Alert archive / Colorado / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 124, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 28, 1999, 3:44 PM MDT for Adams County, Colorado. It was in force for 31 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 28, 1999, 3:44 PM MDT (21:44 UTC)
- Expired
- Aug 28, 1999, 4:15 PM MDT
- In force
- 31 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Adams County, CO
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 28, 2:15 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.7 hours before the alert went out and 95 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1080 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 83 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 Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 28, 2:30 PM MDT, 1 hour 14 minutes earlier.
Area forecast discussion, Aug 28, 2:30 PM MDT, 1 hour 14 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>In the hours before
Special weather statement, Aug 28, 11:00 AM MDT, 4 hours 44 minutes before
COZ030-032>050-290600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1100 AM MDT SAT AUG 28 1999 THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS...A BAND OF MONSOONAL MOISTURE FROM MEXICO WILL CONTINUE TO STREAM NORTHWARD ON SOUTH TO SOUTHWESTERLY FLOW ALOFT OVER NORTHEAST AND NORTH CENTRAL COLORADO THROUGH THE AFTERNOON AND EVENING HOURS. RESIDUAL MOISTURE AT LOW LEVELS FROM YESTERDAYS HEAVY RAINS HAS INCREASED OVER THE PLAINS. AN UPPER LEVEL DISTURBANCE WILL AID IN DESTABILIZING THIS VERY MOIST AIR MASS OVER THE AREA. WITH FREEZING LEVELS SLIGHTLY LOWER AND STRONGER WINDS ALOFT PROVIDING MORE SHEAR THAN YESTERDAY THE THREAT OF SEVERE THUNDERSTORMS PRODUCING LARGE HAIL AND DAMAGING WINDS WILL INCREASE. IN ADDITION...WITH THE AMOUNT OF MOISTURE IN THE AIR MASS AT 170 PERCENT OF NORMAL FOR THIS TIME OF YEAR...THE THREAT OF HEAVY THUNDERSTORM RAINFALL WILL CONTINUE TO BE HIGH EVEN THOUGH THE STORMS WILL BE MOVING AT A FASTER RATE OF SPEED. THE THREAT OF THE HEAVY RAIN PRODUCING FLOODING WILL BE INCREASED DUE TO ALREADY SATURATED SOILS. THE THREAT OF DEADLY CLOUD TO GROUND LIGHTNING FROM THESE STORMS WILL CONTINUE TO BE PRESENT. BY MIDDAY SCATTERED SHOWERS AND THUNDERSTORMS WILL FORM OVER THE MOUNTAINS AND EASTERN FOOTHILLS AND MOVE TO THE NORTHEAST OVER THE FRONT RANGE URBAN CORRIDOR AND THE NORTHEASTERN PLAINS DURING THE AFTERNOON AND EVENING. A FEW OF THESE STORMS OVER THE URBAN CORRIDOR AND ON THE PLAINS MAY BE SEVERE...PRODUCING LARGE HAIL AND DAMAGING WINDS. THE STRONGEST THUNDERSTORMS WILL BE CAPABLE OF PRODUCING UP TO 3 INCHES OF RAIN IN AN HOUR. THIS HEAVY AMOUNT OF RAIN WILL CAUSE LOCAL FLOODING OF STREETS...HIGHWAYS AND UNDERPASSES...NORMALLY DRY GULCHES...SMALL CREEKS AND STREAMS AND LOW LYING OR FLOOD PRONE AREAS. THE HEAVY RAIN MAY ALSO TRIGGER MUD AND ROCK SLIDES IN CANYONS AND STEEP TERRAIN. SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON. GARD...WFO BOULDER
Special weather statement, Aug 28, 11:00 AM MDT, 4 hours 44 minutes before
COZ030-032>050-290600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1100 AM MDT SAT AUG 28 1999 THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS...A BAND OF MONSOONAL MOISTURE FROM MEXICO WILL CONTINUE TO STREAM NORTHWARD ON SOUTH TO SOUTHWESTERLY FLOW ALOFT OVER NORTHEAST AND NORTH CENTRAL COLORADO THROUGH THE AFTERNOON AND EVENING HOURS. RESIDUAL MOISTURE AT LOW LEVELS FROM YESTERDAYS HEAVY RAINS HAS INCREASED OVER THE PLAINS. AN UPPER LEVEL DISTURBANCE WILL AID IN DESTABILIZING THIS VERY MOIST AIR MASS OVER THE AREA. WITH FREEZING LEVELS SLIGHTLY LOWER AND STRONGER WINDS ALOFT PROVIDING MORE SHEAR THAN YESTERDAY THE THREAT OF SEVERE THUNDERSTORMS PRODUCING LARGE HAIL AND DAMAGING WINDS WILL INCREASE. IN ADDITION...WITH THE AMOUNT OF MOISTURE IN THE AIR MASS AT 170 PERCENT OF NORMAL FOR THIS TIME OF YEAR...THE THREAT OF HEAVY THUNDERSTORM RAINFALL WILL CONTINUE TO BE HIGH EVEN THOUGH THE STORMS WILL BE MOVING AT A FASTER RATE OF SPEED. THE THREAT OF THE HEAVY RAIN PRODUCING FLOODING WILL BE INCREASED DUE TO ALREADY SATURATED SOILS. THE THREAT OF DEADLY CLOUD TO GROUND LIGHTNING FROM THESE STORMS WILL CONTINUE TO BE PRESENT. BY MIDDAY SCATTERED SHOWERS AND THUNDERSTORMS WILL FORM OVER THE MOUNTAINS AND EASTERN FOOTHILLS AND MOVE TO THE NORTHEAST OVER THE FRONT RANGE URBAN CORRIDOR AND THE NORTHEASTERN PLAINS DURING THE AFTERNOON AND EVENING. A FEW OF THESE STORMS OVER THE URBAN CORRIDOR AND ON THE PLAINS MAY BE SEVERE...PRODUCING LARGE HAIL AND DAMAGING WINDS. THE STRONGEST THUNDERSTORMS WILL BE CAPABLE OF PRODUCING UP TO 3 INCHES OF RAIN IN AN HOUR. THIS HEAVY AMOUNT OF RAIN WILL CAUSE LOCAL FLOODING OF STREETS...HIGHWAYS AND UNDERPASSES...NORMALLY DRY GULCHES...SMALL CREEKS AND STREAMS AND LOW LYING OR FLOOD PRONE AREAS. THE HEAVY RAIN MAY ALSO TRIGGER MUD AND ROCK SLIDES IN CANYONS AND STEEP TERRAIN. SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON. GARD...WFO BOULDER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 1:34 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 26 min |
| Aug 28, 1:57 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Douglas, Elbert | 33 min |
| Aug 28, 2:17 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 28 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 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.