Alert archive / North Dakota / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 629

July 25, 2001Carter County, Powder River County, Montana; 5 counties in North Dakota; Butte County, Harding County, Perkins County, South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 25, 2001, 8:30 PM MDT for Carter County, Powder River County, Montana; 5 counties in North Dakota; Butte County, Harding County, Perkins County, South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 25, 2001, 8:30 PM MDT (02:30 UTC)
Expired
Jul 26, 2001, 2:00 AM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Carter County, MT, Powder River County, MT, Adams County, ND, Bowman County, ND, Grant County, ND, Hettinger County, ND, Slope County, ND, Butte County, SD, Harding County, SD, Perkins County, SD

The radar

The Rapid City radar (KUDX), 194 km from the middle of the area, began a volume at 02:21 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 25, 8:34 PM MDTSevere Thunderstorm WarningBISBowman56 min
Jul 25, 8:58 PM MDTSevere Thunderstorm WarningBISSlope62 min
Jul 25, 9:13 PM MDTFlash Flood WarningBISBowman, Golden Valley, Slope6 hr
Jul 25, 9:29 PM MDTSevere Thunderstorm WarningBISBowman61 min

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.5 hours before the alert went out and 196 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, Rapid City, SD at 00:00Z on 2001-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1880 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, Rapid City, SD at 00:00Z on 2001-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 square meters per square second.19395878Sfc1 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
1880 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
542 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
193 m²/s²
Significant tornado parameter
0.8
Supercell composite
5.9

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 26, 3:00 PM MDTSevere Thunderstorm WatchSPCBig Horn, Carter, Custer, Fallon, Musselshell, Powder River and 3 more6 hr
Jul 26, 3:00 PM MDTSevere Thunderstorm WatchSPCDawson, Garfield, McCone, Prairie, Richland, Roosevelt and 2 more6 hr
Jul 25, 6:15 PM MDTTornado WatchSPCBrule, Buffalo, Faulk, Hand, Hughes, Hyde and 8 more5 hr

Nearby

Severe Thunderstorm Watches in North Dakota, 2001Severe Thunderstorm Watches in South Dakota, 2001Severe Thunderstorm Watches in Montana, 2001Every severe thunderstorm watch in 2001

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.