Alert archive / Oklahoma / Flash Flood Warnings in 2026

Flash Flood Warning 17, NWS Tulsa, OK

June 3, 2026Tulsa County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Jun 3, 2026, 2:54 AM CDT for Tulsa County, Oklahoma. It was in force for 3 hr. 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 3, 2026, 2:54 AM CDT (07:54 UTC)
Expired
Jun 3, 2026, 6:15 AM CDT
In force
3 hr
Issued by
NWS Tulsa, OK
Area
Storm-based polygon
Flood severity
None

County Tulsa County, OK

The radar

The Tulsa radar (KINX), 42 km from the middle of the area, began a volume at 07:58 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.9 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.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2026-06-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 43 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, Norman, OK at 00:00Z on 2026-06-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -79 square meters per square second.1939Sfc1 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
43 J/kg
Mixed-layer CIN
-300 J/kg
Mixed-layer LCL
1882 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-79 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

600 
WGUS54 KTSA 030754
FFWTSA
OKC143-031115-
/O.NEW.KTSA.FF.W.0017.260603T0754Z-260603T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tulsa OK
254 AM CDT Wed Jun 3 2026

The National Weather Service in Tulsa has issued a

* Flash Flood Warning for...
  Southeastern Tulsa County in northeastern Oklahoma...

* Until 615 AM CDT.

* At 254 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Estimates between 2 and 3 
  inches of rain have fallen. Additional rainfall amounts up to 1.5 
  inches are possible in the warned area. Flash flooding is ongoing 
  or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Tulsa...                           Broken Arrow...
  Bixby...                           Jenks...
  Glenpool...                        Jenks Riverside Airport...
  Leonard...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3591 9576 3593 9603 3594 9603 3597 9603
      3598 9603 3599 9603 3600 9603 3601 9603
      3602 9603 3603 9603 3607 9603 3609 9582

FLASH FLOOD...RADAR INDICATED

$$
2 follow-up statements
955 
WGUS74 KTSA 031010
FFSTSA

Flash Flood Statement
National Weather Service Tulsa OK
510 AM CDT Wed Jun 3 2026

OKC143-031115-
/O.CON.KTSA.FF.W.0017.000000T0000Z-260603T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Tulsa OK-
510 AM CDT Wed Jun 3 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 AM CDT THIS 
MORNING FOR SOUTHEASTERN TULSA COUNTY...

At 510 AM CDT, Doppler radar indicated most of the thunderstorms 
producing heavy rain had moved out of the warned area. Radar 
estimates between 3 and 5 inches of rain have fallen. Flash flooding 
is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
Tulsa...                           Broken Arrow...
Bixby...                           Jenks...
Glenpool...                        Jenks Riverside Airport...
Leonard...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3591 9576 3593 9603 3594 9603 3597 9603
      3598 9603 3599 9603 3600 9603 3601 9603
      3602 9603 3603 9603 3607 9603 3609 9582

FLASH FLOOD...RADAR INDICATED

$$
255 
WGUS74 KTSA 031112
FFSTSA

Flash Flood Statement
National Weather Service Tulsa OK
612 AM CDT Wed Jun 3 2026

OKC143-031122-
/O.EXP.KTSA.FF.W.0017.000000T0000Z-260603T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Tulsa OK-
612 AM CDT Wed Jun 3 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 615 AM CDT THIS MORNING FOR 
SOUTHEASTERN TULSA COUNTY...

The heavy rain has ended at this time. Additional flooding is no 
longer expected to pose a threat. Please continue to heed any road 
closures.

&&

LAT...LON 3591 9576 3593 9603 3594 9603 3597 9603
      3598 9603 3599 9603 3600 9603 3601 9603
      3602 9603 3603 9603 3607 9603 3609 9582

$$

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tulsa, OK wrote its last area forecast discussion before this flash flood warning went out at Jun 3, 12:16 AM CDT, 2 hours 38 minutes earlier. Its key messages:

  • Updated at 1214 AM CDT Wed Jun 3 2026
  • Lower shower and storm chances Wednesday though confidence is low.
  • Unsettled pattern and plentiful moisture return to maintain daily shower and thunderstorm chances beginning Thursday through the weekend and into early next week.
Area forecast discussion, Jun 3, 12:16 AM CDT, 2 hours 38 minutes before
Area Forecast Discussion
National Weather Service Tulsa OK
1216 AM CDT Wed Jun 3 2026

...New AVIATION...

.KEY MESSAGES...
Updated at 1214 AM CDT Wed Jun 3 2026

 - Lower shower and storm chances Wednesday though confidence is
   low.

