Alert archive / Minnesota / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 709

September 6, 200110 counties in Minnesota; Cass County, Traill County, North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Sep 6, 2001, 3:45 PM CDT for 10 counties in Minnesota; Cass County, Traill County, North Dakota. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Sep 6, 2001, 3:45 PM CDT (20:45 UTC)
Expired
Sep 6, 2001, 8:00 PM CDT
In force
4 hr
Issued by
the Storm Prediction Center

Counties Clay County, MN, Clearwater County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Cass County, ND, Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 56 km from the middle of the area, began a volume at 20:48 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

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

IssuedProductOfficeCountiesLasted
Sep 6, 4:18 PM CDTSevere Thunderstorm WarningFGFPolk, Red Lake42 min
Sep 6, 4:30 PM CDTSevere Thunderstorm WarningFGFTraill30 min
Sep 6, 5:01 PM CDTSevere Thunderstorm WarningFGFPolk, Red Lake59 min
Sep 6, 5:45 PM CDTSevere Thunderstorm WarningFGFTraill45 min
Sep 6, 6:17 PM CDTSevere Thunderstorm WarningFGFCass28 min
Sep 6, 7:17 PM CDTFlash Flood WarningFGFCass6 hr

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 8.8 hours before the alert went out and 268 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, International Fa, MN at 12:00Z on 2001-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 668 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, International Fa, MN at 12:00Z on 2001-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 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
668 J/kg
Mixed-layer CIN
-275 J/kg
Mixed-layer LCL
923 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

Nearby

Severe Thunderstorm Watches in Minnesota, 2001Severe Thunderstorm Watches in North Dakota, 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.