Alert archive / West Virginia / Flash Flood Warnings in 2026

Flash Flood Warning 233, NWS Charleston, WV

September 21, 20265 counties in West Virginia

NWS Charleston, WV issued this flash flood warning at Sep 21, 2026, 1:01 AM EDT for 5 counties in West Virginia. It was in force for 4 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Sep 21, 2026, 1:01 AM EDT (05:01 UTC)
Expired
Sep 21, 2026, 4:33 AM EDT
In force
4 hr
Issued by
NWS Charleston, WV
Area
Storm-based polygon
Flood severity
None

Counties Calhoun County, WV, Gilmer County, WV, Ritchie County, WV, Roane County, WV, Wirt County, WV

The radar

The Charleston,WV radar (KRLX), 86 km from the middle of the area, began a volume at 04:59 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 was reported inside it

TimeReportWhereRemark
Sep 21, 3:15 AM EDTFLASH FLOOD9 Ene Reedy, WVHigh water reported in the 600 block of Anns Run Rd.
Sep 21, 3:20 AM EDTFLASH FLOOD3 Nw Grantsville, WVHigh water reported on Little Kanawha Hwy.
Sep 21, 3:30 AM EDTFLASH FLOOD3 Ne Arnoldsburg, WVHigh water on South Calhoun Highway.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this flash flood warning; the first came 134 minutes after it went out.

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

Pittsburgh, PA (KPIT), launched 00:00Z, 5.0 hours before the alert went out and 186 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, Pittsburgh, PA at 00:00Z on 2026-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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, Pittsburgh, PA at 00:00Z on 2026-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 square meters per square second.193958Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
561 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-25 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

As transmitted.

615 
WGUS51 KRLX 210501
FFWRLX
WVC013-021-085-087-105-211000-
/O.NEW.KRLX.FF.W.0233.260921T0501Z-260921T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Charleston WV
101 AM EDT Mon Sep 21 2026

The National Weather Service in Charleston has issued a

* Flash Flood Warning for...
  North Central Roane County in central West Virginia...
  Calhoun County in north central West Virginia...
  Southwestern Gilmer County in north central West Virginia...
  Southwestern Ritchie County in northwestern West Virginia...
  Southeastern Wirt County in northwestern West Virginia...

* Until 600 AM EDT.

* At 101 AM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to 1 inch of rain has fallen.
  Additional rainfall amounts up to 1 inch are possible in the warned
  area. Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  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...
  Harrisville, Grantsville, Arnoldsburg, North Bend State Park,
  Cairo, Big Springs, Smithville, Brohard, Munday, Macfarlan, Burnt
  House, Annamoriah, Mount Zion, Creston, Stumptown and Millstone.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Report flooding to the National Weather Service by calling toll free,
800 401 9535, when you can do so safely.

&&

LAT...LON 3891 8129 3893 8130 3898 8124 3925 8119
      3926 8096 3874 8097 3882 8128 3889 8128

FLASH FLOOD...RADAR INDICATED

$$

11
1 follow-up statement
573 
WGUS71 KRLX 210833
FFSRLX

Flash Flood Statement
National Weather Service Charleston WV
433 AM EDT Mon Sep 21 2026

WVC013-021-085-087-105-210843-
/O.CAN.KRLX.FF.W.0233.000000T0000Z-260921T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calhoun WV-Gilmer WV-Ritchie WV-Roane WV-Wirt WV-
433 AM EDT Mon Sep 21 2026

...FLASH FLOOD WARNING IS CANCELLED FOR NORTH CENTRAL ROANE, CALHOUN,
SOUTHWESTERN GILMER, SOUTHWESTERN RITCHIE AND SOUTHEASTERN WIRT
COUNTIES...

The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.

A Flood Watch remains in effect until 1200 PM EDT Monday for portions
of southeast Ohio and West Virginia.

&&

LAT...LON 3891 8129 3893 8130 3898 8124 3925 8119
      3926 8096 3874 8097 3882 8128 3889 8128

$$

11

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 Charleston, WV wrote its last area forecast discussion before this flash flood warning went out at Sep 20, 6:39 PM EDT, 6 hours 22 minutes earlier. Its key messages:

  • 1) Unsettled through much of the work week, with continued potential for flooding and isolated strong to severe thunderstorms.
Area forecast discussion, Sep 20, 6:39 PM EDT, 6 hours 22 minutes before
Area Forecast Discussion
National Weather Service Charleston WV
639 PM EDT Sun Sep 20 2026

.WHAT HAS CHANGED...
Flood Watch has been issued for tonight through Monday morning, when
additional heavy rain is expected to move through the area.

&&

.KEY MESSAGES...
1) Unsettled through much of the work week, with continued
potential for flooding and isolated strong to severe
thunderstorms.

