111-177-MOC045-199-191030-
/O.CON.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
457 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR WESTERN HANCOCK...SOUTHWESTERN VAN BUREN...SOUTHWESTERN LEE...
SCOTLAND AND CLARK COUNTIES...

At 457 AM CDT, a severe thunderstorm was located over Granger, or 10
miles east of Memphis, moving east at 50 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

This severe storm will be near...
  Wyaconda and Luray around 505 AM CDT.

Other locations in the path of this severe thunderstorm include
Kahoka, Wayland, St. Francisville, Keokuk, Hamilton, Warsaw and
Alexandria.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4039 9235 4060 9234 4060 9218 4065 9218
      4054 9127 4020 9130
TIME...MOT...LOC 0957Z 287DEG 45KT 4049 9197 

HAIL...1.50IN
WIND...<50MPH
 
$$

Ervin
816 
WWUS53 KDVN 191000
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
500 AM CDT Sat Jun 19 2021

ILC067-IAC111-177-MOC045-199-191030-
/O.CON.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
500 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR WESTERN HANCOCK...SOUTHWESTERN VAN BUREN...SOUTHWESTERN LEE...
SCOTLAND AND CLARK COUNTIES...

At 500 AM CDT, a severe thunderstorm was located over Luray, or 8
miles west of Kahoka, moving southeast at 60 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

This severe storm will be near...
  Kahoka around 510 AM CDT.
  Wayland and St. Francisville around 515 AM CDT.

Other locations in the path of this severe thunderstorm include
Warsaw and Alexandria.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4039 9235 4060 9234 4060 9218 4065 9218
      4054 9127 4020 9130
TIME...MOT...LOC 1000Z 292DEG 52KT 4044 9188 

HAIL...1.50IN
WIND...<50MPH
 
$$

Ervin
095 
WWUS53 KDVN 191006
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
506 AM CDT Sat Jun 19 2021

ILC067-IAC111-177-MOC045-199-191030-
/O.CON.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
506 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR WESTERN HANCOCK...SOUTHWESTERN VAN BUREN...SOUTHWESTERN LEE...
SCOTLAND AND CLARK COUNTIES...

At 505 AM CDT, a severe thunderstorm was located near Kahoka, moving
southeast at 60 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe storm will be near...
  Wayland and St. Francisville around 515 AM CDT.

Other locations in the path of this severe thunderstorm include
Warsaw and Alexandria.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4039 9235 4060 9234 4060 9218 4065 9218
      4054 9127 4020 9130
TIME...MOT...LOC 1005Z 292DEG 52KT 4041 9179 

HAIL...1.00IN
WIND...<50MPH
 
$$

Ervin
162 
WWUS53 KDVN 191009
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
509 AM CDT Sat Jun 19 2021

ILC067-IAC111-177-MOC045-199-191030-
/O.CON.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
509 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR SOUTHWESTERN HANCOCK...SOUTHWESTERN VAN BUREN...SOUTHWESTERN
LEE...SCOTLAND AND CLARK COUNTIES...

At 508 AM CDT, a severe thunderstorm was located over Kahoka, moving
southeast at 60 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe storm will be near...
  Wayland and St. Francisville around 515 AM CDT.
  Warsaw and Alexandria around 525 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4032 9196 4052 9234 4060 9234 4060 9218
      4065 9218 4044 9128 4020 9130
TIME...MOT...LOC 1008Z 292DEG 52KT 4039 9173 

HAIL...1.00IN
WIND...<50MPH
 
$$

Ervin
312 
WWUS53 KDVN 191013
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
513 AM CDT Sat Jun 19 2021

ILC067-IAC111-177-MOC045-199-191030-
/O.CON.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
513 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR SOUTHWESTERN HANCOCK...SOUTHWESTERN VAN BUREN...SOUTH CENTRAL
LEE...NORTHEASTERN SCOTLAND AND CLARK COUNTIES...

At 513 AM CDT, a severe thunderstorm was located near Wayland, or
near Kahoka, moving southeast at 60 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe storm will be near...
  Warsaw and Alexandria around 525 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4032 9196 4052 9234 4060 9234 4060 9218
      4065 9218 4037 9129 4020 9130
TIME...MOT...LOC 1013Z 292DEG 52KT 4037 9166 

HAIL...1.00IN
WIND...<50MPH
 
$$

Ervin
389 
WWUS53 KDVN 191018
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
518 AM CDT Sat Jun 19 2021

ILC067-IAC111-177-MOC045-199-191030-
/O.CON.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
518 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR SOUTHWESTERN HANCOCK...SOUTHWESTERN VAN BUREN...SOUTH CENTRAL
LEE...NORTHEASTERN SCOTLAND AND CLARK COUNTIES...

