Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 7, NWS Duluth, MN

May 9, 2001Pine County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at May 9, 2001, 7:04 PM CDT for Pine County, Minnesota. It was in force for 41 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 9, 2001, 7:04 PM CDT (00:04 UTC)
Expired: May 9, 2001, 7:45 PM CDT
In force: 41 min
Issued by: NWS Duluth, MN
Area: Whole counties

County Pine County, MN

The radar

The Duluth radar (KDLH), 89 km from the middle of the area, began a volume at 00:07 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

Time	Report	Where	Remark
May 9, 7:30 PM CDT	Hail 1.75	Pine City, MN
May 9, 7:30 PM CDT	Hail 1	Beroun, MN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.1 hours before the alert went out and 156 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1211 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1740 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 368 m²/s²
0-3 km storm-relative helicity: 795 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 8.0

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.

What forecasters said that day

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

NWS Duluth, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at May 9, 2:30 PM CDT, 4 hours 34 minutes earlier.

Area forecast discussion, May 9, 2:30 PM CDT, 4 hours 34 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
230 PM CDT WED MAY 9 2001

MAIN ISSUE FOR THIS FCST CYCLE IS PSBLTY OF TSTMS IN 1ST PD AND
WHETHER OR NOT THEY WILL BE SEVERE. SFC DEW PTS ACRS CWA INCRSG
SOMEWHAT...XCPT FOR ARROWHEAD...AND WHAT MID LVL MSTR THERE IS IS
MAINLY S OF CWA JUST S OF BROAD 300 MB JET. ON THE WHOLE...MSTR WILL
REMAIN SCARCE WITH GLF MEX CLOSED OFF. SLY 850 MB WINDS MODERATELY
STG...BUT AGN RELATIVELY DRY. 850 MB RH INCREASES TO 80 PCT BY 00Z
DUE MAINLY TO UVV. MAIN DIFF BTWN MODELS IS THAT MAX INSTABILITY
FIELDS EXTEND FARTHER N ON AVN THAN ON ETA. FAVORING ETA IN
THIS...WITH MOST SVR TSTM ACTVTY REMAINING S OF OUR CWA CLOSER TO
HIGHER SFC DPTS AND GREATER UVV...WITH SFC BNDRY ACTING AS THE
TRIGGER LATE THIS AFTN AND EVE. SEE LATEST SWODY1 FOR DETAILS. ISOLD
SVR TSTMS STILL A PSBLTY HWVR...ESPCLY ACRS SRN TIER OF ZONES...AND
WILL NOTE THIS IN NEW ZONE SET. WOULD XPCT SOME TSTMS OR SHRA
LINGERING INTO THU MRNG WITH CFNT PASSING DLH ARND 12Z...THEN DECRSG
CLDS. NOT A LOT OF DIFF IN MOS LOWS FOR TNGT...BUT LRG SPREAD FOR
THU/S HIGHS...DUE MAINLY TO DIFFERENCES IN CLD FCST BTWN NGM AND
AVN. WITH CLDS HANGING IN AT LEAST THRU THE MRNG HRS AND MODERATE
CAA MOST OF THU...WILL FAVOR COOLER MAV...BUT NOT AS COOL AS FAN.

.DLH...NONE.

ERF

The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 7:44 PM CDT	Severe Thunderstorm Warning	DLH	Pine	61 min
May 9, 7:57 PM CDT	Tornado Warning	DLH	Pine	48 min
May 9, 8:44 PM CDT	Severe Thunderstorm Warning	DLH	Pine	46 min
May 9, 8:55 PM CDT	Tornado Warning	DLH	Pine	50 min
May 9, 8:12 PM CDT	Severe Thunderstorm Warning	DLH	Burnett, Washburn	63 min
May 9, 9:05 PM CDT	Tornado Warning	DLH	Burnett	55 min
May 9, 9:19 PM CDT	Severe Thunderstorm Warning	DLH	Washburn	56 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2001 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.