&&

.DISCUSSION...
KEY MESSAGE 1...

Additional rounds of showers and thunderstorms are expected to
move through the area today through Monday night, with most
robust activity occurring in concert with a couple of
shortwaves.

Activity will be isolated to scattered this afternoon, then the next
round of more widespread activity arrives this evening. A Flood
Watch has been issued for southeast Ohio and much of West Virginia,
where heavy downpours could rapidly produce a couple inches of rain
overnight and Monday morning. Locations that already received heavy
rain earlier today will be at greatest risk for flash flooding
overnight. Additional rain on Monday could necessitate an
extension to the Flood Watch. A few strong to severe storms
could also be capable of producing locally strong wind gusts.

From Tuesday through Thursday, the pattern remains unsettled with
additional chances for flooding as an upper trough spirals across
the Middle Ohio Valley towards the east coast. Drier conditions
return late week into the weekend as the system pushes off the
Atlantic Coast.

&&

.AVIATION /00Z MONDAY THROUGH FRIDAY/...

Conditions this evening will generally be VFR, although a few
showers and thunderstorms could briefly cause restrictions.
Showers and thunderstorms may become more numerous later
tonight, but confidence on the location is low. In addition, fog
or low stratus could form at locations where there are enough
breaks in the clouds.

Expect a rising cumulus deck on Monday with more showers and
thunderstorms, especially during the afternoon hours.

FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 00Z TUESDAY...

FORECAST CONFIDENCE: High this evening, then low late tonight
and Monday morning. Medium Monday afternoon.

ALTERNATE SCENARIOS: Timing, location, and intensity of
showers and thunderstorms could vary. Fog/low stratus may or
may not form overnight.

EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:
H = HIGH:   TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW:    TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.

DATE                                                                 MON
UTC 1HRLY       23   00   01   02   03   04   05   06   07   08   09   10
EDT 1HRLY       19   20   21   22   23   00   01   02   03   04   05   06
CRW CONSISTENCY  H    H    H    H    H    H    H    M    L    L    L    L
HTS CONSISTENCY  H    H    H    H    H    H    H    H    H    H    M    M
BKW CONSISTENCY  H    H    H    H    H    H    H    H    M    L    L    L
EKN CONSISTENCY  H    H    H    H    H    M    L    M    M    M    M    L
PKB CONSISTENCY  M    M    M    L    L    L    L    L    L    L    L    L
CKB CONSISTENCY  H    M    M    M    M    L    L    L    L    L    L    L

AFTER 00Z TUESDAY...
IFR conditions possible in showers and storms each day through
mid week.

&&

.RLX WATCHES/WARNINGS/ADVISORIES...
WV...Flood Watch through Monday morning for WVZ006>011-013>020-
     026>032-039-040-517>526.
OH...Flood Watch through Monday morning for OHZ066-067-075-076-
     083>087.
KY...None.
VA...None.

&&

DISCUSSION...20
AVIATION...RPY

In the hours before

Special weather statement, Sep 20, 11:40 PM EDT, 1 hour 21 minutes before
Special Weather Statement
National Weather Service Charleston WV
1140 PM EDT Sun Sep 20 2026

OHZ075-085-086-WVZ007-210415-
Athens OH-Meigs OH-Gallia OH-Mason WV-
1140 PM EDT Sun Sep 20 2026

...STRONG THUNDERSTORMS WILL IMPACT MEIGS...NORTHEASTERN GALLIA...
SOUTHWESTERN ATHENS AND NORTHWESTERN MASON COUNTIES THROUGH 1215 AM
EDT...

At 1140 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Albany to near Rutland to 9 miles northeast of
Rio Grande. Movement was east at 35 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Pomeroy, Albany, Racine, Rutland, New Haven, Mason, Tuppers Plains,
Middleport, Chester, Syracuse, Hartford City, Cheshire, Lakin,
Dyesville, Darwin, Harrisonville, Dexter, Kyger, and Carpenter.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3910 8181 3899 8185 3885 8204 3899 8233
      3906 8225 3914 8225 3921 8227 3928 8226
      3930 8188
TIME...MOT...LOC 0340Z 278DEG 30KT 3920 8218 3913 8216 3905 8217 3898
8226

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

01
Special weather statement, Sep 21, 12:06 AM EDT, 55 minutes before
Special Weather Statement
National Weather Service Charleston WV
1206 AM EDT Mon Sep 21 2026

OHZ085-WVZ007-008-210430-
Meigs OH-Jackson WV-Mason WV-
1206 AM EDT Mon Sep 21 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN MEIGS...NORTHERN
MASON AND NORTHWESTERN JACKSON COUNTIES THROUGH 1230 AM EDT...

