Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 116, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at Jul 31, 2002, 11:47 PM CDT for Cass County, Itasca County, Minnesota. It was in force for 58 min. 1 report 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
- Jul 31, 2002, 11:47 PM CDT (04:47 UTC)
- Expired
- Aug 1, 2002, 12:45 AM CDT
- In force
- 58 min
- Issued by
- NWS Duluth, MN
- Area
- Whole counties
Counties Cass County, MN, Itasca County, MN
The radar
The Duluth radar (KDLH), 141 km from the middle of the area, began a volume at 04:48 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 1, 12:10 AM CDT | Hail 0.75 | Deer River, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 31, 10:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
International Fa, MN (KINL), launched 00:00Z, 4.8 hours before the alert went out and 157 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
- 1707 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1366 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
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 Jul 31, 9:07 PM CDT, 2 hours 40 minutes earlier.
Area forecast discussion, Jul 31, 9:07 PM CDT, 2 hours 40 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DULUTH MN 907 PM CDT WED JUL 31 2002 FORECAST FOCUS TONIGHT IS THUNDERSTORM DEVELOPMENT AND SEVERITY. COMPLEX OF SEVERE STORMS MOVING THROUGH EASTERN NORTH DAKOTA INTO NORTHWEST MINNESOTA THIS EVENING...SHOULD ENTER OUR WESTERN ZONES IN A COUPLE HOURS. STRONG COLD FRONT AND VORT MAX PROVIDING LIFT OVER VERY UNSTABLE AIRMASS. BOTH INL AND MPX SOUNDINGS SHOW A CAP... BUT INCREASING LIFT SHOULD OVERCOME THAT. UNMODIFIED CAPE VALUES ARE 2125 J/KG OFF INL SOUNDING AND 4577 J/KG AT MPX. 850MB JET INCREASING THIS EVENING AS WELL. WDL PROFILER UP TO 30KT AND 18Z ETA VERIFYING ON THIS. 45 TO 55 KT 850MB FLOW TO DEVELOP AFTER 06Z... AND SHOULD AID IN THUNDERSTORM DEVELOPMENT. I/VE INCREASE POPS MOST ZONES TONIGHT AND MADE FEW OTHER ADJUSTMENTS. .DLH...NONE. MELDE
The office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 12:50 AM CDT | Severe Thunderstorm Warning | DLH | Cass, Itasca, Saint Louis | 70 min |
| Aug 1, 1:00 AM CDT | Flash Flood Warning | DLH | Aitkin, Cass, Itasca | 3 hr |
| Aug 1, 1:08 AM CDT | Flash Flood Warning | DLH | Aitkin, Cass, Itasca | 3 hr |
| Aug 1, 1:53 AM CDT | Severe Thunderstorm Warning | DLH | Saint Louis | 52 min |
| Aug 1, 2:17 AM CDT | Severe Thunderstorm Warning | DLH | Carlton, Lake | 73 min |
| Aug 1, 2:48 AM CDT | Severe Thunderstorm Warning | DLH | Saint Louis | 27 min |
| Aug 1, 3:08 AM CDT | Special Marine Warning | DLH | 2 hr | |
| Aug 1, 3:56 AM CDT | Special Marine Warning | DLH | 49 min | |
| Aug 1, 3:56 AM CDT | Special Marine Warning | DLH | 49 min | |
| Aug 1, 3:56 AM CDT | Special Marine Warning | DLH | 49 min | |
| Aug 1, 3:56 AM CDT | Special Marine Warning | DLH | 49 min | |
| Aug 1, 3:32 AM CDT | Severe Thunderstorm Warning | DLH | Ashland, Bayfield, Douglas | 73 min |
| Aug 1, 4:00 AM CDT | Severe Thunderstorm Warning | DLH | Iron | 60 min |
| Aug 1, 8:01 AM CDT | Severe Thunderstorm Warning | DLH | Price | 59 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2002Every severe thunderstorm warning in 2002
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.