 - Unsettled pattern and plentiful moisture return to maintain
   daily shower and thunderstorm chances beginning Thursday through
   the weekend and into early next week.

&&

.SHORT TERM...
(Through Wednesday)
Issued at 1155 PM CDT Tue Jun 2 2026

Ongoing convection across E OK and NW AR is primarily being aided
by the slow moving remnant MCV that is drifting southward through
E OK. Drier low level air is attempting to advection westward into
the local region but is making slow progress. While the bulk of
guidance focuses higher rain chances west of the area on Wednesday
the forecast confidence is low and overall coverage by afternoon
by again trend higher. Slow storm motions have allowed for locally
heavy rains and this will remain a concern given the weak
steering flow.

&&

.LONG TERM...
(Wednesday Night through Tuesday)
Issued at 1155 PM CDT Tue Jun 2 2026

A brief lull in rain chances is currently forecast for Wednesday
night before the pattern returns to persistent subtle forcing
within a plume of rich moisture. Mid level trough makes slow
progress across the Plains Thursday into Friday with the southern
extent of this trough drawing an upper low northward across N
Mexico and into far W TX by Saturday. Forcing with the slow moving
trough passage will foster increasing shower and thunderstorm
coverage Thursday through Friday while the aforementioned upper
low lifts northeastward across the region Saturday through Monday.
This pattern evolution coupled with plentiful moisture will
maintain daily shower and thunderstorm chances into early next
week. The overall flow aloft will remain weak and any severe
potential will continue to be isolated and locally heavy rainfall
and flooding concerns will remain the primary concern.

&&

.AVIATION...
(06Z TAFS)
Issued at 1214 AM CDT Wed Jun 3 2026

Scattered showers and thunderstorms remain possible overnight for
all terminals, but are more likely across eastern Oklahoma. Any
storms will be capable of strong gusty winds, heavy rain, and
lightning. These storms will briefly lower visibility and
ceilings, but in general ceilings will remain above 3 kft. A few
additional showers or storms may occur Wednesday afternoon, but
did not include them in the TAFs as the probability is too low to
be specific at this time. Winds will mostly remain light and out
of the east to southeast.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   85  68  85  70 /  20  10  30  30
FSM   86  68  87  69 /   0   0  40  10
MLC   88  69  86  71 /  20  10  40  20
BVO   84  64  85  68 /  20  10  30  30
FYV   84  63  84  68 /   0   0  30  10
BYV   80  61  82  65 /   0   0  20  10
MKO   85  67  85  69 /  20  10  30  20
MIO   84  65  85  68 /  10   0  30  20
F10   85  67  84  68 /  20  10  30  20
HHW   86  70  83  70 /  20  10  50  20

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...None.
AR...None.
&&

SHORT TERM...07
LONG TERM....07
AVIATION...06
Hazardous weather outlook, Jun 2, 9:43 PM CDT, 5 hours 11 minutes before
Hazardous Weather Outlook
National Weather Service Tulsa OK
943 PM CDT Tue Jun 2 2026

ARZ001-002-010-011-119-120-129-219-220-229-OKZ049-053-055>071-
073>075-154-172-176-254-272-276-354-376-032200-
Benton-Carroll-Washington AR-Madison-Northern Crawford-
Northern Franklin-North and Central Sebastian-Southern Crawford-
Central and Southern Franklin-Southern Sebastian-Pushmataha-
Choctaw-Washington OK-Nowata-Craig-Ottawa-Pawnee-Tulsa-Rogers-
Mayes-Delaware-Creek-Okfuskee-Okmulgee-Wagoner-Cherokee-Adair-
Muskogee-McIntosh-Pittsburg-Haskell-Latimer-Western Osage-
Northern Sequoyah-Northern Le Flore-Northeast Osage-
Central and Southern Sequoyah-Central Le Flore-Southeast Osage-
Southern Le Flore-
943 PM CDT Tue Jun 2 2026

This Outlook is for Northwest and West Central Arkansas as well as
much of Eastern Oklahoma.

.DAY ONE...Tonight.

SEVERE THUNDERSTORM.
	RISK...Limited.
	AREA...Eastern Oklahoma.
	ONSET...Ongoing...ending around daybreak Wednesday.

FLASH FLOOD.
	RISK...Limited.
	AREA...Eastern Oklahoma.
	ONSET...Ongoing.

DISCUSSION...

A cluster of storms over northeast Oklahoma will move south this
evening and overnight with a limited damaging wind threat. Other
more isolated storms may develop as well, with very low severe risk.
Slow-moving storms will be capable of dropping locally heavy
rainfall which could lead to isolated flash flooding.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Local Spotter Activation May Be Needed.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.
WEDNESDAY...No Hazards.
THURSDAY through SATURDAY...Thunderstorm Potential.
SUNDAY...Thunderstorm and Heavy Rain Potential.
MONDAY...Thunderstorm Potential.