At 1206 AM EDT, Doppler radar was tracking a strong thunderstorm near
Mason, or near Pomeroy, moving southeast at 25 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Pomeroy, Racine, Ravenswood, New Haven, Mason, Middleport, Syracuse,
Hartford City, Cheshire, Mount Alto, Lakin, Cottageville, and Letart.

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.

&&

LAT...LON 3898 8171 3876 8187 3891 8213 3893 8211
      3895 8211 3896 8210 3900 8210 3901 8211
      3906 8210
TIME...MOT...LOC 0406Z 304DEG 23KT 3896 8206

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

01
Local storm report, Sep 21, 12:11 AM EDT, 50 minutes before
Preliminary Local Storm Report
National Weather Service Charleston WV
1211 AM EDT Mon Sep 21 2026

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

1204 AM     Flash Flood      6 WNW Mcarthur          39.27N 82.58W
09/21/2026                   Vinton             OH   911 Call Center

            High water reported in the 32800 block of SR
            683. Water is blocking residents from
            exiting their residence.

&&

JP
Local storm report, Sep 21, 12:12 AM EDT, 49 minutes before
Preliminary Local Storm Report
National Weather Service Charleston WV
1212 AM EDT Mon Sep 21 2026

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

1205 AM     Flash Flood      1 ENE Mason             39.02N 82.01W
09/21/2026                   Mason              WV   Dept of Highways

            High water reported in the 1600 block of
            Adamsville Rd.

&&

JP
Special weather statement, Sep 21, 12:20 AM EDT, 41 minutes before
Special Weather Statement
National Weather Service Charleston WV
1220 AM EDT Mon Sep 21 2026

OHZ085-WVZ008-009-017-210445-
Meigs OH-Jackson WV-Wirt WV-Wood WV-
1220 AM EDT Mon Sep 21 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN MEIGS...WEST
CENTRAL WIRT...NORTHEASTERN JACKSON AND SOUTHWESTERN WOOD COUNTIES
THROUGH 1245 AM EDT...

At 1220 AM EDT, Doppler radar was tracking a strong thunderstorm near
Racine, moving southeast at 20 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Forked Run State Park, Chester, and Portland.

This includes Interstate 77 in West Virginia between mile markers 149
and 161.

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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3902 8198 3915 8191 3906 8151 3893 8158
TIME...MOT...LOC 0420Z 294DEG 18KT 3905 8189

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

01
Special weather statement, Sep 21, 12:42 AM EDT, 19 minutes before
Special Weather Statement
National Weather Service Charleston WV
1242 AM EDT Mon Sep 21 2026

WVZ008-009-016-017-210515-
Jackson WV-Roane WV-Wirt WV-Wood WV-
1242 AM EDT Mon Sep 21 2026

...STRONG THUNDERSTORMS WILL IMPACT WIRT...NORTHWESTERN ROANE...
NORTHERN JACKSON AND SOUTHERN WOOD COUNTIES THROUGH 115 AM EDT...

At 1242 AM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Lubeck to near Sandyville to near Ripley.
Movement was east at 35 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Parkersburg, Ripley, Elizabeth, Sandyville, Mineralwells, Lubeck,
Washington, Reedy, Cherry, Peewee, Walker, Palestine, Lucille, Evans,
Freeport, Greencastle, Morristown, Davisville, Rockport, and Leroy.

This includes the following highways...
 Interstate 77 in West Virginia between mile markers 138 and 145, and
between mile markers 151 and 176.
 Route 50 in West Virginia near mile marker 8, and between mile
markers 10 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3930 8137 3901 8128 3884 8150 3880 8185
      3882 8186 3894 8169 3922 8169
TIME...MOT...LOC 0442Z 262DEG 29KT 3916 8163 3895 8162 3886 8175

