Alert archive / Indiana / Special Marine Warnings in 2021
Special Marine Warning 21, NWS Northern Indiana
NWS Northern Indiana issued this special marine warning at Aug 24, 2021, 9:23 PM EDT. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 24, 2021, 9:23 PM EDT (01:23 UTC)
- Expired
- Aug 24, 2021, 10:30 PM EDT
- In force
- 67 min
- Issued by
- NWS Northern Indiana
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 34.0 mph
The radar
The Northern Indiana radar (KIWX), 107 km from the middle of the area, began a volume at 01:27 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
Lincoln, IL (KILX), launched 00:00Z, 1.4 hours before the alert went out and 247 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
- 2737 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1274 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.3
The text
As transmitted.
023
WHUS53 KIWX 250123
SMWIWX
LMZ043-046-080-250230-
/O.NEW.KIWX.MA.W.0021.210825T0123Z-210825T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Northern Indiana
923 PM EDT Tue Aug 24 2021
The National Weather Service in Northern Indiana has issued a
* Special Marine Warning for...
Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to
mid-line of lake....
Michigan City IN to New Buffalo MI...
New Buffalo MI to St Joseph MI...
Nearshore and open waters from Michigan City IN to St. Joseph MI...
* Until 1030 PM EDT.
* At 922 PM EDT, a strong thunderstorm was located near New Buffalo,
or 7 nm north of Michigan City, moving northeast at 20 knots.
HAZARD...Wind gusts 34 knots or greater.
SOURCE...Radar.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
* Locations impacted include...
New Buffalo, St. Joseph and Michigan City.
LAT...LON 4172 8691 4179 8696 4179 8697 4212 8696
4213 8657 4211 8649 4206 8650 4190 8657
4178 8673 4172 8690
TIME...MOT...LOC 0122Z 237DEG 21KT 4183 8681
HAIL...0.00IN
WIND...>34KTS
$$
RTCThe office that day
Everything else NWS Northern Indiana issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 8:29 PM EDT | Severe Thunderstorm Warning | IWX | LaPorte, Saint Joseph | 46 min |
| Aug 24, 8:33 PM EDT | Special Marine Warning | IWX | 57 min | |
| Aug 24, 9:02 PM EDT | Severe Thunderstorm Warning | IWX | Elkhart, Saint Joseph | 43 min |
| Aug 24, 9:57 PM EDT | Special Weather Statement | IWX | LaGrange | 33 min |
| Aug 24, 10:20 PM EDT | Special Weather Statement | IWX | LaGrange | 25 min |
| Aug 24, 10:24 PM EDT | Special Weather Statement | IWX | LaPorte, Starke | 66 min |
| Aug 25, 6:26 PM EDT | Special Weather Statement | IWX | White | 34 min |
| Aug 24, 8:14 PM EDT | Areal Flood Advisory | IWX | Berrien, Cass | 3 hr |
| Aug 24, 8:30 PM EDT | Severe Thunderstorm Warning | IWX | Cass | 30 min |
| Aug 24, 9:40 PM EDT | Special Weather Statement | IWX | Branch | 35 min |
Nearby
Special Marine Warnings in Indiana, 2021Every special marine warning in 2021
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.