Alert archive / Michigan / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 103, NWS Northern Indiana
NWS Northern Indiana issued this severe thunderstorm warning at Jul 21, 1999, 8:52 PM EST for Cass County, Saint Joseph County, Michigan. It was in force for 33 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
- Jul 21, 1999, 8:52 PM EST (01:52 UTC)
- Expired
- Jul 21, 1999, 9:25 PM EST
- In force
- 33 min
- Issued by
- NWS Northern Indiana
- Area
- Whole counties
Counties Cass County, MI, Saint Joseph County, MI
The radar
The Northern Indiana radar (KIWX), 62 km from the middle of the area, began a volume at 02:05 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.
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 1.9 hours before the alert went out and 212 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
- 429 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 867 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.8
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 Northern Indiana wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 1:29 PM EST, 7 hours 23 minutes earlier.
Area forecast discussion, Jul 21, 1:29 PM EST, 7 hours 23 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORTHERN INDIANA 129 PM EST WED JUL 21 1999 WDLY SCTD CONVECTION DVLPG THIS AFTN ALG WELL DEFINED OUTFLOW BNDRIES ACRS IND INTO PTNS NW OHIO. MOST DISTINCT BNDRY EXTNDD FROM AROUND PAULDING OH WSW TO NEAR PERU IN...AND CONTD NW INTO N CNTRL IL. THIS BNDRY SHWED UP NICELY ON KLOT 88D ALG WITH A DISTINCT LAKE BREEZE ACRS XTRM NE IL. THESE BNDRIES WILL BE FOCUS OF WDLY SCTD CONVECTION THRU THIS EVNG. MAIN QUESTION IS WHAT POPS TO GO WITH FOR THIS EVNG AND TNGT. STILL NOT OUT OF QUESTION THAT MCC COULD DVLP IN MDT LOW LVL WAA PTTN N AND W OF CWA... SRN WI/XTRM NRN IL WITH SOME HELP FM S/W TOPPING RIDGE. ANY DVLPMT WOULD MOVE ESE ACRS XTRM NE IND INTO NW OH. NEGATIVE FACTOR IS THAT SFC FNT HAS PUSHED NE OF CWA... CLOSE TO A COLDWATER MI-TOL LINE AS OF 18Z. BEST CHC FOR PCPN SHD BE ALG THIS BNDRY. OTHER CONSIDERATION IS WHETHER HEAT ADVISORIES WILL BE NEEDED ACRS AREA THIS WEEK INTO WEEKEND. HAVE DECIDED AGAINST HEADLINE FOR THIS ISSUANCE AS REACHING OVERNIGHT CRITERIA WILL BE MARGINAL. NW SFC FLOW TMRW MAY DROP DEWPOINTS A CPL OF DEGREES WHICH WOULD KEEP AREA OUT OF ADVISORY CRITERIA AGAIN. FWC GUIDANCE TEMPS HAVE BEEN GOOD AND SEE NO REASON TO DEVIATE. SBN GG 073/092 070/093 071 08200 FWA GG 072/093 070/094 071 08200 AOH GG 072/092 069/093 070 08300 .IWX...NONE. JAH
The office that day
Everything else NWS Northern Indiana issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 8:38 PM EST | Severe Thunderstorm Warning | IWX | LaPorte | 47 min |
| Jul 21, 9:37 PM EST | Severe Thunderstorm Warning | IWX | Elkhart, LaGrange | 48 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 1999Every severe thunderstorm warning in 1999
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; radar from the NEXRAD Level II archive.