Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 90, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 25, 1999, 7:42 PM CDT for Rock County, Wisconsin. It was in force for 63 min. 2 reports 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
- Jul 25, 1999, 7:42 PM CDT (00:42 UTC)
- Expired
- Jul 25, 1999, 8:45 PM CDT
- In force
- 63 min
- Issued by
- NWS Milwaukee, WI
- Area
- Whole counties
County Rock County, WI
The radar
The Milwaukee radar (KMKX), 54 km from the middle of the area, began a volume at 00:42 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 |
|---|---|---|---|
| Jul 25, 7:45 PM CDT | Thunderstorm Wind | Edgerton, WI | |
| Jul 25, 8:10 PM CDT | Thunderstorm Wind | Clinton, WI |
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
Davenport, (KDVN), launched 00:00Z, 0.7 hours before the alert went out and 166 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
- 3645 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1476 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 77 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 Milwaukee, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 25, 2:58 PM CDT, 4 hours 44 minutes earlier.
Area forecast discussion, Jul 25, 2:58 PM CDT, 4 hours 44 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 258 PM CDT SUN JUL 25 1999 FCST FOCUS TNGT IS ON SCT TSRA AHD OF FNT. AXIS OF VRY UNSTBL AIR IN ERN MN AND NE IA. LI/S -12 WITH CAPES ARND 6000 AND MSTR CONV. SOME CLDS DVLPG IN THIS RGN. HWVR...VRY DRY AIR ATTM ABV 850 MB. UW AND AVN MODELS DVLP CONVECTION THERE AND MOVE IT INTO SRN WI THIS EVNG. I THINK THE TRIGGER MECH IS MSG... BUT CONVECTION IN CNTRL MN MAY BLD SEWD IN THE UNSTBL AXIS...THEN MOVE EWD. SECOND CHC TSRA TNGT IS WITH S/W AND TROF. CONVECTION DVLPG ALNG AND AHD OF TROF ATTM...HELPED BY S/W PROMINENT ON SAT PICS. PCPN PATTERNS QUITE SIM IN BOTH MODELS. XPCT CONVECTION TO APCH WRN WI THIS EVNG. ISNT INDICTS GD LIFT WITH LLJ INTO WRN WI. TSRA MAY DVLP AHD OF TROF THIS EVNG IN THIS LIFT RGN...SPCLY WHEN CAP RELAXES...THEN DRIFT ACRS SRN WI...MNLY LT EVNG HRS. WL MNTN CHC TSRA MNLY LT TNGT ACRS SRN WI. MAIN ACTION SHD BE W AND NW WITH S/W AND SFC TROF...IF NOTHING DVLPS IN INSTBLTY AXIS W OF AREA. SCT TSRA FOR MON AND TROF AND S/W MOVS ACRS RGN. SHD END BY MID AFTN AS FNT PASSES...AND ISNT MOTION IS STG DNWD. WILL DROP TEMPS WELL BELOW MOS TUE DUE TO CLDS AND SCT TSRA. TIME SECTNS INDICT SIGI MID LVL MSTR AND SAGGING 850 TEMPS. XPCT MID/UPR 80S FOR MAX TMPS. .UWNMS...FOCUSES ON CONVECTION IN INSTBLITY AXIS IN MN AND IA. DVLPS PCPN ALNG TROF BY 00Z. NO PCPN ATTM IN AXIS. MAJOR PCPN ALNG TROF ATTM. .MKX...NONE. MK
The office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 7:29 PM CDT | Severe Thunderstorm Warning | MKX | Dane | 61 min |
| Jul 25, 7:44 PM CDT | Flash Flood Warning | MKX | Dane | 2 hr |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.