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

JP

The office that day

Everything else NWS Charleston, WV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 20, 10:45 PM EDTFlash Flood WarningRLXJackson, Mason, Wood6 hr
Sep 20, 11:22 PM EDTFlash Flood WarningRLXJackson, Mason5 hr
Sep 20, 11:33 PM EDTFlash Flood WarningRLXJackson, Wirt, Wood6 hr
Sep 21, 12:06 AM EDTSpecial Weather StatementRLXMason24 min
Sep 21, 12:13 AM EDTFlash Flood WarningRLXWood4 hr
Sep 21, 12:20 AM EDTSpecial Weather StatementRLXJackson25 min
Sep 21, 12:28 AM EDTFlash Flood WarningRLXJackson, Ritchie, Roane, Wirt, Wood5 hr
Sep 21, 12:36 AM EDTSevere Thunderstorm WarningRLXCalhoun, Jackson, Ritchie, Roane, Wirt39 min
Sep 21, 12:42 AM EDTSpecial Weather StatementRLXJackson, Wirt, Wood33 min
Sep 21, 1:10 AM EDTSevere Thunderstorm WarningRLXBraxton, Calhoun, Gilmer50 min
Sep 21, 1:22 AM EDTTornado WarningRLXCalhoun, Gilmer23 min
Sep 21, 1:37 AM EDTFlash Flood WarningRLXCalhoun, Jackson, Roane3 hr
Sep 21, 1:52 AM EDTFlash Flood WarningRLXBraxton, Gilmer, Ritchie3 hr
Sep 21, 2:09 AM EDTSpecial Weather StatementRLXBraxton, Clay, Upshur36 min
Sep 21, 2:35 AM EDTFlash Flood WarningRLXPleasants, Ritchie, Wood106 min
Sep 21, 2:38 AM EDTFlash Flood WarningRLXBraxton, Doddridge, Gilmer, Lewis, Ritchie111 min
Sep 21, 2:48 AM EDTSpecial Weather StatementRLXLewis, Upshur27 min
Sep 21, 4:44 AM EDTAreal Flood WarningRLXJackson, Mason, Wood48 hr
Sep 21, 5:19 AM EDTAreal Flood WarningRLXJackson, Wirt, Wood9 hr
Sep 21, 5:30 AM EDTAreal Flood WarningRLXCalhoun, Jackson, Pleasants, Ritchie, Roane, Wirt and 1 more7 hr
Sep 21, 8:17 AM EDTAreal Flood WarningRLXCalhoun, Gilmer, Ritchie, Roane, Wirt4 hr
Sep 21, 10:19 AM EDTSpecial Weather StatementRLXWood26 min
Sep 21, 10:44 AM EDTSpecial Weather StatementRLXWirt, Wood31 min
Sep 21, 12:30 PM EDTSpecial Weather StatementRLXFayette45 min
Sep 21, 12:43 PM EDTSevere Thunderstorm WarningRLXFayette, Nicholas32 min
Sep 21, 1:02 PM EDTAreal Flood WarningRLXRitchie, Wirt10 hr
Sep 21, 1:45 PM EDTSpecial Weather StatementRLXPocahontas30 min
Sep 21, 3:20 PM EDTSevere Thunderstorm WarningRLXMcDowell25 min
Sep 21, 3:42 PM EDTSevere Thunderstorm WarningRLXMcDowell, Wyoming33 min
Sep 21, 3:52 PM EDTFlash Flood WarningRLXMcDowell, Wyoming3 hr
Sep 21, 4:01 PM EDTSevere Thunderstorm WarningRLXMcDowell29 min
Sep 21, 4:04 PM EDTSpecial Weather StatementRLXWyoming26 min
Sep 21, 4:13 PM EDTSpecial Weather StatementRLXRaleigh32 min
Sep 21, 4:34 PM EDTSevere Thunderstorm WarningRLXFayette, Raleigh26 min
Sep 21, 4:35 PM EDTSevere Thunderstorm WarningRLXFayette25 min
Sep 21, 5:00 PM EDTSevere Thunderstorm WarningRLXRaleigh30 min
Sep 21, 5:08 PM EDTSpecial Weather StatementRLXWebster37 min
Sep 21, 5:39 PM EDTSpecial Weather StatementRLXPocahontas36 min
Sep 21, 5:48 PM EDTTornado WarningRLXWayne16 min
Sep 21, 5:55 PM EDTSevere Thunderstorm WarningRLXWayne35 min
Sep 21, 6:07 PM EDTSevere Thunderstorm WarningRLXPocahontas, Randolph23 min
Sep 21, 6:26 PM EDTSevere Thunderstorm Warning Considerable damage threatRLXCabell, Lincoln, Logan, Wayne34 min
Sep 21, 6:32 PM EDTSpecial Weather StatementRLXPocahontas28 min
Sep 21, 6:40 PM EDTTornado WarningRLXLincoln, Logan, Mingo, Wayne13 min
Sep 21, 6:56 PM EDTSevere Thunderstorm WarningRLXBoone, Lincoln, Logan, Mingo, Wayne34 min
Sep 21, 7:10 PM EDTSpecial Weather StatementRLXRandolph35 min
Sep 21, 7:26 PM EDTSevere Thunderstorm WarningRLXLogan34 min
Sep 21, 7:38 PM EDTFlash Flood WarningRLXBoone, Clay, Fayette, Kanawha, Nicholas2 hr
Sep 21, 7:48 PM EDTSevere Thunderstorm WarningRLXLogan11 min

Nearby

Flash Flood Warnings in West Virginia, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.