Alert archive / Michigan / Severe Thunderstorm Watches in 1999
Severe Thunderstorm Watch 607
The Storm Prediction Center issued this severe thunderstorm watch at Jul 29, 1999, 8:00 AM EDT for 22 counties in Michigan. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 1999, 8:00 AM EDT (12:00 UTC)
- Expired
- Jul 29, 1999, 12:00 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 22 counties
Alpena County, MI, Antrim County, MI, Arenac County, MI, Charlevoix County, MI, Cheboygan County, MI, Clare County, MI, Crawford County, MI, Emmet County, MI, Gladwin County, MI, Grand Traverse County, MI, Iosco County, MI, Kalkaska County, MI, Lake County, MI, Missaukee County, MI, Montmorency County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Presque Isle County, MI, Roscommon County, MI, Wexford County, MI
The radar
The NCL Michigan radar (KAPX), 16 km from the middle of the area, began a volume at 12:01 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
Alpena, MI (KAPX), launched 12:00Z, 0.0 hours before the alert went out and 198 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1638 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 212 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
276 WWUS9 KMKC 291130 SEL7 MKC WW 291130 MIZ000-LMZ000-LHZ000-291600- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 607 STORM PREDICTION CENTER NORMAN OK 730 AM EDT THU JUL 29 1999 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN LOWER MICHIGAN EASTERN LAKE MICHIGAN WESTERN LAKE HURON EFFECTIVE THIS THURSDAY MORNING FROM 800 AM UNTIL NOON EDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 65 STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES WEST NORTHWEST OF TRAVERSE CITY MICHIGAN TO 10 MILES NORTH NORTHEAST OF OSCODA MICHIGAN. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. OTHER WATCH INFORMATION... CONTINUE...WW 605...WW 606... DISCUSSION...STRONG LOW LEVEL WARM ADVECTION AND SHORTWAVE TROUGH MOVING THROUGH NRN WI WILL RESULT IN A LINE OF SEVERE THUNDERSTORMS TO MOVE RAPIDLY EAST-SOUTHEASTWARD ACROSS NRN LOWER MICHIGAN. LARGE HAIL WILL BE THE MAIN THREAT...BUT DESPITE THE RELATIVELY COOL STABLE BOUNDARY LAYER...DAMAGING WINDS ARE ALSO POSSIBLE GIVEN THE STRONG FORCING AND STRONG WINDS ALOFT. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 29045. ...IMY 454,0855 453,0830 433,0833 435,0861
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 6:00 AM EDT | Severe Thunderstorm Watch | SPC | Alger, Baraga, Delta, Dickinson, Iron, Marquette and 1 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Michigan, 1999Every severe thunderstorm watch 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.