Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 19, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at May 15, 2001, 4:30 PM CDT for Cass County, Minnesota. It was in force for 60 min. 3 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 15, 2001, 4:30 PM CDT (21:30 UTC)
- Expired
- May 15, 2001, 5:30 PM CDT
- In force
- 60 min
- Issued by
- NWS Duluth, MN
- Area
- Whole counties
County Cass County, MN
The radar
The Duluth radar (KDLH), 161 km from the middle of the area, began a volume at 21:33 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 15, 5:29 PM CDT | Hail 0.75 | Backus, MN | |
| May 15, 5:34 PM CDT | Hail 1.5 | Pine River, MN | |
| May 15, 5:34 PM CDT | Thunderstorm Wind 60 E | Pine River, MN | Several trees were blown down, and there was damage to a garage. The wind speed is estimated. |
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
International Fa, MN (KINL), launched 12:00Z, 9.5 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 580 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.6
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 15, 2:00 PM CDT, 2 hours 30 minutes earlier.
Area forecast discussion, May 15, 2:00 PM CDT, 2 hours 30 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DULUTH MN 200 PM CDT TUE MAY 15 2001 THE OBVIOUS CONCERN FOR 1ST PD IS PSBLTY OF SVR THIS EVE. SWODY1 HAS DETAILS. IN SHORT...LI/S DECRS TO MINUS 8 OR LESS...DEPENDING ON WHICH CALCULATION IS USED...BY 00Z. CAPES EXCEED 4500 J/KG. INCR IN SFC TEMPS AND DPTS HAS BEEN RETARDED SOMEWHAT BY MRNG ST LYR...BUT THAT IS GONE ENTIRELY IN THE S AND JUST ABOUT GONE IN THE N...ALTHO AC DECK NOW MOVG IN. BIG QUES IS STRENGTH OF THE CAP. ETA/AVN 700 MB TEMPS REMAIN PLUS 8C OR BETTER UNTIL CFROPA THIS EVE...WHICH IS MARGINAL. ETA GRID PT SOUNDINGS SHOW LOLVL INVRN ERODING BY 00Z EXCEPT AT DLH WHICH MAY STAY UNDER THE INFLUENCE OF THE MARINE LYR. ANY SVR STORMS MAY HAVE TO WAIT FOR THE ADDITIONAL LIFT PROVIDED BY THE CFNT TO BREAK THE CAP AND TAKE OFF. ALL-IN-ALL...THE SLGT RISK ISSUED BY SPC SEEMS RSNBL FOR NOW...AND WILL MENTION PSBL SVR IN ZFP. BEYOND THAT...MODELS AGREE QUITE WELL ON A PERIOD OF TEMPORARY RIDGING ON WED BEFORE APPROACH OF NXT SYSTEM WED NGT/THU MRNG...AND DO NOT PLAN MUCH CHG FOR THESE PERIODS. CAA KICKS IN AFT 06Z OR SO BUT IS SHORT LIVED. GUIDANCE LOWS AT OR SLIGHTLY BLO THIS MORNINGS LOWS LOOKS RSNBL. WAA ON WED LIKEWISE WILL BE WK AND SHORT LIVED AHD NXT FNTL BNDRY...BUT FEWER CLDS SHOULD MAKE MID 70S REACHABLE...MAYBE 80 IN SRN TIER...AND THIS IS ALREADY DEPICTED IN CURRENT ZONE SET. .DLH...NONE. ERF
The office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 5:27 PM CDT | Severe Thunderstorm Warning | DLH | Cass, Crow Wing | 63 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2001Every 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.