Alert archive / Michigan / Severe Thunderstorm Warnings in 1996
Severe Thunderstorm Warning 89, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 20, 1996, 2:20 PM EDT for Calhoun County, Michigan. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 20, 1996, 2:20 PM EDT (18:20 UTC)
- Expired
- Aug 20, 1996, 2:45 PM EDT
- In force
- 25 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Whole counties
County Calhoun County, MI
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 6.3 hours before the alert went out and 140 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
- 1181 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 824 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Grand Rapids, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 2:57 PM EDT, 23 hours 23 minutes earlier.
Area forecast discussion, Aug 19, 2:57 PM EDT, 23 hours 23 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND RAPIDS MI 250 PM EDT MON AUG 19 1996 KGRR WSR-88D SHOWS FIRST WAVE OF PCPN THAT CROSSED FCST AREA THIS MRNG HAS REACHED E CNTRL AND SERN LWR...W/ A SECOND AREA OF TSRA OVER NWRN LWR FROM LDM NWD. ANOTHER ISOLD CELL HAS RECENTLY POPPED UP ARND GRR IN AREA OF LOW LVL CNVRGC. ALSO WATCHING AREA OF CNVTN OVER ERN IA/WRN IL...WHICH IS MVG INTO AREA OF STG 850MB THETA-E ADVTN...INSTABILITY (ADAP LI`S TO -6)...AND PRES FALLS. CLD TOPS ARE BGNG TO WARM ON INITIAL AREA OF CNVTN...BUT APRS AS IF SOME SOME STMS TRYING TO DVLP ALG OUTFLOW BNDRY OUT AHD OF MAIN PCPN AREA. MDLS ARE POINTING TWD 850MB INFLOW TURNING MORE SWLY THIS EVNG W/INCRSG 850MB MSTR/THETA-E ADVCTN...SO THE POTL IS THERE FOR CNVTN DVLPG OVR SRN WI/NRN IL TO REACH WRN LWR THIS EVNG AND MOVE ACRS FCST AREA. LINGERING INSTABILTY COMBINED W/MSTR CNVRGC/THETA-E ADVCTN/WAA COULD ALSO ALLOW SOME SHRA/TSRA TO DVLP OVRNGT...SO IN ALL THINK SCTD POPS SHUD WORK IN MOST AREAS. ETA/NGM BRING NXT COLD FRONT INTO WRN LWR TUES MRNG ALTHO BEST DYNAMICS LIFT N OF LK SUPERIOR. STILL W/HIGH SFC DWPTS...WK S/WV TROF SWINGING ACRS LWR MI...AND LI`S ARND -4 XPCT SCTD SHRA/TSRA ONCE AGAIN ON TUESDAY...THO PCPN CHCS WILL END FROM W TO E DURNG THE AFTN AS THE FRONT PASSES AND DRIER AIR BGNS TO ADVECT IN. XPCT MORE CLNDS ACRS NWRN 1/2 OF CWA TNGT/TUESDAY AS FLOW BCMS WRLY/SWRLY AND PULLS SOME OF THE LOW CLDS IN FROM WI. MORE SUdNSHINE OVR SERN 1/2 OF CWA SHUD WARM THINGS UP NICELY TUESDAY AFTN. GRR EB 068/082 0154X LAN TB 068/086 0145X BORIS
The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 8:12 PM EDT | Tornado Warning | GRR | Clinton | 63 min |
| Aug 20, 12:32 AM EDT | Severe Thunderstorm Warning | GRR | Osceola | 28 min |
| Aug 20, 4:36 AM EDT | Severe Thunderstorm Warning | GRR | Mecosta, Montcalm, Newaygo | 39 min |
| Aug 20, 1:53 PM EDT | Severe Thunderstorm Warning | GRR | Jackson | 52 min |
| Aug 20, 4:06 PM EDT | Severe Thunderstorm Warning | GRR | Branch, Hillsdale | 54 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 1996Every severe thunderstorm warning in 1996
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.