Alert archive / Michigan / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 36, NWS Marquette, MI
NWS Marquette, MI issued this severe thunderstorm warning at Aug 23, 1998, 10:10 PM EDT for Ontonagon County, Michigan. It was in force for 50 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
- Aug 23, 1998, 10:10 PM EDT (02:10 UTC)
- Expired
- Aug 23, 1998, 11:00 PM EDT
- In force
- 50 min
- Issued by
- NWS Marquette, MI
- Area
- Whole counties
County Ontonagon County, MI
The radar
The Marquette radar (KMQT), 137 km from the middle of the area, began a volume at 02:13 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 23, 10:45 PM EDT | Thunderstorm Wind 50 | Rockland, MI | 18 inch diameter tree down on a van. Tree down across Creek Rroad. |
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, 2.2 hours before the alert went out and 272 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
- 1186 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 1356 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
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 Marquette, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 22, 10:25 PM EDT, 23 hours 45 minutes earlier.
Area forecast discussion, Aug 22, 10:25 PM EDT, 23 hours 45 minutes before
AREA FORECAST DISCUSSION...UPDATE NATIONAL WEATHER SERVICE MARQUETTE MI 1025 PM EDT SUN AUG 22 1998 STRONG TO SEVERE THUNDERSTORMS ARE OCCURRING IN THE TWIN CITIES AND GREEN BAY AREAS. S MN AND S WI HAVE CAPES IN THE 3000 J/KG RANGE. LIS OVER UPPER MI WILL FALL INTO NEGATIVE TERRITORY. GOOD LOW LEVEL THETA E ADVECTION WILL RESULT IN INCREASED INSTABILITY BY DAYBREAK, WI BORDER WILL HAVE LIS OF -4. THE MOST IMPRESSIVE SHEAR WILL BE OVERNIGHT, SO SHEAR AND INSTABILITY WILL BE OUT OF PHASE FOR UPPER MI, ALTHOUGH MSP STORMS DOES NOT HAVE GREAT SHEAR ASSOCIATED WITH IT. A FEW CLAPS OF THUNDER ARE OCCURRING NEAR THE WI BORDER AS RESULT OF MORE INSTABILITY AND THE MORE ISOLATED NATURE OF THE CONVECTION. EXPECT TO CONTINUE TO SEE MORE CONVECTION TO DEVELOP OVERNIGHT ALONG AREA OF CONVERGENCE AT LOW LEVELS. AREA OF CONVERGENCE CURRENTLY OVER THE WESTERN U.P. WILL BE OVER FAR EASTERN U.P. BY 12Z. 12Z WILL SEE A NEARLY PRECIP FREE U.P. THIS WILL ONLY BE RESPITE AS CAPES WILL CONTINUE TO CLIMB DURING THE MORNING HOURS. WILL MENTION SCT -SHRA/TSRA WITH DIMINISHING TREND FROM WEST TO EAST. WITH WET GROUND, FOG WILL RESULT. WILL INTRODUCE AREAS OF FOG TO THE FORECAST. KFM
In the hours before
Local storm report, Aug 23, 7:01 PM EDT, 3 hours 9 minutes before
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</html>Local storm report, Aug 23, 7:01 PM EDT, 3 hours 9 minutes before
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</html>The office that day
Everything else NWS Marquette, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 11:51 PM EDT | Severe Thunderstorm Warning | MQT | Marquette | 49 min |
| Aug 24, 12:28 AM EDT | Severe Thunderstorm Warning | MQT | Alger | 42 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 1998Every severe thunderstorm warning in 1998
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.