EXTENDED DISCUSSION...

Storm chances quickly return Thursday and remain forecast through
the weekend from an area of low pressure moving into the Plains.
A heavy rain threat as well as a limited severe risk exists into
the weekend.

weather.gov/tulsa contains additional information.

In the hours before

Special weather statement, Jun 2, 9:46 PM CDT, 5 hours 8 minutes before
Special Weather Statement
National Weather Service Tulsa OK
946 PM CDT Tue Jun 2 2026

OKZ067-068-070-030330-
Muskogee OK-Cherokee OK-Wagoner OK-
946 PM CDT Tue Jun 2 2026

...STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN WAGONER...
SOUTHWESTERN CHEROKEE AND NORTHERN MUSKOGEE COUNTIES THROUGH 1030 PM
CDT...

At 946 PM CDT, Doppler radar indicated strong thunderstorms along a
line extending from 4 miles south of Haskell to 4 miles east of Taft
to 2 miles north of Fort Gibson. Movement was south at 15 mph.

HAZARD...Wind gusts 40 to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down small tree limbs and blow
         around unsecured objects. Minor hail damage to vegetation
         is possible.

Locations in or near the path include...
Muskogee...                       Fort Gibson...
Haskell...                        Okay...
Braggs...                         Taft...
Boynton...                        Tullahassee...
Pumpkin Center...                 Sequoyah State Park...
Wainwright...                     Summit...
Jamesville...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3582 9567 3585 9545 3592 9515 3565 9505
      3558 9546 3561 9571
TIME...MOT...LOC 0246Z 000DEG 12KT 3577 9568 3575 9546 3583 9524

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH
Special weather statement, Jun 2, 10:20 PM CDT, 4 hours 34 minutes before
Special Weather Statement
National Weather Service Tulsa OK
1020 PM CDT Tue Jun 2 2026

OKZ070-071-030345-
Muskogee OK-McIntosh OK-
1020 PM CDT Tue Jun 2 2026

...STRONG THUNDERSTORMS WILL IMPACT NORTHEASTERN MCINTOSH AND CENTRAL
MUSKOGEE COUNTIES THROUGH 1045 PM CDT...

At 1019 PM CDT, Doppler radar indicated strong thunderstorms along a
line extending from 5 miles southeast of Muskogee to 3 miles
northwest of Keefeton to 2 miles northwest of Oktaha. Movement was
south at 25 mph.

HAZARD...Wind gusts up to 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down small tree limbs and blow
         around unsecured objects.

Locations in or near the path include...
Muskogee...                       Fort Gibson...
Checotah...                       Warner...
Webbers Falls...                  Oktaha...
Braggs...                         Rentiesville...
Greenleaf State Park...           Keefeton...
Wainwright...                     Summit...

This includes Interstate 40 in Oklahoma between mile markers 255 and
278.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3568 9558 3572 9538 3581 9523 3570 9512
      3564 9513 3555 9513 3541 9541 3541 9571
TIME...MOT...LOC 0319Z 002DEG 23KT 3569 9530 3561 9539 3561 9551

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
Local storm report, Jun 2, 10:25 PM CDT, 4 hours 29 minutes before
Preliminary Local Storm Report
National Weather Service Tulsa OK
1025 PM CDT Tue Jun 2 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1016 PM     Tstm Wnd Gst     3 E Summit              35.66N 95.37W
06/02/2026  M62 MPH          Muskogee           OK   Official NWS Obs

            KMKO observation.

&&
Special weather statement, Jun 2, 10:51 PM CDT, 4 hours 3 minutes before
Special Weather Statement
National Weather Service Tulsa OK
1051 PM CDT Tue Jun 2 2026

OKZ070-071-074-030430-
Haskell OK-Muskogee OK-McIntosh OK-
1051 PM CDT Tue Jun 2 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN HASKELL...
NORTHEASTERN MCINTOSH AND SOUTHEASTERN MUSKOGEE COUNTIES THROUGH 1130
PM CDT...

At 1051 PM CDT, Doppler radar indicated a strong thunderstorm over
Warner, moving south at 20 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down small tree limbs and blow
         around unsecured objects. Minor hail damage to vegetation
         is possible.

Locations in or near the path include...
Stigler...                        Checotah...
Warner...                         Porum...
Whitefield...                     Oktaha...
Rentiesville...                   Briartown...
Enterprise...                     Keefeton...

