Last update Jul. 1, 2007.

    1998
We only had two actual chase days out of 14 days. we drove from Albany, New York to Denver, Colorado in a big van with 11 people. Dr. H met us at the airport in Denver. It took 32 hours to complete the drive. On day 5 we were under the cap in Nebraska, where we had been for days prior, until cells popped in western south Dakota and traveled eastward. we intercepted through Yankton South Dakota and "walked" into the bears cage, one mile south of a developing f2 tornado shrouded with dust. We saw the Doppler on Wheels just a couple miles away from Spencer, South Dakota. The tornado was one mile wide, producing F4 damage but DOW clocked maximum winds at the low F5 range. Six people died. We ended up running from the tornado as the tornado veered right, putting us relatively in the path of the tornado. We got out only to encounter two other tornadic supercells, one rope tornado and one small wedge, F0 and F1 strength. Then  we got out and watched the flanking line develop, and witnessed a "cap cloud". Quite a first experience, 3 tornadoes in one day on like day 3 of my first chase. Once you see that you cant stop chasing....you always want to see more. Here is a movie clip of the storm that I found from stormstock.com.
The second chase day (day 11) we were in a squall line in Texas. It knocked over a tractor trailer truck, and we saw some neat instability clouds called Kelvin-Helmholtz billows.
Photo courtesy of Kristen Corbosiero

    1999
A severe thunderstorm which can produce hail like this is very cool. That hail was near 3 inches in diameter and turned our truck into a dimpled mess. it was great!
However, the mammatus that I have seen are incredible.

    2000
we went chasing twice this year, once on spring break and then the typical summer outing.
Ever been chased by a severe Haboob ?! courtesy spring break storm chase down in Texas (2000) -> we ran away for hours, and hours after this. wow.

Tom Jr. took this lightning flash, and this double, and then this double flash....i think we were in Kansas...no, seriously, we really were...
But always remember that chasing is dangerous...going 40 mph in 4 wheel drive on a dirt road in pouring rain, not knowing it hadn't rained there in the six weeks prior to right now, resulted in us doing a 360 and ending up in a field. Sorry farmer bob.

    2001
What a chase this was. we saw storms nearly everyday, played a huge amount of car vs car putt putt. Imagine going to play putt putt for 3 hours then to get that "feeling" that it was time, and a phone call from Eyad saying "dude, where are you were on our way to central Kansas" only to reply "dude where right in central Kansas playing putt putt!!" Lets go into chase mode!!!

We encountered an F3 near White Deer, Texas, where we were pelted with hail the size of golf balls. click here for another fixed up pic of the F3. here are two more pictures from this day....this one is a sunset and this one is a nice shot of corpuscular rays illuminating the underside of an anvil and the mammatus that were present. Here are the initial cells that eventually amalgamated into a large supercell along an outflow boundary near the Kansas Oklahoma border. Here is a pieced together panoramic of a nice mesocyclone  in Kansas between Medicine Lodge and Wichita.

    2002
Went after a right split supercell down near Lubbock. Storm formed on a southward moving outflow boundary, but the storm was moving to the NE. The 2nd picture is the rear of this beast and had real gusty winds which destroyed numerous power poles on the road we intercepted this supercell.

    
Some other guys pics of the stuff we saw, have seen.
So I moved to Iowa to marry Kristi (who would kill me if I put her picture here ) and because IOWA is better than Florida, and to be closer to the chase...I got some new pics of some more mammatus, the back side of this storm as it was leaving Ames, and some new towers as this storm was dying. the chase is getting closer and we had some nice towers which got cut off from the pbl around 7pm local time on May 5th, 2002. not too far away was this tiny CU from a row of clouds.
 
Nice shelf in MN.                                                                                                   Nice back sheared anvil in KS (possibly). If I remember correctly the backshear anvil grew in spurts as it is not well defined possibly due to entrainment in the thin cirrus moist layer.

    On May 8th I got some mammatus overhead as an MCS grew up quickly. You might be able to see the rows of mammatus. Here is a pic of some distant clouds....taken out of darkness and frustration.
May 15: more mammatus...and more on the edge of the anvil as a tiny line moved from southwest to northeast through Ames around 240pm.

July 27: a tornado touched down 4 mi south of Fort Dodge, Iowa. This is my view from home of the thunderstorm. during these picture approximately 835-850pm local time, we saw the lightning fade away and the back towers begin to sink. Here are a few pictures:

2003:
Supercell in TX which immediately produced 1 tornado and then was a giant lightning creating beast. Earlier in the day we had chased big hail supercells, one of which did not even have any precip reaching the ground but threw quarter sized hail at our windshield. We encountered hail fog along the way, which if you haven't experienced, is quite interesting.

2004:
7 day chase vacation: 3 high risk days, 2 slight, 5 supercells including an LP in OK off the dryline. Here is 1 tornado pic off to the west. At one point there were as many as 3 tornadoes on the ground near Concordia, KS. Here is the hail this crazy storm produced (keep in mind it is 15-30 minutes after it hit the ground). We also saw a nice mammatus display at the end of the day.
  

2005:
Big Ames tornado on November 12, small tornado over the agronomy building in September. Storms went up on the dryline in Iowa and traveled into central Iowa before becoming tornadic. Olivia's first chase, first successful chase that lasted 15 minutes and amounted to less than 5 miles of travel. Very efficient.

2006:

A few day chases but primarily chased with Tim Samaras. Got a nice back building supercell near Scottsbluff, NE, an awesome gustnado, and a whole lot of shearless or moisture deprived days. Pictures courtesy of P. Skinner, B. Lee, and C. Finley.

convection

supercell!

HP

Another supercell

Crazy looking "feeder" cloud which lasted several hours and exhibited very little motion

2007:

A few day chases in IA.

Here are some chasing tips from the man who knows a whole lot: Chuck Doswell