At 518 AM CDT, a severe thunderstorm was located near Kahoka, moving
east at 55 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe storm will be near...
  Warsaw and Alexandria around 530 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4030 9184 4049 9216 4060 9231 4060 9218
      4065 9218 4037 9129 4020 9130
TIME...MOT...LOC 1018Z 291DEG 46KT 4036 9168 

HAIL...1.00IN
WIND...<50MPH
 
$$

Ervin
135 
WWUS53 KDVN 191020
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
520 AM CDT Sat Jun 19 2021

ILC067-IAC111-177-MOC045-199-191030-
/O.CON.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
520 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM CDT
FOR SOUTHWESTERN HANCOCK...SOUTHWESTERN VAN BUREN...SOUTH CENTRAL
LEE...NORTHEASTERN SCOTLAND AND CLARK COUNTIES...

At 520 AM CDT, a severe thunderstorm was located near Wayland, or
near Kahoka, moving southeast at 50 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe storm will be near...
  Alexandria around 530 AM CDT.
  Warsaw around 535 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4030 9184 4049 9216 4060 9231 4060 9218
      4065 9218 4037 9129 4020 9130
TIME...MOT...LOC 1020Z 292DEG 42KT 4035 9166 

HAIL...1.00IN
WIND...<50MPH
 
$$

Ervin
829 
WWUS53 KDVN 191025
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
525 AM CDT Sat Jun 19 2021

IAC111-177-ILC067-MOC045-199-191035-
/O.EXP.KDVN.SV.W.0015.000000T0000Z-210619T1030Z/
Hancock IL-Van Buren IA-Lee IA-Scotland MO-Clark MO-
525 AM CDT Sat Jun 19 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HANCOCK...
SOUTHWESTERN VAN BUREN...SOUTH CENTRAL LEE...NORTHEASTERN SCOTLAND
AND CLARK COUNTIES WILL EXPIRE AT 530 AM CDT...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning will be allowed to expire.  However small 
hail and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 600 AM CDT for
west central Illinois...southeastern Iowa...and northeastern
Missouri.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
the Quad Cities.

LAT...LON 4023 9151 4024 9151 4025 9150 4025 9160
      4030 9184 4049 9216 4060 9231 4060 9218
      4065 9218 4037 9129 4020 9130
TIME...MOT...LOC 1025Z 278DEG 49KT 4034 9158 

$$

Ervin

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 19, 1:08 AM CDTSevere Thunderstorm WarningDVNClark, Scotland49 min
Jun 19, 4:17 AM CDTSpecial Weather StatementDVNClark28 min
Jun 19, 4:23 AM CDTSpecial Weather StatementDVNClark37 min
Jun 18, 10:17 PM CDTSevere Thunderstorm WarningDVNDes Moines, Henry, Louisa, Washington58 min
Jun 18, 11:03 PM CDTSevere Thunderstorm WarningDVNDes Moines27 min
Jun 18, 11:21 PM CDTSevere Thunderstorm WarningDVNHenry, Jefferson39 min
Jun 18, 11:29 PM CDTSevere Thunderstorm WarningDVNDes Moines, Henry, Louisa46 min
Jun 18, 11:47 PM CDTSevere Thunderstorm WarningDVNLouisa, Washington29 min
Jun 19, 12:02 AM CDTSevere Thunderstorm WarningDVNKeokuk, Washington43 min
Jun 19, 12:12 AM CDTSevere Thunderstorm WarningDVNJefferson, Keokuk, Van Buren, Washington48 min
Jun 19, 12:27 AM CDTSevere Thunderstorm WarningDVNDes Moines, Louisa27 min
Jun 19, 1:28 AM CDTSpecial Weather StatementDVNLouisa2 hr
Jun 19, 2:01 AM CDTSpecial Weather StatementDVNLee, Van Buren59 min
Jun 18, 10:45 PM CDTSevere Thunderstorm WarningDVNHenderson, Mercer, Warren48 min
Jun 18, 11:02 PM CDTSevere Thunderstorm WarningDVNHenderson, Warren43 min
Jun 18, 11:36 PM CDTSevere Thunderstorm WarningDVNHenderson, Warren40 min
Jun 19, 2:27 AM CDTSpecial Weather StatementDVNMcDonough33 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2021Severe Thunderstorm Warnings in Iowa, 2021Severe Thunderstorm Warnings in Illinois, 2021Every severe thunderstorm warning 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.