This includes Interstate 40 in Oklahoma between mile markers 264 and
283.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3556 9560 3567 9522 3524 9512 3521 9540
TIME...MOT...LOC 0351Z 347DEG 17KT 3551 9532

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH
Special weather statement, Jun 2, 11:41 PM CDT, 3 hours 13 minutes before
Special Weather Statement
National Weather Service Tulsa OK
1141 PM CDT Tue Jun 2 2026

OKZ070-071-073>075-030515-
Haskell OK-Pittsburg OK-Latimer OK-Muskogee OK-McIntosh OK-
1141 PM CDT Tue Jun 2 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN HASKELL...EAST
CENTRAL MCINTOSH...NORTHERN LATIMER...NORTHEASTERN PITTSBURG AND
SOUTHEASTERN MUSKOGEE COUNTIES THROUGH 1215 AM CDT...

At 1140 PM CDT, Doppler radar indicated a strong thunderstorm 3 miles
east of Enterprise, moving south at 20 mph.

HAZARD...Wind gusts up to 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down small tree limbs and blow
         around unsecured objects.

Locations in or near the path include...
Stigler...                        Quinton...
Porum...                          Whitefield...
Kinta...                          Briartown...
Enterprise...                     Blocker...
Lequire...                        Featherston...
Lewisville...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3500 9557 3539 9557 3541 9519 3503 9496
TIME...MOT...LOC 0440Z 338DEG 17KT 3524 9531

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
Special weather statement, Jun 3, 2:18 AM CDT, 36 minutes before
Special Weather Statement
National Weather Service Tulsa OK
218 AM CDT Wed Jun 3 2026

OKZ060-030745-
Tulsa OK-
218 AM CDT Wed Jun 3 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN TULSA COUNTY
THROUGH 245 AM CDT...

At 218 AM CDT, Doppler radar indicated a strong thunderstorm 3 miles
north of Bixby, moving west at 10 mph.

HAZARD...Wind gusts up to 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down small tree limbs and blow
         around unsecured objects.

Locations in or near the path include...
Tulsa...                          Broken Arrow...
Bixby...                          Jenks...
Glenpool...                       Jenks Riverside Airport...

This includes Interstate 44 between mile markers 219 and 224.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3610 9603 3608 9579 3590 9582 3592 9603
TIME...MOT...LOC 0718Z 102DEG 8KT 3600 9591

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 2, 7:09 PM CDTSpecial Weather StatementTSADelaware36 min
Jun 2, 7:31 PM CDTSpecial Weather StatementTSAMayes44 min
Jun 2, 8:13 PM CDTSpecial Weather StatementTSARogers32 min
Jun 2, 8:22 PM CDTSpecial Weather StatementTSAWagoner38 min
Jun 2, 8:32 PM CDTSpecial Weather StatementTSATulsa, Wagoner43 min
Jun 2, 9:00 PM CDTAreal Flood AdvisoryTSACherokee3 hr
Jun 2, 9:05 PM CDTSpecial Weather StatementTSAWagoner40 min
Jun 2, 9:10 PM CDTAreal Flood AdvisoryTSAWagoner3 hr
Jun 2, 9:46 PM CDTSpecial Weather StatementTSAMuskogee44 min
Jun 2, 10:20 PM CDTSpecial Weather StatementTSAMuskogee25 min
Jun 2, 10:25 PM CDTSevere Thunderstorm WarningTSAMcIntosh, Muskogee27 min
Jun 2, 10:29 PM CDTAreal Flood AdvisoryTSACherokee, Muskogee, Wagoner3 hr
Jun 2, 10:38 PM CDTFlash Flood WarningTSAMuskogee3 hr
Jun 2, 10:51 PM CDTSpecial Weather StatementTSAMuskogee39 min
Jun 2, 11:17 PM CDTAreal Flood AdvisoryTSAHaskell, McIntosh, Muskogee3 hr
Jun 2, 11:28 PM CDTFlash Flood WarningTSAHaskell, McIntosh, Muskogee3 hr
Jun 2, 11:41 PM CDTSpecial Weather StatementTSAHaskell34 min
Jun 3, 12:39 AM CDTAreal Flood AdvisoryTSAAdair, Cherokee, Delaware, Mayes3 hr
Jun 3, 2:08 AM CDTAreal Flood AdvisoryTSATulsa3 hr
Jun 3, 2:18 AM CDTSpecial Weather StatementTSATulsa27 min
Jun 3, 3:20 AM CDTAreal Flood AdvisoryTSACreek, Osage, Tulsa3 hr

Nearby

Flash Flood Warnings in Oklahoma, 2026Every flash flood warning in 2026

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.