Alert archive / Michigan / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 21, NWS Marquette, MI
NWS Marquette, MI issued this severe thunderstorm warning at Jul 17, 1997, 2:56 AM EDT for Houghton County, Keweenaw County, Michigan. It was in force for 44 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
- Jul 17, 1997, 2:56 AM EDT (06:56 UTC)
- Expired
- Jul 17, 1997, 3:40 AM EDT
- In force
- 44 min
- Issued by
- NWS Marquette, MI
- Area
- Whole counties
Counties Houghton County, MI, Keweenaw County, MI
The radar
The Marquette radar (KMQT), 95 km from the middle of the area, began a volume at 06:55 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 |
|---|---|---|---|
| Jul 17, 3:15 AM EDT | Thunderstorm Wind 55 | Lake Linden, MI | Several trees and power lines downed. |
| Jul 17, 3:20 AM EDT | Thunderstorm Wind 55 | Calumet, MI | Several trees downed up to 12 inches in diameter. |
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
Green Bay/Straub, WI (KGRB), launched 00:00Z, 6.9 hours before the alert went out and 297 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
- 536 J/kg
- Mixed-layer CIN
- -290 J/kg
- Mixed-layer LCL
- 2104 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 171 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMQT 170655 RRA SVRMQT MIC061-083-170740- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MARQUETTE MI 256 AM EDT THU JUL 17 1997 * SEVERE THUNDERSTORM WARNING FOR KEWEENAW COUNTY - NORTHWESTERN UPPER MICHIGAN NORTHERN HOUGHTON COUNTY - NORTHWESTERN UPPER MICHIGAN * UNTIL 340 AM EDT * SOME LOCATIONS AFFECTED HOUGHTON/HANCOCK CALUMET EAGLE RIVER LAKE LINDEN * AT 253 AM EDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER LAKE SUPERIOR 15 MILES NORTHWEST AT CALUMET. THE STORM WAS MOVING SOUTHEAST AT 50 MPH. LARGE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH ARE LIKELY WITH THIS STORM. * THE STORM WILL BE NEAR CALUMET AT 305 AM. STAY *INDOORS AND AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE... SEEK SHELTER IN A STRONG BUILDING. DERNER
The office that day
Everything else NWS Marquette, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 3:51 AM EDT | Severe Thunderstorm Warning | MQT | Baraga | 59 min |
| Jul 17, 4:08 AM EDT | Severe Thunderstorm Warning | MQT | Marquette | 62 min |
| Jul 17, 5:18 AM EDT | Severe Thunderstorm Warning | MQT | Alger | 47 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 1997Every severe thunderstorm warning in 1997
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.